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ICL7106EPL+ - 3.5-Digit LCD ADC | Maxim Integrated
ICL7106EPL+

ICL7106EPL+ - 3.5-Digit LCD ADC | Maxim Integrated

The Maxim Integrated ICL7106EPL+ is a monolithic 3.5-digit analog-to-digital converter designed to measure low-frequency differential or single-ended inputs and drive a nonmultiplexed liquid-crystal display. It integrates a voltage reference, clock circuit, polarity and digit drivers, segment decoders, and the functions required for direct LCD operation. The device is packaged as a 40-pin PDIP, with industrial-temperature ordering indicated by the E suffix. The + suffix identifies the manufacturer's lead-free product designation. The ICL7106 family is intended for instrumentation applications where a dedicated display, digital measurement, and relatively low power are more important than high conversion speed. An analog-to-digital converter, or ADC, converts a continuously varying analog voltage into a numeric value. A 3.5-digit integrating ADC such as the ICL7106 uses an integrating measurement approach and includes display decoding and drive circuitry, reducing the external component count required for a standalone panel meter. The ICL7106 differs from the related ICL7107 by driving a nonmultiplexed LCD, while the ICL7107 is intended for LED-display applications. This distinction makes display type an essential PCB and firmware-independent hardware selection criterion. The principal system-level benefits are integration and measurement simplicity. A high-input-impedance measurement front end allows the converter to work with sensor and instrumentation circuits without adding a separate display driver. On-board segment decoders, polarity and digit drivers, a voltage reference, and a clock eliminate several discrete functions from the meter design. These characteristics are especially useful in standalone laboratory instruments, temperature controllers, weighing indicators, process monitors, and service equipment where the analog input must appear directly as a readable numerical measurement. Because the ICL7106 is intended for low-power measurement rather than high-speed waveform acquisition, system timing and input conditioning determine practical performance. The input network, reference arrangement, integration period, clock source, and bypass components should follow the manufacturer's application guidance. Decoupling must be placed close to the supply and reference pins, while the analog input path should avoid long traces and sources of leakage. The LCD interface and converter functions are integrated, but the display still requires the appropriate glass connections and suitable common and segment drive arrangement. Typical applications include digital panel meters, temperature measurement instruments, laboratory readouts, industrial process indicators, portable measurement equipment, and equipment with an integrated numeric display. In these systems, the ICL7106EPL+ serves as both the measurement engine and the LCD interface. Designers should confirm the input range, reference voltage, conversion timing, display configuration, and supply requirements against the manufacturer datasheet before finalizing the analog front end and printed-circuit-board layout. For PCB design, begin by assigning the 40-pin PDIP footprint and checking the manufacturer's pin-description table for analog inputs, reference connections, supply rails, ground pins, clock connections, and LCD outputs. Avoid routing LCD segment and digit lines next to high-impedance analog inputs. Place input and bypass capacitors close to their associated pins, provide a stable ground return, and keep the analog and display paths physically separated where the board area permits. This product page combines the manufacturer's family-level technical description, package and ordering information, related 40-pin device data, application engineering guidance, and a replacement-focused comparison. It is intended to help engineers determine whether the ICL7106EPL+ matches the required display technology, package, lifecycle requirement, and instrumentation architecture before committing the design to production.

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ICL7106IP - 3.5-Digit LCD A/D Converter | Analog Devices
ICL7106IP

ICL7106IP - 3.5-Digit LCD A/D Converter | Analog Devices

The Analog Devices ICL7106IP is a low-power, 3.5-digit successive-approximation A/D converter with integrated seven-segment decoders, LCD display drivers, reference, and clock circuitry in a 40-pin PDIP package. The converter is designed for liquid-crystal displays and uses dual-slope conversion to provide stable measurements in instrument and industrial environments. An A/D converter is an analog-to-digital converter that transforms a continuously varying voltage or current-derived signal into a numeric representation. The ICL7106 belongs to the display-oriented A/D converter hierarchy, combining measurement conversion, display decoding, display drive, reference voltage, and timing functions in one device. Its integrated LCD backplane drive is intended to reduce the external circuitry required for panel instruments. Key features of the ICL7106 include 3.5-digit resolution, seven-segment display decoding, LCD display-driver capability, an integrated reference, an integrated clock, true differential input and reference support, and dual-slope conversion. The device family is designed to reject interference signals common in industrial environments, while ratiometric measurement support is useful for ohms and bridge-transducer applications. The ICL7106 uses dual-slope conversion rather than a high-speed successive-approximation architecture. This approach integrates an input over a fixed measurement interval and compares the resulting charge with a reference-derived ramp. The architecture is well suited to panel meters, digital scales, temperature indicators, and other systems where measurement rate is less important than stable displayed readings and straightforward system integration. Typical applications include digital panel meters, resistance measurement instruments, bridge-sensor instrumentation, industrial process displays, laboratory meters, weighing systems, and portable measurement equipment. The LCD-focused ICL7106 is generally preferable to LED-display converter variants when the design uses a multiplexed liquid-crystal panel. Designers should follow the manufacturer datasheet for the exact pin assignments, reference connections, clock requirements, display timing, and input common-mode limits. The 40-pin PDIP footprint also requires sufficient board space, careful decoupling, and routing that separates sensitive analog input and reference paths from display-drive and digital timing nodes. This page consolidates manufacturer information, distributor availability, pricing context, package identification, and design guidance for engineers evaluating the ICL7106IP in new or replacement LCD instrument designs.

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ICL7106IPL 3.5-Digit LCD A/D Converter | Maxim
ICL7106IPL

ICL7106IPL 3.5-Digit LCD A/D Converter | Maxim

The Maxim ICL7106IPL is a low-power 3 1/2-digit analog-to-digital converter designed for direct liquid-crystal display interfacing. It integrates the converter, seven-segment decoders, display drivers, voltage reference, and clock circuitry in one device, reducing the external component count required for a standalone measurement instrument. The ICL7106 is associated with the Intersil ICL7106 and ICL7107 family of high-performance, low-power display A/D converters. An ADC converts an analog voltage into a digital numerical representation. In the ICL7106, the conversion result is intended for a multiplexed LCD rather than a directly driven LED instrument display. The integration of the display drivers and reference circuit makes the device suitable for digital panel meters, laboratory instruments, handheld meters, weighing systems, and other equipment where a stable numeric readout is required. The principal function of the ICL7106IPL is measurement conversion combined with display control. Its 3 1/2-digit format is designed for applications where a signed or otherwise bounded numerical range is sufficient. The device includes polarity and digit drivers, segment decoders, a voltage reference, and a clock circuit, allowing the measurement system to operate without separate display-driver circuitry. The ICL7106 architecture uses a successive integration conversion technique associated with this family of low-power metering ICs. This approach is suited to relatively slow measurements where low power, good linearity, and display integration are more important than high sampling rates. The converter’s high input impedance helps reduce loading of the signal source, while the integrated reference supports repeatable measurement results when paired with appropriate external input, reference, and display networks. The ICL7106 family is commonly associated with digital voltmeters, current meters, panel meters, laboratory measurement equipment, and embedded instrumentation. A typical design provides the analog input to the converter, uses external components to set the measurement range and reference, and connects the converter to a multiplexed LCD. The ICL7106 variant is particularly appropriate when the display is an LCD; ICL7107 is generally identified with LED-display applications. When designing a circuit around ICL7106IPL, verify the package pinout and display interface against the manufacturer datasheet before assigning PCB tracks. Input filtering, reference decoupling, display glass compatibility, and the external component values for range and timing determine practical measurement performance. Because the available manufacturer page confirms the family function but does not state the complete ICL7106IPL electrical limits in the retrieved material, check the current datasheet for operating voltage, conversion timing, input range, and absolute maximum ratings. This product page combines the confirmed ICL7106 family architecture, the available official product-page information, and clearly identified cross-reference candidates. The comparison and selection notes emphasize package and pin compatibility, while the application guidance focuses on practical use of a low-power 3 1/2-digit LCD measurement system.

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ICL7107CDL - 3.5 Digit Display ADC | Harris | 40-SBDIP
ICL7107CDL

ICL7107CDL - 3.5 Digit Display ADC | Harris | 40-SBDIP

Harris Corporation ICL7107CDL is a 3.5-digit CMOS analog-to-digital converter designed for panel-meter and digital-display applications. The device combines a 40-pin SBDIP package with a 6 V supply indication and is specifically associated with LED display drivers. Its measurement architecture is intended to produce stable, readable results from low-level analog inputs while driving multiplexed seven-segment displays. An ADC such as the ICL7107CDL is a mixed-signal integrated circuit that converts an analog voltage into a numeric value. In the broader hierarchy, it belongs to data-converter ICs, analog-to-digital converters, and display-oriented measurement ICs. The ICL7107 family is commonly used where a panel meter, digital voltmeter, counter, or process-monitoring instrument needs to present an electrical measurement directly through a seven-segment display. The key application feature of the ICL7107CDL is its integrated 3.5-digit conversion and display-driver function. A 3.5-digit meter can display a full range of digits plus one sign or half-digit indication, making it suitable for positive or negative measurements. The 40-SBDIP through-hole package supports conventional PCB mounting, socket assembly, and repair or replacement of older instrument designs. The verified product listing identifies the device as a 40-SBDIP Harris Corporation part. The ICL7107CDL is associated with LED display drivers, which makes it appropriate for digital voltmeters, bench instruments, industrial panel meters, laboratory equipment, and embedded measurement panels. Its external connection requirements, reference voltage, input range, timing behavior, and display-drive characteristics must be confirmed against the manufacturer datasheet before a new PCB is laid out. The device should not be selected solely from its display-driver description because sensor excitation, reference accuracy, input filtering, and calibration determine the final measurement performance. For an instrument design, place the converter close enough to the analog input and reference network to minimize pickup on high-impedance nodes. Use a stable reference arrangement, appropriate input filtering, and decoupling near the supply pins. A conventional through-hole layout should preserve the manufacturer's pin numbering and provide adequate board spacing for the 40-pin SBDIP body. Verify the exact display-driver outputs and segment/common-anode or common-cathode requirements against the target display. This product page combines the Harris and Intersil documentation references, verified distributor identification, package information, application positioning, and engineering guidance. It distinguishes the ICL7107CDL from broader cross-reference candidates by focusing on the 40-pin SBDIP footprint and the practical requirements of 3.5-digit panel-meter designs rather than presenting a generic ADC overview.

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ICL7107CMH+ - 3.5-Digit Dual-Slope ADC | Analog Devices
ICL7107CMH+

ICL7107CMH+ - 3.5-Digit Dual-Slope ADC | Analog Devices

The Analog Devices ICL7107CMH+ is a production 3.5-digit dual-slope analog-to-digital converter designed for precision measurement and digital panel-meter applications. It uses a true differential input and differential reference, provides seven-segment LED display outputs, and is packaged in a 44-pin MQFP measuring 10 mm by 10 mm. The converter combines integration-based measurement with LED display drive circuitry in one device. An ADC converts an analog voltage into a numeric value for measurement, control, or display. The ICL7107 belongs to the dual-slope ADC family, where an unknown input voltage is compared with a reference through integrated and de-integrated phases. This measurement technique is especially useful for slow-moving signals from sensors, resistive transducers, and laboratory instruments because its averaging behavior helps reject periodic interference present in industrial environments. Its architecture also supports ratiometric measurements in which the result depends on the ratio of input voltage to reference voltage. The primary features of the ICL7107CMH+ include its 3.5-digit conversion format, dual-slope conversion technique, true differential analog input, true differential reference input, and direct LED display drive. The integrated display outputs reduce the component count required for common digital panel meters. The zero-integrator phase described for the ICL7106 and ICL7107 family allows the integrator to return to a defined state between measurement cycles, supporting repeatable operation in successive conversion cycles. Its operating limits, conversion time, input ranges, and reference requirements must be confirmed from the manufacturer datasheet for the selected system implementation. The ICL7107 is intended for instrumentation rather than high-speed waveform acquisition. Dual-slope conversion prioritizes resolution and rejection of common interference over conversion speed, making it suitable for panel meters, laboratory measurement equipment, process monitoring, weighing systems, and temperature or bridge-based instrumentation. Differential measurement also helps reject common-mode voltage when the source and return paths are arranged carefully, provided the input common-mode range and reference limits are respected. Common implementations place the ICL7107CMH+ between a sensor or bridge and a seven-segment display. The analog input is conditioned before entering the converter, while the reference and common terminals establish the measurement range. External timing, reference, and display components must follow the recommended application circuit. Care is required when routing the analog input and reference nets because long traces and high-impedance nodes can increase noise pickup, and the LED display driver outputs should not be confused with the analog measurement pins. Designers should confirm the exact pin function for every connection using the pin-description table in the Analog Devices datasheet. The 10 mm by 10 mm MQFP footprint requires a land pattern with adequate thermal and solder-joint area, while the analog input and reference routing should be kept away from display-driver and switching-node traces. When replacing another display ADC, verify not only the conversion resolution but also input range, reference topology, display-drive capability, package dimensions, pin assignment, and conversion timing. This page combines the manufacturer product information, package identification, family-level operating characteristics, qualified same-package order variants, and practical implementation guidance. It also highlights the measurements that must be checked before substitution, helping engineers distinguish genuine pin-compatible options from parts that merely share the same conversion category or display function.

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ICL7107CPL+ - 3.5-Digit Display ADC | Maxim Integrated
ICL7107CPL+

ICL7107CPL+ - 3.5-Digit Display ADC | Maxim Integrated

Maxim Integrated ICL7107CPL+ is a monolithic 3.5-digit analog-to-digital converter with an integrated seven-segment decoder, display driver, voltage reference, and clock circuit. It performs approximately 3 samples per second and is specified in a 40-pin PDIP package. The device is designed for direct seven-segment LED display output and provides high input impedance without requiring external display-drive circuitry. An analog-to-digital converter, or ADC, converts an analog input voltage into a digital value that can be processed, displayed, or transmitted. The ICL7107CPL+ belongs to the broader ADC > data-converter > semiconductor hierarchy. Its integrated dual-slope conversion system is intended for instrumentation applications where moderate resolution, low component count, and direct display output are more important than high-speed sampling. The ICL7107CPL+ includes polarity and digit drivers, segment decoders, an internal voltage reference, and a clock circuit. According to the Analog Devices product page, the dual-slope conversion technique automatically rejects interference signals commonly encountered in industrial environments. True differential input and reference connections also support ratiometric measurements such as resistance and bridge-transducer measurements. The ICL7107CPL+ supports approximately 3 samples per second and includes a zero-integrator phase that improves settling behavior. Its integrated display interface reduces the number of external components needed for a complete measurement panel. The 40-pin PDIP package is suitable for through-hole industrial, laboratory, educational, and legacy control equipment where a large DIP footprint and direct LED display connection are practical. Typical uses include digital panel meters, laboratory voltmeters, temperature indicators, process monitoring instruments, and low-speed sensor interfaces. Because the converter is display-oriented rather than a high-speed sampling ADC, it is most appropriate for continuously updated numerical measurements rather than waveform acquisition, communication receivers, or precision automation channels. A successful design must provide suitable input, reference, and supply bypassing while following the manufacturer’s recommended component values and timing arrangement. LED displays impose load-dependent supply current, so the power source and decoupling should be checked at minimum operating voltage and maximum digit current. For a substitute, verify the complete 40-pin assignment, LED versus LCD output type, reference behavior, sampling interval, and timing before approving a drop-in replacement. This page combines the verified product, distributor, and cross-reference information with a drop-in-focused comparison, practical design guidance, and explicit data gaps. It highlights where published sources confirm package and function and where engineers must consult the detailed datasheet before production substitution.

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ICL7109CMH+ - 12-Bit Dual-Slope ADC, 44-MQFP | Maxim Integrated
ICL7109CMH+

ICL7109CMH+ - 12-Bit Dual-Slope ADC, 44-MQFP | Maxim Integrated

The Maxim Integrated ICL7109CMH+ is a 12-bit plus sign, monolithic CMOS dual-slope integrating Analog-to-Digital Converter (ADC) housed in a 44-pin Metric Quad Flat Pack (MQFP) package, commercial temperature grade. It integrates the reference, oscillator, high-accuracy comparator, bypass switches, and I/O latches required for a complete 12-bit ADC, requiring only a handful of external passive components plus an AC reference or crystal to form a full precision conversion system. Differential inputs, true differential reference inputs, and a built-in +5V reference reduce external analog conditioning needs. A dual-slope integrating ADC is a type of data converter that integrates an input voltage over a fixed time, then de-integrates against a known reference and counts clock pulses to derive a digital result. The architecture provides excellent 50 Hz/60 Hz normal-mode rejection, inherent zero-drift, and monotonic 12-bit performance, making this category a workhorse for digital panel meters, weighing scales, and process instrumentation where linearity and noise immunity matter more than throughput. Key features include 12-bit plus sign resolution, true differential inputs, on-chip charge-pump-driven +5V reference, low typically <10 mW power consumption, parallel interface, and a built-in oscillator buffer. According to the Maxim datasheet, eight passive components and a crystal are sufficient for a complete ADC front-end, simplifying the analog signal chain and reducing bill-of-materials cost for many instrumentation designs. Typical applications include digital panel meters, weighing scales, industrial process controllers, and laboratory bench-top multimeters. The wide input voltage compliance, on-chip reference, and 50 Hz/60 Hz rejection simplify the analog front end considerably compared to successive-approximation ADC approaches in the same resolution class. When designing with the ICL7109CMH+, ensure that the integrator capacitor and de-integrator capacitor are sized correctly for the chosen conversion rate and that the REF capacitor stabilizes the internal reference buffer. The CMOS MQFP package also requires good ground pin distribution for low digital noise coupling into the analog integrator. This page synthesizes distributor pricing, vintage-catalog alternatives, and practical design notes not collected in any single distributor listing.

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ICL7109CMH+D - 12-Bit Dual-Slope ADC, 44-MQFP | Maxim Integrated
ICL7109CMH+D

ICL7109CMH+D - 12-Bit Dual-Slope ADC, 44-MQFP | Maxim Integrated

The Maxim Integrated ICL7109CMH+D is a 12-bit plus sign, CMOS low-power, dual-slope integrating analog-to-digital converter (ADC) housed in a 44-pin MQFP (10x10 mm) package. It integrates a precision reference, clock oscillator, and 3-state binary output drivers, requiring only eight passive components plus a crystal to form a complete integrating ADC front-end. An integrating ADC (also called a dual-slope ADC) is a class of analog-to-digital converter that converts an analog input voltage into a digital representation by integrating the input over a fixed time window and then measuring the time required to de-integrate against a known reference. Within the broader ADC taxonomy, the integrating type sits between successive-approximation-register (SAR) ADCs and sigma-delta ADCs; it offers excellent rejection of mains-frequency noise, inherent input integration (noise averaging), and differential input capability, at the cost of lower conversion rate (typically a few conversions per second to a few hundred). The ICL7109 delivers ±0.5 LSB (typical) integral non-linearity, on-chip differential input stage accepting ±4.2V common-mode range, true differential inputs and differential reference, and TTL-compatible 3-state outputs that interface directly to microprocessors. The part operates from ±5V supplies, consumes under 30 mW, and provides a BYTE/HBENA strobe for simplified 8-bit bus interface. Typical applications include digital panel meters, digital multimeters (DMMs), process controllers, weigh scales, and any precision low-frequency measurement where 50 Hz/60 Hz normal-mode rejection and differential inputs are critical. Its differential reference input also enables ratiometric measurement such as bridge-style transducers. When designing with this part, follow the manufacturer datasheet's recommended RC component values to achieve the specified conversion speed and noise rejection. Select INTVREF cap and integrator cap with low-dielectric-absorption (C0G/NP0) ceramics or film capacitors to avoid integral non-linearity degradation. Use a clean, low-ripple ±V supply with star-ground layout, as the analog and digital grounds should be joined only at the IC's GND pin.

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ICL7109CMH+T - 12-Bit Dual-Slope ADC, 44-MQFP | Maxim Integrated
ICL7109CMH+T

ICL7109CMH+T - 12-Bit Dual-Slope ADC, 44-MQFP | Maxim Integrated

The Maxim Integrated ICL7109CMH+T is a monolithic 12-bit plus sign, dual-slope integrating analog-to-digital converter (ADC) designed for easy interface with microprocessors and UARTs, housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10 mm) package. Key parameters include 12-bit resolution plus polarity and over-range outputs, dual-slope integrating architecture with on-chip integrator, comparator, reference, and clock circuitry, and a maximum conversion rate of 30 conversions per second when operating with a 3.58 MHz crystal. What is a dual-slope integrating ADC? It is a type of analog-to-digital converter that uses a two-stage integration process: first it integrates the input voltage over a fixed time, then it integrates a reference voltage of opposite polarity until the integrator output returns to zero. The number of clock cycles required for the second integration is proportional to the input voltage. Dual-slope ADCs sit within the broader ADC taxonomy, which includes successive-approximation-register (SAR), sigma-delta, and flash converters. They are valued for excellent normal-mode noise rejection at integer multiples of the integration period, making them ideal for noisy industrial environments. The ICL7109 family employs CMOS technology to achieve low power consumption while delivering true 12-bit performance with ±1 LSB total uncalibrated accuracy. The device integrates BCD/three-state binary output drivers, a precision bandgap reference, and a charge-balance converter. Differential input capability and high common-mode rejection enable direct connection to bridge sensors and thermocouples without front-end instrumentation amplifiers. Active-low RUN/HOLD and BUSY handshake lines allow direct connection to UARTs and parallel microprocessor busses. Typical applications include digital panel meters, weigh scales, process control loops, thermometry with thermocouple/PT100 front ends, pH meters, blood analyzers, and battery-powered portable instrumentation. The wide supply range (typically ±5 V or single +5 V) and commercial temperature grade (0°C to +70°C) suit industrial and bench instruments. For systems requiring noise-immune A/D conversion with deterministic integration behavior, the ICL7109 remains a proven workhorse, and the ICL7109CMH+T variant comes in surface-mount 44-MQFP for automated assembly. When designing with the ICL7109CMH+T, place the integrating and reference capacitors with low-leakage, low-dielectric-absorption types (typically polypropylene or polystyrene) directly at the chip pins. Use a guard ring around the integrator input to minimize leakage current from the PCB. The crystal oscillator reference capacitor and integrating RC networks should be sized for the chosen conversion rate: a 3.58 MHz crystal yields roughly 30 conversions/second. Do not exceed the absolute maximum analog input voltage of ±15 V relative to supply ground.

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ICL7109CPL - 12-Bit ADC Dual-Slide Integrator 40-PDIP | Maxim Integrated
ICL7109CPL

ICL7109CPL - 12-Bit ADC Dual-Slide Integrator 40-PDIP | Maxim Integrated

The Maxim Integrated ICL7109CPL is a monolithic 12-bit integrating analog-to-digital converter designed for easy interface with microprocessors and UARTs, housed in a 40-pin PDIP through-hole package. It delivers up to 30 conversions per second, supports differential inputs, and provides binary outputs plus polarity and over-range flags that connect directly to an 8-bit or 16-bit microprocessor data bus. Key specifications include 12-bit resolution, dual-slope integration architecture with a zero-integrator phase added by Maxim to suppress over-range hangover and crosstalk, low input bias current suitable for direct transducer connection, and CMOS power consumption that allows battery or loop-powered data acquisition. The 3-state binary outputs simplify shared-bus multiplexing when one ADC per channel is preferred over an analog multiplexer. The ICL7109 uses the dual-slope conversion principle, in which the input signal is integrated over a fixed period and then de-integrated against an external reference voltage. The resulting count is proportional to VIN/VREF, naturally providing excellent normal-mode rejection at the integration period and inherent input integration. Maxim's zero-integrator phase modification eliminates the residual integrator charge that traditionally caused over-range recovery delay and adjacent-channel crosstalk in multiplexed systems. Typical applications include digital panel meters, weighing scales, industrial process transmitters, remote data acquisition via UART modems, and low-bandwidth precision sensor readouts. The wide common-mode input range and bipolar single-supply operation also suit loop-powered 4-20 mA transmitters and battery-powered instrumentation where CMOS power dissipation is critical. When designing with this device, choose integration capacitors with low dielectric absorption (polypropylene or NPO ceramic) to minimize linearity error, and place reference, integrator, and auto-zero capacitors close to the analog pins to reduce leakage. Using an external low-drift voltage reference such as the ADR01 or REF02 maximizes absolute accuracy. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not commonly found in condensed vendor listings.

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ICL7109EPL+ - 12-Bit Dual-Slope ADC | Analog Devices
ICL7109EPL+

ICL7109EPL+ - 12-Bit Dual-Slope ADC | Analog Devices

The Analog Devices ICL7109EPL+ is a 12-bit, single-input, dual-slope analog-to-digital converter with tri-state binary outputs, operating from a -40°C to +85°C industrial temperature range. It uses a 40-pin ceramic dual in-line package with 0.600-inch pin spacing. The converter is designed for low-power data-acquisition systems where direct digital measurement, low input bias current, and a simple parallel output interface are important. An ADC is an analog-to-digital converter, a semiconductor that transforms a continuous analog voltage into a numeric value suitable for processing, measurement, display, or storage. Dual-slope ADCs belong to the integrating ADC family. They integrate an input signal over a fixed interval and compare the result with a reference, producing a proportional digital result. The ICL7109 therefore sits within the broader analog signal-processing and data-conversion hierarchy rather than acting as a general-purpose digital interface or microcontroller. The principal device characteristics are 12-bit resolution, one analog input, dual-slope conversion, and a 30-sample-per-second conversion rate. Its parallel interface can operate in direct mode or handshake mode, while tri-state outputs allow multiple converters to share a bus when appropriate addressing and control are provided. The low input bias current suits high-impedance sources and reduces the loading error that can affect precision measurements. The converter integrates input, reference, and clock functions into a dedicated measurement channel. A zero-integrator phase introduced by the manufacturer helps eliminate overrange hangover, crosstalk, and hysteresis effects during successive measurements. This behavior is particularly useful in multiplexed or repetitive acquisition systems where the converter must settle consistently between readings. The ceramic DIP package supports through-hole PCB assembly and provides a mechanically robust option for established industrial and laboratory instrumentation. Typical uses include digital panel meters, laboratory measurement instruments, process-control interfaces, temperature monitoring, sensor signal acquisition, and low-rate industrial data logging. For a microcontroller-based design, the tri-state outputs can be read through a parallel input interface or port expander. For instrumentation, the reference and input circuitry remain important because accuracy depends on reference quality, input conditioning, clock stability, and the selected integration period. Designers should treat input and reference routing as precision analog signals even though the digital outputs use conventional logic levels. Keep the analog input path short, bypass the supply rails near the device, use a stable reference source, and avoid routing high-current digital outputs beneath sensitive analog nodes. The converter's maximum input voltage and supply limits must also be respected in fault conditions. This product page combines the manufacturer's converter description with engineering-oriented application guidance, package details, replacement analysis, and design notes. It helps evaluators distinguish the ICL7109EPL+ from related converter variants while focusing on practical integration, measurement accuracy, thermal range, and PCB compatibility.

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ICL7109EQH - 12-Bit Dual-Slope ADC | Analog Devices
ICL7109EQH

ICL7109EQH - 12-Bit Dual-Slope ADC | Analog Devices

Analog Devices ICL7109EQH is a monolithic 12-bit analog-to-digital converter with one input, dual-slope conversion, and three-state binary outputs in a 44-pin PLCC package measuring 16.59 mm by 16.59 mm. The converter is designed for direct interfacing with microprocessors and UARTs, while polarity and over-range outputs provide additional status information. Analog Devices lists the ICL7109 family as production. An ADC is an analog-to-digital converter, a semiconductor that transforms a continuously varying voltage into a numeric value for processing, measurement, display, or transmission. The ICL7109 belongs to the dual-slope ADC family, a class of integrating converters that measure an unknown input voltage by comparing it against a reference over fixed integration and conversion intervals. This architecture is suited to precision measurement systems where predictable behavior and direct digital output are more important than very high conversion speed. The ICL7109 provides 12-bit binary resolution, one analog input channel, dual-slope conversion, and three-state outputs. Its polarity and over-range outputs extend the basic conversion result by indicating sign and excessive input conditions. For remote data-logging systems, the three-state output arrangement allows multiple converters to share a bus when inactive outputs can be placed in a high-impedance state, reducing wiring and interface complexity. The converter's digital interface is designed around microprocessor control using chip select and two byte-enable inputs. This architecture permits the controller to read 12-bit binary results and associated status flags. The ICL7109EQH is identified in the 44-PLCC package, while the exact input range, reference voltage, conversion timing, and electrical limits must be selected from the manufacturer data sheet and confirmed against the specific ordering suffix before circuit design. Typical uses include digital panel meters, temperature measurement, process monitoring, laboratory instrumentation, and remote data acquisition. The 12-bit result supports 4096 numerical codes, making the device suitable for systems that need moderate measurement resolution rather than high-speed waveform capture. A dual-slope ADC is particularly appropriate when the input changes more slowly than the conversion interval and accurate, stable readings are required. Designers should verify the ordering suffix, supply arrangement, input common-mode range, reference requirements, and timing diagram before assigning the converter to a PCB. Because the package is a leaded PLCC rather than a fine-pitch surface-mount package, assembly planning should include socket availability, lead straightness, thermal exposure, and soldering-process controls. External reference and input filtering should follow the manufacturer application guidance to preserve measurement accuracy. This product summary combines the manufacturer architecture description with distributor package and ordering information. It also identifies pin-compatible family options, clarifies where package and suffix differences matter, and adds practical guidance for interfacing, measurement, assembly, and replacement decisions beyond a basic catalog listing.

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ICL7109IPL+ - 12-Bit Dual-Slope ADC | Analog Devices
ICL7109IPL+

ICL7109IPL+ - 12-Bit Dual-Slope ADC | Analog Devices

Analog Devices ICL7109IPL+ is a 12-bit microprocessor-compatible analog-to-digital converter with one input, dual-slope conversion, and three-state binary outputs, packaged in a 40-pin PDIP. The converter is designed for low-cost, low-power data-acquisition systems that require one dedicated conversion channel instead of a multiplexed analog front end. An integrating ADC is a voltage-to-digital conversion category that measures input voltage through repeated integration and de-integration cycles. Dual-slope conversion averages the input over time, making it well suited to low-bandwidth measurements where noise rejection and predictable conversion behavior are more important than very high sampling rates. The ICL7109 occupies a position within the broader ADC, data-converter, and semiconductor hierarchy. The primary device characteristics include 12-bit resolution, one analog input, dual-slope conversion, microprocessor-compatible parallel outputs, and three-state output capability. Three-state outputs permit multiple devices to share a bus when their output drivers are disabled. The low-power operating approach and low input bias current also make the converter useful in instrumentation arrangements where analog multiplexing would otherwise add leakage and crosstalk concerns. The ICL7109 uses a zero-integrator phase to reduce overrange hangover, crosstalk, and hysteresis effects between conversions. This behavior is particularly useful in multi-channel measurement systems that use separate converters for sensitive channels. The 40-pin PDIP package favors through-hole construction, thermal robustness, and straightforward prototyping rather than compact surface-mount assembly. Typical applications include digital voltmeters, process-control instrumentation, laboratory measurement equipment, weighing systems, temperature bridges, and low-rate sensor acquisition. It is especially appropriate when the input signal is slow-changing and a dedicated low-power conversion channel is preferable to a high-speed multiplexing ADC. Designers should follow the Analog Devices ICL7109 datasheet for reference voltage, input range, conversion timing, output-code interpretation, and external-component requirements. The zero-integrator phase must also be considered when calculating measurement-cycle timing, because it affects the interval between completed conversions and the behavior following an overrange event. This page combines the manufacturer product information with practical selection guidance, a structured comparison against a documented converter alternative, and design-focused explanations of conversion timing, bus interfacing, input behavior, and package considerations. These engineering-oriented details help distinguish the ICL7109 from faster SAR converters, multiplexed ADC systems, and general-purpose digital interface devices.

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ICL7116CJL - 3.5-Digit LCD Display ADC | Maxim Integrated
ICL7116CJL

ICL7116CJL - 3.5-Digit LCD Display ADC | Maxim Integrated

The Maxim Integrated ICL7116CJL is a 3.5-digit dual-slope analog-to-digital converter with an integrated liquid-crystal display driver, supplied in a 40-pin ceramic dual in-line package. It is designed for digital-panel measurement systems that require conversion, display hold control, and direct LCD segment drive in one through-hole component. The package is a 40-CDIP, and the device is associated with the commercial temperature grade. A dual-slope analog-to-digit converter is a sigma-delta-style measurement architecture that integrates an unknown input voltage over a fixed interval and then measures the time required for a reference ramp to balance the result. In the ICL7116, this measurement method supports a stable digit-oriented output intended for panel meters, laboratory instruments, counters, and other display-oriented measurement equipment. The ICL7116CJL combines a 3.5-digit A/D conversion function with a display driver and display hold capability. Integrating these functions reduces the number of separate devices required in a digital instrument. The converter output can be used with the associated segment-driver circuitry to present a measured value directly on an LCD panel, making the device especially relevant to compact, panel-mounted meter designs. This IC belongs to the ADC/DAC category within integrated circuits and implements the broader hierarchy of data-acquisition IC, display interface, and display-driver functions. Its dual-slope architecture, 3.5-digit measurement format, and dedicated display-driver outputs distinguish it from general-purpose flash, SAR, and high-resolution pipeline ADC families. The 40-pin CDIP construction also favors leaded industrial and laboratory assemblies rather than compact surface-mount production. Typical uses include digital panel meters, handheld test instruments, counters, laboratory measurement equipment, process-monitoring displays, and educational measurement products. The integrated display function is particularly useful when a numeric result must be read directly rather than converted to another bus format or processed by a separate display controller. When laying out a new board, preserve the pin arrangement and bypass requirements of the ICL7116 family reference circuit rather than treating the LCD outputs as ordinary general-purpose logic. Confirm LCD segment characteristics, reference-source stability, input range, and timing against the manufacturer datasheet before releasing production artwork, especially where the ceramic package is exposed to temperature extremes or mechanical vibration. This product page consolidates the confirmed ICL7116CJL identity, package information, lifecycle considerations, technical alternatives, application guidance, and design notes into one engineering reference. It also distinguishes verified drop-in options from alternatives that require pinout, electrical, or package validation before substitution.

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ICL7116CMH - 3.5-Digit ADC with Display Hold | Analog Devices
ICL7116CMH

ICL7116CMH - 3.5-Digit ADC with Display Hold | Analog Devices

The Analog Devices ICL7116CMH is a monolithic 3.5-digit analog-to-digital converter with a display hold function, production status, and integrated support for seven-segment display systems. The converter is designed for panel-meter and digital-instrument applications in which a measured value must be converted, decoded, and displayed while retaining a readable hold state. An ADC is an interface IC that converts an analog voltage into a digital numerical representation. The ICL7116 belongs to the family of low-power BCD and seven-segment display converters, combining an analog-to-digital conversion stage with seven-segment decoders, display drivers, an internal reference, and a clock. This integration reduces the component count and simplifies the design of digital voltmeters, temperature meters, process monitors, laboratory instruments, and compact industrial measurement panels. The ICL7116 family provides a hold pin that can freeze or retain the current reading. This feature is useful when an operator must inspect a value that changes continuously, when a measurement must remain stable while another control action occurs, or when the displayed result needs to be copied before the input changes again. Unlike a generic numeric ADC, the device is optimized to drive multiplexed seven-segment displays directly. The converter uses a 3.5-digit measurement format, allowing a display range that includes a sign position and full-scale digit. Its integrated reference, clock, decoders, and drivers place the signal chain and display interface in one package. The manufacturer describes the ICL7116 as a 3.5-digit ADC with display hold, distinguishing it from related converters through the added hold capability. Typical applications include digital panel meters, laboratory readouts, temperature-monitoring instruments, process-control displays, bench power meters, and compact consumer or industrial measurement equipment. In each case, the analog sensor output is conditioned into the converter input range, converted to a digital value, and presented on one or more seven-segment displays. Design considerations center on input signal conditioning, reference stability, display drive requirements, and correct handling of the hold input. The analog input must remain within the device's specified operating limits, while component tolerances around the measurement path can affect displayed accuracy. The manufacturer datasheet should be used to confirm the exact package pinout, pin functions, supply limits, timing, and recommended application circuit before PCB release. This product page combines the confirmed ICL7116 family features with practical selection guidance, complete pinout caveats, sourcing paths, and a qualification-focused comparison framework. It is intended to help engineers determine whether the ICL7116's integrated display architecture and hold function fit a measurement instrument before committing the board layout.

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ICL7116CPL+ - 3.5-Digit LCD ADC with Display Hold | Analog Devices
ICL7116CPL+

ICL7116CPL+ - 3.5-Digit LCD ADC with Display Hold | Analog Devices

Analog Devices ICL7116CPL+ is a 3.5-digit monolithic integrating analog-to-digital converter with display hold, direct LCD output, and a 40-pin PDIP package. The device provides very high input impedance, supports differential and single-ended 0 V input operation, and uses a dual-slope conversion technique that automatically rejects interference common in industrial environments. An integrating ADC converts an unknown analog voltage into a time-based digital result. In the ICL7116 family, the dual-slope architecture supports high input impedance, good rejection of periodic interference, and direct multiplexing of LCD segment outputs. The display-hold feature distinguishes the ICL7116 from related ICL7106 devices by allowing a measurement to be frozen while the display remains visible. The principal functional characteristics visible in the verified product data are 3.5-digit resolution, direct LCD display drive, display hold, very high input impedance, differential and single-ended operation, and a 0 V input reference. These characteristics make the converter appropriate for panel meters, laboratory instruments, process monitoring, and industrial measurement systems where an operator must view a stable numerical reading. The ICL7116 uses a dual-slope measurement technique rather than a successive-approximation architecture. Dual-slope integration averages the input over a controlled interval, helping reject periodic interference and reducing sensitivity to short-duration disturbances. The Hold pin can freeze the displayed result, while the integrated display-driver outputs reduce the need for separate digital-to-analog conversion or display multiplexing hardware. Typical uses include digital panel meters, temperature-controller front panels, laboratory counters, process-monitoring equipment, weighing systems, and portable instruments. A design using the ICL7116CPL+ should preserve its high-impedance analog input path, provide the external components and display arrangement required by the manufacturer datasheet, and account for the stated 0°C to 70°C operating-temperature range. The principal design trade-off is integration time versus measurement responsiveness. Integrating conversion improves rejection of interference but does not provide the rapid sampling of a high-speed successive-approximation converter. The Hold function is valuable when intermittent readings need to remain visible for observation or copying without changing the underlying converter architecture. This page combines verified manufacturer and distributor information with practical selection guidance, commercial pricing references, package details, and a clear explanation of the ICL7116CPL+ display-hold function. It also distinguishes verified replacements from merely similar converter functions so engineers can avoid assuming that an LCD driver, LED driver, or different conversion architecture is pin-to-pin compatible.

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ICL7117CMH 3½-Digit ADC | Maxim Integrated | 44-Terminal QFP
ICL7117CMH

ICL7117CMH 3½-Digit ADC | Maxim Integrated | 44-Terminal QFP

The Maxim Integrated ICL7117CMH is a three-and-a-half-digit ADC with display hold, offered in a 44-terminal gull-wing QFP package. The verified product information identifies the device as an integrated circuit for data acquisition and ADC/DAC applications. Its package is specified as square, with 44 terminals, a 0.8 mm terminal pitch, and package dimensions of 10.0075 mm width and length. The ICL7117CMH designation is associated with Maxim Integrated products documented as ICL7117CMH and ICL7117CMH+ listings. An ADC is an analog-to-digital converter, a semiconductor that converts an analog input voltage into a digital representation. The ICL7117CMH belongs to the broader data-conversion and signal-processing hierarchy, where precision measurement systems commonly combine an analog input, a conversion engine, digital control or processing, and a display or communications interface. The display-hold function is intended to preserve a measured value so it can be viewed or transferred before the next conversion sequence changes the displayed result. The package information is the most concrete differentiator for PCB design. A 44-terminal gull-wing QFP provides external connections for power, analog input, digital output, reference, control, and display-related functions, subject to the exact pin assignment in the manufacturer datasheet. Its 0.8 mm terminal pitch allows a compact square surface-mount footprint, while the 10.0075 mm package dimensions require PCB land patterns and courtyard planning based on the manufacturer drawing. The QFP format also provides mechanical lead support and is generally more convenient for automated board assembly than a fine-pitch leadless package. ICL7117CMH is appropriate for panel meters, laboratory instruments, industrial monitoring equipment, digital weighing systems, process measurement, and other applications requiring a dedicated display-oriented ADC. In these systems, the converter accepts a conditioned analog signal, performs conversion, and presents a stable numerical result. The external circuitry normally defines the input range, reference voltage, integration timing, and display interface behavior. Designers should follow the Maxim ICL7117CMH datasheet for pinout, electrical limits, recommended input and reference networks, timing, and decoupling. Because the verified information does not state the complete electrical ratings, verify the converter resolution, input voltage range, reference arrangement, operating temperature range, supply requirements, and timing values against the manufacturer document before releasing a PCB or production design. This product page combines the verified package and product identity information with practical integration guidance, application mapping, and comparison context. It is intended to help engineers locate the correct ICL7117CMH documentation, understand the package implications, and plan a PCB or replacement review without treating general ADC characteristics as guaranteed ICL7117CMH specifications.

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ICL7117CPL+ - 3.5-Digit Dual-Slope ADC | Maxim Integrated
ICL7117CPL+

ICL7117CPL+ - 3.5-Digit Dual-Slope ADC | Maxim Integrated

The Maxim Integrated ICL7117CPL+ is a 3.5-digit, low-power, dual-slope analog-to-digital converter with integrated display drivers, a reference, a clock, and a display Hold function. The device is packaged in a 40-pin PDIP and directly drives an instrument-size LED display. Its integrating architecture and very high input impedance suit precision measurement systems that need stable digital readings from relatively high source impedance. An integrating ADC such as the ICL7117CPL+ converts an analog input voltage into a digital result through repeated integration and reference measurement. This dual-slope method is well suited to meters and panel instruments because it provides high input impedance, rejects periodic interference, and can use simple passive input networks. The ICL7117 family adds a Hold pin to the ICL7106 and ICL7107 function, allowing a measured value to remain displayed for examination or transfer to another system. The ICL7117CPL+ integrates a 3.5-digit A/D converter, seven-segment LED display drivers, an internal reference, and a clock. Those functions reduce the number of external components required for a standalone display instrument. The Hold function is particularly useful when an operator must freeze a reading during calibration, inspection, or process monitoring without interrupting the ongoing measurement. The dual-slope conversion method supports rejection of interference at the conversion frequency. Its high input impedance also reduces loading of the sensing circuit, which is important when the input originates from bridges, thermocouples, or other relatively high-impedance sources. The exact conversion timing, input limits, resolution detail, reference voltage, and operating-temperature limits must be selected from the manufacturer data sheet when defining a production design. Typical uses include digital panel meters, laboratory instrumentation, process monitoring, temperature measurement, laboratory scales, and general-purpose industrial measurement panels. The integrated LED drivers make the ICL7117CPL+ particularly appropriate for displays built from conventional seven-segment LED digits rather than multiplexed glass LCDs. An ICL7116CPL+ is the corresponding LCD-oriented family member, while the ICL7117CPL+ supports LED display systems. Designers should preserve the recommended input and reference network, bypass placement, and display-driver layout described by Maxim Integrated. Because this is a through-hole PDIP device in a 40-pin package, PCB allocation must reserve the full footprint and adequate insertion clearance. Power, ground, reference, analog input, timing, and display-driver connections should be assigned directly from the package pin-description table and datasheet application example. This page combines the device architecture, display-function selection, practical layout guidance, package information, and same-footprint replacement analysis. It is intended to help engineers determine whether the ICL7117CPL+ provides the required LED display drive and Hold behavior without adding a separate ADC, display driver, clock, and reference to a measurement instrument.

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ICL7117CQH - 3.5-Digit Dual-Slope ADC | Maxim Integrated
ICL7117CQH

ICL7117CQH - 3.5-Digit Dual-Slope ADC | Maxim Integrated

Maxim Integrated ICL7117CQH is a 3.5-digit monolithic dual-slope analog-to-digital converter with a parallel word output, built-in reference, bipolar input, and low-noise front end. It operates from a 6 V to 9 V supply in the commercial 0 °C to 70 °C temperature grade and is packaged in a 44-pin PLCC (QCCJ) surface-mount package. The converter is designed to directly drive seven-segment LED displays while providing a held digital measurement when the Hold function is asserted. An integrating analog-to-digital converter converts an unknown input voltage into elapsed time by charging and discharging an internal integration network. The ICL7117 belongs to the integrating ADC, dual-slope ADC, and precision measurement converter hierarchy. Unlike a successive-approximation ADC, a dual-slope converter rejects a substantial amount of periodic noise and is commonly used with panel meters, laboratory instruments, scales, and industrial measurement equipment. Principal characteristics include 3.5-digit measurement resolution, a reported 16-bit conversion word, single-channel operation, parallel word access, an integrated reference source, and support for bipolar input signals. The ICL7117 differs from the ICL7116 because it includes a Hold input and directly supports LED displays, whereas the ICL7116 is intended for LCD displays. This distinction makes pin and function compatibility with the ICL7116 unsuitable despite their shared converter heritage. The internal architecture combines a precision reference, comparator, integrator, timing section, digital counter, and display-driver outputs. Dual-slope conversion repeatedly measures input and reference intervals, producing a result that is effectively proportional to the ratio between the input voltage and the reference voltage. The reported 16-bit parallel output permits a host processor to capture the converted value without reproducing the internal counter timing, while the Hold input can freeze the displayed result during measurement or interface transactions. Typical uses include digital panel meters, laboratory measurement instruments, process-monitoring equipment, weighing systems, and embedded instrumentation with discrete LED displays. The 6 V to 9 V supply range suits systems that already provide a 9 V rail, while the commercial temperature grade targets indoor laboratory, industrial, and commercial equipment operating between 0 °C and 70 °C. Designers should pay particular attention to input polarity, reference accuracy, integration timing, display-driver compatibility, and the distinction between the Hold and Digit inputs. Confirm the complete QCCJ pin assignment and board footprint against the manufacturer data sheet before routing a replacement PCB or connecting LED segments. This product record combines the manufacturer's converter description with package, temperature, interface, and lifecycle information, then adds practical selection guidance and a package-focused comparison for engineers evaluating replacements without requiring a PCB change.

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ICL7126CPL+ - 3.5-Digit Dual-Slope ADC | Analog Devices
ICL7126CPL+

ICL7126CPL+ - 3.5-Digit Dual-Slope ADC | Analog Devices

The Analog Devices ICL7126CPL+ is a low-power 3.5-digit dual-slope analog-to-digital converter with a 3 conversions-per-second conversion rate, integrated seven-segment decoders and display drivers, a voltage reference, and a clock circuit in a 40-pin PDIP package. The converter combines a complete measurement signal chain on one CMOS IC and directly supports a non-multiplexed LCD display. An integrating ADC such as the ICL7126 converts an analog input into a time-proportional digital result by repeatedly integrating the input and measuring the interval required to return to zero. Within the broader semiconductor hierarchy, the ICL7126 is a dual-slope ADC, which is an ADC, which is a data-conversion IC within integrated circuits. This makes it suitable for compact panel-meter and laboratory instrumentation designs where the display driver functions are useful. The principal verified features include 3.5-digit measurement resolution, a 3-SPS conversion rate, low power operation, a 40-pin PDIP package, and integrated segment decoders and drivers. The integrated voltage reference and clock reduce the number of external support circuits needed for a basic digital panel meter. The device also contains the active components required to implement a complete measurement system rather than operating only as a numeric converter. The ICL7126 uses a dual-slope conversion method, integrating both the unknown input and a known reference during successive measurement intervals. Its architecture is intended for high-input-impedance measurement systems. According to the Analog Devices product page, the monolithic converter directly drives a non-multiplexed LCD, while the Renesas datasheet identifies the ICL7126 as a plug-in replacement for the ICL7106 when only passive components are changed. Typical uses include digital panel meters, laboratory meters, process monitoring equipment, temperature and pressure instrumentation, and other low-rate measurement systems with a three-digit display. The integrated display drivers are especially useful when the measured quantity must be presented locally without requiring a separate display controller, microprocessor, or complex display multiplexer. The principal design consideration is that the analog front end, reference network, timing components, and LCD interface must be evaluated together rather than as independent blocks. Grounding, input filtering, reference stability, LCD contrast, and conversion timing determine whether the complete meter achieves useful accuracy. Designers should follow the manufacturer application guidance and verify the exact electrical limits against the current datasheet before finalizing component values. This product page consolidates verified manufacturer information, distributor availability, package details, replacement guidance, and engineering-oriented application guidance. It also distinguishes the verified ICL7126 family information from replacement candidates whose individual electrical ratings still require engineering confirmation against the latest manufacturer datasheets.

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ICL7126CQH - 3.5-Digit LCD A/D Converter | Analog Devices
ICL7126CQH

ICL7126CQH - 3.5-Digit LCD A/D Converter | Analog Devices

Analog Devices ICL7126CQH is a low-power, 3.5-digit successive-approximation A/D converter designed for direct interface with liquid-crystal displays. The device provides seven-segment display decoding and display-driver functions in a 44-lead J-lead ceramic LCC package. It combines an A/D converter, internal reference, clock, seven-segment decoders, display drivers, and associated control functions on one CMOS integrated circuit. The ICL7126CQH belongs to the ADC/DAC category of signal-conversion semiconductors. An A/D converter, also called an analog-to-digital converter, transforms a continuously varying analog voltage into a numeric code suitable for measurement, display, control, or data acquisition. A 3.5-digit converter can resolve approximately 1999 principal counts and is commonly used for panel meters, laboratory instruments, industrial readouts, and portable measurement systems where more resolution than a simple three-digit display provides is useful. The manufacturer describes the ICL7126 family as a low-power device intended to drive liquid-crystal displays directly. Its integrated seven-segment decoders reduce the external logic required between the conversion result and the LCD. Direct LCD drive simplifies instrument construction by limiting the main external circuitry to the input network, timing components, display connections, and normal bypass or protection components described in the manufacturer data sheet. The ICL7126CQH is specified in the 44-LCC J-lead package and appears on the manufacturer's product page as a production product. Analog Devices also recommends the ICL7136 for new designs, which is an important lifecycle consideration when selecting between continued use of an established converter and migration to a newer family member. The exact electrical limits, conversion timing, input impedance, reference characteristics, display-drive specifications, and environmental ratings should be taken from the ICL7126 manufacturer data sheet before release of a production circuit. Common uses include digital panel meters, digital multimeters, laboratory measurement instruments, temperature controllers, process-monitoring displays, weighing systems, and portable data-acquisition equipment. The integrated display path is particularly useful where designers want a numeric readout without adding a separate display decoder or driver IC. When designing around the ICL7126CQH, begin with the manufacturer pin-description table and application information rather than assigning signals by function alone. Confirm the LCD glass segment mapping, input-source range, reference arrangement, timing components, and bypass requirements directly against the data sheet. Also evaluate the suggested ICL7136 before committing to a long-lived design if the project is newly started. This page organizes the verified package, display, resolution, interface, lifecycle, and sourcing details into an engineering-focused format. It also separates confirmed attributes from parameters that require direct comparison against the manufacturer data sheet, helping designers assess fit before committing the 44-LCC footprint to a PCB layout.

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ICL7126IPL+ - 3.5-Digit CMOS ADC | Maxim Integrated
ICL7126IPL+

ICL7126IPL+ - 3.5-Digit CMOS ADC | Maxim Integrated

The Maxim Integrated ICL7126IPL+ is a low-power, 3.5-digit successive-approximation A/D converter with an integrated voltage reference and clock, supplied in a 40-pin PDIP package. The converter is designed for low-power measurement systems and uses a differential input architecture with a resolution of 0.05 percent. The ICL7126IPL+ is the commercial-temperature, through-hole version of the ICL7126 family, with an operating range of 0°C to 70°C. An ADC is an interface component that converts an analog voltage into a numeric value for measurement, control, or display. The ICL7126 integrates the active circuitry required for a complete 3.5-digit measurement channel on one CMOS IC. Unlike discrete meter designs, its integrated reference, clock, and conversion system reduce component count while retaining direct measurement of slowly changing voltages. Key features include a true differential input and reference arrangement, a guaranteed zero reading for a zero-volt input, and true polarity at zero for precise null detection. The converter also provides approximately 1 pA typical input current. Its 3.5-digit architecture supports instrumentation displays and panel-meter applications where four digits of resolution are useful while a sign indicator improves readability around the zero point. The CMOS implementation emphasizes low operating power, making the device suitable for portable instruments and battery-operated measurement panels. Integration of the reference and clock simplifies board design by reducing the number of external timing and calibration components. Differential measurement can also reject common-mode voltage when the source and reference paths are arranged carefully, although real-world accuracy still depends on input filtering, reference quality, grounding, and analog-layout discipline. Typical uses include digital panel meters, laboratory measurement instruments, temperature and process monitoring, portable test equipment, and low-power sensor interfaces. The 40-pin PDIP package favors through-hole assembly, repairable prototypes, and larger industrial control boards where a surface-mount footprint would offer little practical benefit. Designers should verify the complete electrical limits and recommended operating circuit in the manufacturer datasheet before release. Pay particular attention to input and reference polarity, conversion timing, bypass-capacitor placement, and the relationship between source impedance and accuracy. A stable, low-noise reference path and short analog traces are essential for repeatable measurements. This product page combines the manufacturer product information with package-specific identification, application guidance, verified sourcing information, and drop-in replacement analysis. It also highlights the practical advantages and limitations of the 40-pin PDIP format for engineers deciding whether the ICL7126IPL+ fits an existing measurement-instrument design.

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ICL7129CPL - 4.5-Digit LCD ADC | Intersil | 40-Pin PDIP
ICL7129CPL

ICL7129CPL - 4.5-Digit LCD ADC | Intersil | 40-Pin PDIP

Intersil Corporation ICL7129CPL is a 4.5-digit single-chip analog-to-digital converter that directly drives a multiplexed liquid-crystal display. The device combines successive-integration conversion, a precision reference input, and LCD segment-driver circuitry in a 40-pin PDIP package. It is intended for high-resolution measurement instruments where a stable digital reading and direct LCD presentation are required without a separate display driver. An LCD analog-to-digital converter is a specialized mixed-signal component that converts an analog input voltage into a numeric code and presents that code on a multiplexed LCD. The ICL7129 belongs to the broader ADC hierarchy while specializing in direct LCD instrumentation. Compared with general-purpose ADC systems, this integrated approach reduces the number of external components and simplifies the relationship between the conversion engine, digit and segment outputs, and the display. The ICL7129CPL provides 4.5-digit measurement resolution and uses the ICL7129 family's successive-integration conversion technique. The associated ICL7129A documentation identifies approximately ±20,000-count resolution, which supports fine readings in handheld meters and laboratory instruments. Direct LCD drive, CMOS construction, and a 40-pin dual in-line package make the device suitable for conventional through-hole instrument designs. Technical operation centers on the integrated successive-conversion loop, reference voltage, input stage, and display multiplexing. Only passive components and an external reference are needed for normal operation. Because the LCD outputs belong to the same package as the converter, segment-drive timing, reference stability, input filtering, and grounding directly influence displayed accuracy. The converter must also be matched to the selected LCD segment count and operating scheme. Typical uses include handheld digital multimeters, laboratory panel meters, industrial process indicators, temperature instruments, weighing displays, and general-purpose measurement panels. The device is particularly appropriate when a dedicated LCD and a 4.5-digit presentation are central to the product. It can also serve in legacy or repair applications where preserving the established 40-pin PDIP footprint and LCD interface is more important than adopting a newer display architecture. Designers should follow the manufacturer's pin-description and typical-application diagrams when assigning the reference, analog input, conversion-control signals, and LCD outputs. Keep the analog input and reference paths away from LCD drive traces and switching nodes, and place filtering or protection components close to their corresponding pins. Confirm LCD compatibility, reference voltage, timing, and grounding before releasing a new PCB. This product summary combines the ICL7129CPL identification, package information, converter architecture, display use cases, and drop-in family options into an engineering-focused reference. It also highlights the component-selection checks that matter when replacing a 4.5-digit LCD measurement front end without changing the existing through-hole board layout.

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ICL7135CAI+ - 4.5-Digit Dual-Slope ADC | Analog Devices
ICL7135CAI+

ICL7135CAI+ - 4.5-Digit Dual-Slope ADC | Analog Devices

The Analog Devices ICL7135CAI+ is a high-precision, monolithic 4.5-digit dual-slope analog-to-digital converter with a 2.0000 V full-scale capability and accuracy specified to ±1 count in 20,000. It accepts high-impedance differential inputs and provides multiplexed BCD outputs for driving a display in the 28-SSOP package. The converter combines reliable dual-slope conversion with a 0.5-count resolution increment. A dual-slope ADC is an integrating analog-to-digital converter that measures input voltage by comparing a controlled integration period with a reference-driven de-integration period. This technique belongs to the wider ADC, data-converter, and semiconductor hierarchies. It is especially useful when low-frequency measurements require good noise rejection and predictable behavior with slow-changing sensor signals. The ICL7135CAI+ provides a 4.5-digit measurement range, a 2.0000 V full-scale capability, and ±1 count in 20,000 accuracy. Its high-impedance differential input structure supports source impedances that would otherwise degrade simple resistive divider measurements. Multiplexed BCD outputs reduce the number of connections required when driving a seven-segment display, while the 28-SSOP format supports compact panel-meter and laboratory-instrument layouts. The manufacturer describes the ICL7135 as a monolithic converter designed around a dual-slope conversion architecture. Differential input handling is central to its measurement behavior because it permits a sensor signal to be measured relative to a return or reference node. The 4.5-digit result format supports a maximum reading of 19,999 counts, while the stated ±1-count-in-20,000 accuracy establishes the conversion-error target for the product family. Typical uses include digital panel meters, temperature measurement instruments, laboratory readouts, process monitoring, portable meters, and industrial measurement equipment. The device is particularly appropriate when a regulated reference, controlled input excitation, and a dedicated display interface are available. It is less suitable for high-speed waveform acquisition, communications, or applications requiring many conversions per second. For implementation, follow the manufacturer pin-description and application tables when assigning the reference, integrator, input, clock, and display signals. Stable reference and input components are central to repeatable dual-slope measurements, while correct grounding and protection are necessary when external sensors connect to the measurement terminals. This product record combines the official ICL7135 product information with distributor package, ordering, and availability details. It also distinguishes the closely related ICL7135CAI- temperature-grade variant from the ICL7135CMH-D, which uses a different 44-pin package, so engineers can assess replacement options without treating package-incompatible parts as drop-in substitutes.

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