ADC/DAC
产品（2518)
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
MAX1294ACEI+T - 12-Bit 420ksps 6-Ch ADC +2.5V Ref | Maxim
The Maxim Integrated MAX1294ACEI+T is a 12-bit, 420ksps, successive-approximation analog-to-digital converter (ADC) with a software-configurable 6-channel single-ended / 3-channel pseudo-differential input multiplexer, an internal +2.5V reference, and a parallel interface, packaged in a 28-pin SSOP (QSOP) with 0.154" (3.90 mm) body width. It operates from a single +5V analog supply, supports an analog input range of 0 to +5V (unipolar) or ±5V (pseudo-differential), and integrates an internal +2.5V reference so most applications need no external reference components. According to the Maxim datasheet, ±0.5 LSB integral nonlinearity (INL) is typical at 12-bit resolution. An SAR ADC is a successive-approximation register converter - a sampled analog input is compared bit-by-bit against an internal DAC, producing a digital code in N conversion cycles for N bits of resolution. The MAX1294ACEI+T combines this SAR core with a programmable input MUX, an internal reference, and a wide parallel interface, eliminating the need for an external analog front-end multiplexer or reference IC. It belongs to the Maxim MAX1294/MAX1295 family of pin-compatible multi-channel precision ADCs that share the same digital interface, simplifying design across channel counts. Key features include 420ksps maximum sampling rate, single +5V supply operation, software-configurable analog input multiplexer (6 SE / 3 PD for MAX1294; 2 SE / 1 PD for MAX1295), internal +2.5V reference (4.5 mA drive capability), low 2.5 mA operating supply current, and software-configurable unipolar/bipolar input ranges. The parallel interface allows direct connection to microprocessors, DSPs, or FPGAs without requiring a serial-port bit-bang routine. Typical applications include multichannel data-acquisition systems, industrial process control, patient monitoring, touch-screen digitizers, and any 5V system requiring simultaneous sampling of multiple analog sensors. The wide input range and integrated reference reduce BOM cost and PCB area. The internal +2.5V reference may also be used to drive external circuitry (e.g., excitation sources for ratiometric sensors). Design consideration: place 0.1µF bypass capacitors close to the AVDD and DVDD pins, keep analog and digital ground returns separated until they meet at a single star-point near the ADC, and tie unused analog inputs to AGND through a low-impedance path to minimize channel-to-channel crosstalk. The MAX1294ACEI+T is the tape-and-reel variant; the MAX1294ACEI+ is the tube (commercial) shipping option - same die, same footprint. This page synthesizes distributor pricing, drop-in same-brand replacements, and practical PCB/decoupling guidance not found in the manufacturer datasheet alone.
MAX1294BCEI - 420ksps 12-Bit 6-Ch ADC | Maxim Integrated
The Maxim Integrated MAX1294BCEI is a 12-bit, 420 ksps analog-to-digital converter with a software-configurable 6-channel single-ended / 3-channel pseudo-differential analog input multiplexer, internal +2.5V reference, and parallel interface, housed in a 28-pin QSOP package. It operates from a single +5V analog supply, delivers ±0.5 LSB linearity, and supports both unipolar and bipolar input ranges through software configuration. The device includes an internal track-and-hold amplifier and a high-speed parallel microprocessor/DSP interface compatible with +5V logic. An ADC (analog-to-digital converter) of the successive-approximation-register (SAR) type operates by sampling the analog input and performing a binary search through an internal DAC to determine the digital output one bit at a time. SAR ADCs are valued for deterministic latency, low latency per conversion, and excellent dc accuracy, making them the workhorse for multiplexed data-acquisition systems, instrumentation, and process-control front ends where many channels must be read at moderate speeds. The MAX1294BCEI sits in the precision, low-channel-count data-acquisition IC category within the broader ADC and power-management semiconductor hierarchy. Key features include 420 ksps throughput, ±0.5 LSB INL/DNL linearity, a software-selectable analog input mux (6 single-ended / 3 pseudo-differential on MAX1294; 2 single-ended / 1 pseudo-differential on MAX1296), an internal +2.5V reference with REF_IN/REF_OUT pins, an analog input range of 0 to +5V unipolar or ±5V bipolar, and +5V single-supply operation. A hardware SHUTDOWN pin reduces supply current to < 10 µA between conversions for power-sensitive multiplexed scans. Architecturally, the device pairs a capacitive-DAC SAR core with an input track-and-hold and on-chip reference buffer. The internal +2.5V reference is trimmed at the factory and accessible at REF_OUT for external use, while REF_IN allows overdriving with an external reference when application noise or drift requirements demand it. Power-down sequencing and analog input discharge are handled automatically between conversion cycles to minimize channel-to-channel crosstalk. Typical applications include industrial process control, multichannel data-acquisition front ends, portable battery-powered instrumentation, and medical instrumentation signal conditioning. Designers choose this part when a small-channel-count, 5V-only, internal-reference SAR ADC with parallel read-out is needed. When designing with this part, place the 10 µF REF bypass and 0.1 µF AVDD decoupling caps within 5 mm of their respective pins and use a single-point analog/digital ground tie to limit multiplexer-crosstalk and reference noise. The parallel interface simplifies FPGA glue logic but consumes more board area than a serial-output ADC in channel-dense designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the MAX1294BCEI that are not aggregated on any single manufacturer or distributor page, so design engineers can shortlist parts faster and reduce bench-iteration cycles.
MAX1294BCEI-T - 420ksps 12-Bit 6-Ch +5V ADC | Maxim Integrated
The Maxim Integrated MAX1294BCEI-T is a 420ksps, 12-bit, +5V analog-to-digital converter with a 6-channel single-ended or 3-channel pseudo-differential input multiplexer, an internal +2.5V reference, and a parallel interface, housed in a 28-pin SSOP (QSOP) package. According to the Maxim datasheet, the part delivers ±0.5 LSB linearity, single +5V operation, and software-configurable input muxing, making it well-suited for high-speed multichannel data acquisition. The "-T" suffix denotes Tape & Reel packaging for high-volume assembly lines. An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation-register (SAR) ADCs like the MAX1294BCEI-T sample-and-hold the input, then use an internal DAC and comparator to converge on the digital code one bit per clock cycle. SAR ADCs sit in the signal chain hierarchy between the analog sensor/front-end and the digital processor, and are favored for their deterministic latency, low power consumption, and excellent DC accuracy compared to delta-sigma or pipeline architectures. Key features of the MAX1294BCEI-T include 12-bit resolution with ±0.5 LSB integral nonlinearity, 420ksps throughput, software-selectable unipolar/bipolar input ranges, an internal +2.5V reference (with REFADJ pin for external trim), and a high-speed parallel interface. The internal reference eliminates the need for an external precision reference, reducing BOM cost and board space while maintaining the noise performance required for industrial and instrumentation applications. Architecturally, the MAX1294 uses a charge-redistribution SAR core with an input track-and-hold amplifier capable of handling fast multiplexed signals. Its low aperture delay and aperture jitter make it suitable for simultaneous-sampling-like accuracy across channels when paired with a fast external mux. The device operates from a single +5V analog supply with a separate VLOGIC supply (3V to 5V) for the parallel bus. Typical applications include industrial process control, multichannel data-acquisition systems, portable instrumentation, motor control feedback loops, and medical patient monitoring. When designing with this part, place a 0.1µF ceramic bypass capacitor close to the VDD pin and a 10µF bulk capacitor on the +5V rail to minimize digital noise coupling into the analog input stages.
MAX1295ACEI+T - 12-Bit 6Ch 265ksps +3V ADC | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1295ACEI+T is a 12-bit, 265 ksps, +3V single-supply successive-approximation analog-to-digital converter (ADC) with a 6-channel single-ended / 3-channel pseudo-differential input multiplexer, an internal +2.5V reference, and a parallel interface. Housed in a 28-pin QSOP (SSOP) package with ±0.5 LSB linearity, the device targets precision mixed-signal data-acquisition front ends. An ADC (Analog-to-Digital Converter) is a data-converter integrated circuit that samples continuous analog voltages and converts them into discrete digital codes for use by microcontrollers, DSPs, and FPGAs. SAR (successive-approximation register) ADCs such as the MAX1295ACEI+T sit in the data-converter hierarchy between flash converters (fast, expensive, low resolution) and sigma-delta converters (very high resolution, slow). They offer an optimal balance of speed, resolution, and power for multi-channel precision sensing. The MAX1295ACEI+T belongs to the broader category of precision ADCs > data converters > mixed-signal ICs > semiconductors. Key features of the MAX1295ACEI+T include 12-bit resolution with ±0.5 LSB integral nonlinearity (INL), 265 ksps maximum sampling rate, software-configurable 6-channel single-ended or 3-channel pseudo-differential input MUX, internal low-drift +2.5V reference, single +3V analog supply operation, low power consumption, and a high-speed parallel digital interface compatible with microcontrollers and DSPs. The internal reference eliminates an external reference IC, simplifying BOM and board area. The MAX1295ACEI+T uses a capacitive charge-distribution SAR architecture with an input track-and-hold. Its +2.5V internal reference achieves low drift across temperature, while the parallel byte/word interface minimises host-side timing complexity. An analog input multiplexer supporting 6 single-ended or 3 pseudo-differential channels is programmed through the digital interface, allowing a single ADC to monitor multiple sensors. Typical uses include portable and battery-powered data-acquisition systems, industrial process-control front ends, multi-sensor monitoring in instrumentation, medical patient-monitoring channels, and any multi-channel precision-sensing application requiring a parallel-interface ADC. The wide input multiplexer count (6/3 channels) makes it particularly attractive where board real estate is at a premium. When designing with the MAX1295ACEI+T, ensure the analog supply is well decoupled and the analog input traces are kept short and guarded from digital switching noise. The internal +2.5V reference requires adequate bypass capacitance close to the REF pin. Verify that the chosen microcontroller/DSP can read the parallel bus at the required conversion rate. This page synthesises distributor stock and pricing data from DigiKey, Mouser, and Octopart, structured drop-in alternatives from the same product family, and practical design notes not found on the manufacturer datasheet cover page.
MAX1295BCEI - 265ksps 12-Bit 6-Ch +3V ADC | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1295BCEI is a 265 ksps, 12-bit, 6-channel successive-approximation analog-to-digital converter (ADC) operating from a single +3V supply, offered in a 28-pin SSOP (QSOP) surface-mount package with parallel interface and an internal +2.5V reference. It delivers ±0.5 LSB integral linearity, software-configurable analog input multiplexer (6 single-ended / 3 pseudo-differential channels), and an integrated +2.5V reference, all in a compact 28-pin package. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous analog voltages and outputs discrete binary codes, bridging real-world sensors (temperature, pressure, strain, current) to digital microcontrollers, DSPs, or FPGAs. Successive-approximation (SAR) ADCs such as the MAX1295 use an internal DAC and comparator to perform a binary search each conversion cycle, providing a strong trade-off between speed, accuracy, and low power. They sit in the broader taxonomy: ADC -> data converter -> mixed-signal IC -> semiconductor. When paired with an internal 2.5V reference, a 12-bit SAR ADC can resolve 2.5V/4096 = 610 µV LSB steps directly with no external reference IC. Key features of the MAX1295BCEI include 12-bit resolution with ±0.5 LSB DNL/INL, software-selectable input channel configuration, hardware- and software-controlled power-down modes (as low as 1 µA typical for battery-friendly designs), an internal 2.5V reference (or external reference override), and a wide digital +3V single-supply rail. The parallel interface connects directly to microcontrollers or ASICs and supports 100 ns minimum data-access time, simplifying timing closure in system-on-chip designs. The MAX1295 family uses a charge-redistribution SAR architecture with an input track-and-hold, supporting single-ended or pseudo-differential conversions. Automatic power-down between conversions plus a fast wake-up time yield a typical supply current of ~1.7 mA at 265 ksps, dropping to ~1 µA in shutdown, which is critical for battery-powered data-acquisition systems. Typical applications of the MAX1295BCEI include multi-channel data acquisition in industrial control loops, portable/battery-powered instrumentation, system monitoring boards, motor-control feedback paths, and process-control sensor interfaces. Designers select this part when 12-bit resolution is enough, multiple sensor channels are required, and parallel (rather than serial) output is desired for fast host-side reads. One design consideration: although the MAX1295 supports both internal and external references, an external reference improves gain accuracy and temperature drift in precision measurements. Use low-impedance source driving and place a 0.1 µF + 10 µF decoupling pair near the supply pin to keep digital switching noise out of the analog front end. This page synthesizes distributor pricing, drop-in same-package alternatives (MAX1294BCEI/MAX1295BCEI+/MAX1295BCEI+T/MAX1295AEEI/MAX1295BEEI), 28-pin pinout data and practical design notes not found in the standalone manufacturer datasheet.
MAX1296ACEG - 12-Bit 420ksps 2-Ch ADC +2.5V Ref | Maxim
The Maxim Integrated MAX1296ACEG is a 12-bit, 420ksps, +5V analog-to-digital converter with 2 analog input channels (single-ended) or 6 channels (single-ended, software-configurable), an internal +2.5V reference, and a parallel microprocessor interface, offered in a 24-pin QSOP package. The C-grade speed variant delivers 420k conversions per second over a 0 to +5V unipolar input range (also configurable for +/-5V bipolar true-differential inputs via the MAX1294 family) with track/hold, internal +2.5V bandgap reference, and low power dissipation of typically 10mW at 420ksps. An ADC is a mixed-signal data converter that samples continuous-time analog signals and produces discrete-time digital codes for downstream processors. The MAX1296 sits in the successive-approximation-register (SAR) ADC category (lower-latency, deterministic, no pipeline delay) which falls within the broader data-converter (ADC/DAC) hierarchy of mixed-signal integrated circuits used in instrumentation, industrial control, and embedded processing. Key features include a maximum sampling rate of 420 ksps (C-grade, AIN-to-acquisition mode), 12-bit resolution with no missing codes, integral nonlinearity (INL) and differential nonlinearity (DNL) errors specified in LSBs in the Maxim datasheet, an internal trimmed +2.5V reference with 50ppm/C typical drift, hardware- or software-controlled channel selection, an active-low end-of-conversion INT output, and a logic-independent +5V analog supply with +3V/+5V digital interface compatibility. The SAR architecture uses an internal binary-weighted capacitor DAC and comparator to perform one conversion in 12 successive approximation cycles, allowing the device to digitize at a fixed throughput independent of input frequency. The on-chip reference eliminates an external 2.5V shunt component and simplifies PCB layout for cost-sensitive multi-channel data-acquisition boards. Typical applications include process control and industrial automation (PLC analog front ends), data-acquisition boards in instrumentation and medical monitoring, optical-network power monitoring (SONET/SDH receive signal strength indication), and digital multimeter / precision sensor signal conditioning. The 24-pin QSOP footprint also suits space-constrained embedded designs. When designing with this device, ensure the analog supply is decoupled with a 0.1uF ceramic plus 10uF tantalum or ceramic bypass within 5mm of AVDD, and that the digital interface signals are referenced to DVDD isolated from noisy digital returns. Channel switching speed and software-mode conversion latency should be modeled against any downstream FIFO or DMA transfer budget. This page synthesizes distributor pricing, parametric drop-in alternatives from the same Maxim ADC family, and practical design notes not consolidated in the manufacturer datasheet alone.
MAX1296AEEG - 420ksps 12-Bit 2-Ch ADC +2.5V Ref | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1296AEEG is a 12-bit, 420 ksps successive-approximation analog-to-digital converter with a parallel interface, an internal +2.5 V reference, and a software-configurable analog input multiplexer, housed in a 24-pin QSOP package. It operates from a single +5 V supply, accepts up to 2 single-ended or 1 pseudo-differential analog input channel, and delivers ±0.5 LSB linearity. The combination of low power consumption, a small footprint, and a parallel output word makes the part a practical choice for embedded data-acquisition front ends. What is a successive-approximation register (SAR) ADC? An SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm against an internal DAC to digitize an input voltage one bit per clock cycle. SAR ADCs occupy the middle of the converter taxonomy between flash (fastest, lowest resolution) and sigma-delta (slowest, highest resolution). The MAX1296AEEG's 420 ksps throughput is typical of mid-resolution SAR ADCs, while its 12-bit resolution positions it above 10-bit mid-tier devices and below 14-/16-bit precision parts. Key features include 420 ksps sampling rate, 12-bit resolution with ±0.5 LSB DNL/INL, internal +2.5 V reference (typically ±1.5% initial accuracy), single +5 V analog supply operation, low power dissipation of approximately 8.3 mA at full speed, and hardware/ software power-down modes that drop quiescent current below 1 µA. The MAX1296AEEG also includes an active-low INT output that tri-states when CS goes high, allowing direct connection to shared microcontroller buses without external glue logic. The architecture combines an input track-and-hold, a charge-redistribution DAC, and a precision comparator with on-chip calibration registers. Power-down is initiated either through hardware (active-low SHDN) or by software command; the internal reference is preserved in software power-down but lost in hardware shutdown. The QSOP-24 footprint occupies roughly 60% of the board area of a standard SO-24, making the part suitable for compact instrument designs where PCB real estate is limited. Typical applications include data-acquisition systems, pen-digitizers and tablet digitizing surfaces, panel meters, portable industrial instrumentation, and medical monitoring front ends. The wide analog input range (0 to VREF or pseudo-differential ±REF) is well-suited to transducer conditioning. When designing with this part, place the 0.1 µF bypass capacitor on AVDN as close to the pin as possible and keep digital traces away from the analog inputs to avoid coupling. The MAX1295/MAX1297 are pin-compatible +3 V variants for systems with lower supply rails.
MAX1297AEEG - 12-Bit 265ksps +3V 2-Ch ADC | Maxim Integrated
The Maxim Integrated MAX1297AEEG (now part of Analog Devices) is a 12-bit, 265ksps, successive-approximation analog-to-digital converter (ADC) with a +3V analog supply and an internal +2.5V reference. It offers a 2-channel single-ended / 1-channel pseudo-differential input multiplexer and a parallel digital interface, and is housed in a 24-pin QSOP package. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous analog voltage and converts it into a discrete digital code for microcontrollers, DSPs, or FPGAs. SAR (successive-approximation register) ADCs such as the MAX1297 sit in the data-converter hierarchy below sigma-delta and pipelined ADCs and above flash ADCs, and are widely used where mid-speed (ksps to Msps) and low-power single-supply operation are required. They belong to the broader precision analog / signal-chain block that interfaces real-world sensors to digital processors. SAR ADCs deliver one conversion per N clock cycles and trade off speed for resolution without the latency of sigma-delta modulators. Key specifications of the MAX1297AEEG include 12-bit resolution with ±0.5 LSB linearity, a +3V single-supply analog operation, an internal +2.5V reference (eliminating an external reference component), and software-configurable input multiplexing. The MAX1297 also provides a hardware-power-down mode and a high-speed parallel interface that simplifies connection to microcontrollers and FPGAs. The MAX1295 is the 6-channel/3-channel version of this family. Architecture: the device uses a charge-distribution DAC and a precision comparator with auto-calibration to achieve ±0.5 LSB INL/DNL, with the internal bandgap reference trimmed to ±2.5V ±0.02% (4 mV). The integrated input mux and track-and-hold minimize external component count, while the parallel bus eliminates SPI/I2C protocol overhead in real-time control loops. Typical applications include data acquisition systems, portable instrumentation, pen tablets and touch-screen controllers, and industrial process controls. The wide single-supply range and internal reference also make it well-suited to battery-powered portable measurement devices. Design tip: provide a low-impedance 0.1 uF ceramic bypass capacitor directly on AVDN and DVDD, and keep the analog input traces short and guarded. Power sequencing (AVDD before DVDD) is recommended when interfacing with mixed-voltage digital controllers. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers evaluate sourcing options and PCB-reuse trade-offs across the MAX1295/MAX1296/MAX1297 family and pin-compatible ADI cross-references.