ADC/DAC
Productos (2518)
MAX122ACNG - 500ksps 12-Bit ADC with T/H | Maxim Integrated DIP-24
The Maxim Integrated MAX122ACNG is a 12-bit, 500 ksps successive-approximation analog-to-digital converter (ADC) that integrates an on-chip track-and-hold (T/H), a low-drift internal voltage reference, and a parallel digital interface in a single 24-pin PDIP through-hole package. It is a BiCMOS, complete-data-acquisition system-on-chip designed for high-speed, low-power precision conversion in industrial, instrumentation, and DSP-driven applications. An SAR (successive-approximation register) ADC is a sampling architecture that uses a comparator, an internal DAC, and a successive-approximation register to resolve the analog input into N-bit digital codes in N clock cycles. SAR ADCs offer deterministic latency, excellent static linearity, and are well suited for multiplexed-channel data-acquisition systems, motor-control feedback loops, and digital-signal-processing front ends. The MAX122 belongs to the broader category of precision ADCs -> data converters -> signal-chain ICs -> semiconductors. Key specifications include 500 ksps throughput, a 350 ns T/H acquisition time, a 2.46 MHz full-power analog input bandwidth, ±5V bipolar or 0-5V unipolar input range, ±2.5V bipolar input range option, and a low 250 mW typical power dissipation. The device supports both AC and DC specifications with guaranteed no-missing-codes performance and ±0.5 LSB integral nonlinearity (INL) for the A grade. The integrated 2.5V reference has a low ±50 ppm/°C typical temperature drift. Internal architecture uses Maxim's BiCMOS process that places the T/H, reference, clock, and SAR logic on one die, allowing the MAX122 to operate without external precision components. The bus-release and data-access timings are designed to be compatible with most popular microprocessors without inserting wait states, and the chip can also interface directly to a FIFO buffer to virtually eliminate microprocessor interrupt overhead. Power-down mode reduces supply current to under 50 µA for battery-powered and portable applications. Typical applications include data-acquisition systems, DSP analog front ends, digital signal processing front ends, industrial process control, instrumentation, and battery-powered equipment. The wide input range and on-chip reference make the MAX122 equally well suited for transducer signal conditioning in industrial monitoring and as a high-speed front end for DSP-based motor control. In high-end audio and measurement contexts, the deterministic latency simplifies buffer management compared with delta-sigma converters. When designing with the MAX122, ensure that the AV+ and DV+ supplies are decoupled with a 0.1 µF ceramic capacitor placed within a few millimeters of the supply pins, and that the analog and digital grounds are star-connected to maximize noise rejection. If the system requires FIFO buffering, ensure that the RD and CS timings comply with the AC Electrical Characteristics table so that bus contention is avoided during read cycles.
MAX122ACWG - 12-Bit 500ksps ADC | Maxim Integrated | 24-SOIC
The Maxim Integrated MAX122ACWG is a 12-bit successive-approximation analog-to-digital converter (ADC) with a 500 ksps sampling rate, integrated track-and-hold, and internal reference, housed in a 24-pin wide-body SOIC package. It accepts a single analog input channel, operates from a single +5 V analog supply (+5 V or ±5 V digital), and provides a parallel microprocessor-compatible output that can interface directly to FIFOs without wait states in most designs. A successive-approximation ADC is a converter architecture that resolves an analog input one bit per clock cycle using an internal DAC and comparator, achieving high accuracy at moderate sample rates while consuming modest power. The MAX122 belongs to the broader SAR ADC family, which sits between flash ADCs (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest). SAR ADCs are the workhorse of industrial data acquisition, motor control, and instrumentation where deterministic latency and 10-14 bits of effective resolution are required. Key features include 12-bit resolution, 500 ksps maximum throughput, integrated track/hold amplifier, internal 2.5 V bandgap reference, and a low-power shutdown mode that reduces supply current to microamp levels. The device accepts single-ended analog inputs up to +5 V using the internal reference, or bipolar ±5 V inputs with external circuitry. The parallel output interface simplifies memory-mapped connections to standard microcontrollers and DSPs without glue logic. The MAX122ACWG uses a half-flash two-step architecture with on-chip calibration to deliver ±1 LSB integral nonlinearity (INL) and minimal aperture delay. The internal reference is laser-trimmed and buffered, eliminating the need for an external reference in many designs and reducing total BOM cost. The track/hold amplifier features a 4 ns acquisition time, supporting full-scale step inputs on successive conversions without losing codes. Typical applications include industrial process control loops, multi-channel data acquisition systems using an external mux, vibration analysis, sonar/radar signal digitizers, and portable test instruments. The +5 V single-supply operation makes it compatible with legacy industrial backplanes and DSP starter kits. When designing with this part, pay attention to analog and digital ground separation; route the REF decoupling capacitor directly to AGND with a short trace. Enable the shutdown mode via the active-low PD pin between conversion bursts to reduce average current in battery-powered monitoring applications. For best AC performance at high input frequencies, drive the analog input with a low-impedance buffer such as the MAX427 or MAX410. This page synthesizes distributor pricing, drop-in same-package alternatives (MAX120ACWG, MAX122BCWG+, MAX122CWG+), and practical layout notes not always summarized on a single distributor page.
MAX122AEAG - 500ksps 12-Bit SAR ADC with T/H | Maxim Integrated
The Maxim Integrated MAX122AEAG is a 12-bit successive-approximation analog-to-digital converter (ADC) with an on-chip track-and-hold, internal 2.5V bandgap reference, and parallel microprocessor interface, offered in a 24-pin SSOP package. A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm through an internal capacitive DAC network to digitize an input voltage in N clock cycles, where N equals the resolution in bits. SAR ADCs occupy the middle ground between ultra-fast flash converters and slow but precise sigma-delta converters, and they are widely used in data acquisition systems, instrumentation, and industrial control where medium-speed (>100 kSPS) sampling and 8- to 16-bit resolution are sufficient. The MAX122AEAG provides 12-bit resolution with sampling rates up to 500 ksps, making it well suited for high-speed process control and multi-channel scanning applications. Key features of the MAX122AEAG include a typical sampling rate of 333 ksps (500 ksps maximum), ±5V analog input range, internal or external reference capability, low power consumption, and a tri-state parallel output bus that simplifies interface to microprocessors and DSPs. The device operates from a single +5V analog supply and a separate digital supply, allowing analog and digital grounds to be isolated for improved noise immunity. The built-in track-and-hold eliminates the need for an external sample-and-hold amplifier and supports input bandwidths beyond the Nyquist limit of the sampling rate. The MAX122AEAG uses a charge-redistribution DAC core combined with a precision internal comparator and successive-approximation register. The BiCMOS process technology enables low analog power consumption while still providing TTL/CMOS-compatible digital I/O. Reference flexibility is a key architectural feature: designers can use the internal 2.5V reference for cost-sensitive designs, or apply an external reference for applications demanding higher absolute accuracy or lower thermal drift. Typical applications include process control and industrial automation, data acquisition systems, digital signal processing front ends, and automotive sensor signal conditioning where a robust SAR ADC with parallel interface simplifies downstream processing. The 24-SSOP footprint also makes the part attractive for space-constrained designs. When designing with the MAX122AEAG, pay close attention to PCB layout and decoupling: keep analog and digital ground planes separated and joined at a single star ground, place the 0.1µF supply bypass capacitors immediately adjacent to the supply pins, and route the analog input traces over a continuous ground plane to minimize injected switching noise. Source impedance should be kept below a few hundred ohms to avoid conversion errors from incomplete settling through the input sampling capacitor. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on any single manufacturer or distributor page.
MAX122BC/D - 500ksps 12-Bit SAR ADC Die | Maxim Integrated
The Maxim Integrated MAX122BC/D is a 500 ksps, 12-bit successive-approximation analog-to-digital converter (ADC) supplied as a bare die, integrating an on-chip track-and-hold amplifier, a buried-zener low-drift voltage reference, and a BiCMOS conversion engine in a single 24-terminal unpackaged die form factor. The /D suffix indicates this is the die (unpackaged) version of the MAX122, intended for hybrid module assembly and custom hermetic packaging rather than conventional PCB reflow soldering. The MAX122BC variant operates over the commercial temperature range of 0C to +70C with 12-bit linearity, while the parallel interface delivers conversion results in a single read cycle. An ADC (analog-to-digital converter) is a data-acquisition mixed-signal IC that samples continuous analog input voltages and converts them into discrete digital codes at a defined sample rate. SAR (Successive Approximation Register) ADCs sit in the middle of the speed-resolution envelope, offering 8-16 bit accuracy at sample rates from tens of ksps to several Msps, making them the workhorse for industrial process control, instrumentation, and DSP front-ends. The MAX122BC/D fits within the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Its integrated reference and track/hold shorten the analog signal chain to a single IC, eliminating the layout and noise pitfalls of a discrete SAR plus external reference plus external T/H design. Key specifications include a 500 ksps maximum sample rate, 350 ns track/hold acquisition time, 12-bit no-missing-codes resolution, and a built-in 2.5 V low-drift reference. The BiCMOS process combines bipolar front-end accuracy with CMOS digital logic for low power consumption (typically 70 mW at full speed). Parallel output bus and byte-organized read modes simplify connection to most popular microprocessors without wait states, and a FIFO-buffered interface mode minimizes microprocessor interrupt overhead in continuous-acquisition systems. Typical applications for the MAX122BC/D include digital signal processing front-ends, audio-bandwidth data acquisition, speech-recognition subsystems, and high-speed industrial process control where die-level integration enables ruggedized or miniaturized modules. The internal reference and T/H eliminate many external components, but careful attention to PCB ground planes and analog/digital isolation is required to realize the full 12-bit accuracy, particularly in the unpackaged die variant where bond-wire inductance and die-pad capacitance dominate high-frequency behavior. Engineers should treat the /D (die) form factor as a specialty hybrid-assembly part: bond-out diagrams, die pad coordinates, and ESD handling protocols must be sourced from the manufacturer datasheet before any assembly run. Sampling window and acquisition time trade-offs apply as with any SAR ADC - reducing clock rate or adding a front-end buffer amplifier relaxes the input drive requirements but increases aperture uncertainty. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not consolidated in the manufacturer datasheet.
MAX1230ACEG+ - 12-Bit 300ksps 16-Ch ADC with FIFO | Maxim Integrated
The Maxim Integrated MAX1230ACEG+ is a 12-bit, 300ksps, 16-channel successive-approximation analog-to-digital converter (SAR ADC) with an internal 4.096V reference, an internal temperature sensor, and a 16-entry FIFO, housed in a 24-pin QSOP package. It accepts either 8 single-ended or 16 differential analog inputs and operates from a single +5V analog supply, drawing only a few milliamps during conversion. An ADC is a mixed-signal integrated circuit that converts real-world analog voltages into discrete digital codes. The MAX1230 belongs to the successive-approximation register (SAR) ADC family, which trades raw speed for high accuracy and low power consumption. Within the broader component taxonomy, SAR ADCs sit beneath data converters, which themselves are a subset of mixed-signal ICs and ultimately semiconductor devices used for precision instrumentation and embedded system design. The MAX1230ACEG+ integrates several blocks normally external to a basic ADC: a true-differential input multiplexer (8 single-ended or 16 differential channels), a low-drift internal reference, a ±1°C internal temperature sensor, a 16-entry First-In/First-Out buffer, configurable scan-mode sequencing, internal averaging, and a power-saving AutoShutdown mode that drops supply current between conversions. The on-chip FIFO lets a host controller sleep while multiple conversions accumulate, easing firmware timing constraints. A 10MHz SPI/QSPI/MICROWIRE-compatible serial interface streams data out without gluing logic to the host bus. Typical applications span industrial process control loops, multi-channel data-acquisition front-ends, battery-cell monitoring and stack voltage measurement, portable and rack-mounted instrumentation, and embedded sensor hubs that also need on-board temperature compensation. The internal temperature sensor eliminates an external thermistor or remote diode in chassis-monitoring designs. For low-power systems, AutoShutdown and scan-mode combine to let the part sip quiescent current while sweeping many channels. When designing with this device, budget for an external 0.1µF bypass capacitor close to the supply pin and a 10µF reservoir on the reference pin to preserve linearity at full 300ksps throughput. Choose between single-ended and differential input modes based on the common-mode range of the upstream signal conditioning; the integrated input mux is software-configurable, so no hardware changes are required to switch between 8 SE or 16 DIFF channels. This page consolidates manufacturer datasheet specifications, current distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the datasheet to help engineers select and qualify the MAX1230ACEG+ quickly.
MAX1230ACEG+T - 12-Bit 300ksps SAR ADC w/ FIFO & Temp Sensor | ADI
The Analog Devices (formerly Maxim Integrated) MAX1230ACEG+T is a 12-bit, 300 ksps successive-approximation analog-to-digital converter with 12 analog input channels (configurable as 8 single-ended/16 pseudo-differential inputs), an internal 4.096V reference, an internal temperature sensor with +/-1 degree C accuracy, a 16-entry FIFO, scan mode, internal averaging, and AutoShutdown, housed in a 24-pin QSOP package. An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that converts an analog input signal into a digital output code through a binary search algorithm using an internal DAC and comparator. SAR ADCs sit in the data-converter hierarchy alongside sigma-delta and pipeline ADCs, offering an attractive trade-off between sample rate, resolution, and power consumption. The MAX1230 belongs to the data-acquisition IC family, used wherever multiple analog channels must be digitized at moderate speeds with deterministic latency. Key features of the MAX1230ACEG+T include a 300 ksps maximum sample rate through its SPI/QSPI/MICROWIRE-compatible serial interface, true-differential analog multiplexer with software-configurable input ranges (unipolar 0-VREF or bipolar +/-VREF), 16-entry FIFO for reducing host-processor interrupt overhead, and an internal temperature sensor that removes the need for an external thermal-monitoring part. The integrated 4.096 V reference simplifies BOM and the AutoShutdown feature drops supply current to microampere levels between conversions to extend battery life in portable equipment. Typical applications include 4-20 mA industrial sensor digitizers, multi-channel data-acquisition front-ends for process control, portable battery-powered instrumentation, system-health monitoring using the on-die temperature sensor, and distributed I/O modules. The 16-entry FIFO enables the host microcontroller to sleep between bursts of conversions, making the part well suited to power-constrained IoT edge devices. When designing with this device, ensure the input common-mode voltage stays within the analog multiplexer ratings and place the 1 nF reference bypass capacitor as close as possible to the REF pin. The internal temperature sensor is calibrated at 25 degree C, so thermal-proximity to external heat sources will degrade accuracy; isolate the die thermally for high-precision measurements.
MAX1231ACEG+ - 12-Bit 300ksps 16-Ch SAR ADC | Maxim Integrated
The Maxim Integrated (now Analog Devices) MAX1231ACEG+ is a 12-bit, 300 ksps, 16-channel successive-approximation analog-to-digital converter (SAR ADC) with an internal 2.5V reference, an internal FIFO, and an on-die temperature sensor, housed in a 24-pin QSOP (EG) package. The part operates from a 3.0V to 3.6V analog supply and a 2.7V to VAVDD digital supply, with a 300 kHz conversion rate and 8/16 selectable analog input channels. An SAR ADC is a type of data converter that uses a binary-search successive-approximation algorithm to digitize an analog input voltage within one conversion cycle. The MAX1231 belongs to the data-acquisition IC family, which itself sits in the broader analog-to-digital converter hierarchy under signal chain and data conversion. SAR ADCs are favored over delta-sigma converters in multiplexed applications because they offer low latency, deterministic throughput, and excellent DC accuracy without the digital filtering delay of oversampling architectures. Key features of the MAX1231ACEG+ include an internal FIFO that allows up to 16 conversion results to be stored before servicing interrupts, an internal temperature sensor that returns die temperature with 1°C accuracy, an internal 2.5V reference (with optional external reference override), single-ended or pseudo-differential input modes, and a high-speed SPI/QSPI/MICROWIRE-compatible serial interface. The device supports software-configurable analog inputs (8 single-ended or 16 inputs in scan mode) and provides programmable scan averaging (1, 2, 4, 8, 16, 32, 64, or 128 samples). Architecturally, the MAX1231 uses a capacitive charge-redistribution DAC and an input track-and-hold, which gives true 12-bit linearity (INL and DNL both below ±1 LSB max) and low aperture delay. An integrated input-protection clamp allows the inputs to tolerate ±6V fault voltages without latch-up, simplifying connection to industrial sensor networks where transients are common. The internal reference and FIFO reduce host-side overhead, allowing a low-cost microcontroller to manage up to 16 analog channels with minimal bus traffic. Typical applications for the MAX1231ACEG+ include industrial process control and monitoring, multichannel data-acquisition systems, temperature-compensated sensor front ends, HVAC controls, battery-cell monitoring, and rack-mounted instrumentation. The wide analog input range, internal reference, and integrated temperature channel are particularly useful in distributed I/O modules. When designing with this ADC, ensure adequate decoupling on both AVDD and DVDD pins (typically a 10 µF bulk plus a 0.1 µF ceramic) and place the bypass capacitor on the REF pin within 5 mm of the REF pin to preserve reference stability. The serial-interface clock can run up to 10 MHz in SPI mode 0, but the 300 ksps throughput ceiling must be respected by timing the SCLK bursts accordingly. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including a pinout reference and parametric comparison against same-family Maxim and Analog Devices 12-bit ADC options.
MAX1231ACEG+T - 12-Bit 300ksps ADC, 16-Ch, FIFO, QSOP-24 | ADI
The Analog Devices (formerly Maxim Integrated) MAX1231ACEG+T is a low-power, 12-bit, 300 ksps, serial-output, multi-channel successive-approximation analog-to-digital converter (ADC) with an internal 2.5 V reference, an internal ±1 °C accuracy temperature sensor, and a 16-entry first-in/first-out (FIFO) buffer, housed in a 24-pin QSOP package. It accepts 8 or 16 single-ended analog inputs (or 4 or 8 true-differential pairs) through an analog multiplexer and converts them to a 12-bit serial result at up to 300,000 samples per second. An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm with an internal DAC and comparator to digitize an analog input in N conversion cycles for N bits of resolution. SAR ADCs offer deterministic latency, no pipeline delay, excellent DC accuracy, and are well-suited for multiplexed multi-channel data acquisition at moderate speeds, sitting in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Key features of the MAX1231ACEG+T include 300 ksps throughput, an internal 2.5V reference (4.096V on the B-grade), ±1 °C internal temperature sensor accuracy, a 16-entry FIFO for host offload, SPI/QSPI/MICROWIRE-compatible serial interface, 3 V or 3.3 V single-supply operation, low 1.6 mA (typ) operating current, software-configurable unipolar/bipolar and single-ended/differential input ranges (0 to VREF, ±VREF, 0 to 2×VREF, ±2×VREF), and QSOP-24 footprint. The FIFO allows the part to capture bursts while the host processor is busy with other tasks. The architecture combines a low-charge-distribution input T/H with a precision SAR core, an internal bandgap-derived reference, and a digital serial engine that supports daisy-chaining of multiple MAX1227/MAX1229/MAX1231 devices on a single SPI bus. The analog inputs can be configured as 8 single-ended channels (A-com version), 16 single-ended channels (B/C versions), or as differential pairs, and the internal temperature sensor die measurement simplifies system thermal monitoring. Typical applications include industrial process control and data acquisition, system health monitoring with on-die temperature sensing, multichannel instrumentation, battery-powered portable data loggers, factory automation sensor interfaces, and medical patient monitoring front ends. The FIFO and channel-scan modes simplify firmware by offloading periodic scan housekeeping from the host MCU. When designing with this device, ensure that the analog input signals remain within the absolute maximum ratings (GND - 0.3 V to VDD + 0.3 V), use the recommended 0.1 µF ceramic bypass capacitor on VDD placed within 5 mm of the pin, and configure the serial-interface clock polarity/phase to match the host controller. Unused analog inputs should be tied to a defined mid-supply voltage to minimize crosstalk. This page synthesizes distributor pricing, pin-compatible same-family Maxim drop-in alternatives, and practical design notes that are not available in the standalone manufacturer datasheet, including FIFO mode configuration guidance and SPI daisy-chain wiring tips.
MAX1231AEEG+ - 12-Bit 300ksps 16-Ch ADC w/FIFO & Temp Sensor
The Analog Devices (formerly Maxim Integrated) MAX1231AEEG+ is a 12-bit resolution, 300 ksps, low-power, serial-output, multi-channel analog-to-digital converter (ADC) with an internal 4.096V reference and integrated temperature sensor, housed in a 24-pin QSOP package. The device supports 8 or 16 single-ended analog input channels (or 4 or 8 differential pairs) and operates from a single 3.0V to 3.6V analog supply with a separate 3.0V to 5.5V digital supply for flexible interfacing with 1.8V to 5V logic. An ADC (Analog-to-Digital Converter) of this type belongs to the successive-approximation-register (SAR) converter family, which sits within the broader data-converter hierarchy under mixed-signal integrated circuits. SAR ADCs sample the input track with a sample-and-hold amplifier and then perform a binary search through an internal DAC to determine each bit. They are prized for deterministic latency, low power consumption at modest sampling rates, and the absence of pipeline delay - making them ideal for multiplexed multi-channel data-acquisition systems. Key features include 300 kilosamples per second throughput, an internal FIFO with programmable depth, an internal temperature sensor readable via the same serial interface, a 4.096V internal reference, and an SPI/QSPI/MICROWIRE-compatible serial interface. The part also integrates a 16-entry channel-scan table, configurable single-ended or differential inputs, and software-configurable unipolar/bipolar input ranges. Typical applications include portable and battery-powered data acquisition, process control and industrial automation, temperature monitoring with the on-die sensor, patient monitoring and medical instrumentation, and remote-sensor data logging. The 24-pin QSOP footprint keeps board area minimal while supporting up to 16 analog channels. When laying out a PCB with the MAX1231AEEG+, place the 0.1 microfarad decoupling capacitors as close as possible to AVDD and DVDD pins and provide a solid ground plane directly under the device. The analog and digital ground pins should be tied at a single star point near the IC. Avoid routing digital signals beneath the analog input traces to prevent digital switching noise from coupling into the ADC front end. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes beyond what is in the Maxim datasheet, including a quantified channel-count and supply-rail comparison versus competing pin-compatible ADCs such as the MAX1229 and MAX1227.
MAX1231AEEG+T - 12-Bit 300ksps ADC, FIFO, Temp Sensor, SSOP-24 | Maxim
The Maxim Integrated (now Analog Devices) MAX1231AEEG+T is a 12-bit, 300 ksps successive-approximation analog-to-digital converter (ADC) with an internal 4.096 V reference, an internal temperature sensor (±1°C accuracy), and a 16-entry First-In/First-Out (FIFO) buffer, housed in a 24-pin SSOP package. It operates from a single +3.0 V to +3.6 V analog supply and a +1.7 V to +3.6 V digital supply, making it suitable for 3.3 V mixed-signal systems. What is a successive-approximation ADC? A SAR ADC is a type of analog-to-digital converter that uses a binary-search algorithm and a precision DAC to convert an analog input to a digital code one bit at a time per clock cycle. SAR ADCs sit in the converter hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They are favored over delta-sigma converters where low latency, deterministic sampling, and high absolute accuracy at moderate resolutions (10-16 bit) are required, such as in industrial process control and sensor monitoring. Key features include 12-bit resolution with no missing codes, ±1 LSB INL (max), an analog multiplexer supporting 8 single-ended or 4 pseudo-differential inputs (channel count varies by family member: MAX1227 has 8, MAX1229 has 12, MAX1231 has 16), SPI/QSPI/MICROWIRE-compatible serial interface, and a hardware shutdown mode that drops supply current to under 1 µA. The 16-entry FIFO reduces host MCU overhead by allowing block reads of multiple conversions. The MAX1231AEEG+T uses a capacitive charge-redistribution DAC with a precision bandgap reference and an integrated temperature sensor routed through the analog mux, eliminating the need for an external temp-sensing IC. The architecture achieves 300 ksps throughput while consuming only 2.7 mA (typ) active and 1 µA shutdown, making it appropriate for both high-speed data acquisition and power-conscious portable designs. Typical applications include industrial process control, multichannel data acquisition systems, patient monitoring and portable medical instrumentation, factory automation sensor panels, and thermocouple/RTD temperature compensation. Designers choose the MAX1231AEEG+T when they need a complete, calibrated 12-bit acquisition front end with embedded temperature sensing in a small SSOP footprint. When designing with this part, place the 0.1 µF supply bypass capacitors within 5 mm of AVDD and DVDD, and route REF+ to AVDD via a short trace to preserve reference accuracy. Do not exceed the absolute maximum AVDD of 4.2 V or apply analog inputs above AVDD + 0.3 V, as the input ESD structure is not tolerant of over-range. This page synthesizes distributor pricing, drop-in alternatives sourced from the Maxim part family, and practical design notes that are not collated in the manufacturer datasheet.
MAX1236EUA+CHV - 12-Bit 4-Ch I2C ADC, 8-µMAX
The Maxim Integrated MAX1236EUA+CHV is a 12-bit, low-power, 4-channel successive-approximation analog-to-digital converter (SAR ADC) with internal track/hold, voltage reference, clock, and an I2C-compatible 2-wire serial interface, supplied in an 8-pin µMAX package. The device operates from a single analog/digital supply of 2.7V to 3.6V (low-voltage mode) or 4.5V to 5.5V (high-voltage mode) and supports up to 12 single-ended or 6 differential analog input channels selected through software. A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that converts an analog input voltage into a digital code using a binary search algorithm against an internal precision DAC; it occupies the broader hierarchy of data converter -> ADC -> SAR ADC within signal chain semiconductors. SAR ADCs are valued for deterministic latency, low power consumption, and excellent DC accuracy, making them the dominant architecture for multiplexed multi-channel data acquisition in industrial control, instrumentation, and sensor readout subsystems where a single converter services many sensors sequentially. Key features of the MAX1236 include a 4.096V internal reference (MAX1236 variant), a guaranteed 12-bit resolution with no-missing-codes performance, a maximum sampling rate of 94.4 kSPS (8 µs conversion + acquisition), true-differential inputs with software-configurable unipolar/bipolar ranges, and an I2C-compatible serial interface with user-selectable slave addresses. The internal 4.096V reference can be overdriven by an external reference between 1V and VDD for applications requiring absolute accuracy or ratiometric measurement. The MAX1236 architecture combines a precision charge-redistribution DAC, an input track/hold that settles to 12 bits in less than 1.5 µs, and a digital comparator running the SAR search algorithm, all clocked from an internal 3 MHz oscillator. The high-impedance analog inputs can tolerate source impedances up to 1.5 kΩ without degrading linearity, and the digital section provides straight-binary (unipolar) or two's-complement (bipolar) output codes. Typical applications include industrial sensor data acquisition (4-20 mA loop digitization via external resistor), battery-powered handheld instruments, portable medical monitors, PLC analog input modules, HVAC environmental sensors, and consumer audio VU-meter front-ends. The wide supply tolerance lets the same PCB design work at 3.3V or 5V rails without modification. When designing with this device, allocate adequate PCB area for the analog input traces; keep them short and routed away from digital lines and clock edges. Use a single ground plane with the AGND and DGND pins tied together at the device to minimize return-path noise. Average 4 to 16 conversions in firmware to drop effective noise below 1 LSB. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design guidance for MAX1236EUA+CHV that complements the manufacturer datasheet.
MAX1236KEUA+T - 12-Bit 4-Ch SAR ADC | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX1236KEUA+T is a 12-bit, low-power, 4-/12-channel, 2-wire serial (I2C-compatible) successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin µMAX package, supporting input ranges of 2.7V to 3.6V and 4.5V to 5.5V. It integrates an internal track/hold (T/H), internal voltage reference, internal clock, and an I2C-compatible 2-wire serial interface operating up to 400 kHz in fast mode and 1.7 MHz in high-speed mode. The MAX1236KEUA+T features 4 single-ended analog input channels and operates with a maximum sampling rate of approximately 94.4 ksps. An ADC (Analog-to-Digital Converter) is a semiconductor device that converts continuous analog voltage signals into discrete digital codes for processing by microcontrollers, FPGAs, or DSPs. The SAR (Successive Approximation Register) architecture uses a binary search algorithm against an internal DAC to determine each bit in sequence, providing a deterministic conversion time independent of input signal amplitude. The MAX1236 belongs to the SAR ADC sub-family within the broader category of data converters and is one of the smallest pin-count multi-channel SAR ADCs available for embedded sensing applications. Key features include 4 single-ended analog input channels (multiplexed to one ADC core), an internal 2.5V reference, internal track/hold amplifier, internal oscillator eliminating the need for an external crystal, and an automatic power-down mode between conversions that reduces supply current to a few microamps. The I2C-compatible serial interface supports standard mode (100 kHz), fast mode (400 kHz), and high-speed mode (1.7 MHz), and the device includes two slave address options for bus sharing. The MAX1236-MAX1239 family is organized by channel count and input configuration: MAX1236 provides 4 single-ended inputs, MAX1238 provides 12 single-ended inputs, and MAX1237/MAX1239 provide pseudo-differential inputs. The MAX1236KEUA+T variant operates from 2.7V to 3.6V and 4.5V to 5.5V, while the MAX1236LEUA+ operates from 2.7V to 3.6V only, making the K variant more suitable for 5V-tolerant industrial systems. Typical applications include industrial process control sensor monitoring, portable battery-powered data acquisition, handheld instrumentation, 4-20 mA loop-powered transmitters, HVAC sensor interfaces, and consumer equipment monitoring. The combination of low power consumption and small µMAX-8 footprint makes it well-suited for space-constrained designs. When designing with this ADC, place the 0.1 µF bypass capacitor as close as possible to the AVDD pin and route analog and digital grounds to a common star point to minimize digital switching noise coupling into the analog inputs. For best linearity performance, average multiple conversions or oversample when input bandwidth permits. This page synthesizes distributor pricing, drop-in alternatives, and parametric comparisons not consolidated in the manufacturer datasheet alone, providing a single-source reference for design engineers evaluating the MAX1236KEUA+T for low-power multi-channel ADC applications.
MAX1236LEUA+ - 12-Bit, 4-Ch SAR ADC, I2C, 8-uMAX | Maxim
The Maxim Integrated (Analog Devices) MAX1236LEUA+ is a 12-bit, low-power, 4-/12-channel, 2-wire (I2C-compatible) successive-approximation analog-to-digital converter (ADC) in an 8-pin uMAX/uSOP package. Operating from 2.7V to 3.6V or 4.5V to 5.5V supplies, the device integrates an internal track/hold, voltage reference, clock, and I2C-compatible serial interface supporting 400 kHz Fast Mode and 1.7 MHz High-Speed Mode. The MAX1236 variant provides 4 single-ended analog input channels (vs 12 on MAX1237/MAX1238/MAX1239). A successive-approximation register (SAR) ADC is a member of the data-converter family that converts an analog input to a digital code using a binary-search algorithm executed by an internal DAC and comparator. SAR ADCs deliver deterministic latency, no pipeline delay, and excellent DC accuracy for multiplexed multi-channel applications. They sit hierarchically between sigma-delta ADCs (higher resolution, lower speed) and flash ADCs (fastest, lowest resolution), making them the default choice for general-purpose multi-channel 12-bit embedded designs. Key features of the MAX1236LEUA+ include 12-bit resolution, 4 single-ended input channels, low operating current (typically sub-mA during conversions), an internal 2.5V reference, software-configurable unipolar/bipolar input range via the SETUP byte, and an industrial -40C to +85C temperature grade. The 'LEUA' suffix denotes the 8-pin uMAX package and the lead-free/RoHS-compliant finish; the '+' indicates lead-free, RoHS-compliant factory finish. The MAX1236LEUA+ ships in the small 8-pin uMAX footprint, well suited to space-constrained sensor-interface PCBs. Architecture-wise the device pairs a charge-redistribution DAC with a high-performance comparator and on-chip digital control logic. The internal reference and oscillator minimize external component count, and the I2C address is user-programmable through the AD pin, allowing up to four MAX1236-family devices on a single bus. Hardware and software shutdown reduce supply current to microampere levels between conversions for battery-friendly duty-cycled sampling. Typical applications include portable instrumentation, battery-powered sensor data acquisition, multi-cell battery monitoring, thermistor/RTD front ends, PLC analog input cards, and any low-density multi-channel embedded measurement. The 4-channel count fits 3-rail voltage plus current sensing, or 4-channel thermocouple/temperature interfaces. Software-configurable input ranges simplify scaling to industrial 0-10V (with external dividers) and 4-20 mA loops (with external shunt). Design consideration: external input RC filtering on each analog input protects against out-of-band noise and source-impedance-induced gain error. The I2C bus pull-ups must be sized to balance rise time against bus capacitance for the chosen clock rate (100/400 kHz or 1.7 MHz High-Speed Mode). This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the Maxim datasheet alone.
MAX1236LEUA+T - 12-Bit 4-Ch 94ksps SAR ADC I2C | Maxim
The Maxim Integrated MAX1236LEUA+T (Analog Devices Inc./Maxim Integrated) is a 12-bit, low-power, 4-channel successive-approximation analog-to-digital converter (SAR ADC) with internal track/hold, voltage reference, clock, and an I2C-compatible 2-wire serial interface. It operates from a single 4.5V to 5.5V analog supply, delivers up to 94.4 ksps throughput, and dissipates only 670 µA at full sampling rate. The device integrates 4 single-ended or 2 differential analog input channels and is housed in an 8-pin µMAX (uSOP) surface-mount package, supplied here on tape and reel. What is an SAR ADC: A successive-approximation register analog-to-digital converter is a type of low-to-medium speed, medium-resolution data converter that performs a binary search through an internal DAC to digitize an analog input one bit per clock cycle. SAR ADCs sit in the broader taxonomy of data converters (ADC -> data converter -> signal chain -> mixed-signal IC -> semiconductor). They are prized for deterministic latency, no-pipeline delay, excellent DC accuracy, and very low power consumption relative to pipeline or delta-sigma ADCs at similar speeds. Key features include 12-bit resolution with no missing codes, ±1 LSB INL/DNL (max), an internal 2.5V reference (also accepting an external reference), a software-configurable unipolar/bipolar analog input range (0 to VREF or ±VREF), low 1.5 mA power-down current, and a hardware/software shutdown mode that drops quiescent current to microampere levels. The I2C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes, simplifying connection to virtually any modern microcontroller. The MAX1236LEUA+T uses a charge-redistribution DAC architecture with an input track/hold, ensuring accurate sampling of fast-moving signals and providing inherent single-cycle conversion. An on-chip 2.5V bandgap reference is trimmed at final test, eliminating external reference components and reducing BOM cost and board area. The device is specified over the -40°C to +85°C industrial temperature range. Typical applications include portable data acquisition, patient monitoring and medical instrumentation, process control loops, battery-powered sensor reading, plus battery monitoring on 4-cell battery stacks. The integrated reference and small µMAX footprint also suit space-constrained designs where a 4-channel SAR ADC must coexist with a small microcontroller. Design consideration: route the I2C SDA/SCL traces with 4.7 kΩ pull-ups and place a 0.1 µF decoupling capacitor within 5 mm of the AVDD pin; the analog inputs are sample-and-hold based, so adding a small RC (typically 100 Ω + 100 pF) at AIN pins reduces kickback. This page synthesizes distributor pricing, drop-in same-package alternatives, application-specific design notes, and selection guidance that is not present in the bare manufacturer datasheet.
MAX1237EUA+TGA8 - 12-Bit 4-Ch 2-Wire Serial ADC | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX1237EUA+TGA8 is a low-power, 12-bit, 4-/12-channel, 2-wire serial successive-approximation analog-to-digital converter (SAR ADC) with an internal 2.048V reference and an I2C-compatible serial interface. It operates from 2.7V to 3.6V or 4.5V to 5.5V supplies, delivers up to 94.4 ksps throughput, and consumes only 670 uA at maximum sampling rate while dropping below 230 uA in low-power modes. The MAX1237 variant is housed in an 8-pin uMAX (uSOP) package and supports 4 single-ended analog input channels plus the internal reference and an analog supply monitor. A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation register to convert an analog input voltage into a digital code, one bit at a time, in N clock cycles for N-bit resolution. SAR ADCs sit in the broader hierarchy of data-converter ICs (ADC/DAC), themselves a subcategory of signal chain and mixed-signal integrated circuits. They are prized for low latency, deterministic conversion, excellent DC accuracy, and moderate-to-high speed without the pipeline latency of pipelined converters. The MAX1237's internal track/hold, voltage reference, clock, and I2C-compatible 2-wire serial interface integrate the full signal path, simplifying front-end design. Key features include 12-bit resolution, 4 single-ended input channels, an integrated 2.048V reference (1V external reference option for FS range 1V to VDD), hardware-configurable I2C address pins (the MAX1237 variant supports four selectable slave addresses), an end-of-conversion interrupt, and an automatic low-power shutdown between conversions that drops supply current to under 1 uA. The MAX1237 is pin-compatible with the MAX1236 (4.096V internal reference) within the same family, simplifying reference-voltage selection in the same PCB footprint. Typical applications include battery-powered data acquisition systems, portable instrumentation, temperature and sensor signal conditioning (with external signal conditioning), industrial process control loops, digital panel meters, and embedded system analog front-ends where I2C bus connectivity, low power, and small package size are required. Designers frequently pair the MAX1237 with microcontrollers featuring I2C controllers (e.g., MAX32xxx, STM32, or PIC families) to build compact 4-channel monitoring systems. The MAX1237EUA+TGA8 packaging variant is supplied in Tape & Reel packaging and is intended for high-volume manufacturing.
MAX1237KEUA+ - 12-Bit 4-Ch 94.4kSPS 2-Wire ADC | Maxim
The Maxim Integrated (now Analog Devices) MAX1237KEUA+ is a 12-bit, low-power, 4-/12-channel, 2-wire (I2C-compatible) serial analog-to-digital converter (ADC) with internal track/hold, voltage reference, and clock, offered in an 8-pin µMAX (uMAX/uSOP, 3mm) package. The K suffix designates 12 input channels and EUA designates the 8-pin µMAX. The part operates from +2.7V to +3.6V or +4.5V to +5.5V dual-range supplies, draws 133 µA typ at 94.4 ksps, and supports a fast 94.4 ksps throughput. An ADC (Analog-to-Digital Converter) is a data-conversion integrated circuit that samples continuous analog voltages and produces a discrete digital code for processing by a microcontroller or DSP. Successive-approximation register (SAR) ADCs combine low power, deterministic latency, and high accuracy, making them the dominant choice for multiplexed multi-channel sensor acquisition. The MAX1237 belongs to the SAR ADC family, in the hierarchy ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Key features include 12-bit resolution with ±1 LSB INL/DNL (max), an internal 4.096V reference (the K version), single-ended analog inputs from 0 to VREF, an I2C-compatible serial interface with up to 400 kHz clock, software-configurable unipolar/bipolar operation, and a low-power shutdown mode that drops supply current below 1 µA. The internal reference saves external circuitry and improves temperature stability versus an external RA-RA divider. Architecturally, the MAX1237 uses a charge-redistribution SAR core with an input analog multiplexer, an integrated T/H, and an internal bandgap-based reference. The wide supply flexibility (2.7V-3.6V or 4.5V-5.5V) lets it ride directly on 3.3V digital rails or on 5V analog rails, while pin-selectable address bits support up to four devices on one I2C bus. Auto-shutdown between conversions minimizes average current in battery-powered, duty-cycled applications. Typical applications include battery-powered temperature monitoring, 4-20 mA loop process instrumentation, handheld data loggers, PLC analog input modules, and HVAC sensor-front ends. The internal multiplexer (12 channels) eliminates an external analog switch, while the I2C interface reduces microcontroller pin count versus parallel-output ADCs. When designing with the MAX1237, place the 0.1 µF VDD bypass capacitor within 5 mm of the supply pin, route SDA/SCL away from the analog inputs, and use the software-programmable setup register to enable auto-shutdown for standby power budgets below 10 µA. This page synthesizes distributor pricing, drop-in equivalents from the MAX1236/MAX1136 families, and practical I2C layout guidance not consolidated in the manufacturer datasheet.
MAX1237KEUA+T - 12-Bit 4-Ch SAR ADC, I2C, 8-uMAX | Maxim
The Maxim Integrated (Analog Devices) MAX1237KEUA+T is a 12-bit, low-power, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with 4 analog input channels, an internal 2.048 V reference, internal track/hold, internal clock, and an I2C-compatible 2-wire serial interface, housed in an 8-pin uMAX/uSOP package. The K suffix designates the industrial operating temperature range of -40C to +85C; the E suffix marks the 8-pin uMAX/uSOP; the A suffix denotes the -40C to +85C industrial grade; the +T suffix indicates tape-and-reel packaging. A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation register and an internal DAC to digitize an analog input one bit per clock cycle. SAR ADCs are valued for low-latency conversions, deterministic acquisition time, and excellent DC accuracy. As a low-power multi-channel SAR ADC with an integrated reference, the MAX1237 belongs to the hierarchy: SAR ADC -> data converter -> mixed-signal IC -> semiconductor. Key features include 12-bit resolution, 2 or 4 single-ended / 1 or 2 differential input channels (software configurable), 94.4 ksps maximum sampling rate, 2.7 V to 3.6 V digital supply (compatible with 1.8 V/2.5 V/3.3 V logic) and 4.5 V to 5.5 V analog supply (MAX1236/MAX1237) - note the MAX1238/MAX1239 in this family share the same 8-pin uMAX package but differ in channel count and supply arrangement. The internal 2.048 V reference provides ratiometric or absolute conversion with 1 LSB INL and 1 LSB DNL (typical). The I2C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes. Typical applications include 4-20 mA industrial sensor digitizing, hand-held instrumentation, portable battery-powered data loggers, PLC analog input modules, HVAC sensor boards, and consumer-grade medical devices. The wide supply tolerance lets the part share analog and digital rails on common 5 V/3.3 V industrial backplanes. When designing with this ADC, place a 10 uF decoupling capacitor adjacent to AVDD and a 1 uF capacitor adjacent to DVDD to keep reference and converter noise off the conversion result. The REF pin requires a minimum 1 uF external bypass capacitor for stability; do not omit it.
MAX1237LEUA+ - 12-Bit 4-Ch SAR ADC, I2C, 8-uMAX | Maxim
The Maxim Integrated (now Analog Devices) MAX1237LEUA+ is a 12-bit, low-power, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with an internal track/hold, voltage reference, clock, and an I2C-compatible 2-wire serial interface. It accepts 4 single-ended or 2 differential analog inputs in an 8-pin uMAX/uSOP (TSSOP-8, 3 mm body) package, operates from 2.7 V to 3.6 V (low-voltage mode) or 4.5 V to 5.5 V (5 V mode), and runs up to 94.4 kilosamples per second at full throughput. An ADC is a mixed-signal integrated circuit that converts a continuous analog voltage on its input pin into a discrete digital code that a microcontroller or processor can read. The SAR (Successive Approximation Register) architecture uses an internal binary-search DAC plus comparator to converge one bit per clock cycle, giving a deterministic 12-cycle conversion that is well-suited to multiplexed multi-channel data-acquisition systems where low power and small size matter more than multi-megasample rates. Key features include 4 single-ended / 2 differential input channels with software-configurable unipolar/bipolar operation, an internal 2.048 V or 4.096 V reference (selectable between internal reference and external REF), an I2C-compatible 2-wire serial interface with seven slave addresses, hardware/software shutdown modes that drop supply current below 1 microampere between conversions, and an integrated FIFO/scanner mode for autonomous channel scanning. The -L suffix denotes the industrial -40 C to +85 C operating range. Typical applications for the MAX1237LEUA+ are portable and battery-powered data-acquisition front-ends, 4-20 mA loop-powered sensor transmitters, handheld medical instruments, programmable logic controller (PLC) analog input modules, HVAC environmental sensor hubs, and consumer equipment such as white-goods user-interface boards. When designing with the MAX1237LEUA+, place the 0.1 microfarad bypass capacitor as close as possible to the AVDD pin and the 10 microfarad bulk capacitor at the board input; the analog inputs require a low-impedance source to settle within the acquisition window at 94.4 kSPS. This page synthesizes authorized distributor pricing, drop-in pin-compatible alternatives from the MAX1236/MAX1238/MAX1239 family and across brands, and practical design notes not found in the manufacturer datasheet alone.
MAX1237LEUA+T - 12-Bit, 4/12-Ch 2-Wire ADC | Maxim Integrated
The Analog Devices (formerly Maxim Integrated) MAX1237LEUA+T is a low-power, 12-bit, multi-channel analog-to-digital converter (ADC) with an I2C-compatible 2-wire serial interface, offered in an 8-pin µMAX package with tape-and-reel packaging. It features 4 or 12 analog input channels, an internal track/hold, voltage reference, and an internal oscillator, and operates from a single 2.7V to 3.6V supply while consuming only 670 µA at the maximum sampling rate of 94.4 ksps. An ADC (Analog-to-Digital Converter) is a data-acquisition component that translates real-world analog signals into discrete digital codes, allowing microcontrollers and processors to read sensor outputs, audio levels, or system voltages. The MAX1237 belongs to the successive-approximation register (SAR) ADC family, which excels at low-latency, multiplexed multi-channel conversions and is widely used in embedded data-acquisition systems. In the broader component hierarchy, this device sits within Data Converters > ADC > SAR ADC > Multi-Channel SAR ADC > Low-Power Serial-Interface ADC, and is one of four variants (MAX1236/MAX1237/MAX1238/MAX1239) covering 3V and 5V supplies and 4 or 12 input channels. Key features include 12-bit resolution with ±1 LSB DNL, 4.5V to 5.5V or 2.7V to 3.6V supply operation (L grade), hardware- and software-configurable unipolar/bipolar input ranges (0 to VREF, 0 to 2×VREF, and ±VREF/±2×VREF), an internal 2.048V or 4.096V reference, and software-programmable input channel selection including an external REF/AIN channel. The 2-wire I2C-compatible interface supports standard, fast, and high-speed modes and allows up to four device addresses on a single bus. The internal SAR architecture combined with input fault protection to ±6V and an integrated FIFO reduces microcontroller overhead, making the device well-suited to low-power, multi-sensor designs. The internal track/hold amplifier accepts fast input slews, while the integrated reference and oscillator minimize external BOM cost. Typical applications include battery-powered portable instrumentation, sensor conditioning for temperature, pressure, or strain gauges, handheld multimeters, data loggers, and factory-floor analog input modules. The 1.2 mA input leakage and 94.4 ksps throughput allow designers to scan multiple low-bandwidth transducer signals from a single ADC. When designing with this part, ensure the input common-mode voltage stays inside the supply rails and add proper decoupling (typically a 10 µF bulk cap near the supply pin plus a 0.1 µF ceramic close to the package). For noisy environments, average multiple conversions in software to take advantage of the device's noise-free resolution. This page synthesizes verified distributor pricing, drop-in same-family replacements, comparison parameters, and practical design notes that are not presented together on the manufacturer datasheet or in any single distributor listing.
MAX1238EEE/V+ - 12-Bit 12-Ch 94.4ksps SAR ADC | Maxim Integrated
The Maxim Integrated MAX1238EEE/V+ is a low-power, 12-bit, 12-channel successive-approximation analog-to-digital converter (SAR ADC) that operates from a single 4.5V to 5.5V supply and samples at up to 94.4 ksps while drawing only 670 µA. It integrates an input track/hold, 4.096 V internal voltage reference, internal clock, and an I²C-compatible 2-wire serial interface, and is offered in a 16-pin QSOP (EEE) package with an extended industrial temperature grade. A SAR ADC is a converter architecture that uses a binary-weighted capacitor network and a comparator to resolve each input sample in N clock cycles, where N is the resolution in bits. It belongs to the data-acquisition IC family, sitting between precision analog front ends and digital microcontrollers; the taxonomy runs SAR ADC -> ADC -> data converter -> data acquisition IC -> mixed-signal IC. This category matters because SAR ADCs offer deterministic latency, no-pipeline-delay sampling, and very low power, making them the workhorse for multiplexed sensor reading in industrial and instrumentation systems. Key specifications include 12 input channels (configurable as 6 or 12 single-ended or pseudo-differential pairs), ±1 LSB INL and DNL, an internal 4.096 V reference (±1% accuracy per Maxim datasheet), and 2-wire serial compatibility at clock rates up to 400 kHz (Fast-Mode). The 16-QSOP exposed-pad version provides a low thermal-resistance path to PCB copper, allowing the part to dissipate internally generated heat during continuous 94.4 ksps bursts. Internally, the device combines a high-impedance input mux, the SAR logic core, an auto-shutdown mode that drops supply current to 1.5 µA between conversions, and a configurable scan mode that sequentially cycles through selected channels and stores results in the I²C-accessible register map. The /V suffix denotes the automotive-grade operating range (-40 °C to +125 °C), distinguishing it from the commercial MAX1238EEE+. Typical applications include industrial process-control sensor multiplexing, portable data loggers, patient-monitoring front ends, factory-automation PLC analog input modules, and HVAC environmental sensor hubs. The wide analog input range (0 to VREF when internal reference is used, or up to VDD with external reference) supports direct connection to 4-20 mA loop shunts, thermistor dividers, and bridge sensors. When designing with this part, place the 0.1 µF and 10 µF decoupling capacitors within 5 mm of AVDD/DVDD pins, and follow Maxim's QSOP thermal-pad layout to keep junction temperature within the /V grade's 125 °C ceiling under worst-case 5.5 V × 670 µA continuous sampling. This page synthesizes distributor pricing for the /V automotive-grade variant, drop-in cross-reference parts from the same MAX1236-MAX1239 family, and practical design notes not bundled in the manufacturer datasheet.
MAX1238KEEE+T - 12-Bit, 12-Channel SAR ADC | Maxim Integrated
The Analog Devices / Maxim Integrated MAX1238KEEE+T is a low-power, 12-bit, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with up to 12 analog input channels, internal track/hold, internal voltage reference, internal clock, and an I2C-compatible 2-wire serial interface, housed in a 16-pin QSOP package. Operating from a 2.7V to 3.6V or 4.5V to 5.5V supply, it consumes approximately 670 µA at the maximum conversion rate and drops to 1 µA in shutdown. A SAR ADC (Successive Approximation Register ADC) is a type of analog-to-digital converter that uses a binary search through an internal DAC to resolve an analog input into a digital code, one bit per conversion clock cycle. The SAR ADC family sits within the broader hierarchy of ADCs -> data converters -> mixed-signal ICs -> integrated circuits, and it is widely used when designers need a deterministic acquisition time, low latency, and moderate resolution (typically 8 to 18 bits) at sample rates up to a few MSPS. Key features include 12-bit resolution with no missing codes, software-configurable unipolar/bipolar input ranges, an internal 2.5V reference (4.096V in the MAX1239 variant), single-ended or pseudo-differential channel configurations, and an I2C-compatible serial interface supporting both 400 kHz Fast Mode and 1.7 MHz High-Speed Mode. The 16-pin QSOP package measures approximately 3.9 mm wide, suiting compact PCB layouts where multiple analog sensors must be digitized close to the controller. The architecture combines a capacitive DAC, a high-bandwidth track/hold front end, and an on-chip oscillator, eliminating the need for external precision components. An integrated sequencer can automatically scan all configured channels in one I2C transaction, reducing host firmware overhead in multi-sensor data acquisition loops. Typical applications include battery monitoring in portable medical and industrial equipment, multi-cell battery pack voltage sensing in power tools and e-bikes, front-end digitizing for PLC analog input modules, temperature/pressure transducer arrays in process control, and general-purpose sensor multiplexing in 4 mA to 20 mA loop replacement designs. When designing with this ADC, place the 0.1 µF supply bypass capacitor as close to pin 16 (VDD) and pin 1 (GND) as possible. Because the reference is internal, supply noise above 100 kHz couples directly into the conversion result; a ferrite bead or pi-filter on AVDD/REF is recommended when the part shares a rail with noisy digital or switching loads. This page synthesizes distributor pricing from DigiKey and Mouser, pin-compatible same-family drop-in alternatives, and PCB-level design notes that are not duplicated in the manufacturer datasheet.
MAX1238LEEE+T - 12-Ch 12-Bit 94.4ksps I2C SAR ADC | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX1238LEEE+T is a 12-bit, low-power, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with 6 or 12 analog input channels, an internal track/hold, an internal 4.096 V voltage reference, an internal oscillator, and an I2C-compatible 2-wire serial interface. It operates from a single 4.5 V to 5.5 V analog supply, samples at up to 94.4 ksps, and draws only 670 µA at maximum throughput, with supply current falling to 0.5 µA in shutdown. A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of analog-to-digital converter that uses a binary-search feedback loop with an internal DAC to digitize an analog input, producing one conversion per N clock cycles for N bits of resolution. SAR ADCs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They are favored over delta-sigma and pipeline ADCs when low latency, deterministic sample timing, and a small footprint are needed, which is why they dominate multi-channel sensor-acquisition and embedded instrumentation front-ends. Key specifications include 12-bit resolution, ±1 LSB INL/DNL (typ.), an internal 4.096 V reference with 50 ppm/°C tempco, an input range of 0 V to VREF (unipolar) or ±VREF (bipolar software-configurable), a software-configurable unipolar/bipolar mode with 4 single-ended or 12 differential inputs, an I2C-compatible 2-wire serial interface running at up to 400 kHz in standard mode, an integrated temperature sensor with ±2 °C accuracy, and operation over the extended industrial temperature range of -40 °C to +85 °C. The architecture combines an internal charge-redistribution DAC, sample-and-hold, configurable input multiplexer, and internal clock, so external components are limited to bypass capacitors and pull-ups on the I2C bus. Power-down sequencing through software reduces quiescent current to sub-microamp levels between conversions, making it suitable for battery-powered sensor polling. Typical applications include portable data-acquisition loggers, industrial process-control sensor multiplexing, thermocouple and RTD temperature measurement, medical instrumentation front-ends, battery-powered handheld test equipment, and remote HVAC monitoring. The integrated temperature sensor is useful for cold-junction compensation in thermocouple chains. Designers should keep analog and digital grounds joined at a single point near the IC and place 1 µF + 0.1 µF decoupling caps close to AVDD/DVDD to preserve 12-bit noise performance across heavy digital switching. Pricing is current as of 2026-10-14 and reflects typical distributor inventory.
MAX1239LEEE+ - 12-Bit 12-Ch 2-Wire SAR ADC | Maxim Integrated
The Analog Devices (formerly Maxim Integrated) MAX1239LEEE+ is a low-power, 12-bit resolution, 12-channel (6 differential), successive-approximation analog-to-digital converter (SAR ADC) with an internal track/hold, internal voltage reference, internal clock, and an I2C-compatible 2-wire serial interface. It is offered in a 16-pin QSOP package with an operating supply range of 2.7V to 3.6V and a secondary 4.5V to 5.5V tolerance, drawing typically 670 microamps at maximum sampling rate. Sample rate is software-selectable up to 94.4 ksps through the external I2C clock configuration. The integrated 4.096V internal reference eliminates an external reference IC and four external capacitors in most applications, reducing BOM and PCB area. An SAR ADC is a successive-approximation-register analog-to-digital converter that uses an internal binary-search algorithm against a precision reference voltage to convert an analog sample to a 12-bit digital word in a fixed number of clock cycles. SAR ADCs sit inside the broader hierarchy of analog-to-digital converters (which also includes delta-sigma, pipeline, flash, and dual-slope types). They are favored when the application needs deterministic latency, low power, and no architectural input-charge kickback, making them dominant in multiplexed multi-channel data-acquisition systems, sensor-interface modules, and battery-powered instrumentation. Key features include 12 input channels configurable as 6 single-ended or 6 differential pairs, software-configurable unipolar/bipolar operation, an automatic channel-scan mode with internal sequencer, an internal 4.096V reference (or external reference option), software shutdown to 1 microamp typical, an I2C-compatible serial interface supporting standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes, and an operating temperature range of -40 degrees Celsius to +85 degrees Celsius. The integrated sequencer and channel-scan registers let a host microcontroller configure a one-shot or continuous scan that walks the channels and stores results in internal data registers without per-sample CPU intervention. The MAX1239LEEE+ is typically deployed in industrial process control loops, 4-20 mA sensor digitizers, handheld multimeters and test instruments, portable medical monitoring equipment, programmable logic controller (PLC) analog input modules, HVAC environmental sensor concentrators, and consumer battery chargers that need to monitor multiple cell voltages. In each case its combination of 12 channels, internal reference, and low operating current allows a single chip to replace a discrete ADC plus an external reference plus multiple analog multiplexers. For designs that need 14-bit or 16-bit noise-free resolution at the same channel density, the MAX130x family or the LTC2360 series would be the next step up. When designing with this ADC, place 0.1 microfarat ceramic bypass capacitors as close as possible to both AVDD and DVDD pins and keep the analog ground return path short and direct to the system analog ground plane to limit digital coupling. Software configuration must set the reference mode (internal vs external) and the clock-divider bits before initiating a conversion through the I2C setup register. This page synthesizes drop-in cross-reference data, distributor stock, design notes, and pin-compatible alternatives not found on a typical manufacturer product page.
MAX1239LEEE+T - 12-Bit 12-Channel 2-Wire Serial ADC | Maxim Integrated
The Analog Devices (formerly Maxim Integrated) MAX1239LEEE+T is a 12-bit, 12-channel successive-approximation analog-to-digital converter (SAR ADC) with an I2C-compatible 2-wire serial interface, housed in a 16-pin QSOP package. It operates from a single 2.7V to 3.6V supply, supports up to 94.4 ksps sampling rate, and integrates track/hold, voltage reference, and clock. A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm against an internal DAC to digitize an analog input within N clock cycles (one per bit), achieving N-bit resolution with low latency and deterministic conversion time. SAR ADCs sit within the ADC family (successive-approximation, sigma-delta, pipeline, flash) under the data-converter hierarchy, which itself falls under data acquisition and finally signal-chain/mixed-signal ICs in the broader semiconductor taxonomy. Key features of the MAX1239 include 12 input channels (with 6 channels configurable as differential pairs), an internal 2.5V or 4.096V reference (channel-dependent setting), automatic channel scanning, an on-chip FIFO, and software-configurable unipolar/bipolar inputs. The 2-wire interface supports standard (100 kHz), fast (400 kHz), and high-speed (1.7 MHz) modes, easing isolation across boards. Architecturally, the device combines a capacitive-charge-distribution DAC with an internal track/hold, sample clock, and 4.096V reference. Internal reference trimming minimizes gain error, while factory calibration of the internal oscillator removes the need for an external crystal in most applications. Typical uses include portable data loggers, battery-cell monitoring, panel-meter front-ends, industrial sensor multiplexing, and 4-20mA loop digitizers. The wide channel count is well matched to multi-sensor embedded systems where space and I/O count matter. When designing, allocate sufficient settling time on high-impedance inputs (the part supports 0.3 µA bias, so source impedance must be limited) and follow Maxim's recommended analog input RC network to avoid conversion noise. Decouple AVDD with 10 µF + 0.1 µF ceramic capacitors placed within 5 mm of the supply pins. This page synthesizes distributor pricing, drop-in same-package alternatives (different I2C address variants of MAX1236/MAX1237/MAX1238/MAX1239, plus the same family from Analog Devices) and practical design notes that go beyond a single datasheet table.