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MAX1275ACTC+T - 12-Bit 1.8Msps SAR ADC | Maxim Integrated
MAX1275ACTC+T

MAX1275ACTC+T - 12-Bit 1.8Msps SAR ADC | Maxim Integrated

The Maxim Integrated MAX1275ACTC+T is a 12-bit, 1.8 Msps, single-supply, low-power, true-differential, successive-approximation analog-to-digital converter (ADC) housed in a 12-pin TQFN (4x4 mm) package. It accepts a 2.7V to 3.6V analog supply (AVDD) and a separate digital supply, supports true-differential analog inputs up to ±VREF (where VREF can be driven internally or externally), and streams conversion results through a high-speed SPI/QSPI/MICROWIRE-compatible serial interface. Key specifications include a 1.8 Msps sampling rate, ±1 LSB INL (DNL) linearity, an internal 2.5V reference (with the option of an external reference), true-differential input bandwidth sufficient for AC measurements, and low power dissipation suitable for battery-powered and portable designs. The part supports both unipolar (0 to VREF) and bipolar (±VREF) input ranges. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous-time analog signal and converts each sample into a discrete digital code. SAR (successive-approximation register) ADCs use a binary-search algorithm with an internal DAC, offering an excellent trade-off between speed, accuracy, and power consumption. The MAX1275 sits in the data-converter hierarchy: ADC -> SAR ADC -> 12-bit ADC -> low-power single-supply ADC. The 1.8 Msps throughput and 12-bit resolution place it in the mainstream precision-sensing tier above 10-bit general-purpose ADCs but below 14-/16-bit precision converters, making it well-suited for industrial control, motor control, and base-station applications. Architecturally, the MAX1275 uses a charge-redistribution DAC together with a low-noise comparator and on-chip track/hold, achieving true-differential sampling that rejects common-mode noise - a critical feature in motor-drive and process-control environments where ground bounce and switching transients dominate. The internal 2.5V reference removes the need for an external precision reference in many designs, reducing BOM cost and PCB area, while still allowing external reference drive for tighter gain calibration. Typical applications include industrial process control loops (4-20 mA sensor digitisation), motor control current/voltage sensing, base-station RF power-detector digitisation, data-acquisition front-ends, and handheld instrumentation. Its single 3V supply and serial interface also make it attractive for portable test gear and medical monitoring devices. When designing with the MAX1275ACTC+T, ensure the analog and digital grounds are joined at a single point near the exposed pad, place the 0.1 µF + 10 µF decoupling pair as close as possible to AVDD/DVDD, and route the SPI signals with characteristic impedance control to avoid coupling digital noise back into the analog front-end. This page synthesises distributor pricing, drop-in alternatives within the MAX1274/MAX1275 family and competitive cross-brand 12-bit 1.8 Msps ADCs, and practical design notes drawn from the Maxim datasheet - information not consolidated on a typical distributor product page.

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MAX1276CTC+ - 12-Bit 1.8Msps SAR ADC | Analog Devices
MAX1276CTC+

MAX1276CTC+ - 12-Bit 1.8Msps SAR ADC | Analog Devices

The Analog Devices MAX1276CTC+ is a 12-bit, 1.8 Msps, low-power, true-differential, serial-output successive-approximation analog-to-digital converter (SAR ADC) housed in a 12-pin TQFN (4x4) package. It features a single +3V analog supply, an internal 2.5V reference, and a single-ended or true-differential analog input channel, with throughput up to 1.8 million samples per second at the full Nyquist bandwidth. A SAR ADC is a type of analog-to-digital converter that uses a binary search (successive approximation) through a precision DAC and comparator to digitize each input sample in N clock cycles for N bits of resolution. SAR converters are valued for deterministic latency, low latency between sample and conversion result, no pipeline delay, and excellent DC accuracy with no missing codes - they are widely used in precision industrial, instrumentation, and motor-control data-acquisition front ends where deterministic conversion timing simplifies synchronization with control loops. Key features include a true-differential analog input that rejects common-mode noise, an internal 2.5V reference (no external reference required for many applications), a low power consumption of around 18 mW at 1.8 Msps, and a high-speed SPI/QSPI/MICROWIRE-compatible serial interface. The 12-pin TQFN (4x4 mm) package is small and supports reflow soldering on standard SMT lines, while the wide analog supply range (2.7V to 3.6V) makes the part easy to integrate into 3.3V industrial and data-acquisition designs. The architecture uses a charge-redistribution DAC and an internal low-drift reference, achieving 12-bit resolution with no missing codes and an SINAD typically around 71 dB at fIN close to Nyquist. The serial interface is straightforward and supports daisy-chaining multiple MAX1276/MAX1278 devices on a single SPI bus when more than one channel is needed in a system. Typical applications include process control and industrial data acquisition, motor control current/voltage sensing, weigh scales, portable instrumentation, and front-end digitizers for 4-20 mA loop-powered sensors. The combination of true-differential input and integrated reference simplifies board layout and BOM compared to discrete SAR solutions. For battery-powered designs, the part's low shutdown current extends operating time when the ADC is sampled intermittently. When designing with this ADC, keep analog and digital grounds short and tied at a single point, place the 0.1 uF bypass capacitor as close as possible to the AVDD pin, and route the serial-clock line with a series resistor or controlled impedance to limit ringing at 1.8 Msps. Using the internal reference removes the need for an external reference but sacrifices full-scale range flexibility; for applications above 2.5V FS, an external reference can be driven into REF. This page synthesizes distributor pricing, drop-in alternatives from the same ADI pin-compatible family and from cross-brand sources, and practical design notes not found in the manufacturer datasheet, giving engineers a faster path from datasheet to BOM.

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MAX1276CTC+T - 12-Bit 1.8Msps Differential ADC | Maxim Integrated
MAX1276CTC+T

MAX1276CTC+T - 12-Bit 1.8Msps Differential ADC | Maxim Integrated

The Maxim Integrated MAX1276CTC+T is a 12-bit, 1.8 Msps, single-supply, low-power, true-differential analog-to-digital converter (ADC) with an internal reference, packaged in a 12-pin TQFN (4x4 mm). It operates from a single +2.7V to +3.6V analog supply, draws only 4.5 mW at 1.5 Msps, and provides a true-differential analog input paired with an internal 2.5V bandgap reference. What is a SAR ADC? A successive-approximation-register (SAR) analog-to-digital converter is a class of Nyquist-rate ADC that converts an analog input to a digital code by stepping through bit decisions from MSB to LSB using a binary search through an internal capacitive DAC. SAR ADCs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They are favored over delta-sigma ADCs for multi-channel multiplexed systems and over pipelined ADCs when true-differential input ranges, low latency, and deterministic behavior are needed. Key features of the MAX1276CTC+T include a true-differential input stage supporting 0 to VREF (unipolar) or ±VREF (bipolar) signal swings, an internal 2.5V low-drift reference, an external reference option for ratio-metric conversions, and a high-speed SPI/QSPI/MICROWIRE-compatible serial interface. The 12-bit resolution with no missing codes and ±1 LSB INL delivers clean, monotonic conversion results. The integrated track-and-hold accepts input bandwidths well above Nyquist, preserving signal integrity for AC-coupled measurement front-ends. The device uses a charge-redistribution SAR architecture with an automatic power-down mode between conversions, dropping supply current to under 1 µA when idle. This makes it well-suited for battery-powered or duty-cycled instrumentation where the part only wakes during a sample window. The serial output delivers 12-bit results MSB-first with a maximum 20 MHz SCLK rate, allowing direct connection to microcontrollers, DSPs, and FPGAs without glue logic. Typical applications include data-acquisition systems, pen-digitizers and touch-screen controllers, portable instrumentation, battery-powered medical devices, and process-control I/O modules. The +3V single-supply operation simplifies power-tree design in mixed 3.3V/1.8V systems where a clean analog rail is essential. The internal reference eliminates the external reference IC on most boards, reducing BOM cost and PCB area. When designing with the MAX1276CTC+T, place a 0.1 µF ceramic bypass capacitor within 5 mm of the AVDD pin and a 10 µF bulk tantalum or ceramic cap on the supply rail. Keep the analog input traces short and guard them with a ground pour to minimize coupled noise; the true-differential input stage rejects common-mode disturbance, but PCB asymmetry degrades CMRR. The exposed pad (EP) must be soldered to a clean analog ground plane for thermal and electrical performance. This page synthesizes distributor pricing for the tape-and-reel MAX1276CTC+T variant, pin-compatible same-family drop-in alternatives (MAX1276ETC+T, MAX1276CTC+), and practical layout notes not collected in the manufacturer datasheet alone.

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MAX1278CTC+T - 12-Bit 1.8Msps SAR ADC | Maxim Integrated
MAX1278CTC+T

MAX1278CTC+T - 12-Bit 1.8Msps SAR ADC | Maxim Integrated

The Maxim Integrated MAX1278CTC+T is a 12-bit, 1.8Msps, single-supply, low-power, true-differential analog-to-digital converter (ADC) with an internal reference, offered in a 12-pin TQFN (4x4 mm) package. It features a successive-approximation (SAR) architecture with a serial output interface, a single +3V analog supply, and 1 true-differential analog input channel designed for high-noise-immunity signal acquisition. A SAR ADC is a type of analog-to-digital converter that uses a binary-search algorithm with a high-speed comparator and an internal DAC to resolve each conversion in N clock cycles, where N equals the resolution in bits. SAR ADCs combine compact die area, deterministic latency (one conversion per N cycles), and excellent DC accuracy with moderate sampling rates, making them the workhorse of precision data-acquisition front-ends. The MAX1278CTC+T sits inside the broader power-management and data-conversion signal chain as the link between analog transducers (sensors, current shunts, bridge outputs) and an MCU, FPGA, or DSP that performs post-processing. Key features include an internal precision reference, true-differential inputs for common-mode noise rejection, low power consumption suitable for battery-powered applications, a serial interface compatible with SPI/QSPI/MICROWIRE, and a compact TQFN-12 footprint. The internal reference eliminates external reference components and the associated layout noise. The MAX1278 uses a charge-redistribution SAR core driven by an internal oscillator and an integrated input track-and-hold, achieving 12-bit resolution at up to 1.8 million samples per second. This combination of speed and accuracy suits systems that need to capture fast transient signals or multiplex multi-channel sensor arrays without sacrificing effective number of bits (ENOB). The true-differential input rejects common-mode noise picked up on long sensor cables, allowing direct connection to bridge sensors, current-sense amplifiers, and differential line drivers. Typical applications include industrial process control loops, portable battery-powered instrumentation, data-acquisition systems, sensor signal conditioning for strain gauges and thermocouples, and motor-control current monitoring. Designers favor it where board space and power are constrained but full 12-bit resolution must be retained per channel. When designing with the MAX1278CTC+T, place a 0.1 uF ceramic bypass capacitor within 5 mm of the AVDD pin and a 10 uF tantalum or ceramic bulk capacitor on the analog supply rail. Use a separate analog ground island and tie it to the digital ground at a single point under the exposed pad of the TQFN to keep digital switching currents away from the input signal ground reference. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not collected together in the manufacturer datasheet alone.

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MAX1279AETC+ - 12-Bit 1.5Msps Differential ADC | Analog Devices
MAX1279AETC+

MAX1279AETC+ - 12-Bit 1.5Msps Differential ADC | Analog Devices

The Analog Devices (formerly Maxim Integrated) MAX1279AETC+ is a 12-bit, 1.5 Msps, single-supply, low-power, true-differential analog-to-digital converter (ADC) with internal 2.5V reference, offered in a 12-pin TQFN package. It supports a unipolar analog input range of 0 to +VREF and operates from a single +3V supply (typical 3.6V maximum), drawing only a few milliamps of supply current during full-speed conversions. What is a successive-approximation ADC? An SAR (Successive Approximation Register) ADC is a sampled-data converter that uses an internal binary-search algorithm combined with an internal DAC to digitize an analog input. SAR ADCs typically offer an excellent balance of speed (hundreds of kSps to a few Msps), resolution (10-18 bits), latency (typically one conversion cycle), and power consumption (single-digit mA), placing them in the converter hierarchy between high-speed flash ADCs and high-resolution delta-sigma ADCs. Key features of the MAX1279AETC+ include a true-differential analog input path that improves common-mode noise rejection, an internal 2.5V precision reference (eliminating an external component), a high-speed SPI/QSPI/MICROWIRE-compatible serial interface, and hardware- or software-controlled shutdown that reduces supply current to a few microamps between conversions. The MAX1277 (225 ksps) and MAX1279 (1.5 Msps) are pin-compatible family members sharing the same 12-pin TQFN footprint. Internally, the MAX1279AETC+ uses a charge-distribution DAC and a high-bandwidth track-and-hold to digitize true-differential inputs in a single conversion cycle. The true-differential input structure rejects common-mode noise from the signal source and the PCB ground, which is critical in motor-control and industrial-sensor applications where ground loops and large common-mode transients are common. Typical applications include data acquisition systems, motor control current sensing, industrial process control, weigh scales, and portable instrumentation. The combination of single-supply operation, internal reference, true-differential input, and low power dissipation makes the MAX1279AETC+ particularly attractive for battery-powered or loop-powered industrial sensor front-ends. Design consideration: place the 0.1 µF and 10 µF bypass capacitors as close as possible to the AVDD pin with a short, wide trace, and route the differential input traces symmetrically with a solid ground plane beneath them. Decouple the digital DVDD from AVDD with a ferrite bead to prevent digital switching noise from coupling into the analog front-end. This page synthesizes distributor pricing, drop-in compatible same-package alternatives from the MAX1277/MAX1279 family, and practical layout/design notes that complement (rather than duplicate) the manufacturer datasheet.

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MAX1281BCUP - 12-Bit 8-Ch 400ksps SAR ADC | Maxim Integrated
MAX1281BCUP

MAX1281BCUP - 12-Bit 8-Ch 400ksps SAR ADC | Maxim Integrated

The Maxim Integrated (Analog Devices) MAX1281BCUP is a 12-bit, 8-channel, successive-approximation-register (SAR) analog-to-digital converter (ADC) with internal 2.5 V reference and serial SPI/QSPI/MICROWIRE-compatible interface, housed in a 20-pin TSSOP package. It accepts 4 or 8 analog input channels through an internal MUX and combines a high-bandwidth track/hold amplifier that delivers up to 400 ksps (MAX-IN) or 300 ksps (MAX1281B grade) throughput on a single 2.7 V to 3.6 V analog supply. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous analog voltage signals and converts them into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. The SAR architecture uses a successive-approximation register with a precision DAC to binary-weigh input voltage against the reference in lock-step, settling for a one-stage-per-bit conversion with deterministic latency. In the broader taxonomy, the MAX1281BCUP belongs to the data-converter hierarchy: ADC -> SAR ADC -> precision ADC -> mixed-signal IC -> integrated circuit -> semiconductor. The 8-channel MUX makes it a single-chip multi-channel data acquisition front-end. Key features include: 12-bit resolution with no missing codes, 400 ksps (MAX1280) or 300 ksps (MAX1281) throughput, internal 2.5 V reference, single 2.7 V to 3.6 V analog supply operation, low 2.5 mA (typ) operating supply current, hardware- and software-configurable analog input MUX (4-channel single-ended or 8-channel pseudo-differential via AIN0-AIN7 plus dedicated COM input), SPI/QSPI/MICROWIRE-compatible serial interface, and an external clock mode option (MAX1281B external-clock variants). The TSSOP-20 surface-mount package offers small footprint with gull-wing leads. The MAX1281BCUP uses a BiCMOS process that integrates a precision switched-capacitor DAC, comparator, SAR register, control logic, and 8:1 analog MUX on the same die. Internal reference eliminates an external reference IC, reducing BOM cost in cost-sensitive consumer, debug, and process-control equipment. The high-bandwidth track/hold sustains accurate acquisition at full speed, with track/hold acquisition time dedicated to the first internal-clock cycle per conversion. Single-supply operation simplifies portable-instrument power design. The MAX1281BCUP is well suited for multi-channel data acquisition in data-acquisition cards, process-control and industrial sensor signal chains, portable instrumentation, medical instruments, battery-powered consumer audio and telecommunications systems, and embedded system front-ends with multiple analog sensors. When using the MAX1281BCUP, place 10 uF and 0.1 uF bypass capacitors close to the analog supply pin and ensure the analog and digital grounds are joined at a single point near the ADC. Allow 20 clock cycles per conversion in internal-clock mode and follow the datasheet logic sequence when reconfiguring the MUX between conversions. This page synthesizes distributor pricing, drop-in TSSOP-20 alternatives, and practical design application notes not found in the manufacturer datasheet.

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MAX1282AEEE - 400ksps 12-Bit 4-Ch Serial ADC | Maxim Integrated
MAX1282AEEE

MAX1282AEEE - 400ksps 12-Bit 4-Ch Serial ADC | Maxim Integrated

The Maxim Integrated MAX1282AEEE is a 12-bit, 400 ksps, 4-channel successive-approximation analog-to-digital converter (ADC) with an internal 2.5V reference, serial SPI/QSPI/MICROWIRE interface, and single +5V analog supply, housed in a 16-pin TSSOP package rated for 0 °C to +70 °C commercial operation. The part integrates a true SAR core, on-chip track/hold, internal reference, and four analog input channels with software-configurable unipolar input range, achieving ±0.5 LSB integral nonlinearity (INL) and ±1 LSB differential nonlinearity (DNL). An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against a precision DAC to convert each input sample in a fixed number of clock cycles. Within the data-converter hierarchy, the MAX1282AEEE belongs to the medium-speed, multi-channel, low-power SAR ADC family, which sits between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest). This product category serves precision instrumentation, industrial control loops, and embedded data-acquisition systems where multiple analog signals must be digitized at moderate rates with deterministic latency. Key differentiating specifications include 400 ksps maximum sampling rate, 4 input channels with software selection, internal 2.5V reference (10 ppm/°C typ), 3.0 µA power-down current, and a -86 dB THD at 100 kHz input. The serial interface operates up to 20 MHz in SPI mode, supporting DSP- and microcontroller-friendly data framing. Single-supply +5V operation eliminates the bipolar rails that many competing 12-bit parts still require. Architecturally, the device uses a charge-redistribution SAR core with an input track/hold rated to 0.5 ns aperture delay, an on-chip 2.5V buried-zener reference buffer, and a sequencer that cycles through the four analog inputs when placed in scan mode. The wide +5V supply tolerance simplifies industrial PLC and process-control designs where supply noise is heavy and rails are shared with relays. Typical applications include multi-zone industrial process monitoring (RTD/thermocouple multiplexing), portable 4-channel data loggers, panel-meter and weigh-scale front ends, rack-mounted instrumentation, and embedded sensor-interface modules in industrial and consumer end equipment. The pin-compatible MAX1283AEEE offers a higher 300 ksps / lower 4-channel trade-off only via software register access. When designing with this part, place a 10 µF tantalum plus 0.1 µF ceramic bypass directly at pin 16 (VDD) and at pin 1 (REF) to preserve reference stability. Adequate analog/digital ground plane separation is critical because the SAR core draws transient currents of several mA on each conversion edge, which couple back into the reference if sharing is poor. This page synthesizes verified distributor pricing, drop-in pin-compatible alternatives, and design notes that complement the manufacturer datasheet and the typical-application schematic.

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MAX1283AEEE - 12-Bit 300ksps 4-Ch Serial ADC | Maxim Integrated
MAX1283AEEE

MAX1283AEEE - 12-Bit 300ksps 4-Ch Serial ADC | Maxim Integrated

The Maxim Integrated (Analog Devices) MAX1283AEEE is a 12-bit, 300ksps/400ksps, low-power, single-supply, 4-channel analog-to-digital converter (ADC) with an internal 2.5V reference, packaged in a 16-pin QSOP (TSSOP-16) surface-mount package. It operates from a +2.7V to +3.6V supply, integrates a 4-channel analog input multiplexer, a high-bandwidth track/hold (T/H), and a serial (SPI/QSPI/MICROWIRE-compatible) digital interface, and uses a successive-approximation architecture. An ADC (analog-to-digital converter) is an integrated-circuit component that translates a real-world analog voltage or current into a discrete digital code. The MAX1283 family belongs to the successive-approximation register (SAR) ADC category, which is a sub-type of data-converter ICs in the broader mixed-signal semiconductor hierarchy: ADC -> data converter -> data-acquisition IC -> semiconductor. SAR ADCs are valued for their deterministic latency, low power consumption, and ability to operate from low-voltage single supplies, making them the default choice for precision multi-channel embedded sensing applications. Key features of the MAX1283AEEE include 300ksps guaranteed throughput (400ksps for the MAX1283 internal characterization), an internal 2.5V reference, software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, a hardware SHUTDOWN pin that reduces supply current to under 10uA, an external-reference option, and a serial interface compatible with SPI, QSPI, and MICROWIRE. The pseudo-differential input mode allows the negative input to track small common-mode swings, improving effective common-mode rejection in industrial environments. The MAX1283AEEE uses a charge-distribution DAC inside the SAR core and an input track/hold amplifier with bandwidth sufficient for full-scale step settling within one acquisition cycle. Its low THD and DNL specifications make it suitable for digitizing signals up to the audio band without missing codes. Use the MAX1283AEEE in portable data loggers, 4-20mA loop-powered sensor front-ends, hand-held oscilloscope probes, pen-tablet digitizers, and patient-monitoring front-ends where 4 single-ended or 2 pseudo-differential channels, 12-bit accuracy, and <2.5mA active supply current are required. When designing with this device, place a 0.1uF ceramic bypass capacitor within 5mm of the AVDD pin and tie AGND and DGND to a single star point to preserve the rated INL and DNL. Do not operate the analog inputs above AVDD or below AGND, even when the channel is powered down. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes that are not collated in the manufacturer datasheet, providing a faster engineering-decision reference.

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MAX1284ACSA+T - 12-Bit 400ksps Serial ADC | Maxim Integrated
MAX1284ACSA+T

MAX1284ACSA+T - 12-Bit 400ksps Serial ADC | Maxim Integrated

The Maxim Integrated MAX1284ACSA+T is a 12-bit, 400 ksps, single-supply, low-power successive-approximation analog-to-digital converter (ADC) with an internal reference, housed in an 8-pin SO (SOIC-8) package. It operates from a single 4.5 V to 5.5 V analog supply, integrates a high-bandwidth track/hold front end, and outputs conversion data over a SPI/QSPI/MICROWIRE-compatible serial interface, which simplifies board routing and saves MCU pins versus parallel-output ADCs. An ADC (analog-to-digital converter) is a mixed-signal data-acquisition building block that converts a continuous-time, continuous-amplitude analog input into a discrete-time, discrete-amplitude digital code. Successive-approximation (SAR) ADCs use an internal binary-search algorithm and a comparator to resolve each bit in N clock cycles, giving a strong balance of speed, resolution, and power consumption for multi-channel data acquisition, sensor readout, and process-control loops. SAR ADCs sit between sigma-delta (high resolution, low speed) and flash (very high speed, low resolution) architectures in the converter taxonomy. The MAX1284/MAX1285 family delivers 400 ksps (MAX1284) or 300 ksps (MAX1285) throughput with a 4.5 V to 5.5 V supply and draws only a few mW during conversion. The MAX1284ACSA+T variant (suffix 'A' = automotive-style 'A' grade, 'C' = commercial temperature range 0 C to +70 C, 'SA' = 8-pin SO, '+T' = tape-and-reel packaging). It is a drop-in, higher-speed upgrade for the MAX1240/MAX1241 family in legacy 8-pin SO layouts. Typical applications include portable data loggers, remote sensor front ends, 4-20 mA loop-powered transmitters, pen digitizers, and patient-monitoring instruments where the combination of small footprint, low power, and serial output is valuable. The 8-pin SO footprint is convenient for hand-probe rework and for retrofitting older 8-pin ADC sockets. When designing with the MAX1284ACSA+T, place a 0.1 uF ceramic bypass capacitor within 5 mm of the AVDD pin and a 10 uF bulk capacitor at the supply rail. Use a low-impedance analog input with an RC anti-alias filter; SAR input current transients settle best when source impedance is kept below about 1 kohm.

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MAX1284BCSA - 12-Bit 400ksps SAR ADC | Maxim Integrated
MAX1284BCSA

MAX1284BCSA - 12-Bit 400ksps SAR ADC | Maxim Integrated

The Maxim Integrated (Analog Devices) MAX1284BCSA is a 12-bit, 400 ksps successive-approximation analog-to-digital converter (ADC) with a high-bandwidth track/hold, internal +2.5 V reference, and SPI/QSPI/MICROWIRE-compatible serial interface, offered in an 8-pin SOIC narrow-body package. The MAX1284 operates from a single +4.5 V to +5.5 V supply and combines high conversion speed with low power consumption, making it a pin-compatible, higher-speed upgrade for the MAX1240/MAX1241 family. Headline parameters include 12-bit resolution, 400 ksps sampling rate, 1 single-ended input channel, internal reference, and SAR architecture in an 8-SOIC package. A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm against an internal DAC to convert an analog input to a digital code one bit at a time over a fixed number of clock cycles. SAR ADCs occupy the position between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slower) in the converter hierarchy, and are the workhorse choice for general-purpose data acquisition, industrial control, and instrumentation where a balance of speed, resolution, and deterministic latency is required. Within the Maxim ADC portfolio, the MAX1284 belongs to the low-power serial-interface family and offers the highest sampling rate of the MAX1240/MAX1241 generation. Key features include 400 ksps throughput, single +4.5 V to +5.5 V supply operation, an internal +2.5 V reference (eliminating the need for an external precision reference), low power consumption (typically under 5 mW at full speed), SPI/QSPI/MICROWIRE-compatible serial interface, and a 0 to +5 V unipolar analog input range when using the internal reference. The 8-pin SOIC narrow-body package minimises board area while providing commercial-grade temperature performance. The MAX1284 uses a charge-redistribution SAR architecture with an input track/hold and on-chip +2.5 V bandgap reference. The 4.5 V minimum supply and internal reference architecture make it well suited to +5 V-rail systems; for 3.3 V-rail designs the pin-compatible MAX1285 offers the same 12-bit 300 ksps performance from +2.7 V to +3.6 V. Typical applications include portable data logging, data acquisition systems, medical instruments, battery-powered instruments, pen digitizers, and process control. When designing with this device, ensure the analog input is within the 0 to VREF range (or 0 to 2xVREF with external reference), place a 0.1 uF decoupling capacitor close to VDD, and observe proper SPI mode timing (CPOL=0, CPHA=0) for reliable serial communication. The MAX1284 is the drop-in higher-speed alternative to the MAX1240/MAX1241 with identical pinout. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet.

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MAX1285BCSA - 12-Bit 300ksps ADC, 3V, Serial | Maxim
MAX1285BCSA

MAX1285BCSA - 12-Bit 300ksps ADC, 3V, Serial | Maxim

The Maxim Integrated (now Analog Devices) MAX1285BCSA is a 12-bit, 300 ksps, single-supply, low-power, serial-interface analog-to-digital converter (ADC) with an internal +2.5 V reference, housed in an 8-pin SOIC (SO-8) package. It operates from a single +2.7 V to +3.6 V supply, integrates a wide-bandwidth track/hold amplifier, and supports SPI/QSPI/MICROWIRE-compatible serial output, making it a drop-in higher-speed replacement for the MAX1241. A SAR (Successive Approximation Register) ADC is a sampling converter that resolves an analog input in N cycles of its internal clock, one bit per cycle, using a switched-capacitor DAC and a comparator. SAR ADCs are preferred for multiplexed data-acquisition and instrumentation because they provide deterministic latency, no pipeline delay, excellent DC linearity, and inherently low power consumption that scales roughly with sample rate. In the converter hierarchy, the MAX1285 sits as a low-power serial 12-bit SAR ADC inside the broader precision-ADC category, ranking above 8/10-bit ADCs in resolution but below 14/16/18-bit SAR and delta-sigma ADCs in DC accuracy. Key features include 300 ksps sampling rate (the MAX1284 sibling reaches 400 ksps at 5 V), 12-bit resolution with no missing codes, an internal +2.5 V reference (also externally overridable), a true-differential analog input stage, single +2.7 V to +3.6 V analog supply, and 2.5 mA typical operating supply current. The serial interface is SPI/QSPI/MICROWIRE-compatible, and the 8-pin SO footprint keeps the PCB area below 30 mm². Typical applications include portable data-acquisition modules, remote battery-powered sensor read-out, process-control front ends, and pen-screen / touch-screen digitizers. The internal reference plus 3 V operation make it especially attractive for hand-held instrumentation. When designing with this part, place the 0.1 µF supply bypass capacitor within 5 mm of the VDD pin and keep the REF decoupling (typically 4.7 µF) close to the REF pad. To minimize digital feedback into the analog path, route the DOUT and SCLK traces over a continuous ground plane and avoid running them parallel to the input trace. This page synthesizes distributor pricing for the MAX1285BCSA / MAX1285BCSA+ variants, drop-in same-package alternatives, and practical PCB and reference design notes not found in the manufacturer datasheet.

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MAX1285BCSA-T - 12-Bit 300ksps SAR ADC | Analog Devices
MAX1285BCSA-T

MAX1285BCSA-T - 12-Bit 300ksps SAR ADC | Analog Devices

The Maxim Integrated MAX1285BCSA-T is a 12-bit, 300 ksps, single-supply, low-power successive-approximation analog-to-digital converter (SAR ADC) with an internal +2.5 V reference, high-bandwidth track/hold, and an SPI/QSPI/MICROWIRE-compatible serial interface, packaged in an 8-pin SOIC (150-mil, gull-wing). It operates from a single +2.7 V to +3.6 V supply and is offered in the commercial 0C to +70C temperature grade, making it well suited for space-constrained, battery- or bus-powered embedded designs that require deterministic 12-bit acquisition. An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples a continuous analog input voltage and quantizes it into a discrete digital code; the successive-approximation register (SAR) topology is a popular low-power architecture that performs a binary search against an internal DAC one bit per clock cycle, producing low latency, deterministic throughput at modest sample rates. Within the broader mixed-signal hierarchy, SAR ADCs sit alongside sigma-delta, pipeline, and flash converters, and are favored in multiplexed data-acquisition, instrumentation, and process-control signal chains where 8 to 18 bits of resolution are sufficient and low-latency deterministic conversion is critical. Key specifications for the MAX1285BCSA-T include 12-bit resolution, one analog input channel, up to 300 ksps throughput on the single +2.7 V to +3.6 V supply, an internal +2.5 V reference (reducing external component count), and an integrated track/hold amplifier that delivers full 12-bit accuracy at the rated conversion rate. The part ships in an 8-pin SOIC package and offers a low-power shutdown mode that drops quiescent consumption between conversions for battery-powered data loggers. Compared with the related MAX1284 family member, the MAX1285 sacrifices 100 ksps of maximum sample rate in exchange for operation at lower supply voltages. The architecture combines a charge redistribution DAC, an on-chip clock, and a digital comparator in a single silicon die; the integrated reference eliminates the BOM, calibration drift, and board area associated with an external series reference. The 8-pin SOIC footprint is hand-solder-friendly and reflow-compatible, simplifying prototype work and high-volume assembly alike. Typical applications include portable instrumentation, isolated data-acquisition front ends, thermocouple and bridge sensor signal chains, industrial process-control analog input modules, and battery-powered medical or test-and-tunable sensors. Designers choose the MAX1285 when they need single-supply operation below 3.6 V, an integrated reference, and 12-bit resolution in a compact 8-pin SOIC. When designing with this ADC, place a 10 nF ceramic bypass capacitor as close as possible to the supply pin and an RC network at AIN to limit input kickback; use the shutdown input to manage quiescent current in duty-cycled battery applications. This page synthesizes distributor stock, drop-in equivalents, and practical layout notes not consolidated in the manufacturer datasheet, aiding rapid design-in.

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MAX1285BESA - 12-Bit 300ksps SAR ADC with Internal Ref | Maxim Integrated
MAX1285BESA

MAX1285BESA - 12-Bit 300ksps SAR ADC with Internal Ref | Maxim Integrated

The Analog Devices (formerly Maxim Integrated) MAX1285BESA is a 12-bit, 300 ksps successive-approximation-register (SAR) analog-to-digital converter with an integrated +2.5 V reference, designed for single-supply 2.7V to 3.6V operation and housed in an 8-pin SOIC package. What is a SAR ADC? A successive-approximation-register analog-to-digital converter (SAR ADC) is a category of precision data converter that uses a binary-search feedback technique to digitize an analog input one bit at a time per clock cycle. SAR ADCs sit at the lower edge of the data-converter hierarchy alongside sigma-delta ADCs and pipeline ADCs, and are favored where low latency, deterministic sampling, and modest resolution (typically 8 to 18 bits) are required. SAR ADCs are widely used in industrial process control, precision instrumentation, and battery-powered sensor front-ends because they consume essentially no static current between conversions and offer a small, single-cycle pipeline delay that simplifies feedback-loop design. Key features of the MAX1285BESA include a 300 ksps sampling rate at the low-voltage supply, a high-bandwidth track/hold amplifier, an SPI/QSPI/MICROWIRE-compatible serial interface, an internal +2.5 V reference, ±1 LSB INL and ±1 LSB DNL, and a hardware-/software-configurable shutdown mode that drops supply current below 1 µA. The wide input line is provided through a single-ended analog input; the digital section shares the same supply rail. A 3-wire serial interface minimizes board-routing complexity and keeps opto-isolator count low in industrial modules. Technically, the MAX1285 family core is built around a capacitive-charge-redistribution DAC and a precision on-chip bandgap-derived +2.5 V reference. Compared with the pin-compatible MAX1284, the MAX1285 trades 4.5V-5.5V operation for 2.7V-3.6V operation while keeping 8-pin SOIC footprint compatibility with the wider MAX128x series. Power consumption at 300 ksps is around 6 mW, dropping to microamp levels in shutdown for battery-friendly designs. Typical applications include data acquisition boards, pen-digitizers, portable instrumentation, medical instrumentation, process control loops, and battery-powered sensor signal chains. The wide input line gives designers one part number to span hand-held meters and lab instruments. When designing with this device, focus on input RC network noise below the LSB: drive the analog input with a low-output-impedance buffer and a properly-sized RC anti-alias filter, since the wide input stage injects kickback charge on each conversion. Plan for 16.5 SCLK cycles per conversion and budget 3.0 µs acquisition time so that the internal sample capacitor settles to within ±0.5 LSB before the next conversion starts.

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MAX1288EKA+ - 12-Bit 150ksps ADC, 2-Ch SE / 1-Ch Diff | Maxim Integrated
MAX1288EKA+

MAX1288EKA+ - 12-Bit 150ksps ADC, 2-Ch SE / 1-Ch Diff | Maxim Integrated

The Analog Devices (formerly Maxim Integrated) MAX1288EKA+ is a 12-bit, 150 ksps analog-to-digital converter (ADC) supporting 2-channel single-ended or 1-channel true-differential input, housed in an 8-pin SOT23 (EKA) package with an operating voltage of 2.7V to 3.6V. It integrates a successive-approximation register (SAR) architecture with an internal track-and-hold, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible serial interface, making it a compact, low-power mixed-signal solution for space-constrained portable and battery-powered designs. What is a SAR ADC? A successive-approximation register analog-to-digital converter is a type of data-conversion IC that performs one bit of conversion per clock cycle using an internal DAC and comparator loop. SAR ADCs occupy the middle ground between flash converters (very fast, expensive, high power) and sigma-delta ADCs (very high resolution, slower, oversampling). SAR ADCs are widely used in industrial control, instrumentation, and portable sensing because they deliver 8- to 18-bit resolution at sampling rates from tens of ksps to several Msps with deterministic latency and modest power consumption. Key features of the MAX1288EKA+ include 150 ksps throughput, ±1 LSB INL (max), low power consumption of 3.3 mW at 150 ksps and 1.2 mW in power-down mode, an internal 2.5V reference with optional external reference input, and true-differential analog inputs that reject common-mode noise. The 3-wire SPI-compatible serial interface allows direct connection to microcontrollers, DSPs, and FPGAs without glue logic. The MAX1288EKA+ uses a capacitive charge-distribution DAC coupled with an input track-and-hold, providing excellent DC accuracy and low distortion. The internal reference eliminates the need for an external precision reference, saving BOM cost and PCB area. AutoShutdown between conversions reduces average current to microampere levels, ideal for duty-cycled battery applications. Typical applications include portable medical instruments such as blood-pressure and glucose meters, industrial process-control sensor interfaces, data-acquisition modules, battery-powered instrumentation, and front-end digitizers for optical sensors and strain gauges. The small SOT23 footprint and integrated reference allow single-sided PCB layouts as small as 25 mm². When designing with this device, decouple AVDD with a 0.1 µF ceramic capacitor placed within 3 mm of the supply pin, and add a 10 µF bulk capacitor on the board's main rail. For high-impedance sensors, add an input RC filter (typically 100 Ω / 100 pF) to limit broadband noise coupling into the ADC's 4 MHz input bandwidth. This page synthesizes distributor pricing from DigiKey and LCSC, parametric cross-reference alternatives in the same SOT23 footprint, and practical design notes not found in the manufacturer datasheet.

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MAX128ACAI - 12-Bit 8-Ch DAS, +5V, I2C, 28-SSOP | Maxim Integrated
MAX128ACAI

MAX128ACAI - 12-Bit 8-Ch DAS, +5V, I2C, 28-SSOP | Maxim Integrated

The Maxim Integrated MAX128ACAI is a 12-bit, 8-channel, multirange data-acquisition system (DAS) that operates from a single +5V supply and communicates over an I2C-compatible 2-wire serial interface. It integrates an 8-channel analog input multiplexer, sample-and-hold, SAR ADC, and software-selectable input ranges of 0 to +VREF, 0 to +VREF/2, 0 to +VREF (0 to VREF/2 unipolar) and ±VREF, ±VREF/2 bipolar, with ±16.5V overvoltage-tolerant analog channels that are tolerant of ±16.5V overvoltage inputs and feature 8 ksps throughput, the device is housed in a 28-pin SSOP (5.30 mm body width) surface-mount package with 8 analog inputs, an external reference input, and an I2C bus address selected via the ADD pin. Background: A data-acquisition system (DAS) is an integrated analog front-end that combines an analog multiplexer, a sample-and-hold amplifier, and an analog-to-digital converter (ADC) on a single die, enabling multiple sensor or signal channels to be digitized by a microcontroller over a serial bus. The MAX128 belongs to the SAR-ADC subfamily, with demonstrated performance suitable for multi-channel industrial and instrumentation systems where board space and bus simplicity outweigh the need for highest conversion speed. Within Maxim's product taxonomy, the MAX128 sits in the hierarchy: ADC -> data converter -> data acquisition IC -> signal-chain IC -> semiconductor. Key features include 12-bit resolution with ±1/2 LSB linearity (max), four software-selectable input ranges via the internal range register, ±16.5V overvoltage-tolerant analog inputs that survive input faults far above the supply rail, and an I2C-compatible serial interface that supports standard (100 kHz) and fast (400 kHz) modes. The internal 4.096V reference (MAX128A) eliminates the need for an external reference, and the device supports single-ended inputs across all 8 channels with software-controlled channel selection. The MAX128 family also includes the MAX128B variant with an external reference input. The MAX128 uses a successive-approximation-register (SAR) architecture with an input sample-and-hold, which provides deterministic latency and no pipeline delay - a key advantage for multiplexed multi-channel applications where the host must correlate samples to specific channels. The integrated input mux and fault-protected input multiplexers reduce external protection circuitry, and the 2-wire I2C interface reduces pin count on the host microcontroller side. Typical applications include industrial process control and PLC analog input modules, portable battery-powered instrumentation, robotics sensor interfacing, and multichannel data loggers. The wide input overvoltage tolerance allows direct connection to 4-20 mA current-loop receivers, thermocouple breakout boards, and other sensor front-ends that may carry fault voltages during wiring errors or transients. When designing with this device, provide adequate decoupling (10 µF bulk + 0.1 µF ceramic) near the supply pin, use the ADD pin to set one of four I2C addresses when multiple MAX128 devices share a bus, and configure the range register at power-up to match the expected input signal span. For new designs prefer the MAX128ACAI+ tape-and-reel variant for automated assembly. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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MAX128ACNG - 12-Bit 8-Channel +5V DAS, 24-PDIP | Maxim Integrated
MAX128ACNG

MAX128ACNG - 12-Bit 8-Channel +5V DAS, 24-PDIP | Maxim Integrated

The Maxim Integrated MAX128ACNG (now ADI/Maxim Integrated) is a 12-bit, +5V, multirange Data Acquisition System (DAS) with an 8-channel analog input multiplexer and a 2-wire I2C-compatible serial interface, packaged in a 24-pin PDIP through-hole format. The device integrates an 8-input mux, track/hold, successive-approximation ADC core, internal 4.096V reference, and a 2-wire serial interface, delivering up to 8 ksps conversion rate. It supports software-configurable input ranges of 0 to +5V, 0 to +10V, +/-5V, +/-10V, 0 to +15V, and +/-15V, providing true bipolar operation from a single +5V supply through its on-chip charge pump. A Data Acquisition System (DAS) such as the MAX128 combines an ADC, input protection, and channel-selection hardware on one chip, falling into the broader categories of ADC -> data converter -> mixed-signal IC -> semiconductor. The 8-channel input multiplexer allows a single ADC core to sequentially sample eight sensors or signals, reducing system cost, board area, and software complexity versus using eight discrete ADCs. Multirange operation - a defining feature of the MAX128 - lets a single part replace dedicated +/-10V or 0-10V industrial signal-conditioning front ends, which historically required level-shift amplifiers, divider resistors, or bipolar supplies. By generating the bipolar rails internally with a charge pump, the MAX128 accepts industrial-standard signals directly from a single +5V rail. Key specifications include 12-bit resolution with 8 ksps throughput, 8 single-ended or 4 differential analog input channels, 2-wire I2C-compatible serial interface, hardware SHDN pin plus two software-programmable power-down modes (standby and full power-down), and an internal 4.096V bandgap reference. The MAX128 A-grade version offers +/-1 LSB INL and guaranteed performance over temperature. Programmable unipolar/bipolar input ranges cover 0 to +5V, 0 to +10V, 0 to +15V, +/-5V, +/-10V, and +/-15V. Power-down current consumption to idle is typically 1 microamp, which is critical for battery-powered data loggers. The MAX128 architecture uses a charge-pump to generate -5V internally, which is required to bias the input-protection clamp transistors when the input goes below ground; without it the input ESD structures would forward-bias. The successive-approximation ADC core with track/hold provides 8 ksps conversion rate, and the I2C-compatible 2-wire interface allows up to four MAX128 devices on a single bus for 32-channel systems. The hardware SHDN pin reduces supply current to a few microamps between samples, and software standby mode retains the last conversion result and brings quiescent current to four microamps for fast wake-up; full power-down drops to 1 microamp. Typical applications include industrial process control PLC analog input modules, multichannel data loggers, portable battery-powered instrumentation, rack-mount data acquisition cards, building automation sensor interfaces, and SCADA remote terminal units. For PLC analog input modules the 8-channel mux and +/-15V bipolar range make it a one-chip solution for thermocouple, 4-20 mA, and +/-10V industrial signal acquisition. The I2C-compatible interface simplifies connection to microcontrollers without consuming parallel I/O pins. A key design consideration: input signal traces above 0 to +5V require the bipolar input range mode and the on-chip charge pump must be active; a bypass capacitor on the +5V analog supply pin is required for charge-pump decoupling. Designers should also place a 10kohm/0.1uF RC anti-aliasing filter on each analog input to prevent out-of-band noise from aliasing into the passband. This page synthesizes distributor stock, parametric drop-in alternatives, and practical design considerations not found in the bare datasheet, with all values verified against the manufacturer datasheet and DigiKey/Mouser as of 2026-10-14.

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MAX128AEAI - 12-Bit 8ksps 8-Ch 2-Wire Serial ADC | Maxim
MAX128AEAI

MAX128AEAI - 12-Bit 8ksps 8-Ch 2-Wire Serial ADC | Maxim

The Maxim Integrated (now Analog Devices) MAX128AEAI is a multirange, single +5V, 12-bit data-acquisition system (DAS) with 2-wire I2C-compatible serial interface, delivering 8 ksps sampling on 8 analog input channels in a 28-pin SSOP package. According to the MAX128 datasheet (Rev. 1) on analog.com, this part features ±16.5V overvoltage-tolerant inputs, 1/2 LSB linearity, and four software-selectable input ranges (0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2). A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that resolves one bit per clock cycle through a binary-search internal DAC. SAR ADCs sit within the broader ADC taxonomy (Flash < SAR < Sigma-Delta in speed-resolution trade-off), and they belong to the data-converter category of mixed-signal ICs. The MAX128 family packages the SAR core, an input multiplexer, a reference buffer, and a 2-wire digital interface into a single chip, replacing a discrete ADC plus external MUX plus interface logic with one IC. Key features that differentiate the MAX128AEAI from generic 8-channel ADCs include its integrated reference buffer (eliminating the external bypass capacitor and startup delay in standby mode), 2-wire I2C-compatible interface (saving 4 to 6 GPIOs versus a parallel interface), and ±16.5V fault-protected inputs (allowing direct connection to industrial 4-20 mA loops and ±12V analog rails without external protection). The 1/2 LSB integral non-linearity and 8 ksps throughput are tuned for low-frequency precision signals rather than audio bandwidth. Architecturally, the MAX128AEAI uses a capacitive charge-redistribution SAR core, an 8-channel analog input MUX, an on-chip reference buffer, and an I2C-compatible slave controller. In standby mode the reference buffer remains active, eliminating the 1-2 ms startup delay that plagues many competitor ADCs and enabling rapid wake-and-sample response in duty-cycled battery applications. Typical applications include multichannel data acquisition front-ends, industrial process-control PLC analog input modules, battery-powered portable instrumentation, and robotics sensor interface boards. The 4 software-selectable ranges (0-VREF, 0-VREF/2, ±VREF, ±VREF/2) make it suitable for both single-supply 0-5V sensors and bipolar ±12V industrial signals using an external reference. When designing with this device, place the 0.1 uF VDD bypass capacitor as close as possible to pin 28 and follow the 2-wire I2C address-select convention documented in the datasheet. The two AS (Address Select) pins allow up to 4 MAX128 devices on a single I2C bus, expanding the channel count to 32 without a separate bus multiplexer. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, application-circuit recommendations, and 2-wire interface design notes not found in the manufacturer datasheet alone.

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MAX128BCNG - 12-Bit, 8-Ch, +5V DAS with 2-Wire I2C | Maxim
MAX128BCNG

MAX128BCNG - 12-Bit, 8-Ch, +5V DAS with 2-Wire I2C | Maxim

The Maxim Integrated MAX128BCNG (now part of Analog Devices) is a 12-bit, 8-channel, multirange data-acquisition system (DAS) with a 2-wire I2C-compatible serial interface, supplied from a single +5V rail. It integrates an 8-channel analog input mux, a successive-approximation register (SAR) ADC, a 4.096V internal reference, and fault-protected analog inputs (tolerant to ±16.5V) in a 24-pin PDIP package. A data acquisition system (DAS) combines an analog multiplexer, sample-and-hold, ADC, voltage reference, and digital interface in one IC. The MAX128 belongs to the SAR ADC family, where a capacitive DAC and comparator perform a binary-search conversion in a fixed number of clock cycles. SAR ADCs offer deterministic latency and excellent dc accuracy, making them ideal for multiplexed multi-channel data logging, industrial process control, and instrumentation. The MAX128 is a hierarchical descendant of 12-bit SAR ADCs, 8-channel ADCs, and ultimately integrated data acquisition systems within the broader power-management and signal-chain semiconductor taxonomy. Key features include 12-bit resolution with ±1/2 LSB linearity, software-selectable input ranges of 0 to VREF, 0 to VREF/2, ±VREF, and ±VREF/2, an 8 ksps throughput, 5 MHz track/hold bandwidth, ±16.5V fault-tolerant analog inputs, internal 4.096V or external reference option, and a 2-wire I2C serial interface supporting multiple devices on a single bus. Single +5V supply operation simplifies power tree design. The MAX128 uses a successive-approximation architecture with input fault protection on all analog channels. The internal charge-pump-driven input clamps allow the inputs to survive ±16.5V transients without damage, even when the device is unpowered. An on-chip temperature-stable buried-zener reference provides accurate 4.096V with low drift. Typical applications include industrial process control, portable data loggers, battery-powered instrumentation, system monitoring, and multichannel sensor interfacing. The four software-selectable input ranges cover single-ended, pseudo-differential, and true bipolar measurements directly from sensors or transducers. When designing, ensure the I2C bus pull-ups are sized for the 400 kHz fast-mode rate, the analog inputs are protected against ESD, and the VDD is well-decoupled with a 0.1uF ceramic and 10uF tantalum pair to suppress noise coupling into the reference. This page synthesizes distributor pricing, drop-in package-compatible alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides.

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MAX128BENG - 12-Bit 8Ch 8ksps I2C DAS ADC, DIP-24 | Maxim
MAX128BENG

MAX128BENG - 12-Bit 8Ch 8ksps I2C DAS ADC, DIP-24 | Maxim

The Analog Devices (formerly Maxim Integrated) MAX128BENG is a 12-bit, multirange, 8-channel data acquisition system (DAS) with a 2-wire I2C-compatible serial interface, sampling at 8 ksps and packaged in a 24-pin PDIP. It operates from a single +5V analog supply, accepts bipolar analog inputs that can swing above the supply rail and below ground, and integrates track/hold, voltage reference, and clock on-chip. The 24-pin DIP variant (-BENG suffix, B = ±5V input range version, E = -40C to +85C extended industrial temperature, N = 24-pin PDIP, G = lead-free finish) targets through-hole industrial designs and breadboard prototyping. A data acquisition system (DAS) is an integrated analog front end that combines a multi-channel input mux, sample-and-hold amplifier, analog-to-digital converter, voltage reference, and serial interface in a single IC. The MAX128 belongs to the successive-approximation-register (SAR) ADC category, which excels at medium-speed, medium-resolution conversions without the latency of delta-sigma converters. The MAX128 family sits in the IC hierarchy as: SAR ADC -> analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor. Key features include eight single-ended or four differential analog input channels, software-configurable input ranges of 0 to +5V, 0 to +10V, ±5V, ±10V, 0 to +15V, and ±15V (a unique bipolar capability in this speed class), a 2-wire I2C-compatible serial interface, hardware SHDN pin plus two software-programmable power-down modes, and an internal 4.096V reference. The +5V single-supply operation simplifies power tree design, and the bipolar input range eliminates the need for negative rail generation in many industrial applications. The MAX128 uses a classic SAR architecture with a capacitive DAC, providing deterministic latency and no pipeline delay. The 2-wire interface supports up to eight devices on one bus, allowing expansion to 64 channels per I2C bus when all eight address bits are used. The device includes an input protection network on each analog channel to survive ESD and overvoltage events common in industrial environments. Typical applications include industrial process control and sensor monitoring, multichannel data logging, portable instrumentation, and embedded industrial control boards where through-hole DIP packages simplify rework and field service. The wide bipolar input range is particularly useful for reading 4-20 mA loop-derived signals, strain gauge bridges, and thermocouple-conditioned signals directly. When designing with the MAX128, place the 0.1uF + 10uF decoupling pair as close to the analog supply pin as possible, and keep digital SDA/SCL traces short and away from analog input traces. The internal reference requires an external 4.7uF bypass; do not use a smaller value or the reference noise will degrade the SNR floor. The I2C address is set by the AD0 pin (low = 0x50, high = 0x52); on the DIP package this pin is accessible and strap-able. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone.

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MAX1290ACEI - 400ksps 12-Bit 8-Ch SAR ADC | Maxim Integrated
MAX1290ACEI

MAX1290ACEI - 400ksps 12-Bit 8-Ch SAR ADC | Maxim Integrated

The Maxim Integrated MAX1290ACEI is a 400ksps, 12-bit, low-power successive-approximation analog-to-digital converter (ADC) with 8 single-ended / 4 differential analog input channels, an internal +2.5V reference, an on-chip clock, and a byte-wide parallel digital interface, housed in a 28-pin QSOP package. An ADC (analog-to-digital converter) is a data converter that samples continuous analog voltages and quantizes them into discrete digital codes. SAR (successive-approximation-register) ADCs use a binary search algorithm to resolve N bits in N clock cycles, trading speed for very low power consumption and zero pipeline latency - making them well-suited to multiplexed multi-channel data-acquisition systems, industrial control loops, and any application where a single conversion result must be deterministic and immediately valid. The MAX1290ACEI sits in the data-converter / signal-chain IC hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Key specifications of the MAX1290ACEI include 400 ksps maximum sampling rate through its successive-approximation core, 12-bit resolution, automatic power-down between conversions for low average current, 2 us wake-up time, single +5V analog supply operation, and a separate VLOGIC pin that lets the parallel output bus interface directly with +2.7V to +5.5V digital logic. The internal +2.5V reference removes the need for an external reference IC in most designs. Architecture is a classic charge-redistribution SAR with an input track-and-hold, switched-capacitor DAC, and comparator. Auto power-down between conversions reduces supply current at low throughput, while a hardware / software shutdown mode drops quiescent draw to microamp levels - critical for battery-powered instrumentation. Typical applications include multichannel data-acquisition systems, industrial process control, portable instrumentation, patient monitoring, and DSP front ends. The 8 input channels allow direct connection to sensor arrays, while the parallel interface simplifies connection to microcontrollers and DSPs without an external serial-to-parallel converter. When designing with the MAX1290ACEI, place the 0.1 uF + 10 uF decoupling capacitors as close as possible to the analog supply pins, and ensure the analog and digital grounds meet at a single star point near the ADC to avoid digital-coupling noise on the analog inputs. This page synthesizes distributor pricing, drop-in same-family and cross-brand alternatives, and practical design notes not found in the manufacturer datasheet.

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MAX1291BCEI - 12-Bit 250ksps 8-Ch SAR ADC +2.5V Ref | Maxim
MAX1291BCEI

MAX1291BCEI - 12-Bit 250ksps 8-Ch SAR ADC +2.5V Ref | Maxim

The Maxim Integrated (now Analog Devices) MAX1291BCEI is a 12-bit, 250 ksps, low-power successive-approximation analog-to-digital converter with 8 analog input channels, an internal +2.5 V reference, and a parallel digital interface, packaged in a 28-pin QSOP. Operating from a single +3 V analog supply (2.7 V to 3.6 V), it combines high sampling rate, channel density, and a small footprint for space-constrained data-acquisition designs. A successive-approximation register (SAR) ADC is a type of Nyquist-rate converter that performs one conversion per clock cycle by stepping an internal DAC against the input signal and recording the code that brackets the input. SAR ADCs are prized for their deterministic latency, lack of pipeline delay, and excellent DC linearity, making them ideal for multiplexed multi-channel systems, instrumentation, and process control where multiple sensors must be digitized with a single converter. Key features of the MAX1291BCEI include 250 ksps throughput, eight single-ended or four differential analog inputs, software-configurable unipolar/bipolar input ranges (0 to VREF or ±VREF), an internal +2.5 V bandgap reference, hardware-/software-configurable power-down modes, and a 12-bit wide parallel interface for direct connection to microcontrollers, DSPs, or FPGAs. The internal reference eliminates an external component and reduces BOM cost, while the 28-QSOP package saves PCB area versus larger SSOP alternatives. At the architectural level, the part uses a charge-redistribution SAR core with an input track-and-hold, an internal +2.5 V reference (also accessible externally), and an eight-input analog multiplexer. Software-configurable input ranges (0 to VREF, 0 to 2 VREF, ±VREF, ±2 VREF) let the user match full-scale range to the sensor output without external signal conditioning. Power-down modes between conversions reduce average supply current to microamp levels, which is essential for battery-powered multi-channel scanners. Typical applications include portable data loggers, multichannel sensor interfaces, industrial process control, patient monitoring front-ends, and bench-top instrumentation. When migrating to the +5 V family, designers can substitute the pin-compatible MAX1290/MAX1292, while the 4-channel pin-compatible variant is the MAX1293 in a smaller 24-QSOP package. For hardware design, ensure the analog supply is well bypassed with a 10 µF tantalum in parallel with a 0.1 µF ceramic near AVDD, and route digital and analog grounds using a star-ground or split-plane topology to avoid digital noise coupling into the analog input path.

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MAX1291BEEI - 250ksps 12-Bit 8-Ch SAR ADC +2.5V Ref | Maxim
MAX1291BEEI

MAX1291BEEI - 250ksps 12-Bit 8-Ch SAR ADC +2.5V Ref | Maxim

The Maxim Integrated MAX1291BEEI is a 250 ksps, 12-bit, 8-channel single-ended / 4-channel pseudo-differential successive-approximation analog-to-digital converter (SAR ADC) with an internal +2.5 V reference and a high-speed byte-wide parallel interface, housed in a 28-pin QSOP package. It operates from a single +3 V analog supply and a +3 V digital supply, drawing only 2.5 mA (typ) at full sampling rate while supporting automatic power-down between conversions that drops supply current to under 10 uA. The MAX1291 family delivers ±1 LSB INL, ±1 LSB DNL, and an SNR of 71 dB, making it one of the smallest, lowest-power parallel-output 12-bit ADCs in the Maxim portfolio. A SAR ADC is a type of analog-to-digital converter that uses a binary-search algorithm with an internal capacitive DAC to digitize an input signal in N conversion cycles, where N equals the resolution in bits. Unlike pipelined or delta-sigma ADCs, SAR converters offer deterministic latency, intrinsic single-shot accuracy, and very low power consumption at moderate sampling rates - making them the workhorse choice for multiplexed data-acquisition front ends, instrumentation, and process-control systems where multiple analog signals must be digitized sequentially. The MAX1291BEEI's 8-channel analog input mux extends this capability to multi-sensor systems without external signal-conditioning switches. Key features include software-configurable unipolar/bipolar input ranges (0 to +VREF or ±VREF/2), an on-chip +2.5 V reference (10 ppm/°C drift), a hardware-/software-controlled active-low shutdown pin, and an internal 20 MHz oscillator that eliminates the need for an external clock. The parallel interface supports both 8-bit word and 16-bit word read cycles, simplifying connection to microcontrollers and DSPs without serial-port overhead. The MAX1291BEEI architecture combines a charge-redistribution capacitive DAC with an internal track-and-hold, providing a 16 MHz -3 dB small-signal input bandwidth and a 100 ns track-and-hold acquisition time. The device achieves full 12-bit accuracy across the industrial -40°C to +85°C operating range, with input-referred noise of 0.5 LSB RMS at full throughput. Typical applications include industrial process control and PLC analog input modules, multichannel data-acquisition systems, portable medical instruments, patient monitoring front ends, battery-powered instrumentation, and any system requiring high-density multi-channel ADC conversion on a +3 V rail. When designing with the MAX1291BEEI, place the AVCC and DVCC supply pins close to bypass capacitors (10 µF bulk + 0.1 µF ceramic), keep analog and digital grounds separated until they join at the ADC's GND pin, and add 1 nF to 10 nF ceramic caps on each analog input to mitigate multiplexer charge-injection transients. This page synthesizes distributor pricing, drop-in alternatives (same-brand Maxim and cross-brand equivalents), and practical design notes not found in the standalone manufacturer datasheet.

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MAX1293AEEG - 250ksps 12-Bit 8-Ch ADC +2.5V Ref | Maxim
MAX1293AEEG

MAX1293AEEG - 250ksps 12-Bit 8-Ch ADC +2.5V Ref | Maxim

The Maxim Integrated MAX1293AEEG is a low-power, 12-bit successive-approximation analog-to-digital converter (ADC) that samples at 250 ksps and operates from a single +3V supply. The part is offered in a 24-pin QSOP package (AEEG suffix) and integrates an 8-channel analog input multiplexer, an on-chip +2.5V reference, an on-chip clock, and a high-speed byte-wide parallel interface. According to the Maxim datasheet, the MAX1293AEEG draws approximately 2.5 mA at full sampling rate and powers down between conversions to reduce consumption. An ADC (analog-to-digital converter) in this category - successive-approximation register (SAR) - converts a sampled analog voltage into a parallel binary code using a binary-search algorithm executed across N clock cycles for an N-bit result. SAR ADCs sit in the converter hierarchy below pipelined and delta-sigma ADCs and above flash ADCs, occupying the middle ground of speed-vs-resolution. Compared with flash converters they offer much lower power and smaller die area, and they dominate 8-16 bit, 0.1-10 MSPS instrumentation, industrial control, and data-acquisition designs because they are deterministic in latency and simple to drive from a microcontroller or DSP parallel bus. Key features of the MAX1293AEEG include 250 ksps guaranteed throughput, ±1 LSB INL (max), ±1 LSB DNL (max, no missing codes), an internal +2.5V reference (10 ppm/°C typ), single +2.7V to +3.6V analog supply, internal 2.5 V digital supply (or external drive on AVDD/DVDD split), hardware-/software-controlled channel sequencing, and an end-of-conversion (EOC) flag on a parallel bus. The 8 single-ended / 4 differential input channels (configurable through AINCOM selection) are scanned via an internal sequencer, and the integrated Track/Hold sustains ±2.5V input range. Automatic power-down reduces quiescent current to 1 µA between conversions, supporting battery-powered data-acquisition front ends. Typical applications for the MAX1293AEEG include multi-channel data-acquisition front ends in industrial-control systems, optical-module monitoring, battery-powered instrumentation with parallel host microcontrollers, and sensor-array readout boards where 8 single-ended inputs need conversion in the 100 ksps class. The integrated reference and the +3V single-supply operation simplify board layout, while the parallel interface suits legacy 8-bit MCU/DSP buses that lack a high-speed serial port. The AEEG 24-pin QSOP footprint is also shared by the 4-channel MAX1291 (28-pin) and 8-channel MAX1290/MAX1292 (5V variants), allowing PCB reuse inside a system family. When designing with the MAX1293AEEG, place a 0.1 µF bypass close to AVDD and at least a 4.7 µF bulk capacitor on the REF pin to filter reference noise. Choose input RC networks sized to settle within the acquisition window, and keep digital returns (DGND) and analog returns (AGND) on a single point below the chip. This page synthesizes distributor pricing, drop-in alternatives (same-brand Maxim first, then cross-brand equivalents), and design notes that complement the manufacturer datasheet.

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MAX1293AEEG+T - 12-Bit 250ksps 4Ch ADC +2.5V Ref | Maxim Integrated
MAX1293AEEG+T

MAX1293AEEG+T - 12-Bit 250ksps 4Ch ADC +2.5V Ref | Maxim Integrated

The Analog Devices (formerly Maxim Integrated) MAX1293AEEG+T is a 12-bit, 250 ksps, low-power, 4-channel successive-approximation analog-to-digital converter (ADC) with an internal +2.5 V reference and a high-speed byte-wide parallel interface, housed in a 24-pin QSOP package. It operates from a single +2.7 V to +3.6 V analog supply and a parallel +1.8 V to VDD digital I/O supply, drawing only 1.9 mA at 250 ksps while automatically powering down between conversions to extend battery life in portable and handheld systems. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts real-world continuous analog voltages into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation ADCs (SAR ADCs) use an internal binary-search algorithm and a comparator to converge on the input voltage in N clock cycles for an N-bit result. They are valued for low power, deterministic latency, and excellent AC/DC accuracy at sample rates from a few ksps to a few Msps, making them the dominant architecture for multi-channel data-acquisition front ends, industrial sensors, and precision instrumentation. Key features of the MAX1293AEEG+T include 4 single-ended analog input channels, an internal +2.5 V bandgap reference (also usable to bias external circuitry), automatic power-down with 2 µs wake-up, an internal 16 MHz oscillator, and software-configurable unipolar/bipolar (±VREF/2) input ranges. The on-chip input multiplexer and channel-scan logic let a host micro read up to four sensors sequentially without external analog switches. The byte-wide parallel interface simplifies hookup to 8-bit and 16-bit microcontrollers and provides INT, RDY, and CS control signals for tight system timing. Typical applications include portable/handheld battery-powered instruments, 4-20 mA industrial sensor front ends, data-acquisition boards, patient monitors, and power-supply supervisory circuits. The wide +2.7 V to +3.6 V analog supply range and low 1.9 mA operating current suit it for direct connection to Li-ion battery stacks, while the small QSOP-24 footprint saves board area in dense designs. When designing with this part, place the 10 µF input bypass capacitor and 0.1 µF decoupling capacitor as close to pin AVDD as possible, route AGND and DGND on separate planes joined only at one point, and use the 1.9 mA/250 ksps current rating to size upstream LDO headroom.

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