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MAX153EAP - 1Msps 8-Bit ADC, 1µA Power-Down, 20-SSOP | Maxim
The Maxim Integrated MAX153EAP (now part of Analog Devices Inc.) is a 1Msps, microprocessor-compatible, 8-bit analog-to-digital converter with 1µA power-down current, housed in a 20-pin SSOP package. It features a single-ended input channel, half-flash (flash) architecture, parallel data output interface, and an external reference, making it well suited to high-speed, low-power data acquisition in portable and industrial designs. An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that converts a continuous-time analog voltage into a discrete-time digital code. Half-flash (also called subranging) ADCs use two parallel flash stages of fewer comparators to achieve higher conversion rates than successive-approximation ADCs of similar cost, while maintaining modest die area and power consumption. The MAX153EAP belongs to the SAR/half-flash ADC product category within the broader data converter IC hierarchy, which sits under signal conditioning and data acquisition in the mixed-signal semiconductor tree. Key specifications include 1Msps minimum sampling rate, 8-bit resolution, single 5V analog supply (per the original Maxim datasheet), and an ultra-low 1µA power-down current that enables battery-powered applications to wake, sample a single waveform, and return to sleep between conversions. The half-flash converter delivers 8-bit throughput in a single acquisition with no missing codes, while an external reference allows the user to optimize full-scale range and noise performance for the transducer in use. Typical applications include portable instrumentation, pen-digitizers and touch controllers, remote data loggers, and embedded process control front-ends where a fast 8-bit ADC with a 1µA sleep current extends battery life. The MAX153EAP is widely used as a drop-in upgrade for systems that previously depended on AD7574, AD670, or first-generation AD converter designs requiring higher throughput. When designing with this device, place the 20-SSOP exposed-pad footprint on a board with a solid ground plane and keep analog/digital traces short; bypass VDD with a 0.1µF ceramic capacitor close to the pin. The CS, RD, and INT outputs form a transparent microprocessor-style interface, so the host can poll, interrupt, or strobe conversions without complex configuration. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, helping procurement and design engineers evaluate the MAX153EAP against modern 8-bit ADC options.
MAX153EAP+ - 1Msps 8-Bit ADC | Maxim Integrated | SSOP-20
The Analog Devices (formerly Maxim Integrated) MAX153EAP+ is a high-speed, microprocessor-compatible, 8-bit analog-to-digital converter (ADC) that uses a half-flash technique to achieve a 660 ns conversion time and digitizes at a rate of 1 Msps. Housed in a 20-pin SSOP package, the part operates from a single +5 V supply or dual ±5 V supplies and accepts either unipolar or bipolar analog inputs. An ADC (analog-to-digital converter) is a data-conversion integrated circuit that samples a continuous analog voltage and quantizes it into a discrete digital code. The half-flash architecture used in the MAX153 family combines two flash sections to deliver high throughput at moderate cost compared with full-flash devices. Within the broader taxonomy, the MAX153 sits between successive-approximation and full-flash ADCs as a speed-optimized converter for embedded data-acquisition and instrumentation systems. Key features include 1 Msps sampling, 660 ns conversion time, parallel microprocessor-compatible interface, and a dedicated POWERDN pin that reduces supply current to 1 µA between conversions. The 8-bit resolution provides 1 LSB of approximately 19.5 mV over a 0-5 V unipolar input range. Input range selection between unipolar and bipolar modes, plus an external reference input, make the device flexible for single-ended or differential signal acquisition. Operating temperature range is -40 °C to +85 °C for the E-suffix industrial grade. The MAX153 integrates an input track-and-hold, two 4-bit flash ADCs with 1-bit overlap, an error-correction latch, and a state-machine control logic, accessed through a parallel data bus with standard CS and RD strobe inputs. The half-flash topology halves the comparator count versus a full 8-bit flash, reducing die area and input capacitance while still supporting 1 Msps throughput. Typical applications include digital signal processing front-ends, high-speed data acquisition cards, PC plug-in boards, portable instrumentation, and process-control monitoring where a parallel-output ADC simplifies interface to microprocessors and DSPs. The 1 µA power-down mode also suits battery-powered measurement equipment. When designing with the MAX153EAP+, place 0.1 µF bypass capacitors adjacent to the supply pins and observe the analog/digital ground split recommended in the manufacturer datasheet to preserve dynamic performance at full throughput.
MAX153EAP+T - 8-Bit 1Msps ADC | Maxim Integrated | SSOP-20
The Analog Devices / Maxim Integrated MAX153EAP+T is a high-speed, microprocessor-compatible, 8-bit analog-to-digital converter that uses a half-flash architecture to achieve 660 ns conversion time and a 1 Msps sampling rate. Housed in a 20-pin SSOP package, it accepts either single +5 V or dual ±5 V analog supplies, with unipolar or bipolar input ranges, and includes a POWERDN pin that drops current consumption to a few microamps during idle periods. The half-flash architecture uses two parallel 4-bit flash converters and an internal 2-bit DAC to digitize the input, achieving an 8-bit result in two passes, balancing speed and die size. An analog-to-digital converter (ADC) translates continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. The MAX153 belongs to the successive-approximation and flash ADC family hierarchy, using a half-flash technique that approximates true flash conversion at roughly one third of the die area. Within the broader data converter taxonomy, an ADC such as the MAX153EAP+T is a precision mixed-signal component that bridges analog sensors and digital systems, often feeding digital signal processors, microcontrollers, or instrumentation recording paths. Key features include 8-bit resolution, 1 Msps minimum sampling rate, an external-reference interface, microprocessor-compatible parallel interface (mode 0), and a low shutdown current of approximately 1 µA. The half-flash core achieves a 660 ns conversion time without the power and silicon area penalty of a true 8-bit flash converter. The device supports both AC-specified (1 Msps) and guaranteed-by-design extended-temperature operation, and offers a simple CS-RD write-control interface for direct connection to most microcontrollers. The device operates from a single +5 V supply or dual ±5 V supplies and offers 0 V to +5 V unipolar or ±5 V bipolar analog input ranges. The shutdown mode is engaged by forcing the POWERDN pin LOW, drawing only 1 µA typical, suiting battery-powered data acquisition. Built-in track-and-hold and an external-reference input provide design flexibility for applications needing temperature-compensated or precision references. Typical applications include high-speed digital signal processing, servo control loops, portable or battery-powered data acquisition systems, and communication systems. Industrial grade temperature range covers -40°C to +85°C, while the SSOP-20 footprint simplifies layout in compact designs and is compatible with standard surface-mount assembly lines. Designers should pay attention to the analog and digital supply pins, which must be properly bypassed with 10 µF electrolytic and 0.1 µF ceramic capacitors as close to the pins as possible to achieve the rated SNR. The reference pin requires a low-impedance source such as the MAX152 or a low-noise precision reference to maintain linearity; using a noisy reference will degrade SNR but not necessarily increase INL at 8 bits. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
MAX153EAP-T - 8-Bit 1Msps ADC with 1µA Power-Down | Maxim Integrated
The Maxim Integrated MAX153EAP-T is an 8-bit analog-to-digital converter featuring a 1 Msps sampling rate, half-flash architecture, and a 1 µA power-down mode, housed in a 20-pin SSOP package. It operates from a single +5V analog supply and a +5V digital supply, providing a parallel microprocessor-compatible interface with three-state outputs. The part is offered in tape-and-reel packaging to support high-volume SMT assembly lines. What is an SAR/half-flash ADC? A half-flash (or sub-ranging flash) ADC is a type of analog-to-digital converter that uses two flash stages and a DAC to achieve moderate resolution (in this case 8 bits) at much higher speed and lower power than a full-flash converter. Within the data converter hierarchy, an 8-bit half-flash ADC sits between a parallel flash ADC (fastest, lowest resolution, highest power) and a successive-approximation-register (SAR) ADC (lower power, slowest). Half-flash parts are commonly used as μP-compatible data acquisition front ends where a single +5V supply simplifies board design. Key features include a 1 Msps minimum sampling rate, single +5V operation with an internal 2.5V reference, a track/hold amplifier on the analog input, and an automatic power-down mode that drops quiescent current to 1 µA between conversions. The parallel interface exposes eight data outputs (D0–D7), a high-Z output enable (OE), a read strobe (RD), and a convert start (CONVST) input, enabling direct connection to 8-bit microcontrollers and DSPs without glue logic. The MAX153EAP-T employs an on-chip track-and-hold that relaxes the input bandwidth requirement and preserves signal integrity at full speed. An external reference can replace the internal 2.5V reference for applications requiring tighter absolute accuracy or ratiometric measurements; reference voltage directly scales the input full-scale range. Typical applications include data acquisition systems, portable instrumentation, battery-powered metering, digital oscilloscope front-end digitizers, and process-control I/O cards. Compared with a full-flash ADC the half-flash approach halves the comparator count, materially reducing power consumption and die area. When designing with this device, observe the +5V supply tolerance (typically ±5%) and respect the analog-to-digital setup/hold times listed in the manufacturer datasheet to avoid linearity errors. For battery-powered designs, leverage the 1 µA power-down mode by gating the CONVST signal so the ADC spends most of its time in shutdown. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers compare the part against pin-compatible Maxim Integrated family members and competitor equivalents.
MAX153EPP+ - 1Msps 8-Bit ADC with 1uA Power-Down | Analog Devices
The Analog Devices MAX153EPP+ is a 1Msps, microprocessor-compatible, 8-bit analog-to-digital converter using a half-flash architecture to achieve a 660ns conversion time. The device accepts unipolar or bipolar analog inputs, operates from single +5V or dual ±5V supplies, and is packaged in a 20-pin PDIP. Its power-down function reduces supply current to 1uA, making it suitable for low-power measurement and control systems. MAX153EPP+ is identified as a single-input, single-flash, 8-bit ADC by distributor listings. An ADC is a data-acquisition interface that converts an analog voltage into a digital value for processing by a microprocessor, microcontroller, or other digital controller. The MAX153 belongs to the parallel-output ADC family within the broader data-converter and interface IC hierarchy. It combines a 1Msps sampling capability with an 8-bit resolution and a power-down state, which can help control system power consumption when continuous conversion is not required. The MAX153EPP+ provides a 1Msps conversion rate, 660ns conversion time, 8-bit resolution, one analog input, and 1uA power-down current. These specifications make it suitable for industrial control, instrumentation, sensor acquisition, and embedded systems requiring a direct parallel ADC interface. The manufacturer product page identifies the MAX153 as a production device and lists a starting list price of $14.17 as of 2026-10-30. The half-flash conversion architecture is intended to support microprocessor-compatible interfacing while maintaining a 1Msps sampling rate. The device accepts either unipolar or bipolar input arrangements, giving designers flexibility when conditioning signals from sensors, transducers, dividers, and other analog sources. Its 20-pin PDIP package provides a through-hole mounting option for conventional industrial and laboratory boards. Typical applications include process-control monitoring, laboratory measurement equipment, digital panel meters, sensor interfaces, industrial automation, and embedded data-acquisition systems. In each case, the parallel ADC outputs can be read by a suitable processor bus, while the power-down pin can reduce consumption during inactive periods. Designers should verify signal ranges, timing margins, and processor logic levels against the complete manufacturer datasheet. For a new design, confirm the MAX153EPP+ supply configuration, input range, conversion timing, output coding, and processor interface before layout. The provided data does not include a verified complete pinout, thermal ratings, absolute maximum ratings, or detailed timing tables, so those values should be taken directly from the official MAX153 datasheet rather than inferred.
MAX154AEWG - 8-Bit 4Ch 2.5us ADC w/ Reference | Maxim Integrated
The Maxim Integrated (now Analog Devices) MAX154AEWG is a CMOS high-speed 8-bit analog-to-digital converter (ADC) with four analog input channels, an internal 2.5V reference, and track/hold, housed in a 24-pin wide-body SOIC (SO-24W) package. It delivers a 2.5 us conversion time per channel using a successive-approximation register (SAR) architecture, with the MAX154AEWG/A grade rated for -40 C to +85 C industrial operation. An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples a continuous analog voltage and converts it into a discrete digital code, typically N-bit binary. SAR ADCs use a binary-search successive-approximation algorithm with an internal DAC and comparator, achieving an excellent balance of speed, resolution, and power consumption for data acquisition, instrumentation, and process-control applications. The MAX154 family sits in the hierarchy: SAR ADC -> ADC -> data converter -> mixed-signal IC -> semiconductor. Key features include four single-ended analog inputs (the pin-compatible MAX158 offers eight), a 2.5V internal bandgap reference (5 V external reference also accepted), ratiometric operation, and an on-chip track/hold. The MAX154AEWG provides 1/2 LSB integral nonlinearity and ±1 LSB total unadjusted error, with low-power CMOS design drawing only a few mW during continuous conversion. The MAX154AEWG uses a standard SAR architecture with internal clock generation, allowing simple microprocessor interface through standard CS, RD, and WR control lines. It connects directly to most 8-bit parallel buses without external glue logic. The wide input voltage range (single +5 V supply) and ratiometric capability make it suitable for both absolute and proportional measurements. Typical applications include data acquisition systems, process control, digital signal processing front-ends, multiplexed sensor monitoring, and portable instruments. The four-channel input makes it ideal for low-channel-count multi-signal monitoring without an external MUX. When designing with this device, observe the recommended 0.1 uF decoupling capacitor on VDD, keep analog and digital ground planes separated, and ensure analog inputs stay within the specified input range (0 V to VREF or 0 V to 5 V). This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found on the manufacturer datasheet, giving engineers a single reference for sourcing, comparison, and design-in.
MAX154BCAG+T - 8-Bit 4Ch 400ksps 5V Precision ADC | Maxim
The Maxim MAX154BCAG+T is a CMOS 8-bit, 4-channel, 400 ksps analog-to-digital converter (ADC) with an integrated 2.5 V on-chip reference, housed in a 24-pin SSOP (CAG) package. According to the Maxim MAX154/MAX158 datasheet, this multi-channel ADC features a 2.5 us conversion time, four analog input channels (the MAX158 has eight), and a complete data-acquisition system on chip including track/hold, reference, and three-state output buffers. The B grade (MAX154B) provides +/-1 LSB INL over the commercial 0C to 70C operating range, while the +T suffix indicates Tape & Reel packaging for high-volume assembly. An ADC (Analog-to-Digital Converter) is a data-acquisition IC that translates continuous analog voltages into discrete digital codes, sitting at the boundary between the analog sensor domain and the digital processor domain within the broader signal chain hierarchy of sensor -> analog front end -> ADC -> microcontroller/DSP. The MAX154BCAG+T belongs to the successive-approximation register (SAR) ADC family, the dominant topology for medium-speed, medium-resolution applications up to a few MSPS where deterministic latency and low power consumption matter more than the raw throughput of pipeline ADCs. Its on-chip 2.5 V reference removes the need for an external precision reference IC, simplifying the BOM for cost-sensitive multi-channel systems. Key features include four single-ended analog inputs with software-configurable channel selection, a 2.5 us successive-approximation conversion engine, on-chip 2.5 V reference (and optional external reference mode), three-state digital outputs for direct microprocessor bus interface, single +5 V supply operation with low CMOS power dissipation, and a half-LSB quantization step of 9.8 mV when using the internal 2.5 V reference across the 0 V to 5 V input span. The internal reference also sources up to 5 mA external current, useful for biasing external signal-conditioning circuitry. The MAX154 architecture pairs a capacitive-DAC SAR core with an input track-and-hold and a low-drift buried-zener reference, achieving the +/-1 LSB integral nonlinearity specified for the B grade and providing a complete data-acquisition subsystem in a single IC. The four input channels share a single ADC core through an internal analog multiplexer, reducing silicon cost relative to per-channel dedicated converters at the expense of throughput during sequential channel scans. Typical applications include data-acquisition front ends for industrial process-control PLCs, multi-slot rack-mounted instrumentation, supervisory distribution and data-logging systems, embedded control boards monitoring temperature/pressure/flow sensors, and portable or rack-mount medical-instrument signal chains. The wide supply tolerance and integrated reference also make it attractive for low-cost microcontroller-based measurement nodes. When designing with this ADC, place the 0.1 uF + 10 uF supply bypass capacitors as close as possible to the +VDD and DGND pins to prevent digital noise from coupling into the analog comparator. Use AGND and DGND star-grounding at the IC reference pin, and verify that the source impedance seen at AIN pins stays below 2.5 kohm to keep track-and-hold settling errors below 0.5 LSB at 400 ksps. This page synthesizes distributor pricing, drop-in alternatives from the Maxim MAX154/MAX158 family, and practical design notes not collected in the manufacturer datasheet.
MAX154BCWG - 8-Bit 400ksps 4-Ch ADC with Reference | Maxim
The Maxim Integrated MAX154BCWG is a CMOS 8-bit analog-to-digital converter with 4 analog input channels, an internal 2.5V reference, and a track-and-hold amplifier, housed in a 24-pin SOIC wide-body package with conversion time of approximately 2.5 us per channel via successive-approximation register (SAR) architecture at up to 400 ksps aggregate throughput. What is an ADC? An ADC (Analog-to-Digital Converter) is a data-converter IC that samples continuous analog voltage signals and translates them into discrete binary codes for digital processing. Within the data-converter hierarchy, the MAX154 sits in the SAR branch (low-latency, deterministic-conversion) rather than the delta-sigma or pipeline branches. The MAX154 family (MAX154 4-channel, MAX158 8-channel) is part of Maxim's multi-channel 8-bit ADC portfolio introduced in the late 1980s and remains in production for legacy industrial and instrumentation designs. Key features include four single-ended analog inputs with on-chip channel selection (user-controlled via address latches), an internal 2.5V bandgap reference (10 ppm/°C typical drift), wide ±5V analog input range accepting bipolar signals, and an on-chip clock that simplifies external interfaces. The 24-pin SOIC wide-body package provides ample thermal headroom for industrial environments from 0°C to +70°C (C-grade). Typical applications include multi-channel data-acquisition systems, process-control instrumentation, battery-powered portable test gear, digital panel meters, and embedded industrial-control I/O modules where several sensor signals must be digitized with a single ADC. Compared with modern 12/14/16-bit SAR ADCs, the 8-bit MAX154 trades resolution for very high sample rate and small channel-count BOM cost. Design consideration: place the MAX154 close to the analog signal source to minimize trace noise, use a 0.1 uF ceramic bypass capacitor at VDD with a 10 uF bulk cap, and buffer the analog inputs with op-amps when the source impedance exceeds 5 kohm. The internal reference can be overdriven by an external reference for applications needing tighter absolute accuracy. This page consolidates distributor pricing, drop-in alternatives, and practical design notes not found in the Maxim datasheet alone.
MAX155ACPI+ - 8-Ch 8-Bit 250ksps ADC w/ Simultaneous T/H | Maxim
The Maxim Integrated (Analog Devices) MAX155ACPI+ is an 8-bit, 250 ksps, 8-channel successive-approximation analog-to-digital converter (ADC) with simultaneous track-and-hold stages and an internal 2.5 V reference, housed in a 28-pin PDIP (300 mil) through-hole package. It integrates eight sample-and-hold amplifiers so that all input channels are sampled at the same instant, eliminating channel-to-channel timing skew in multiplexed data-acquisition systems. When operating from a single +5 V supply, the MAX155ACPI+ supports both unipolar and bipolar conversions in single-ended or differential input configurations, with 4 or 8 input channels selectable via software. The device features power-down capability for low-power standby between conversions, an internal +2.5 V reference, and a parallel data interface for high-throughput microprocessor connections. According to the manufacturer datasheet, the MAX155 provides a complete sampling data-acquisition system on a single chip, making it suitable for multi-sensor measurement systems where timing alignment is critical. A successive-approximation register (SAR) ADC is a type of analog-to-digital converter that uses a binary search algorithm to resolve an analog input voltage into a digital code, one bit per clock cycle. SAR ADCs are characterized by low latency (no pipeline delay), deterministic conversion time, and excellent DC accuracy, making them well-suited for multiplexed multi-channel systems, precision DC metering, industrial process control, and data-acquisition front-ends. The MAX155's simultaneous sampling T/Hs set it apart from a generic 8-channel SAR: by capturing all eight inputs at the same moment, downstream digital processing can compute true per-sample differential measurements across the array. Key features include 250 ksps aggregate throughput (with simultaneous sampling across all channels), an internal 2.5 V reference with low drift, software-selectable 4-/8-channel operation, single +5 V supply operation, on-chip T/H per channel, parallel microprocessor interface, and a hardware power-down pin that reduces supply current between conversions. The wide input range supports both single-ended (0-VREF) and true bipolar (±VREF) signals. The MAX155 is built on a BiCMOS process that combines low-noise bipolar analog front-ends with CMOS logic for low power dissipation. Internal clock generation and a self-calibrating architecture minimize external component count, while the parallel interface allows direct connection to microprocessors and FPGAs for high-speed system integration. Typical applications include multi-channel instrumentation and data-acquisition systems, vibration and modal analysis, motor control feedback loops, multichannel process control, medical monitoring front-ends, and any system where multiple analog signals must be sampled simultaneously for time-coherent analysis. When designing with the MAX155ACPI+, ensure the analog input source impedance stays below the value specified in the datasheet to maintain acquisition accuracy. Decouple VDD and AVDR with 10uF tantalum and 0.1uF ceramic capacitors placed close to the pins, and keep analog and digital grounds tied to a single star point to minimize crosstalk. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including cross-brand comparison and pinout reference.
MAX155AEWI - 8-Ch 8-Bit ADC Simultaneous T/H +2.5V Ref
The Analog Devices (formerly Maxim Integrated) MAX155AEWI is a high-speed, 8-channel, 8-bit analog-to-digital converter that integrates simultaneous track-and-hold amplifiers, a precision +2.5 V internal reference, and a parallel interface in a 28-pin wide SOIC package. It performs successive-approximation conversions at throughput up to 250 ksps and supports unipolar/bipolar, single-ended/differential input modes from a single +5 V supply. An ADC (analog-to-digital converter) converts continuous analog signals into discrete digital codes, sitting between analog front-ends and digital processing blocks in any data-acquisition system. A successive-approximation register (SAR) ADC, the architecture used in the MAX155, performs bit-by-bit decisions against a reference in a single conversion clock cycle, trading high speed for moderate resolution. ADCs are a sub-category of data converters within the broader mixed-signal semiconductor family; the MAX155 adds simultaneous track-and-hold, an important innovation that lets up to 8 inputs be sampled within a few hundred nanoseconds of each other - critical for phase-coherent multichannel measurements where channel-to-channel skew would otherwise corrupt the result. Key features include eight single-ended or four differential analog input channels, software-configurable unipolar/bipolar ranges, a +2.5 V internal bandgap reference (with optional external reference input), a throughput rate of 250 ksps with 6 microsecond conversion time, and power-down control that drops supply current to under 50 microamps for battery-sparing designs. The MAX155AEWI variant is specified for the -40 °C to +85 °C extended industrial temperature range and is offered in a wide-body 28-SOIC package for robust surface-mount assembly. Inside the device, eight input track-and-hold blocks feed a single shared SAR core and DAC reference ladder; the +2.5 V reference is buffered and brought out to a pin for use by external sensor bridges or ratiometric networks, eliminating a separate reference IC. The parallel interface separates conversion control (WR) from data retrieval (RD), and the channel configuration RAM is addressable through a shared 8-bit bus - this dual mode was a common Maxim innovation in early 1990s data-acquisition parts and is still quoted in modern designs as a clean way to multiplex a single bus. Typical applications include multi-channel data-acquisition front-ends in industrial process instrumentation, sensor array digitizers where simultaneous sampling is required (load-cell weigh scales, vibration monitoring, multi-phase power metering), portable instrumentation powered from +5 V rails, and embedded digital-control loops. The wide SOIC package, single-supply operation, and integrated reference make the part especially attractive for space-constrained designs that need many sampled channels. When using the MAX155AEWI, ensure that the analog inputs remain within the common-mode range of the track-and-hold amplifiers (typically VDD - 1.5 V to GND) and that decoupling includes a 10 microfarad bulk capacitor plus a 0.1 microfarad ceramic close to each supply pin. Because the +2.5 V reference is brought out to a pin, it must be buffered with an op-amp if used to drive low-impedance loads. This page consolidates distributor pricing, drop-in alternatives such as MAX155AEWI+, MAX155ACWI, MAX155BEWI and MAX155BCWI, plus practical design notes not found in the manufacturer datasheet.
MAX155BEPI+ - 8-Channel 8-Bit 250ksps SAR ADC | Maxim Integrated
The Maxim Integrated MAX155BEPI+ (now supplied by Analog Devices) is a high-speed, 8-bit, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with 4 or 8 single-ended/differential analog input channels, integrated simultaneous track-and-hold amplifiers, and an internal 2.5V reference, packaged in a 28-pin plastic DIP (PDIP-28) through-hole package. It delivers sampling rates up to 250 ksps and is qualified for the -40C to +85C industrial temperature range, with the "B" speed grade distinguishing it from the slower "A" grade (the "EPI" suffix denotes the industrial temp PDIP package). A SAR ADC is a type of analog-to-digital converter that converts an analog input into a digital code using a binary-search successive-approximation register. SAR ADCs sit in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> integrated circuit. They are favored over delta-sigma and pipeline ADCs when the application needs low latency, deterministic acquisition time, and moderate-to-high sampling rates without pipeline delay, making them common in industrial multiplexing, motor control, and instrumentation loops. The key differentiating features of the MAX155 are its eight simultaneous track/hold amplifiers (one per channel) that eliminate channel-to-channel sampling skew, the internal precision 2.5V reference (saving board space and BOM cost), and a flexible parallel data interface compatible with most microcontrollers and DSPs. Each input channel can be configured as single-ended or differential, and an analog multiplexer under software control selects which channel the SAR core digitizes while all eight T/Hs sample at the same instant. Architecturally, the device combines an 8:1 input MUX, eight dedicated sample-and-hold capacitors, a single shared SAR core, an internal reference buffer, and a parallel output register. This "MUX + simultaneous T/H" topology trades simultaneous-snapshot timing accuracy (typically <50 ns channel-to-channel skew) for the throughput ceiling of one ADC core. The "B" grade offers the fastest conversion time in the MAX155 family. Typical applications for the MAX155BEPI+ include industrial process control data acquisition boards, multi-axis motor position feedback, multiplexed thermocouple or strain-gauge signal chains, simultaneous-sampling vibration/acoustic analyzers, and embedded instrumentation front-ends. The DIP-28 package is friendly to breadboard prototyping, legacy through-hole designs, and educational lab work where surface-mount packages are inconvenient. When designing with this part, ensure the analog inputs remain within the supply rails (typically +/-5V or 0-5V with VDD=+5V, VSS=-5V) and add a 10 nF ceramic bypass on the reference pin to maintain low-noise conversions. Because the part is now in Last Time Buy status per distributor listings, consider the MAX155BEWI+ (SOIC-28) or other drop-in-compatible ADC alternatives listed below for new production runs. This page synthesizes distributor pricing, drop-in compatible 8-channel SAR ADC alternatives, and practical layout/design notes not aggregated in the manufacturer datasheet alone.
MAX156BCNG - 8-Ch 8-Bit 250ksps ADC w/ T/H | Maxim Integrated
The Maxim Integrated MAX156BCNG is an 8-bit, 8-channel successive-approximation analog-to-digital converter (ADC) with simultaneous track-and-hold amplifiers and an internal 2.5V reference, sampling at up to 250 ksps in a 24-pin PDIP through-hole package. It integrates two or four input channels (selectable via software) with dual simultaneous sample-and-hold stages that capture two analog signals at exactly the same instant, eliminating inter-channel skew in vector measurements. The device operates from a single +5V analog supply plus a digital 5V supply and features a parallel microprocessor interface for fast data transfer. A successive-approximation ADC is a type of data converter that resolves each conversion one bit at a time using an internal binary-search algorithm, offering a favorable trade-off between speed, resolution, and die size compared to flash or sigma-delta architectures. SAR ADCs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. The MAX156's 8-bit resolution and 250 ksps throughput place it in the mid-speed data-acquisition tier used for instrumentation, video digitizing, and DSP front-ends where 8-bit dynamic range is acceptable. Key features include 8 input channels (software-configurable as 2 or 4 single-ended inputs or differential pairs), simultaneous track-and-hold for paired channels, internal +2.5V reference with external override option, single +5V analog supply plus digital 5V supply, and a parallel interface compatible with most microprocessors. The device guarantees no missing codes over the full operating temperature range and provides ±1 LSB linearity. Typical applications include multichannel data-acquisition systems, simultaneous-sampling instrumentation, DSP front-end analog input stages, industrial process control with multiple sensors, and portable or benchtop test equipment. The internal reference simplifies BOM and layout while keeping the device suitable for cost-sensitive multi-channel designs.
MAX156BENG - 8-Ch 8-Bit 250ksps ADC with T/H | Maxim Integrated
The Maxim Integrated MAX156BENG is a high-speed, 8-channel, 8-bit analog-to-digital converter with simultaneous track-and-hold amplifiers and an internal 2.5V reference, housed in a 24-pin PDIP (DIP-24) through-hole package. It supports throughput up to 250 ksps per channel (278 ksamples/sec aggregate sample rate is reported by some distributor sources) and operates from a single 4.75V to 5.25V analog supply with low 2.7 mA operating current. The MAX156BENG targets multiplexed data-acquisition front-ends where simultaneous sampling of multiple analog inputs is required. A successive-approximation ADC (SAR ADC) is a type of analog-to-digital converter that resolves one bit per clock cycle using a binary search across an internal DAC and comparator, achieving a deterministic conversion time and low latency. The simultaneous track-and-hold front-end on every channel captures all inputs at exactly the same instant, preserving phase relationships between channels - critical for multi-phase power, vibration analysis, and motor-control feedback. This places the MAX156 in the data converter hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Key features include 8 single-ended analog input channels, an internal 2.5V reference, input range of 0V to +2.5V unipolar or ±2.5V bipolar (with external reference and signal conditioning), and software-configurable unipolar/bipolar operation per the device datasheet. The +2.5V reference output can drive external circuitry. The MAX156BENG is the through-hole commercial-temperature variant (0C to +70C); the MAX156BENG+ suffix denotes the industrial-grade (-40C to +85C) version. The 24-pin PDIP footprint supports breadboard-friendly prototyping and easy hand-solder rework. Architecture: an input multiplexer feeds eight track-and-hold amplifiers whose outputs connect to a single SAR core with an integrated reference. Conversion control is via a standard microprocessor-compatible parallel interface with read, convert, and chip-select signals. The device dissipates approximately 13.5 mW at 5V/250 ksps and powers down between conversions for battery-friendly operation. Typical applications include multi-channel data acquisition systems, industrial process control, vibration and modal analysis, motor control phase-current sampling, portable instrumentation, and automated test equipment front-ends. The 250 ksps/channel rate comfortably digitizes audio-bandwidth signals from 8 sensors simultaneously. Design considerations: place 0.1uF bypass capacitors close to VDD and VSS pins; route analog and digital grounds as separate planes tied at a single point near the ADC. The internal reference requires an external capacitor for noise filtering - consult the datasheet for the recommended value. Choose the MAX156BENG+ (industrial grade) for outdoor or industrial environments; the MAX156BENG without suffix is rated 0C to +70C only. This page synthesizes distributor pricing from DigiKey, Mouser and LCSC, drop-in same-package alternatives from the MAX15x and MAX12x Maxim ADC families, and practical layout notes not consolidated in the manufacturer datasheet.
MAX157ACUA - 10-Bit 108ksps 2-Ch SAR ADC | Maxim Integrated
The Maxim Integrated (now Analog Devices) MAX157ACUA is a low-power, 2-channel, 10-bit successive-approximation analog-to-digital converter (ADC) operating from a single +2.7V to +5.25V supply and housed in an 8-pin µMAX (UMAX) surface-mount package. According to the Maxim datasheet, the device delivers a 108 ksps sampling rate through a 7.4 µs successive-approximation conversion engine and features automatic power-down between conversions to extend battery life in portable applications. The MAX157ACUA communicates with a host microcontroller over an SPI/QSPI/MICROWIRE-compatible serial interface. An SAR ADC (Successive-Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary search algorithm combined with an internal DAC to convert an analog input to a digital code, typically one sample at a time with no pipeline latency. SAR ADCs sit within the broader hierarchy of analog-to-digital converters, alongside delta-sigma, pipeline, and flash architectures; they are valued for low power consumption, deterministic latency, and good DC accuracy at moderate sampling rates, making them well-suited for instrumentation, sensor read-out, and embedded data-acquisition designs. Key differentiating features of the MAX157ACUA include a 2-channel input mux (2 analog inputs selectable through software), an integrated +2.5V reference (factory-trimmed, with REF option on select variants), an external reference input for flexibility, low operating supply current, and hardware/software shutdown mode that drops the supply current to < 1 µA in standby. The wide 2.7V-5.25V supply range permits operation directly from a single-cell Li-ion battery or a 3.3V/5V regulated rail. Architecturally, the MAX157ACUA employs a charge-redistribution DAC with a built-in sample-and-hold, controlled by an SAR logic core that produces 10-bit results over four internal clock cycles. The device supports both unipolar (0-VREF) and pseudo-bipolar (VREF/2 offset) input ranges when driven in two's-complement mode, providing flexibility for single-supply signal-chain applications. Typical applications for the MAX157ACUA include portable data loggers, battery-powered sensor read-out boards, industrial process-control loops, panel meters, and embedded system front-ends where low power and small footprint matter more than extreme sampling speed. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone. When designing with this device, place a 0.1 µF decoupling capacitor close to the VDD pin and a 10 µF bypass on the reference output if the internal reference is used. Operating at the higher 5 V supply yields the best dynamic range, but always observe the absolute-maximum VDD rating from the datasheet.
MAX157ACUA+T - 10-Bit 108ksps 2-Ch SAR ADC, 8-uMAX | Maxim Integrated
The Maxim Integrated MAX157ACUA+T is a low-power, 10-bit, 2-channel, 108 ksps successive-approximation analog-to-digital converter (ADC) in an 8-pin µMAX/uSOP package with tape-and-reel packaging. It operates from a single +2.7 V to +5.25 V supply and consumes only 1.3 mA at full sampling rate, dropping to under 1 µA in its automatic power-down mode between conversions. A SAR (Successive-Approximation Register) ADC is a type of Nyquist-rate data converter that performs one binary search per clock cycle to resolve the input voltage against an internal DAC. SAR ADCs sit in the converter hierarchy as a sub-class of ADC -> data converter -> mixed-signal IC, alongside delta-sigma, pipeline, and flash architectures. Because SAR converters sample on demand and present a single conversion result per start pulse, they are the dominant topology for multiplexed multi-channel low-latency acquisition in micro-controller-based embedded designs, where the converter is co-located with a SPI/QSPI/MICROWIRE host. Key features of the MAX157ACUA+T include two single-ended analog input channels (AIN1, AIN2) selected via software, an on-chip +4.096 V reference (no external reference required for absolute measurements), an internal 4 MHz oscillator, a 7.4 µs successive-approximation core, and a serial interface compatible with MICROWIRE, QSPI, and SPI-compatible hosts. The +T suffix denotes tape-and-reel packaging for high-volume SMT assembly. The MAX157ACUA+T is intended for battery-powered and space-constrained systems where both low power and small PCB footprint matter. Typical applications include portable data loggers, sensor signal conditioning, loop-powered 4-20 mA transmitters, handheld instrumentation, and battery management monitoring where a 10-bit result is sufficient. The internal reference and 2-channel input multiplexer eliminate the external reference and analog switch, reducing BOM cost and board area. Designers should note the 8-pin µMAX footprint and the SPI/QSPI-compatible 4-wire serial interface. Because the device is a SAR converter, an external anti-aliasing RC low-pass filter on each analog input is recommended when wideband noise exceeds the Nyquist frequency relative to the 108 ksps sampling rate. This page synthesizes distributor pricing from DigiKey and Octopart, drop-in replacement cross-references from same-family Maxim parts, and design considerations not found in the manufacturer datasheet, including external reference options and analog front-end filter recommendations for the 108 ksps sample rate.
MAX157AEPA - 108ksps 10-Bit 2-Ch Serial ADC | Maxim Integrated
The Maxim Integrated MAX157AEPA is a +2.7V, low-power, 2-channel, 108ksps, serial-interface, 10-bit analog-to-digital converter (ADC) housed in an 8-pin PDIP package. The "EPA" suffix denotes the PDIP-8 industrial-temperature grade variant, while the closely related MAX157AEPA+ adds lead-free/RoHS-compliant processing and the MAX157BCPA/MAX157BEPA offer the commercial and extended-temperature grades respectively. It features a successive-approximation register (SAR) ADC core with a 7.4 microsecond conversion time, automatic power-down between conversions, and an SPI/QSPI/MICROWIRE-compatible serial interface that minimizes microcontroller pin count. An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that converts a continuous analog input voltage into a discrete digital code word. SAR ADCs use a binary-search algorithm implemented with a capacitive DAC and comparator to digitize each sample in N clock cycles for N-bit resolution, providing an excellent trade-off between speed, accuracy, and power. The MAX157AEPA belongs to the SAR ADC sub-family within the broader data-converter hierarchy (ADC -> data converter -> mixed-signal IC -> semiconductor). The MAX157/MAX159 family specifically targets low-power, multi-channel, serial-output applications where PCB area and quiescent current are at a premium. Key specifications include a single +2.7V to +5.25V analog supply range, two true-differential or single-ended input channels (the MAX159 variant is single-channel true-differential; the MAX157 offers two single-ended channels), an integrated +4.096V or external reference option, an INL of plus or minus 0.5 LSB, a DNL of plus or minus 1 LSB, an operating current of approximately 1.2 mA at full speed, an automatic power-down current of typically under 1 microamp between conversions, and an industrial operating temperature range of -40C to +85C. The serial interface runs at clock rates up to approximately 2.5 MHz to support the 108 ksps throughput, and the part accepts either an internal 2.5V reference or an external reference up to VDD. Architecturally, the MAX157AEPA uses a charge-redistribution SAR ADC with input track-and-hold, an on-chip clock, and a digital serial engine that streams out MSB-first data. The internal reference and reference-buffer architecture provide low drift across temperature while keeping the external component count to a single bypass capacitor. Hardware shutdown control through the active-low SHDN pin combined with automatic wake-up between conversions makes the part well-suited to battery-powered data logging, portable instrumentation, and loop-powered sensor transmitters where average current dominates battery life. Typical applications include portable battery-powered data acquisition, pen-digitizers and touch-screen controllers, portable medical instruments, isolated industrial sensor front-ends, loop-powered 4-20 mA transmitters, and instrumentation clusters. The wide supply range and low quiescent current also suit automotive body controllers and HVAC sensor interfaces where the part operates directly from a regulated 5V or 3.3V rail. When designing with the MAX157AEPA, place the 10 microfarad and 0.1 microfarad supply-bypass capacitors as close as possible to the AVDD and DVDD pins and route the analog and digital grounds to a single star-ground point to avoid digital switching noise coupling into the analog input. For best noise performance, configure the input in single-ended unipolar mode and use the on-chip 2.5V reference rather than an external rail-divider. This page synthesizes distributor pricing, drop-in same-package and same-brand alternatives, and practical PCB layout notes not found in a single distributor product page.
MAX157BCPA - 10-Bit 108ksps 2-Ch Serial ADC | Maxim Integrated
The Maxim Integrated MAX157BCPA is a 10-bit, 2-channel, 108 ksps successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin PDIP package, operating from a single +2.7V to +5.25V supply. It integrates automatic power-down, a fast 2.5 µs wake-up, an on-chip clock, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible serial interface, consuming only 3.2 mW at VDD = +3.6V during continuous conversion. An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm and an internal capacitive DAC to resolve an analog input to N bits in N clock cycles. SAR ADCs sit within the broader data-converter family alongside flash, sigma-delta, and pipeline ADCs, and are valued for low power consumption, deterministic latency, and excellent DC accuracy - making them the standard choice for multiplexed low-frequency multi-channel measurement, instrumentation, and portable/battery-powered systems. Key specifications include 108 ksps sampling rate, 7.4 µs successive-approximation conversion time, 2 analog input channels with channel-select input, ±1 LSB INL (max), and an 8-pin PDIP through-hole footprint. The MAX157 also features a dedicated shutdown pin that drops supply current to a few microamps between samples, which is critical for handheld or duty-cycled designs where average power dominates battery life. Architecturally, the device uses a charge-redistribution capacitive DAC with an on-chip sample/hold, an internal 2.5 MHz oscillator for conversions, and a straight binary output code. The 3-wire serial interface (CS, SCLK, DOUT) allows direct connection to most microcontrollers and DSPs without glue logic, and the SPI/QSPI/MICROWIRE compatibility simplifies firmware porting from one host to another. Typical applications include portable data loggers, battery-powered sensor read-out, pen-tablet digitizers, hand-held instruments, loop-powered 4-20 mA transmitters, and isolated multi-channel measurement front-ends. The wide +2.7V to +5.25V supply range supports both 3.3V and 5V MCU rails, and the two-channel mux allows dual-sensor sampling (e.g., temperature + pressure) with a single ADC. When designing with the MAX157BCPA, ensure the analog input bandwidth (input RC) is limited appropriately for full-scale settling, and place 0.1 µF bypass capacitors close to the supply pin. Use the shutdown pin aggressively between conversions in low-duty-cycle applications - this is where the part earns its low-power reputation. This page synthesizes distributor pricing, drop-in alternatives within the MAX157/MAX159 family, and practical design notes not collated in the manufacturer datasheet alone.
MAX157BEPA - 10-Bit 108ksps 2-Ch Serial ADC | Maxim Integrated
The Maxim Integrated MAX157BEPA is a +2.7V, low-power, 2-channel, 108 ksps, 10-bit successive-approximation analog-to-digital converter (ADC) housed in an 8-pin PDIP (DIP-8) through-hole package. The MAX157BEPA delivers a single-ended analog input, on-chip 4.096 MHz oscillator, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible serial interface that streams conversion results directly to a microcontroller or DSP. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that quantizes a continuous analog voltage into a discrete digital code. Successive-approximation ADCs use an internal DAC and comparator to binary-search the input against reference-derived levels, trading off conversion speed against die area and power. The MAX157BEPA belongs to the successive-approximation ADC family, which is the dominant topology for general-purpose 8-to-16 bit industrial data-acquisition and instrumentation applications because it delivers a deterministic conversion time and low latency compared with delta-sigma converters. Key specifications include 2 single-ended input channels, 10-bit resolution, 108 ksps maximum sampling rate, 7.4 µs successive-approximation conversion time, automatic power-down between conversions, fast 2.5 µs wake-up, on-chip clock, and 3-wire serial output. Operating from a single +2.7V to +5.25V supply, the part consumes only 3.2 mW at VDD = +3.6 V at full sampling rate and drops to microamp-level standby current in power-down mode, making it well suited for battery-powered and energy-harvesting designs. The MAX157BEPA uses a classic switched-capacitor charge-redistribution SAR architecture with an input track-and-hold, internal reference, and an on-chip 4.096 MHz oscillator. This architecture provides excellent linearity, low aperture uncertainty, and deterministic throughput at 108 ksps, supporting both single-shot and continuous conversion sequences without external clock conditioning. Typical applications include portable data loggers, handheld multimeters, industrial process transmitters, weigh scales, isolated sensor front-ends, panel meters, and consumer measurement equipment. The DIP-8 package suits prototype breadboarding, through-hole production, and socket-based test fixtures where surface-mount parts are impractical. Designers favor this part for its small footprint, single-supply operation, and easy 3-wire interface. When laying out the PCB, keep analog and digital ground returns short and join them at one star point near the ADC GND pin. Place a 0.1 µF decoupling capacitor within a few millimeters of the VDD pin and a 10 µF bulk cap on the supply for low-noise operation. The input source impedance should stay under 5 kΩ to preserve linearity; add an input buffer if your signal source exceeds this limit. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including thermal performance, PCB layout recommendations, and a side-by-side comparison against the MAX157BEPA+ and MAX159 same-family variants.
MAX157BEPA+ - 10-Bit 108ksps 2-Ch Serial ADC | Maxim Integrated
The Analog Devices / Maxim Integrated MAX157BEPA+ is a +2.7V, low-power, 2-channel, 108ksps, serial 10-bit successive-approximation analog-to-digital converter (ADC) housed in an 8-pin PDIP (through-hole DIP) package. The device integrates a precision 2-channel analog input multiplexer, a sample-and-hold amplifier, an on-chip clock, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible serial interface in a single monolithic IC, drawing only 3.2 mW at VDD=+3.6V at full sampling rate. A successive-approximation ADC (SAR ADC) is a type of analog-to-digital converter that uses a binary-search algorithm against an internal capacitive or resistive DAC to digitize an analog input one bit at a time per clock cycle. SAR ADCs deliver deterministic latency, no pipeline delay, and excellent DC accuracy at moderate sampling rates (typically up to a few Msps), which makes them ideal for multiplexed multi-channel data-acquisition systems, industrial sensor readouts, and embedded control loops where conversion determinism matters more than raw speed. The MAX157 sits at the low-power, low-channel-count end of the SAR ADC family, between discrete 8-bit ADCs and higher-channel-count 12-/14-bit successors such as the MAX1156/MAX1157. Key specifications include 10-bit resolution, 108 ksps maximum sampling rate, 7.4 µs successive-approximation conversion time, 2.5 µs wake-up time from automatic power-down, single +2.7V to +5.25V analog supply, and an internal 2.048V or external reference option. The 8-pin PDIP package and -40°C to +85°C industrial operating temperature range simplify prototyping on through-hole breadboards and legacy industrial front-end boards. Typical applications include portable data logging, industrial process-control analog front ends, battery-powered sensor monitoring, and embedded microcontroller ADC peripherals. Two single-ended input channels support simultaneous monitoring of two transducers via a software-controlled channel-select bit in the serial command word, reducing MCU GPIO overhead. Compared to microcontrollers with internal ADCs, the MAX157 offers superior noise performance, true 10-bit linearity without missing codes, and galvanic isolation of the analog front end from digital switching noise. When designing with this part, place 0.1 µF bypass capacitors as close as possible to VDD and REF pins, keep analog input traces short and guarded by a ground plane, and use the automatic power-down feature between conversions to achieve sub-100 µA average supply current in low-duty-cycle applications. The +5.25V absolute maximum supply rating allows direct connection to 5V digital logic without level shifters. This page synthesizes distributor pricing from DigiKey and Mouser, drop-in same-package alternatives (including the MAX157BCPA industrial-sibling and MAX158/MAX159 same-family pinouts), and practical design notes not found in the manufacturer datasheet. Distributor stock was last verified against the Octopart index on 2026-10-14.
MAX158ACWI+ - 8-Channel 8-Bit 400ksps ADC | Maxim Integrated
The Maxim Integrated MAX158ACWI+ is a CMOS high-speed 8-bit analog-to-digital converter with eight analog input channels, an integrated 2.5V on-chip reference, and a track/hold amplifier, packaged in a 28-pin wide-body SOIC (SOIC-Wide-28). It performs successive-approximation conversions in 2.5 us per channel and supports throughput rates up to 400 ksps when sequentially sampling all eight inputs. The + suffix indicates lead-free, RoHS-compliant lead finish per Maxim Integrated ordering nomenclature. An ADC (Analog-to-Digital Converter) is a data-acquisition component that converts continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Within the broader hierarchy, the MAX158 sits at successive-approximation register (SAR) ADC -> ADC -> data converter -> data acquisition IC -> signal-chain IC -> integrated circuit. Eight-channel, single-supply, parallel-output ADCs of this class are typically used in embedded systems where multiple sensor or process variables must be digitized with a single mixed-signal device. Key features include eight single-ended analog inputs with channel selection, an internal 2.5V bandgap reference, an on-chip track/hold amplifier, and a parallel digital interface that simplifies connection to 8-bit data buses. The device operates from a single +5V analog supply, draws modest supply current, and accepts 0V to +5V unipolar analog inputs in normal operation. Internal reference and input MUX integration reduce external component count on the BOM. The architecture combines a capacitive-charge redistribution DAC with successive-approximation logic and a dedicated track/hold front-end, enabling 2.5 us conversion times per channel. The eight-input analog multiplexer allows software-configurable channel sequencing, and the 2.5V reference is trimmed for low drift, supporting repeatable measurement accuracy across the commercial 0C to +70C temperature range. Typical applications include multi-loop process control, panel-meter and instrumentation front-ends, automotive sensor aggregation, factory automation data-acquisition cards, portable data loggers, and embedded industrial-control boards where multiple analog signals must be sampled by a single host processor. The wide SO-28 footprint is friendly to hand-soldered prototypes and through-hole-compatible PCB layouts. When designing with this device, ensure the analog input driving source presents low output impedance (an op-amp buffer is typically placed ahead of the MUX) and decouple AVDD and DVDD separately to prevent digital switching noise from corrupting the conversion. Per the manufacturer datasheet, an external reference may be substituted by overdriving the internal reference node when higher stability or lower noise is required.
MAX158AEPI+ - 8-Ch 8-Bit 400ksps ADC w/ Mux & Ref | Maxim
The Maxim Integrated (now Analog Devices) MAX158AEPI+ is a CMOS high-speed, 8-bit analog-to-digital converter with 8 analog input channels, an internal 2.5V bandgap reference, and a track/hold amplifier, delivered in a 28-pin PDIP through-hole package. It converts at up to 400 ksps using a successive-approximation architecture with software-configurable unipolar/bipolar input ranges and single +5V analog and digital supply operation. An 8-bit ADC (analog-to-digital converter) is a data-acquisition component that maps a continuous analog input voltage into one of 256 discrete digital codes; successive-approximation ADCs balance speed, resolution, and cost for general-purpose embedded sensing, instrumentation, and process-control applications. Within the broader data-converter hierarchy, this part sits at IC > ADC > SAR ADC > multi-channel ADC, and it integrates the reference and input mux that an external design would otherwise need to add. Key features include 8 single-ended analog inputs (expandable to 16 pseudo-differential pairs) with on-chip channel gating, an internal 2.5V reference (the MAX158 external-reference variant - the MAX154 ships with an internal reference), a parallel microprocessor interface that maps directly onto most 8-bit bus controllers, and low CMOS power dissipation with a hardware power-down pin that drops quiescent current below the active operating level. The integrated track/hold is rated for full-scale inputs up to the supply rails and tolerates input overdrive beyond the rails without damage. The device operates from a single +5V supply (analog and digital), with the analog supply acceptable from 4.75V to 5.25V and the digital supply on a separate pin allowing independent noise isolation. The conversion architecture uses an on-chip clock, and conversion results appear on the 8-bit parallel data bus with standard CS and RD strobes; the BUSY output signals end-of-conversion to the host controller. Typical applications include multi-channel data-acquisition front ends, industrial process-control I/O modules, panel-meter and instrumentation digitizers, and embedded sensor-scanning boards that need more than four analog channels at moderate conversion rates. The internal reference removes a precision analog component from the BOM, and the 8-channel mux lets a single ADC service a small sensor cluster without external analog switching. When designing in this part, budget 400 ksps as the maximum aggregate conversion rate (each channel shares the same throughput); add 0.1uF ceramic bypass on both VDD pins placed within 5 mm of the IC, and confirm reference decoupling when using the internal reference. The DIP package suits through-hole prototypes, hand-repairable production runs, and legacy system upgrades; for high-density SMD designs the surface-mount MAX158AEWI+ variant in SO-28 should be used instead. This page synthesizes distributor pricing, drop-in compatible alternatives, application notes, and design considerations for engineers who need to qualify or substitute the MAX158AEPI+ quickly. The data is cross-referenced against the manufacturer datasheet and three independent distributor sources to reduce the risk of relying on a single reference.
MAX159ACUA - 10-Bit, 108ksps, 2-Ch Serial ADC µMAX | Maxim
The Maxim MAX159ACUA is a +2.7V low-power, 2-channel, 108ksps, serial 10-bit successive-approximation analog-to-digital converter (ADC) housed in an 8-pin µMAX (UMAX-8) surface-mount package. Operating from a single +2.7V to +5.25V analog supply, the device integrates an on-chip clock, automatic power-down between conversions, fast 2.5µs wake-up, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible digital interface that allows direct connection to most microcontrollers and DSPs. An analog-to-digital converter is a mixed-signal integrated circuit that samples an analog input voltage and converts it into a discrete digital code proportional to the input magnitude. Successive-approximation register (SAR) ADCs like the MAX159ACUA achieve a deliberate balance between speed, accuracy, and power consumption by performing one comparison per clock cycle against an internal binary-weighted capacitor DAC, finishing a 10-bit conversion in 7.4µs. SAR ADCs sit within the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor, and are preferred over flash and sigma-delta converters in cost-sensitive, low-power, multiplexed-channel applications such as sensor front ends. Key features include 108 ksps throughput, ±0.5 LSB INL (max), single +2.7V to +5.25V supply operation, automatic power-down that drops supply current between samples, internal 2.5µs wake-up time, and an on-chip clock that eliminates the need for an external timing component. The MAX159ACUA supports 2 analog input channels, integrates an input track-and-hold, and is specified for the commercial 0°C to +70°C operating temperature range. It is a member of the MAX157/MAX159 family that shares the same pinout and registers, easing firmware reuse and BOM flexibility. Typical applications include portable and battery-powered data acquisition, temperature and pressure sensor digitizing loops, pen/digitizer tablets, patient monitoring front ends, and process-control I/O modules. Because the part automatically powers down between conversions, it is well suited to loop-powered 4-20mA sensors, isolated SPI ADC front ends, and handheld instruments where total system current must be minimized. The 3-wire serial interface is compatible with SPI, QSPI, and MICROWIRE hosts, allowing seamless connection to common microcontrollers. When designing with this device, place the 10µF bypass capacitor as close as possible to the VDD lead and keep analog input traces short and guarded, since the SAR architecture is sensitive to charge-injection transients during acquisition. Note that the MAX159ACUA is no longer in active production per the partstack listing; consider MAX159ACUA+ for current orders or MAX157BCPA in a PDIP-8 footprint for legacy through-hole boards. This page synthesizes distributor pricing, drop-in 8-pin µMAX alternatives, and practical design notes that go beyond the manufacturer datasheet alone.
MAX159BCPA - 10-bit 108ksps 2-Ch Serial ADC | Maxim Integrated
The Maxim Integrated MAX159BCPA is a low-power, 10-bit, 2-channel, 108 ksps analog-to-digital converter (ADC) with a high-speed 3-wire serial interface, offered in an 8-pin PDIP (DIP-8) through-hole package. It operates from a single +2.7V to +5.25V supply, draws only 3.2 mW at VDD = +3.6V at the maximum conversion rate, and integrates an on-chip clock, an internal 2.5 µs track/hold, and automatic power-down between conversions for battery-sensitive applications. An analog-to-digital converter (ADC) is a data-acquisition integrated circuit that converts real-world analog signals - such as temperature, pressure, or sensor outputs - into a digital code that a microcontroller or processor can interpret. Successive-approximation (SAR) ADCs like the MAX159 sample an input through a track/hold, then compare the held voltage against a binary-weighted internal DAC bit-by-bit until a 10-bit result is registered. SAR converters sit at one level of the hierarchy: ADC -> data converter -> signal-chain IC -> mixed-signal semiconductor. The MAX159 family targets low-power, low-channel-count systems where SPI/QSPI/MICROWIRE compatibility simplifies glue logic. Key features include 2 single-ended analog input channels (AIN0, AIN1) multiplexed into the SAR core, an external clock or internal oscillator option, ±1 LSB (max) differential non-linearity (DNL) and ±1 LSB (max) integral non-linearity (INL) over the operating range, and a wake-up time of just 2.5 µs from power-down. The 8-pin PDIP package simplifies breadboard prototyping and field-serviceable designs, making the device popular in industrial control front ends and portable instrumentation. The MAX159 uses a charge-redistribution DAC architecture for the SAR conversion and a quiet reference-input path; the supply-rejection topology lets the part operate directly from a noisy 3.3V or 5V rail without an external LDO for many applications. Two digital inputs (CS, SCLK) and one digital output (DOUT) constitute the serial port compatible with SPI, QSPI, and MICROWIRE masters at up to 2.5 MHz. Typical applications include battery-powered handheld meters, portable data loggers, isolated sensor front ends, thermocouple cold-junction compensation boards, and touch-panel digitizers. Designers also use it as a 2-channel replacement for legacy microcontroller-integrated ADCs when more channels or better DC accuracy are required. When designing with this device, place a 0.1 µF bypass capacitor within 5 mm of the VDD pin and keep the analog input traces short and guarded. The reference voltage (REF) needs to be a low-noise source; use a 10 µF ceramic plus 0.1 µF decoupling pair at REF. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
MAX159BEPA - 10-Bit 108ksps 2-Ch Serial ADC | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX159BEPA is a low-power, 10-bit, 2-channel, 108 ksps successive-approximation analog-to-digital converter (ADC) housed in an 8-pin PDIP package. The part operates from a single +2.7 V to +5.25 V supply and integrates a 7.4 µs SAR core, an on-chip clock, automatic power-down between conversions, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible serial interface. An ADC (analog-to-digital converter) is a semiconductor component that converts a continuous analog voltage into a discrete digital code. Successive-approximation register (SAR) ADCs are a widely used architecture that uses a binary search across an internal DAC to determine each bit of the output code, one bit per clock cycle. They offer an excellent trade-off between speed, resolution, and power for sampling rates up to a few megasamples per second. SAR ADCs sit within the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. The MAX159BEPA belongs to this family, optimized specifically for low-power, low-channel-count applications. Key specifications include 10-bit resolution, 108 ksps sampling rate, 2 analog input channels, 7.4 µs conversion time, 2.5 µs wake-up from power-down, and a low supply current that drops dramatically in power-down mode. The 3-wire serial interface shares DIN, SCLK, and DOUT lines, simplifying the connection to any microcontroller. The MAX159 also includes an external reference input, giving designers flexibility to trade noise performance against dynamic range. Typical applications include portable battery-powered instrumentation, data loggers, sensor front ends (temperature, pressure, strain gauges), loop-powered industrial transmitters, pen tablets and touch-screen controllers, and isolated multi-channel data acquisition modules where a small-footprint, low-power ADC is required. When designing with this part, choose the external reference voltage carefully: the ADC's input range scales directly with VREF, and its noise floor (LSB size = VREF / 1024) sets the smallest detectable signal change. Use a low-impedance reference bypass capacitor and short analog input traces to minimize acquisition-time errors. This page synthesizes distributor pricing, drop-in alternative listings, and practical design guidance not collected in the manufacturer datasheet alone. Pricing reflects tier-1 distributor stock and lead times as of 2026-10-14.