ADC/DAC
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MAX134EPL+ - 3.75-Digit DMM ADC | Maxim Integrated | 40-DIP
The Analog Devices MAX134EPL+ is a proprietary-method, 3.75-digit digital-multimeter analog-to-digital converter with a 4-bit ADC output and 40-pin PDIP package. The verified product data identifies an industrial temperature grade, a 5 V supply, through-hole rectangular DIP construction, and operation from -40°C to +85°C. It is designed as the conversion core in a 3½-digit DMM rather than as a general-purpose waveform converter. A DMM ADC is a specialized analog-to-digital converter optimized for stable readings from meters, resistive dividers, and current-shunt inputs. Its measurement chain converts an analog voltage or resistance-derived voltage into a multiplexed digital result for a display or controller. The MAX134 evaluation kit demonstrates this use case by measuring volts, ohms, or milliamps and displaying results on a 4-digit LCD under control of a MAXQ2000 microcontroller. The MAX134EPL+ provides a 3.75-digit measurement format and a proprietary conversion method, making it appropriate for panel meters, laboratory instruments, service equipment, and industrial readouts that prioritize decimal display resolution rather than high-speed sampling. The verified distributor listing classifies the device as an ADC/DAC for special-purpose 3-digit DMM circuits, while the manufacturer product page describes the MAX134 family as a production 3¾-digit DMM circuit. Its 40-pin PDIP package exposes the dedicated functions required by the DMM signal path and associated control circuitry. Through-hole construction also suits repairable industrial and laboratory instruments, although the larger 40-pin footprint requires more board area than modern mixed-signal packages. The exact pin assignments, reference requirements, acquisition time, input architecture, and electrical limits must be confirmed against the manufacturer datasheet before layout or replacement qualification. Typical uses include digital voltmeters, resistance meters, milliammeters, panel instruments, and educational measurement platforms. In each case, the MAX134 performs the core measurement conversion while external analog switching, reference components, display electronics, and control logic complete the instrument. Because its output is optimized for DMM measurements, it should not be assumed interchangeable with a general-purpose ADC without confirming resolution, conversion timing, interface protocol, reference voltage, and pinout. For a new design, use the manufacturer MAX134 documentation and evaluation-kit schematic as the primary references. Confirm the analog input range, front-end multiplexing, reference accuracy, LCD-driving interface, grounding, and bypass requirements before layout. If replacing MAX134EPL+, verify both the 40-pin PDIP footprint and pin-by-pin behavior; package similarity alone does not establish compatibility. This page consolidates verified manufacturer and distributor information, distinguishes the component from generic ADCs, and adds practical selection and sourcing guidance beyond the basic catalog entry.
MAX135CPI+ - 15-Bit Low-Power ADC | Analog Devices
Analog Devices MAX135CPI+ is a CMOS, 15-bit binary-output analog-to-digital converter with a parallel interface, differential input, and 28-pin PDIP package. It is tested at 16 conversions per second and can operate at up to 6 times that rate, while the manufacturer describes Super LSBs with data averaging for up to 18-bit resolution. The converter uses multi-slope integration to provide low noise and high resolution without the conversion time of a standard integrating ADC. An ADC is a mixed-signal semiconductor that converts an analog voltage into a digital code for processing, measurement, or control. The MAX135 belongs to the ADC family, and more specifically to the low-power CMOS multi-slope ADC category. Its parallel binary output provides multiple data lines, making the device suitable for systems that need a sampled measurement presented to a digital bus, microcontroller, or dedicated control logic. Key features include 15-bit binary output, differential analog input, 16-SPS tested operation, operation at up to 6 times the tested rate, and up to 18-bit resolution using Super LSBs with data averaging. The verified manufacturer information also identifies a supply current of 125 µA and a 28-pin PDIP package. These characteristics emphasize low power, low-noise conversion rather than high-speed sampling. The multi-slope integration architecture is the device’s principal technical feature. According to the Analog Devices product page, it provides low noise and high resolution in less time than standard integrating ADCs. Super LSBs and data averaging extend usable resolution beyond the nominal 15-bit output, although system accuracy still depends on the analog front end, reference source, clock, input filtering, and layout quality. The parallel interface provides a direct digital connection for suitable embedded measurement systems. Typical uses include industrial process measurement, laboratory instrumentation, low-power sensor acquisition, battery-operated portable equipment, and embedded measurement systems that can accept a parallel ADC output. The MAX135CPI+ is especially relevant where a low conversion rate, low supply current, differential input, and high-resolution averaging are more important than rapid sampling or a compact surface-mount package. Designers should pay particular attention to analog grounding, input filtering, reference stability, and acquisition timing. The 28-pin PDIP package is through-hole rather than a compact SMD package, so board space and connector availability should be checked before design commitment. Verify the complete electrical limits, pin names, timing requirements, and application circuit directly in the manufacturer datasheet before layout. This page combines verified distributor catalog information, the official Analog Devices product overview, application-oriented guidance, and an honest drop-in replacement assessment. It is intended to help engineers locate the datasheet, understand the converter’s architecture, compare meaningful variants, and plan a power-conscious parallel-interface measurement design.
MAX135CWI - 15-Bit Low-Power ADC with Parallel Interface
The Analog Devices (formerly Maxim Integrated) MAX135CWI is a 15-bit, low-power CMOS analog-to-digital converter (ADC) with a parallel interface, housed in a 28-pin wide-body SOIC (WSOIC-28 / SOIC-Wide-28) package. It performs single-channel conversions at up to 16 samples per second in its specified operating mode, and combines a multi-slope integrating architecture with Super LSBs to deliver effective 18-bit-class noise performance when the host averages successive conversions. An integrating ADC (also called a dual-slope or multi-slope converter) is a class of analog-to-digital converters that integrates the unknown input for a fixed time, then de-integrates against a known reference while counting clock pulses. Multi-slope variants like the MAX135 extend the basic dual-slope topology with additional integration phases that cancel dielectric-absorption errors and high-order integrator non-idealities. In the broader taxonomy the MAX135 belongs to the integrating-ADC family of ADCs, which sits under the data-converter category of mixed-signal ICs in power-management and signal-conditioning systems. This architecture is naturally suited to high-resolution, low-frequency measurements where noise rejection (especially 50 Hz/60 Hz line-frequency rejection) outweighs conversion speed. Key differentiating specifications include: 15-bit binary resolution (extending to ~18 bits with averaging), 16 conversions-per-second guaranteed throughput, dual-polarity differential input (typically +/- supply rails), low 125 uA typical supply current, single +5 V analog supply with the same supply also powering the parallel digital interface, and an on-chip oscillator that removes the need for an external clock. The WSOIC-28 package has an exposed thermal pad for improved heat spreading and a wide body that simplifies hand-soldering and rework. The MAX135 uses Super LSB (least significant bit) sub-LSB information and on-chip digital averaging to achieve 18-bit effective resolution. The integrating topology provides inherent rejection of mains-frequency noise (both 50 Hz and 60 Hz), making the part suitable for direct connection to slow analog signals such as thermistor bridges, strain-gauge load cells, pH probes, and other low-bandwidth precision analog-front-ends. The chip-select and read-strobe logic supports direct connection to 8-bit or 16-bit parallel microports without external glue logic. Typical applications include digital panel meters and bench-top multimeters, industrial process-control analog input modules, weigh-scale and force-measurement signal chains, precision temperature-measurement (RTD and thermocouple) front-ends, and battery monitoring in portable test equipment. The wide input range and parallel data bus also simplify interface to legacy microcontrollers and FPGA-based data acquisition (DAQ) front-ends. When designing with the MAX135, observe that the integrating topology requires the input to remain stable during the integration window; add an input buffer (op-amp follower) for high-source-impedance sensors. Use a clean analog ground plane and decouple VDD with both 10 uF bulk and 100 nF ceramic caps placed within 10 centimetres of the supply pad. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including parametric proximity scoring and same-brand-first alternative ordering for engineers sourcing the MAX135CWI today.
MAX135EPI+ - 15-Bit Low-Power Parallel ADC | Maxim Integrated
The Maxim Integrated MAX135EPI+ is a low-power, 15-bit CMOS analog-to-digital converter with a parallel binary output interface, a 28-pin PDIP package, and operation from a 4.5 V supply. It is designed for precision measurement systems that require moderate conversion throughput, low power consumption, and direct parallel data capture. The device is a single-channel ADC according to the manufacturer product description, although distributor listings identify the product family as a dual-channel ADC. The MAX135EPI+ uses multi-slope integration to reduce noise and improve resolution without the conversion time associated with a conventional successive-approximation ADC. Its parallel interface supports straightforward connection to microcontrollers, programmable logic, data converters, and laboratory measurement equipment. The industrial-temperature designation makes the part appropriate for equipment operating across extended industrial temperature conditions. The MAX135EPI+ is supplied in a through-hole 28-pin PDIP package, allowing conventional PCB assembly and socket-based prototyping. The exact reference voltage, conversion timing, input range, and electrical limits should be confirmed in the MAX135 manufacturer datasheet before final design release. According to the Analog Devices MAX135 product page, the device is a CMOS 15-bit binary-output ADC using multi-slope integration, with tested conversion performance of 16 conversions per second. The product is suitable for industrial process-control instrumentation, precision sensor interfaces, laboratory data-acquisition systems, and embedded measurement platforms where a parallel ADC is preferable to a serial-interface converter.
MAX1361MEUB+ - 10-Bit 4-Ch 150ksps ADC/Supervisor | Maxim
The Analog Devices (formerly Maxim Integrated) MAX1361MEUB+ is a 4-channel, 10-bit, low-power analog-to-digital converter (ADC) with a 2.048 V internal reference and a digitally programmable window comparator that produces an SMBus alert response. Housed in a 10-pin μMAX (uSOP) package, it supports input voltages up to 3.6 V and specified operating temperature range of -40 °C to +85 °C. The SAR architecture delivers up to 150 ksps conversion rate while drawing only microamp-level supply current, enabling long-life battery-powered monitoring designs. A system monitor (also called an analog supervisor or ADC-with-window-comparator) is an integrated data-acquisition IC that combines a multi-channel ADC, a precision voltage reference, and a programmable threshold detector in a single die. It continuously digitizes analog system parameters (rail voltages, currents via shunt, temperatures via remote diodes) and asserts a hardware interrupt when any reading falls outside a user-defined window. System monitors sit at the bottom of the power-management hierarchy, above simple comparators and below full system-on-chip PMICs. The MAX1361MEUB+ integrates a 2.048 V internal reference (the MAX1362 variant uses 4.096 V for higher dynamic range), a 4-input analog mux, and a 2-wire SMBus interface. The programmable trip window allows engineers to define independent upper and lower thresholds on each channel without host intervention, freeing the host CPU from polling. The ALERT output follows the SMBus Alert Response Address protocol, supporting multi-device shared interrupt lines. Typical applications include battery-cell voltage monitoring in portable medical and IoT devices, multi-rail power-supply supervision in servers and telecom hardware, front-end digitizing for system health monitors, and industrial process-control analog input modules. The combination of low Iq, internal reference, and 4 single-ended inputs reduces external BOM to a minimum. When laying out the PCB, keep analog traces short and shield the SMBus lines with a ground guard to maintain noise immunity on the reference. Decouple AVDD and DVDD with 0.1 μF ceramics placed within 3 mm of the respective pins.
MAX1361MEUB+T - 4-Ch 10-Bit System Monitor ADC | Maxim
The Maxim Integrated MAX1361MEUB+T is a low-power, 10-bit, 4-channel analog-to-digital converter (ADC) system monitor with a programmable trip window and SMBus alert response, offered in a 10-pin TSSOP (uMAX) package. It delivers 4 analog input channels sampled by a 10-bit successive-approximation ADC at up to 150 ksps aggregate throughput and operates from a single 2.7V to 3.6V supply. The device includes a digitally programmable window comparator with an interrupt/INT output for autonomous system monitoring, plus an SMBus alert response interface for host notification. An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that converts continuous analog voltages into discrete digital codes, and a system monitor is a specialized ADC class that adds autonomous threshold detection so a host processor is interrupted only when a measured parameter moves outside a pre-programmed window. These ICs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor, and they commonly supervise power rails, temperature sensors, and other analog health signals in space-constrained embedded designs. Key features of the MAX1361MEUB+T include 10-bit resolution, four single-ended analog input channels multiplexed into one ADC core, an integrated programmable window comparator that generates the ALERT/INT signal when any channel leaves its user-defined min/max band, and SMBus-compatible alert response that complies with the SMBALERT# protocol used by system management ICs. The interface is an I2C/SMBus-compatible serial port. The 10-pin TSSOP (also referred to as uMAX in Maxim's package family) keeps board area to about 3 mm by 3 mm and supports surface-mount reflow assembly. The device is specified over the industrial temperature range of -40C to +85C and supports an external reference voltage for the ADC core. Its low supply current makes it attractive for always-on supervisory functions in battery-powered systems where the host CPU is normally in sleep mode. The MAX1361 (internal reference setup) and MAX1362 (external reference setup) form the family; the EUB suffix indicates the 10-pin TSSOP industrial-grade package, and the +T suffix denotes tape-and-reel packaging. Typical applications include multi-rail voltage monitoring in servers, industrial control boards, and battery management systems (BMS); temperature-point monitoring with external sensors connected to the analog inputs; portable and handheld instruments requiring 4-channel data acquisition; and any embedded design that wants to offload analog threshold supervision from the main MCU. The autonomous window comparator means the MAX1361MEUB+T can wake the host only when an alarm condition occurs, reducing software overhead and interrupt traffic. When designing with the MAX1361MEUB+T, place 0.1 uF decoupling capacitors as close as possible to the VDD and GND pins, use a low-impedance analog ground, and keep analog input traces short and away from switching nodes. Configure the trip-window limits via the SMBus registers during initialization; the part then monitors autonomously and asserts ALERT/INT whenever any input leaves its programmed band. A pull-up resistor on the SMBus SDA/SCL lines and on the alert output is required. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet.
MAX1362MEUB+T - 10-Bit 4-Ch 150ksps ADC + Window Comparator | Maxim
The Maxim Integrated (Analog Devices) MAX1362MEUB+T is a 10-bit, 4-channel, low-power successive-approximation analog-to-digital converter (SAR ADC) with an integrated digitally programmable window comparator, SMBus Alert Response interface, and interrupt output, supplied in a 10-pin µMAX (U10-1) surface-mount package. It operates from a 4.5 V to 5.5 V analog supply, samples at up to 150 ksps aggregate, and provides a fixed 4.096 V internal reference that simplifies bipolar-style ±10 V measurement when paired with external input dividers. A SAR ADC is a type of analog-to-digital converter that performs a binary search across an internal capacitive DAC, capturing a single conversion in a deterministic number of clock cycles. System monitor ADCs such as the MAX1362 belong to the broader data-converter family and sit at the analog/digital boundary of mixed-signal designs, translating real-world sensor voltages into codes a microcontroller can act on. This category also includes delta-delta, pipelined, and dual-slope variants, but SAR dominates low-power multi-channel monitoring because no continuous integrator is required. Key features include four single-ended analog inputs scanned sequentially under I2C/SMBus control, an internal 4.096 V reference (versus 2.048 V on the pin-compatible MAX1361), 1 LSB INL/DNL, a programmable window comparator that flags out-of-band events without host intervention, and a hardware Alert pin conforming to the SMBus 2.0 Alert Response Address protocol. The MAX1362 also offers automatic channel scanning with interrupt on out-of-limit, allowing the host to sleep until a fault occurs. The MAX1362 architecture pairs a charge-redistribution DAC with on-chip input sample-and-hold. With a 10 ms per-channel wake-and-convert budget, the part draws roughly 436 µA in monitor mode, extending battery life on supervisory rails. The integrated reference saves board real-estate versus discrete ADR01/ADR02 designs, at the price of fixed scale. Common deployments are server-board voltage/temperature supervision, telecom power-shelf monitoring, industrial PLC analog front-ends, and battery-stack cell voltage tracking. The interrupt-driven window comparator makes the device particularly attractive where the host controller cannot continuously service conversions. When laying out the MAX1362MEUB+T, place the 0.1 µF VDD bypass within 5 mm of pin 10 and use a Kelvin-sense trace pair for each analog input to reject IR drop in the ground return; the internal reference does not require an external buffer but the analog ground must be a star connected back to the GND pin (pin 9). This page combines verified distributor pricing, drop-in cross-references drawn from the official Maxim datasheet family, and field-application design notes that go beyond the standard pin description table.
MAX1363MEUB+ - 12-Bit 4-Ch 133ksps ADC | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX1363MEUB+ is a 12-bit, 4-channel, low-power successive-approximation-register (SAR) analog-to-digital converter (ADC) with integrated programmable window comparator and SMBus Alert response interface, housed in a 10-pin uMAX (10-TFSOP/10-MSOP, 3.00 mm width) package. An ADC (analog-to-digital converter) is a data-acquisition mixed-signal IC that converts real-world analog voltages into discrete digital codes for processing by a microcontroller, DSP, or ASIC. SAR ADCs sample and digitize one input at a time using a successive-approximation register and a precision DAC loop, making them ideal for multiplexed multi-channel systems where low power and deterministic latency matter. The MAX1363 sits in the broader product hierarchy: ADC -> data converter -> data-acquisition IC -> mixed-signal IC -> semiconductor. By integrating a digital window comparator and the SMBus Alert response protocol, the MAX1363 functions as a 4-channel system monitor that can autonomously assert an interrupt when any input falls outside a user-programmed window. Key specifications include a maximum sampling rate of 133 ksps, 2.7 V to 3.6 V single-supply analog/digital operation, an internal 2.048 V reference (the MAX1364 variant uses 4.096 V), and supply current of 660 uA in internal-reference mode or 436 uA in external-reference mode at 133 ksps. The window comparator outputs interrupt via the SMBus Alert line, eliminating host polling and reducing firmware overhead. A 2-wire SMBus-compatible serial interface operates up to 400 kHz. Shutdown current drops to 0.5 uA with the reference disabled, making the part well suited to battery-powered multi-rail monitoring. The SAR architecture with internal auto-calibration yields excellent DC accuracy and high power-supply rejection (PSRR of plus or minus 0.01 LSB/V), enabling the part to ride on noisy system rails. The four analog inputs can be configured as 2 differential or 4 single-ended channels selected via the serial interface, and a dedicated analog-input current-limit protects against sensor faults and ESD transients. Typical applications include 4-rail system-voltage monitoring in servers and networking switches, battery-cell voltage monitoring in battery-management boards, environmental and HVAC sensor interface boards, and SMBus-based interrupt-generating monitoring of temperature and supply voltages in telecom and industrial equipment. The MAX1363's combination of low power, integrated comparator, and SMBus Alert makes it a workhorse for compute platforms that must supervise multiple rails without devoting firmware cycles to constant polling. When designing with the MAX1363, ensure the analog input signals remain within the supply rails and place 0.1 uF decoupling capacitors close to the supply pin. The internal 2.048 V reference allows direct scaling for 4-rail monitoring applications; for designs needing 5 V inputs use the external-reference mode (the MAX1364 variant uses 4.096 V reference for 5 V systems). This page consolidates distributor pricing tiers, drop-in alternative MPNs in the same uMAX-10 footprint, and practical design notes not always present in the manufacturer datasheet, helping procurement and design engineers compare, qualify, and source the MAX1363MEUB+ quickly.
MAX1363MEUB+T - 12-Bit 4-Ch 133ksps SAR ADC | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX1363MEUB+T is a 12-bit, 4-channel, low-power, successive-approximation analog-to-digital converter (ADC) with a 133ksps sampling rate and a 2.048V internal voltage reference, housed in a 10-pin µMAX (uSOP) package. It accepts 2 or 4 single-ended analog inputs and provides a digitally programmable window comparator with SMBus alert response, making it suitable as a 4-channel system monitor that runs autonomously once configured. A successive-approximation register (SAR) ADC is a precision data converter that uses a binary-search algorithm against an internal DAC to resolve an analog input to N-bit accuracy in N conversion clock cycles. ADCs of this type sit in the measurement-and-monitoring tier of the data-converter hierarchy (SAR ADC -> ADC -> data converter -> signal chain IC -> semiconductor). The MAX1363's specific subcategory - a system monitor - adds autonomous threshold comparison and a SMBus alert output, removing the burden of host-polled conversions in supervisory loops. Key features include a factory-trimmed 2.048V internal reference (giving 0.5mV per LSB at 12 bits), ±0.5 LBN integral non-linearity (INL), a single 3V to 3.6V analog supply, low 0.5mA operating supply current, and a programmable window comparator that asserts an interrupt when an input crosses user-configured thresholds. Communication is via a 2-wire SMBus-compatible interface operating up to 400kHz, and the device supports an extended -40°C to +85°C industrial temperature range. The MAX1363 differs from the sibling MAX1364 only in reference voltage (2.048V vs 4.096V); both occupy the same 10-pin µMAX footprint, so a design using the MAX1363 can be re-targeted to higher-voltage inputs by substituting the MAX1364 with no PCB rework. An internal 4MHz oscillator drives successive approximation, and the analog input structure supports true-rail inputs on the AIN pins when properly configured. Typical applications include 12-bit system monitoring with threshold alerting, single-supply data acquisition front-ends, digital panel meters, battery-powered supervisory boards, and SMBus-managed analog sensor interfaces. Because of its alert pin and programmable thresholds, it is especially useful when the host MCU cannot continuously poll each input. When designing with this device, ensure the 2.048V reference accuracy is acceptable for your LSB resolution (0.5mV/LSB) before deciding between the MAX1363 (2.048V) and MAX1364 (4.096V, 1mV/LSB). Note that 10-bit pin-compatible MAX1361/MAX1362 alternates can be used when 12-bit resolution is not required. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
MAX1364MEUB+ - 12-Bit 4-Ch 133ksps ADC with Window Comparator | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1364MEUB+ is a 12-bit, 4-channel, low-power successive-approximation analog-to-digital converter (SAR ADC) that integrates a digitally programmable window comparator and SMBus alert response, housed in a 10-pin microMAX/uSOP package. It delivers a sampling rate of 133 ksps with an input range of 0 to 5.5 V and includes a 4.096 V internal reference, operating from a single 5 V analog supply. The integrated window comparator and SMBus alert function allow it to operate as a system monitor that can autonomously flag over-/under-voltage events without host CPU polling. What is a system-monitor ADC? A system-monitor ADC combines a precision analog-to-digital converter with a programmable threshold comparator and a digital alert interface. This class of ADC belongs to the broader hierarchy of data converters (ADC -> SAR ADC -> monitor ADC -> data acquisition IC -> signal chain IC -> semiconductor). Compared to a standalone SAR ADC, a system monitor offloads threshold detection to hardware, freeing the host MCU from continuous polling and reducing software overhead in supervisory and battery-monitoring designs. Key features include 4 single-ended analog input channels with input range 0 to 5.5 V, 12-bit resolution, 133 ksps throughput, an internal 4.096 V reference, an integrated programmable window comparator, and an SMBus alert response output for interrupt-driven monitoring. The 10-pin microMAX package measures approximately 3 mm x 3 mm, enabling compact designs in space-constrained system-monitor boards. The MAX1364MEUB+ uses a classic charge-redistribution SAR architecture with an input T/H and on-chip reference. Its window comparator is digitally programmable with upper and lower thresholds stored in on-chip registers, and the SMBus alert output implements the SMBALERT response protocol so multiple devices can share a single interrupt line. Quiescent current is kept low to suit always-on monitoring. Typical applications include 12V lead-acid battery monitoring, multi-rail system-health supervision, server/PSU voltage tracking, and standalone threshold/alerting systems. The wide input range also supports industrial 24V bus monitoring when paired with external resistive dividers. When designing with this device, the SMBus alert line requires a pull-up resistor, and the analog inputs benefit from RC anti-alias filtering when monitoring high-impedance or noisy rails.
MAX138EPL+ - 3.5-Digit ADC with LED Drivers | Analog Devices
The Analog Devices MAX138EPL+ is a 3.5-digit dual-slope analog-to-digital converter with an integrated bandgap reference, charge pump, and direct LED display drivers, housed in a 40-pin DIP package. It operates from a single +2.5V to +7V supply, accepts bipolar inputs, and provides direct drive for multiplexed seven-segment LED displays. The device combines a 3.5-digit measurement system with the functions normally requiring separate reference, inversion, and display-driver circuitry. A dual-slope ADC is a type of integrating analog-to-digital converter that measures an unknown input by comparing it against a reference over fixed integration periods. Its architecture is well suited to panel meters, laboratory instruments, and industrial displays because it converts slow or quasi-static input voltages into stable digital counts. Within the broader hierarchy of ADC to data-converter IC to signal-chain IC, the MAX138 combines conversion, voltage-reference, charge-pump, and display-interface functions. The MAX138EPL+ includes several integrated features that simplify a three-and-a-half-digit display design. Its internal bandgap reference supports repeatable measurements without an external precision reference. The charge pump permits bipolar input measurement from a single positive supply, while the direct LED drivers reduce the external circuitry required for common-anode multiplexed displays. The manufacturer lists the MAX138 as a production device in a 3.5-digit ADC family designed for single +2.5V to +7V operation. The MAX138 is a dual-slope converter rather than a high-speed SAR ADC. This makes it appropriate for continuously changing panel-meter readings rather than waveform sampling or high-rate data acquisition. Its integrated display circuitry places it in the LCD and LED driver category at distributors, while its core function remains analog-to-digital conversion. The industrial-temperature option is identified for MAX138EPL+ in distributor technical data. Typical uses include digital panel meters, process-monitoring instruments, laboratory test equipment, temperature-controller displays, weighing-system indicators, and portable measurement products. In these systems, the converter can accept bipolar sensor signals, generate a negative input reference through its charge pump, and update a local LED display without requiring a separate seven-segment driver IC. Designers should verify the exact LCD or LED polarity, digit-drive topology, input ranges, reference accuracy, and timing requirements against the manufacturer datasheet before layout. A 40-pin through-hole DIP package is straightforward to prototype and automate but occupies considerably more board area than a surface-mount alternative. Decoupling, analog-ground routing, and protection of the analog input remain important for stable panel-meter readings. This page consolidates the verified manufacturer specifications, distributor availability, package details, and carefully qualified drop-in comparison options. It also distinguishes verified MAX138-family substitutes from broader functional equivalents so engineers can assess PCB reuse, supply compatibility, display-drive requirements, and production availability without relying on unsupported cross-reference claims.
MAX1393ETB+T - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
The Analog Devices / Maxim Integrated MAX1393ETB+T is a 1.5V to 3.6V, 312.5 ksps, 1-channel true-differential / 2-channel single-ended, 12-bit SAR ADC housed in a 10-pin TDFN (3 mm x 3 mm) package. It features automatic shutdown, fast wake-up, and a high-speed 3-wire serial interface. An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm and an internal capacitive DAC to digitize an analog input one bit at a time per clock cycle. SAR ADCs sit within the broader data-converter hierarchy (ADC -> data converter -> signal chain IC -> mixed-signal semiconductor) and are favored for applications needing moderate resolution at low-to-moderate sampling rates, deterministic conversion latency, and very low power consumption. The MAX1393 distinguishes itself with true-differential input capability in a single-channel configuration (or two single-ended channels), micropower operation suited for battery-powered systems, automatic shutdown between conversions to extend battery life, fast wake-up to resume sampling with minimal latency, and a compact TDFN-10 (3x3 mm) exposed-pad package that simplifies thermal dissipation and PCB layout. It supports an SPI/QSPI/MICROWIRE-compatible serial interface, simplifying connection to most modern microcontrollers and DSPs without bus-parallel pin overhead. Architecturally, the MAX1393 combines a track/hold front-end, a charge-redistribution DAC, a SAR control core, and an internal 2.5V reference option (with external reference override). The SAR conversion cycle completes in approximately 18 clock cycles, with the SCLK / DOUT / CS three-wire bus enabling throughput up to 312.5 ksps at the rated 3V nominal VDD. The integrated reference and true-differential input reduce the external BOM, lowering both cost and PCB area for space-constrained designs. Typical applications include portable and battery-powered instrumentation, sensor signal conditioning (thermistors, strain gauges, RTDs), handheld medical and fitness monitoring devices, industrial process monitoring loops (4-20 mA digitizers), data loggers, and consumer audio front-ends where 12-bit resolution is sufficient. The automatic shutdown feature extends coin-cell runtime in periodic-sampling architectures such as remote telemetry nodes. When designing with the MAX1393, ensure the input signal common-mode voltage is within the supply range and use the exposed pad for thermal relief and low-impedance ground. Add a 0.1 uF decoupling capacitor close to VDD; place the reference capacitor near AVDD/REF as the datasheet recommends for optimal AC performance. This page synthesizes current distributor stock, parametric drop-in alternatives, and design considerations not aggregated in the manufacturer datasheet alone, sourced from Maxim Integrated documentation and Octopart distributor feeds.
MAX1393MTB+T - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
The Maxim Integrated MAX1393MTB+T is a 1.5V to 3.6V, 312.5 ksps, 1-channel true-differential / 2-channel single-ended, 12-bit successive-approximation analog-to-digital converter housed in a 10-pin TDFN-EP (3 mm × 3 mm) package. It combines micropower consumption with an automatic shutdown / fast wake-up cycle and a high-speed SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, making it well suited for battery-powered precision data acquisition. An SAR ADC is a successive-approximation-register converter that performs a binary search against the analog signal using an internal DAC and comparator. Each conversion completes in one cycle of the internal clock, producing a deterministic latency and no pipeline delay. SAR ADCs occupy a unique position in the data-converter hierarchy: they sit between sigma-delta (highest resolution, lowest speed) and flash (lowest resolution, highest speed) converters, offering 8-18 bit resolution at 100 ksps to multi-msps sampling rates with very low active power. This makes them the default choice for multiplexed multi-channel low-frequency precision sampling. Key features of the MAX1393MTB+T include 312.5 ksps throughput, true-differential or 2-channel single-ended input multiplexer, automatic shutdown between conversions for extended battery life, and an external reference up to AVDD. The device also integrates a high-bandwidth track-and-hold and a serial interface that supports daisy-chaining of multiple ADCs on a single SPI bus. Architecturally, the MAX1393 uses a capacitive-charge-redistribution DAC array driven by an internal oscillator, with a single-supply LDO generating the internal core rail. The shutdown current is specified in the nanoampere range, allowing duty-cycled sampling for handheld instruments where the ADC wakes, converts, and re-enters shutdown on every host interrupt. Typical applications include portable medical instrumentation (blood-glucose meters, pulse oximeters), 4-20 mA industrial loop transmitters, handheld multimeters, battery fuel-gauges, and sensor-interface front-ends. The wide 1.5 V to 3.6 V supply range supports direct connection to single-cell Li-ion, two-cell alkaline, or 3.3 V digital rails without level shifting. When designing with this part, place the 1 µF AVDD bypass capacitor within 3 mm of the supply pin and keep the analog ground return separate from the digital switching return. Drive CNVST with a clean rising edge from a low-jitter timer or GPIO to minimize aperture uncertainty, especially when digitizing small signals near the 12-bit LSB threshold.
MAX1394ETB+T - 8-Bit 416ksps SAR ADC, 1.5V-3.6V | Maxim Integrated
The Maxim Integrated MAX1394ETB+T is a micropower, 8-bit, 416ksps successive-approximation analog-to-digital converter (SAR ADC) with a serial output, operating from a single 1.5V to 3.6V supply. Housed in a 10-pin TDFN-EP (3mm x 3mm) package with an exposed thermal pad, it offers a 1-channel true-differential / 2-channel single-ended input configuration, automatic shutdown, fast wake-up, and a high-speed 3-wire SPI-/QSPI-/MICROWIRE-compatible serial interface. According to the Maxim datasheet, throughput is up to 416 ksps with very low supply current that drops further in auto-shutdown between conversions, making the part ideal for battery-powered and handheld instruments. An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a sampling ADC architecture that resolves a single input voltage in N clock cycles by successively comparing the input against a binary-weighted DAC. SAR ADCs are valued for low latency, deterministic conversion time, and excellent DC accuracy with no pipeline delay - placing them in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. The MAX1394 family combines a true-differential analog front end with a serial interface to deliver high noise immunity in compact, low-power systems. Key features include a 2.7V (typ) supply current of only 0.5 mA at full 416 ksps, automatic shutdown that drops current to less than 1 microamp between conversions, an integrated input track-and-hold, single-ended or true-differential analog inputs, and a 3-wire serial digital interface compatible with SPI, QSPI, and MICROWIRE. The wide 1.5V to 3.6V supply range lets the part run directly from a single Li-Ion cell or two AA cells. The device is built on a low-power CMOS process with a switched-capacitor charge-redistribution DAC and an input track-and-hold amplifier. The reference voltage can be supplied externally or driven from the supply, while the differential input architecture rejects common-mode noise from motors or RF sources - a useful property in industrial and instrumentation designs. Typical applications include portable data logging, 4 mA-to-20 mA loop-powered sensor transmitters, pen tablets and touch screens, battery-powered instrumentation, isolated industrial monitoring, and consumer measurement devices. The combination of 416 ksps speed, micropower shutdown, and a small TDFN-10 footprint makes the part a strong fit for space-constrained, low-duty-cycle systems. When designing with this ADC, place the 0.1 microfarad supply bypass capacitor as close as possible to the AVDD pin and tie the exposed pad (EP) to analog ground for proper heat and noise dissipation. Choose an external low-noise reference when input DC accuracy is critical, since the ADC has no on-chip precision reference. This page synthesizes distributor pricing, drop-in TDFN-10 alternatives, and practical design notes not found in the manufacturer datasheet.
MAX1394MTB+T - 8-Bit 416ksps SAR ADC | Maxim Integrated
The Maxim Integrated MAX1394MTB+T is an 8-bit, 416 ksps successive-approximation analog-to-digital converter (SAR ADC) with two single-ended (or one true-differential) input channels, housed in a 10-pin TDFN (3x3 mm) exposed-pad package. It operates from a single 1.5 V to 3.6 V supply, drawing only micro-power quiescent current suitable for battery-powered and portable designs. A SAR ADC is a type of data converter that uses a binary-search algorithm implemented with a capacitive charge-redistribution DAC and a single comparator. Each conversion cycle resolves one bit at a time over N clock cycles for an N-bit result. SAR ADCs are valued for their deterministic latency (single-cycle conversion), low power consumption, and excellent DC accuracy compared to sigma-delta or pipelined architectures of similar resolution. The MAX1394MTB+T belongs to the data-acquisition IC category, within the signal-chain family of mixed-signal semiconductor components. Key features include 416 ksps maximum sampling rate, an external reference input for design flexibility, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, true-differential or 2-channel single-ended input, automatic power-down between conversions, and a -40C to +85C industrial operating temperature range. The 10-TDFN package with exposed pad provides low thermal resistance and a compact 3 mm x 3 mm footprint suited to space-constrained PCB designs. The device integrates an input multiplexer, sample-and-hold, and SAR core in a single IC, eliminating the need for external signal-conditioning components. The external reference allows designers to optimize the input dynamic range for transducer scaling, while the SPI-compatible serial output enables direct connection to microcontrollers, DSPs, and FPGAs without parallel data-bus overhead. Typical applications include portable instrumentation, battery-powered sensor monitoring, industrial process control loops, handheld multimeters, and consumer audio metering. The micropower consumption extends battery life in wireless sensor nodes and wearable health devices. When designing with this part, choose the external reference voltage to set the LSB weight and ensure the source impedance is below the datasheet's recommended maximum to avoid gain errors. Place a 0.1 uF bypass capacitor as close as possible to the supply pin and tie the exposed pad to a clean analog ground plane for optimal noise performance. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
MAX1395MTB+T - 10-Bit 357ksps SAR ADC, 2-Ch | Maxim Integrated
The Analog Devices (formerly Maxim Integrated) MAX1395MTB+T is a 10-bit, 357 ksps, successive-approximation-register (SAR) analog-to-digital converter offering two input channels configurable as one true-differential or two single-ended inputs, housed in a 10-pin TDFN (3x3 mm) package. It operates from a single 1.5 V to 3.6 V supply and consumes only 2.7 mW at full speed, with automatic shutdown reducing quiescent current to 1 µA between conversions. A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a comparator, a DAC, and a successive-approximation register to convert an analog input to a digital code one bit at a time, typically within N clock cycles for N-bit resolution. SAR ADCs sit within the broader data-converter family alongside flash, pipeline, sigma-delta, and dual-slope architectures, and are favored for low-latency, low-power, and easy-to-drive applications such as instrumentation, sensor read-out, and precision control loops. The MAX1395 belongs to the Maxim low-power SAR family targeted at battery-powered and portable systems. Key features include 357 ksps throughput, 1.5 V to 3.6 V single-supply operation, 2 µA automatic shutdown mode, an external REF input for ratiometric measurements, a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface, and a true-differential input stage that delivers excellent common-mode noise rejection. The 10-pin TDFN-EP package provides a low thermal resistance path and a compact footprint suitable for space-constrained designs. Internally, the MAX1395 integrates a track-and-hold, comparator, charge-redistribution DAC, and SAR logic, delivering ±1 LSB INL and ±1 LSB DNL with no missing codes. The wide analog input range (0 to VREF for single-ended, ±VREF/2 for true-differential) supports bridge sensors, thermocouples, and other low-level signals without external signal conditioning. Typical applications include portable instrumentation, battery-monitoring front-ends, sensor conditioning for strain gauges and thermistors, patient-monitoring devices, and industrial process-control loops. The differential input stage makes it especially well suited for noisy industrial environments. When designing with this part, place the reference bypass capacitor (typically 0.1 µF) close to pin 7 to minimize reference noise and ensure clean conversions. The SHDN pin allows the host MCU to gate conversions for ultra-low average power in duty-cycled battery applications. This page synthesizes distributor pricing, drop-in alternatives from the same MAX139x family, and practical design notes not found in the manufacturer datasheet.
MAX1396EUB+T - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1396EUB+T is a 12-bit, 312.5 ksps successive-approximation-register (SAR) analog-to-digital converter that operates from a single 1.5V to 3.6V supply and offers pin-selectable 1-channel true-differential or 2-channel single-ended input operation. Housed in a 10-pin µMAX (uMAX-10, package code U10-1) package with gull-wing leads, this micropower serial-output ADC is engineered for space-constrained battery-powered instrumentation. A SAR ADC is a type of analog-to-digital converter that uses a binary-search algorithm against an internal precision DAC to digitize an analog input in N conversion cycles for N-bit resolution. SAR ADCs are valued for low latency, deterministic throughput, and lack of pipeline delay - qualities that distinguish them from sigma-delta ADCs (which trade speed for higher resolution through oversampling) and from flash ADCs (which trade resolution for raw speed). The MAX1396 sits in the SAR family -> ADC -> data converter -> signal chain IC -> semiconductor hierarchy. Key specifications include 312.5 ksps maximum sampling rate, true-differential or dual single-ended input multiplexer (CH0/CH1), an SPI/QSPI/MICROWIRE-compatible serial interface, on-chip track-and-hold, and an internal 2.5V reference. The MAX1396 also integrates a low-power shutdown mode that drops quiescent current to sub-microamp levels for power-constrained applications. The µMAX-10 footprint measures approximately 3.0 mm x 3.0 mm and offers superior thermal and electrical performance over equivalent SO-10 alternatives in handheld designs. Internal calibration and a high-impedance input structure simplify front-end signal conditioning. Typical applications include portable data loggers, handheld multimeters, 4-20 mA loop-powered sensors, battery monitoring systems, isolated sensor front ends, and patient-monitoring bedside devices. The 1.5V minimum supply makes it suitable for single-cell alkaline or NiMH-powered products where the ADC can run directly from a declining battery without a boost converter. When designing with the MAX1396, place a 0.1 µF decoupling capacitor within 5 mm of the VDD pin and keep analog input traces short and guarded to preserve the 12-bit accuracy. The internal reference requires a 1 µF external bypass capacitor for specified noise performance. Always observe the absolute maximum analog input range of VDD + 0.3V to avoid latch-up. This page consolidates distributor pricing, verified drop-in alternatives from the same Maxim/ADI family, and practical SAR-ADC layout notes not collected in the original datasheet.
MAX1396MTB+T - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
The Maxim Integrated MAX1396MTB+T is a 1.5V-to-3.6V, 312.5ksps, 12-bit successive-approximation analog-to-digital converter (SAR ADC) housed in a 10-pin TDFN (HVSON) package. It supports a 1-channel true-differential or 2-channel single-ended input configuration and operates from a single 1.5V to 3.6V supply, drawing only 690uA (typ) at full throughput. An SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm implemented with a sample-and-hold amplifier, comparator, and a capacitive DAC. SAR ADCs sit within the broader hierarchy: ADC -> data converter -> mixed-signal IC. They are prized for low-latency, deterministic conversion - unlike sigma-delta ADCs that require digital filtering and exhibit higher latency, a SAR ADC produces a single conversion result per acquisition cycle, making it well suited to multiplexed data-acquisition and control applications. Key features of the MAX1396MTB+T include an integrated 3.84MHz internal oscillator, automatic power-down between samples (reducing supply current to <1uA at lower conversion rates), and an SPI/QSPI/MICROW-HICROWIRE-compatible serial interface. True-differential input operation simplifies interface to bridge sensors and thermocouples, while the wide 1.5V-to-3.6V supply range suits both lithium-ion and 3.3V digital systems. The device achieves at least 70dB SINAD and operates across the -40C to +85C commercial extended or -55C to +125C military temperature grade (the 'M' grade part). The MAX1396MTB+T utilizes a charge-redistribution capacitive DAC array combined with a high-bandwidth track-and-hold amplifier, achieving 312.5ksps throughput with no pipeline delay. The internal 3.84MHz oscillator eliminates the need for an external clock, and an on-chip reference buffer supports both internal 2.5V reference and external reference modes for system-flexibility. Typical applications include portable battery-powered instrumentation, 4-20mA industrial sensor loops, thermocouple and RTD signal conditioning, programmable logic controller (PLC) analog input cards, and handheld medical monitoring devices. The micropower architecture and automatic shutdown make it ideal for any low-duty-cycle data-acquisition node. When designing with this device, place 0.1uF bypass capacitors as close as possible to the AVDD and DVDD pins. Note that the part enters automatic shutdown at the end of each conversion when CS is held high, reducing idle current to less than 1uA - critical for battery-powered applications. The TDFN-10 package exposes a thermal pad on the underside that should be tied to the analog ground plane for optimal noise rejection. This page synthesizes distributor availability, parametric comparison, and practical design notes specific to the MAX1396MTB+T, complementing the manufacturer datasheet with a cross-brand drop-in view to ease second-source qualification.
MAX1396MUB+ - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
The Maxim Integrated (now Analog Devices) MAX1396MUB+ is a 12-bit, 312.5 ksps, 1-channel true-differential/2-channel single-ended, successive-approximation-register (SAR) analog-to-digital converter housed in a 10-pin µMAX (TSSOP-10 equivalent) surface-mount package. It operates from a single 1.5V to 3.6V analog supply, drawing only 428 µA (typ) at full speed, and integrates a true-differential analog input with input protection up to ±6V. A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a sampling ADC architecture that performs one bit-trial per clock cycle, combining a precision DAC with a comparator and SAR register to resolve an analog input into an N-bit code within N cycles. Compared with delta-sigma or pipeline ADCs, SAR converters offer deterministic latency, low power dissipation, and excellent dynamic performance at moderate sampling rates, making them the dominant topology for multiplexed data-acquisition front ends, industrial sensors, and battery-powered instrumentation. The MAX1396MUB+ features automatic channel scanning, an SPI-/QSPI-/MICROWIRE-compatible serial interface, and on-chip 4.096V internal reference. Its ±6V fault-protected analog inputs survive transients well beyond the supply rails, an important property for industrial sensors exposed to wiring faults. The internal reference eliminates external reference cost while maintaining 1 LSB INL and 1 LSB DNL (max) linearity. Typical applications include portable data loggers, medical instrumentation (glucose meters, blood-pressure monitors), 4-20 mA loop-powered sensor transmitters, and battery-powered multimeters. The MAX1396's automatic power-down between conversions reduces average supply current to 1.4 µA at low throughput, extending battery life in duty-cycled designs. When designing with the MAX1396MUB+, place the 0.1 µF input/output bypass capacitors as close to the IC pins as possible. The internal reference requires a 4.7 µF external bypass capacitor; insufficient decoupling will degrade linearity. The serial interface timing must respect the 40 ns minimum SCLK period; high-speed microcontrollers should verify timing margins with the SPI peripheral configured in CPOL=0, CPHA=0 mode. This page synthesizes distributor pricing, same-family drop-in variants, and practical design notes that complement, but do not replace, the manufacturer datasheet. Engineers comparing the MAX1396MUB+ against the MAX1393 (single-ended only) or the MAX1396ETB (10-pin TDFN) will find parameter-by-parameter guidance and PCB-footprint compatibility analysis in the sections below.
MAX1396MUB+T - 12-Bit 312.5ksps SAR ADCSPI
The Analog Devices (formerly Maxim Integrated) MAX1396MUB+T is a micropower, 12-bit, 312.5 ksps successive-approximation analog-to-digital converter (SAR ADC) with a serial SPI/QSPI/MICROWIRE-compatible interface, offered in a 10-pin TDFN-EP (3 mm x 3 mm) package with an exposed thermal pad. The device operates from a single 1.5 V to 3.6 V supply, draws only 437 uA (typ) at full sampling rate, and supports both a single-ended 2-channel input mux and a true-differential 1-channel input mode selected by software. The integrated 1.5 MHz internal oscillator and on-chip track-and-hold eliminate the need for external timing components, simplifying low-power sensor and instrumentation designs. A SAR (Successive Approximation Register) ADC is a precision converter that performs bit-by-bit comparison against a high-accuracy internal DAC to digitize an analog input in N clock cycles, where N is the resolution. SAR ADCs occupy the middle of the speed-versus-precision trade-off space: faster than integrating or delta-sigma converters at moderate resolution, but slower than flash or pipeline architectures. They are widely used in industrial process control, multi-channel data acquisition modules, portable medical instruments, and battery-powered sensor conditioning because they require no warm-up time and consume essentially no quiescent current between conversions. SAR ADCs sit within the broader data-converter IC family, which also includes flash, pipeline, and sigma-delta architectures. The MAX1396's 312.5 ksps throughput, ±1 LSB INL and DNL, true-differential input, and 1.5 V minimum supply enable direct connection to low-voltage sensor bridges, thermocouples, and battery stacks. The on-chip 2.5 V reference (MAX1396 variant) reduces external parts count, while automatic power-down between conversions lowers average supply current to microampere levels in duty-cycled applications. The wide ±16 V input range (with appropriate input protection) and small TDFN footprint suit portable instrumentation. Typical applications include battery-powered sensor signal chains, portable medical monitors, industrial process-control loops, handheld multimeters, and 4-20 mA loop-powered transmitters. The wide supply tolerance also makes the device compatible with 1.8 V, 2.5 V, and 3.3 V microcontroller rails. Designers should note that the exposed pad must be soldered to the ground plane for thermal dissipation and low-impedance reference return; omitting it can degrade noise performance and INL by several LSBs.
MAX139CPL+ - 3.5-Digit ADC with LED Drivers | Analog Devices
The Analog Devices MAX139CPL+ is a 3.5-digit dual-slope analog-to-digital converter with an internal reference, charge pump, direct LED drivers, and one measurement channel, housed in a 40-pin PDIP package. It operates from a single +2.5V to +7V supply, accepts bipolar inputs, and is designed for precision digital panel-meter and LED-display applications. An ADC converts an analog input voltage into a numeric value for measurement, display, or control. The MAX139 belongs to the dual-slope ADC family within the broader ADC/DAC and integrated-circuit hierarchy. Dual-slope conversion is useful when stable, repeatable readings are more important than very high conversion speed, particularly in panel meters where input noise and reference accuracy directly affect the displayed result. Key features include 3.5-digit resolution, an internal reference, an integrated charge pump, and direct LED drivers. The direct-driver outputs reduce the external circuitry needed to illuminate a multiplexed or segmented numeric display. Operating from +2.5V to +7V also allows the converter to fit systems that cannot provide the higher supply voltage associated with many older display-driver designs. The device accepts bipolar input signals, supporting measurement systems in which the sensed voltage may cross a defined midpoint. The architecture combines a dual-slope conversion process with the MAX139 family’s integrated display support. Its internal reference and charge pump support the converter’s measurement and display functions, while the direct LED-driver outputs are intended to reduce system complexity. The Analog Devices product page identifies the MAX139 as a production device and lists a Data Sheet, Rev. 2, together with a product-selection table for family members. Typical uses include digital panel meters, laboratory and bench instrumentation, industrial process readouts, laboratory equipment, weighing or counting displays, and compact embedded measurement panels. The combination of a 2.5V-to-7V supply range and direct LED drivers is especially useful where a numeric indication must be produced without a separate display-driver IC. When designing a new board, verify the complete pinout, recommended input and reference network, LED current limits, bypass-capacitor requirements, and maximum input conditions against the manufacturer data sheet before layout is released. MAX139CPL+, MAX139CPL, and MAX139EPL-family variants use the same 40-pin PDIP format, but temperature grade, lead-free status, and electrical details must be checked rather than inferred from the suffix. This page consolidates verified manufacturer and distributor information, package details, pricing, family alternatives, and application guidance. It adds selection context beyond a distributor listing while clearly identifying parameter values that still require confirmation from the manufacturer documentation.
MAX1400CAI - 18-Bit Sigma-Delta ADC, 28-SSOP | Maxim
The Maxim MAX1400CAI is a +5V, 18-bit, low-power, multichannel, oversampling sigma-delta analog-to-digital converter (ADC) housed in a 28-pin SSOP package. It delivers true 16-bit accuracy through a sigma-delta modulator followed by a digital decimation filter, supports 3 differential or 5 single-ended input channels, and provides a 4.8 kSPS maximum conversion rate with a serial SPI-compatible output. The MAX1400CAI serves applications requiring high-resolution measurement in industrial and instrumentation systems. A sigma-delta ADC is a type of oversampling converter that trades speed for resolution by sampling the input at a much higher rate than the Nyquist frequency and using noise-shaping to push quantization noise out of the baseband. It then decimates the high-rate bitstream into a low-rate, high-resolution code. Within the converter family hierarchy, the MAX1400CAI sits between general-purpose successive-approximation register (SAR) ADCs (faster but lower resolution) and higher-channel-count delta-sigma audio converters. As a data converter, it belongs to the broader category of mixed-signal ICs within power-management-adjacent signal-chain semiconductors. Key features of the MAX1400CAI include 18-bit resolution with no missing codes, a +5V analog supply (with +3V to +5V digital interface compatibility), low quiescent power consumption suitable for battery-powered and loop-powered designs, an integrated digital filter, and a flexible serial interface. Programmable gain and self-calibration further enhance accuracy across the input range. The 28-pin SSOP package offers a compact surface-mount footprint suitable for high-density PCB designs. Technically, the device uses a second-order sigma-delta modulator followed by a digital SINC3 decimation filter to provide simultaneous 50Hz/60Hz rejection. Internal programmable-gain amplifier (PGA) stages support gains up to 16x. The architecture achieves 16-bit effective resolution while remaining simple to interface with microcontrollers via its SPI/QSPI/MICROWIRE-compatible serial port. Typical applications include industrial process control, weigh scales, portable instrumentation, temperature monitoring with RTD/thermocouple front ends, and smart sensor signal conditioning. Its low power and 50Hz/60Hz simultaneous rejection make it ideal for line-frequency industrial environments. When designing with the MAX1400CAI, route analog and digital grounds separately and join them at a single point near the ADC. Use a low-noise precision voltage reference for absolute-accuracy applications. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
MAX1400EAI - 18-Bit Sigma-Delta ADC, 28-SSOP | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX1400EAI is a +5V, 18-bit, low-power, multichannel, oversampling sigma-delta analog-to-digital converter housed in a 28-pin SSOP package. It integrates a sigma-delta modulator with a digital decimation filter to deliver true 16-bit accuracy at up to 480 sps output data rate, while supporting three differential or five single-ended input channels via an analog front-end multiplexer. A sigma-delta ADC is a type of oversampling converter that trades converter speed for very high resolution and excellent noise immunity. By sampling at many times the Nyquist rate and then digitally filtering (decimating) the bitstream, the architecture pushes quantization noise out of the low-frequency band where measurement signals live. This category sits within the broader hierarchy: ADC -> data converter -> data acquisition IC -> signal chain -> mixed-signal semiconductor. Key features of the MAX1400EAI include user-selectable decimation factor, an SPI/QSPI/MICROWIRE-compatible serial interface, on-chip PGA with gain up to 128, programmable current sources for sensor excitation, and a low 1.7 mA typical operating current from a single +5V supply. Internal calibration registers trim offset and gain at any data rate, removing the need for external trimming potentiometers in precision systems. The device is built on a low-power CMOS process and includes a digital comparator, on-chip oscillator, and flexible input multiplexer that lets engineers configure any channel as differential, single-ended, or even as a current input for 4-20 mA loops. The combination of integrated excitation current sources and high PGA gain makes it particularly well suited to direct bridge-sensor digitization without front-end instrumentation amplifiers. Typical applications include industrial process-control loops (4-20 mA, RTD, thermocouple), weigh scales and load-cell signal conditioning, portable and battery-powered instrumentation, smart sensor transmitters, and medical monitoring devices. The wide input range and integrated PGA simplify designs that previously required dedicated analog signal conditioning. When designing with this part, plan the input common-mode and PGA gain trade-off carefully: PGA gains above 32 reduce the absolute input common-mode range, so refer to the input specifications section of the manufacturer datasheet when configuring high-gain differential measurements. Place the reference bypass capacitor close to the REF pin to avoid conversion gain errors. This page synthesizes distributor pricing, drop-in alternatives, comparison parameters, and practical design notes that are not aggregated on any single manufacturer page, giving procurement and design engineers one place to evaluate the MAX1400EAI for new designs and second-source qualification.
MAX1401EAI - 18-Bit Sigma-Delta ADC, 28-SSOP | Maxim Integrated
The Maxim Integrated MAX1401EAI is an 18-bit, low-power, multichannel, oversampling sigma-delta analog-to-digital converter (ADC) housed in a 28-pin SSOP package and specified for industrial temperature operation. According to the Maxim datasheet, the device integrates a sigma-delta modulator with a digital decimation filter that delivers true 16-bit accuracy with no missing codes at 480 sps, and supports a maximum output rate of 4.8 ksps at reduced resolution. The +3V supply operation, 250 uA operating quiescent current, and 2 uA power-down current make it well suited to loop-powered and battery-fed sensor acquisition. A sigma-delta ADC is a converter topology that oversamples the input signal at many times the Nyquist rate and shapes quantization noise out of the signal band, allowing the use of simple 1-bit hardware with extensive digital filtering to extract high effective resolution at low input bandwidth. Within the broader signal-chain taxonomy, the sigma-delta converter sits between successive-approximation register (SAR) and dual-slope integrating converters: it trades conversion speed for resolution, noise immunity, and excellent rejection of 50 Hz / 60 Hz mains interference, which makes the part family a natural fit for instrumentation, weigh-scale, and process-control front ends rather than audio or wideband data acquisition. Key features of the MAX1401EAI include three fully differential or five pseudo-differential input channels multiplexed into a single conversion core, access to the multiplexer output and ADC input for external signal conditioning or calibration injection, on-chip excitation current sources, calibration registers, and a low-drift on-chip reference operating at 1.25 V. Integrated digital functions include a 3-wire SPI-/QSPI-/MICROWIRE-compatible serial interface, user-selectable decimation factors (effectively controlling the resolution-versus-rate tradeoff), and configurable input clocking. Application highlights include weigh scales and load-cell signal conditioning where the integrated excitation source simplifies the front end, thermocouple and RTD temperature measurement systems requiring high noise rejection, industrial process control with 4-20 mA loop input conditioning, loop-powered 4-20 mA smart transmitters, and battery monitoring front ends. Access to the MUX output enables ratiometric measurement topologies that cancel reference and excitation drift. This part is marked as Last Time Buy in many channels; designers should confirm lifecycle before new designs.