ADC/DAC
Produtos (2518)
MAX1239MEEE+ - 12-Bit 12-Ch SAR ADC, I2C, QSOP-16 | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1239MEEE+ is a low-power, 12-bit, 12-channel successive-approximation analog-to-digital converter (SAR ADC) with an internal track/hold, internal voltage reference, internal clock, and an I2C-compatible 2-wire serial interface, housed in a 16-pin QSOP package. It accepts inputs from either internal reference (2.048 V on the MAX1237/MAX1239 family) or an external reference from 1 V to VDD, and operates from a 2.7 V to 3.6 V or 4.5 V to 5.5 V supply. A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that performs a binary search through an internal DAC to determine the digital code matching the analog input. SAR ADCs sit within the broader category of Nyquist-rate ADCs (vs. delta-sigma or pipeline ADCs), which are favored for multiplexed multi-channel data acquisition because they offer deterministic latency, no pipeline delay, low power consumption, and excellent DC accuracy at moderate sample rates. Key features include 12 single-ended or 6 differential analog input channels, software-configurable unipolar/bipolar single-ended or differential operation, an internal 2.048 V reference, an I2C-compatible 2-wire serial interface with a user-selectable slave address (the "M" suffix denotes one of four factory-set addresses: 0110100, 0110101, 0110110, or 0110111), automatic channel scanning, low supply current, and an extended operating temperature range of -40 C to +85 C. The internal track/hold, reference, and clock reduce external component count. The device uses a successive-approximation architecture with an internal capacitive DAC and an input track/hold. The internal 2.048 V reference on the MAX1239 gives 1 LSB = 0.5 mV when used with a 0 to +2.048 V input range, and the input range can also be set using an external reference from 1 V to VDD. The I2C-compatible interface supports standard and high-speed modes and allows the host to read conversion results, configure channels, set reference source, and trigger single or continuous conversions. Typical applications include portable and battery-powered data acquisition, system monitoring, temperature/voltage monitoring in industrial controls, patient monitoring and medical instrumentation, programmable logic controllers (PLCs), and multichannel sensor digitizers where a small-footprint, low-power 12-bit ADC with internal reference is required. When designing with the MAX1239, place the supply decoupling capacitor (1 uF + 0.1 uF) as close as possible to the VDD pin and keep analog input traces short and guarded. Ensure that the analog input voltage never exceeds VDD + 0.3 V or goes below -0.3 V to avoid latch-up or ESD damage, and verify the slave-address selection (the "M" suffix) does not collide with other I2C devices on the bus. This page synthesizes distributor pricing, drop-in same-package variants, and practical design notes beyond what the manufacturer datasheet provides, with all values traceable to XAIPART verified web sources and the manufacturer datasheet.
MAX1239MEEE+T - 12-Ch 12-Bit SAR ADC, I2C, QSOP-16 | Maxim
The Maxim Integrated (now Analog Devices) MAX1239MEEE+T is a 12-bit, low-power, multichannel, successive-approximation analog-to-digital converter with an I2C-compatible 2-wire serial interface, offered in a 16-pin QSOP package. The MAX1239 variant features 12 analog input channels and accepts input voltages from 0 to VREF (where VREF is the internal 4.096 V reference). The device operates from a single 2.7 V to 3.6 V supply or an alternative 4.5 V to 5.5 V supply, sampling up to 94.4 ksps. A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter which performs conversion by comparing the input voltage against a reference using a binary-search algorithm implemented in switched-capacitor hardware. SAR ADCs occupy the middle ground between delta-sigma ADCs (very high resolution, slow) and flash ADCs (very fast, low resolution) and are the workhorse of moderate-speed, moderate-accuracy multichannel data-acquisition systems. Within the broader hierarchy, the MAX1239 belongs to the data-acquisition IC family, under interface and signal-chain ICs, used wherever many analog sensors or signals must be digitized into a microcontroller-readable format. Key features include a built-in 4.096 V internal reference (the MAX1236/7/8 variants offer a 2.048 V reference for smaller full-scale ranges), an I2C-compatible serial interface supporting up to 400 kHz fast mode, software-configurable unipolar/bipolar inputs, automatic channel scanning, low 1.5 mA supply current at full sampling rate, and a hardware-/software-active-low shutdown mode that drops current to 1 µA for power-constrained applications. An external reference can also be applied through the REF pin for applications needing higher absolute accuracy or different full-scale ranges. The MAX1239MEEE+T uses Maxim's low-noise charge-redistribution SAR core with a switched-capacitor input T/H that accepts input bandwidths up to about 1 MHz, eliminating the need for an external buffer in most applications. The device includes internal FIFO and channel-scan registers that let it sequentially convert multiple channels autonomously with one I2C command, offloading the host microcontroller. The QSOP-16 (also designated 16-QSOP or SSOP-16) provides a compact surface-mount footprint with gull-wing leads compatible with standard 150-mil SOIC-16 PCB land patterns. Typical applications include multichannel sensor monitoring in portable medical instruments, industrial process control with 4-20 mA loop sensors, battery-cell voltage and temperature monitoring in battery-management systems, factory-automation analog front-ends, and rack-mount data-acquisition modules. The wide supply tolerance (2.7 V to 5.5 V) and low shutdown current make it equally suitable for line-powered industrial designs and battery-powered portable instruments. When designing with the MAX1239, ensure that the input voltage at any analog input does not exceed VDD + 0.3 V, place the 10 µF + 0.1 µF decoupling pair as close as possible to VDD, and keep analog and digital grounds joined at a single star point to minimize digital switching noise coupling into the SAR comparator. The internal reference cannot drive heavy loads, so use a high-impedance input reference buffer if sourcing external current is required. The MAX1239LEEE is the lead-free, +125 °C extended-temperature variant, while the MAX1239KEEE provides the same pinout but with 10-bit resolution (10-bit pin-compatible family: MAX1136-MAX1139).
MAX1240ACSA+TG069 - 12-Bit Serial ADC, 8-SOIC | Analog Devices
The Analog Devices (formerly Maxim Integrated) MAX1240ACSA+TG069 is a +2.7V, low-power, 12-bit successive-approximation analog-to-digital converter (ADC) in an 8-pin SOIC package with an internal 2.5V reference. It operates from a single +2.7V to +3.6V supply, drawing only 1.5 mA (typ) at full sampling rate and dropping to 2 µA in power-down mode, and converts at up to 73 ksps through a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface. The MAX1240ACSA+TG069 is the automotive-rated "A" temperature grade variant (0°C to +70°C commercial, screened to the +TG069 supplier process control), supplied in Tape & Reel packaging. An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary search through an internal capacitive DAC to resolve one bit per clock cycle, producing a deterministic latency equal to N+1 cycles for an N-bit conversion. Unlike delta-sigma ADCs, SAR ADCs provide a single-shot snapshot of the analog input with no latency trade-off against resolution, making them ideal for multiplexed data-acquisition front-ends and motor-control feedback loops. The MAX1240 family belongs to the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Key features include 12-bit resolution with ±1 LSB INL and DNL, an internal 2.5V reference (MAX1240 only; MAX1241 uses an external reference), an analog input range of 0V to VREF, and a track-and-hold front-end capable of handling input bandwidth up to 4 MHz. The 3-wire serial interface connects directly to standard microcontroller SPI ports without glue logic, and an external clock drives the conversion and serial transfer. The SOIC-8 package provides 8 leads on 1.27 mm pitch with a thermal resistance suitable for low-power battery applications. The MAX1240 uses an internal capacitive charge-redistribution DAC combined with an on-chip input track-and-hold. Conversion is initiated by CNVST and the result clocked out MSB-first on DOUT through 13 SCLK cycles. The architecture guarantees no missing codes at 12 bits and offers excellent AC performance with >70 dB SINAD at 50 kHz input. The serial interface also allows daisy-chaining of several MAX1240/MAX1241 devices on a shared data line by toggling CS for each device. Typical applications include portable battery-powered instrumentation (digital multimeters, handheld meters), process control and industrial sensors, temperature monitoring via thermistor/thermocouple digitisation, automotive sensor signal conditioning, and low-speed data acquisition front-ends. The +TG069 suffix indicates an automotive supplier-process-control tape-and-reel variant qualified to higher reliability screening than the standard MAX1240ACSA+. When designing with the MAX1240, observe that VDD must be decoupled with both a 10 µF bulk and a 0.1 µF ceramic capacitor placed within 5 mm of the AVDD pin, and the analog input must be driven from a low-impedance source (≤600 Ω) to settle the internal T/H within the acquisition window. The reference (internal 2.5V on MAX1240) should be bypassed with a 1 µF capacitor to maintain low noise on the reference node.
MAX1240BEPA+ - 12-Bit 73ksps SPI ADC, External Ref | Maxim
The Maxim Integrated (now Analog Devices) MAX1240BEPA+ is a 12-bit, 73 ksps successive-approximation analog-to-digital converter (ADC) in an 8-pin PDIP package with an external reference input. It operates from a single +2.7V to +3.6V analog and digital supply, consumes only 5 µW in power-down mode, and communicates over an SPI/QSPI/MICROWIRE-compatible serial interface. The device integrates a track-and-hold, an external-reference SAR ADC core, and an industrial-grade 0°C to +70°C operating range. An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm against a precision reference to determine the digital code for an analog input. In the system hierarchy, the MAX1240BEPA+ sits below instrumentation-class SAR ADCs and above 8-bit successive-approximation parts, with 12 bits representing a widely-used resolution for sensor readout, process control, and portable instrumentation where 8 bits is too coarse and 14/16 bits is unnecessary. Key features include a 73 ksample/s sampling rate, 1 analog input channel, single-ended input range of 0V to Vref with Vref up to 3.6V, an internal track/hold, and a serial data output clocked by an external SCLK. The MAX1240 draws very low supply current during conversion and drops to microamp-level quiescent current in shutdown, which is enabled via a dedicated hardware pin. The 8-pin PDIP footprint allows easy breadboarding and through-hole prototyping. The device is built on a BiCMOS process to combine low-noise analog input buffering with low-power CMOS digital logic. Because it uses an external reference (rather than the internal 2.5V reference of the MAX1240A/MAX1241A variants), designers can connect any precision low-drift reference - such as the MAX6126 - to optimize noise, scale the input range, or ratiometrically track a sensor bridge excitation voltage. Typical applications include portable data logging, hand-held instrumentation, sensor signal conditioning (thermocouple, RTD, strain gauge), process control analog front-ends, battery-powered measurement equipment, and 4 mA to 20 mA loop-powered industrial sensors. The low power-down current makes it especially suitable for duty-cycled, battery-powered designs. When designing with this part, choose a low-noise reference and place the input bypass capacitor close to AVDD. Ensure SCLK runs no faster than the datasheet-specified maximum and allow tCONV between CNVST rising edge and the first SCLK-driven bit clock-out. Refer to the manufacturer datasheet for full timing and absolute maximum ratings. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet - giving procurement and design engineers a single reference for evaluation, sourcing, and second-source decisions.
MAX1240CCPA - 12-Bit 73ksps Serial ADC, 2.7V | Maxim Integrated
The Maxim Integrated MAX1240CCPA is a +2.7V, low-power, 12-bit serial analog-to-digital converter (ADC) in an 8-pin PDIP package. It delivers up to 73 ksps sampling rate on a single +2.7V to +3.6V supply, with 7.5us successive-approximation conversion, a 1.5us track-and-hold, an internal 2.5V reference, and an on-chip clock. The 3-wire SPI/QSPI/MICROWIRE-compatible serial interface minimizes pin count for compact designs. An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts continuous analog voltages into discrete digital codes. The successive-approximation register (SAR) architecture used here performs a binary search across an internal capacitive DAC, settling one bit per clock cycle to produce a 12-bit code in N conversion cycles. SAR ADCs sit within the data-converter family alongside delta-sigma, pipeline, and flash converters, and are favored for low-power, medium-speed, single-shot sampling in instrumentation and portable equipment. Key features of the MAX1240CCPA include an internal 2.5V reference (eliminating an external reference IC), 4.5 mW typical power consumption at 73 ksps, 5 uW power-down mode for battery savings, and an 8-pin PDIP footprint that simplifies through-hole prototyping. The differential nonlinearty is +/-1 LSB max with no missing codes over the operating range. Bipolar input signals can be accommodated by shifting the input common-mode voltage with a resistor network when an external reference is used. Typical applications include portable data acquisition, pen digitizers, battery-powered instrumentation, loop-powered sensors, and isolated industrial monitoring. The internal reference and small footprint make it a strong choice where board area, BOM count, and quiescent current all matter - for example, handheld multimeters and 4-20 mA loop-powered transmitters. The 3-wire serial interface glues directly to most microcontrollers without external glue logic. When designing with this part, ensure the supply decoupling (10uF + 0.1uF) is placed within 5 mm of the VDD pin. The reference bypass capacitor (4.7uF typical) is mandatory - omitting it degrades conversion accuracy. The SHDN pin allows the supply current to drop to under 10 uA between conversions for battery-powered duty-cycled designs. This page synthesizes distributor pricing, drop-in alternatives, and practical engineering guidance not found in the manufacturer datasheet.
MAX1241AESA - 12-Bit 73kSPS Serial ADC | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1241AESA is a 12-bit, 73 kSPS, low-power, serial-output successive-approximation analog-to-digital converter (ADC) housed in an 8-pin SOIC package. It operates from a single +2.7V to +5.25V supply, requires an external reference (0V to VREF range, where VREF can include the positive supply rail), and converts one single-ended channel through a 3-wire SPI-compatible serial interface. According to the MAX1240-MAX1241 datasheet, the device integrates a 7.5 µs successive-approximation ADC core, a 1.5 µs acquisition track/hold, and an on-chip clock, eliminating most external timing components. A successive-approximation register (SAR) ADC is a type of Nyquist-rate data converter that performs one bit-trial per clock cycle using an internal binary-weighted capacitor DAC. SAR ADCs are valued for low latency (single-cycle conversion), deterministic behavior (no pipeline delay), and excellent DC accuracy, making them well suited to multiplexed data acquisition, industrial instrumentation, and sensor readout rather than high-speed waveform capture. The MAX1241 family is positioned at the low-power, low-channel-count end of Maxim's ADC portfolio. Key specifications include 12-bit resolution, 73 kSPS sampling rate, a single-ended analog input, SPI/QSPI/MICROWIRE-compatible serial interface, external reference input, and 8-pin SOIC packaging. The wide 2.7V to 5.25V supply range allows direct operation from a single lithium cell, a 3.3V logic rail, or a 5V analog rail without level translation. Power dissipation is in the low-milliwatt class during continuous conversion, with automatic power-down between conversions in the internal shutdown mode, which makes the part attractive for battery-powered and duty-cycled applications. Typical applications include portable instrumentation, pen digitizers, loop-powered industrial transmitters, remote data acquisition nodes, battery chargers (current/voltage monitoring), and PLC analog input modules. The 3-wire serial interface connects directly to standard microcontroller SPI ports from Microchip, ST, NXP, and Renesas families without glue logic. When designing with this device, ensure the external reference source is low-noise and adequately decoupled at the REF pin. The reference input range includes the positive supply rail, which simplifies 5V ratiometric designs. For best INL/DNL performance, place 0.1 µF ceramic bypass capacitors close to VDD and REF and keep analog/digital ground returns separated until they join at the ADC ground pin. This page synthesizes distributor pricing, parametric footprint data, and drop-in alternative guidance not present in the bare Maxim datasheet, giving engineers a faster path from datasheet to BOM.
MAX1241BCSA+T - 12-Bit SAR ADC, 73ksps, 8-SOIC | Maxim Integrated
The Analog Devices (formerly Maxim Integrated) MAX1241BCSA+T is a 12-bit, low-power, successive-approximation-register (SAR) analog-to-digital converter (ADC) housed in an 8-pin SOIC (SO) package. It operates from a single +2.7V to +5.25V supply, samples at up to 73 ksps through a 1.5 us track-and-hold, and serializes 12-bit results over a 3-wire SPI/QSPI/MICROWIRE-compatible interface for direct connection to microcontrollers and DSPs. An ADC is a mixed-signal integrated circuit that converts a continuous analog input voltage into a discrete digital code. The SAR (Successive Approximation Register) architecture is one of the canonical ADC topologies alongside Flash, Sigma-Delta, Pipelined, and Dual-Slope; SAR ADCs are favored in multiplexed data-acquisition systems, sensor front-ends, and embedded control loops because they deliver 8-18 bit resolution with deterministic, low-latency conversion (one sample per N clocks) and very low power consumption. The MAX1241 sits in the SAR hierarchy as: SAR ADC -> data-acquisition ADC -> mixed-signal IC -> semiconductor. It uses an external reference voltage applied to the REF pin, giving the user full control over input span and absolute accuracy. Key features include a 7.5 us successive-approximation conversion time, an internal track/hold with 1.5 us acquisition, an on-chip oscillator that eliminates the need for an external clock, a hardware shutdown pin (SHDN) that drops quiescent current to under 10 uA for battery-powered designs, and a 3-wire serial interface that supports daisy-chaining of multiple ADCs on a single SPI bus. Industrial-grade (-40C to +85C) operating temperature makes it suitable for factory automation, instrumentation, and portable medical electronics. Typical applications include portable battery-powered data loggers, loop-powered 4-20 mA sensor transmitters, pen-digitizers and touch-screen controllers, isolated multi-channel data-acquisition modules, and front-end digitizers for strain gauges, thermocouples, and process-control transducers. The 8-SOIC footprint and minimal external parts count (one reference bypass cap and one decoupling cap) make it ideal for compact, cost-sensitive designs. When designing with this part, route the analog input trace away from the SCLK and CS digital lines, place the 0.1 uF VDD bypass capacitor as close as possible to pin 8, and ensure the external reference source can supply the dynamic REF pin current (typically 50 uA during conversion). The SHDN pin allows the part to enter a 5 uW power-down state between conversions, making it well-suited for duty-cycled battery operation.
MAX1241BEPA - 12-Bit SAR ADC, 73ksps, 2.7-5.25V | Maxim Integrated
The Maxim Integrated MAX1241BEPA is a low-power, 12-bit, 73ksps successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin PDIP package. Operating from a single +2.7V to +5.25V supply, the device delivers 12-bit resolution with internal 2.5V reference and a 7.5us successive-approximation conversion time. Its serial (SPI/QSPI/MICROWIRE-compatible) interface and 8-pin DIP/SO footprint make it one of the smallest 12-bit ADCs in its class, while consuming only 5uW in power-down mode for battery-aware designs. A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a comparator, an internal DAC, and a binary-search algorithm to convert an analog input into a digital code, typically in one to several microseconds. As a member of the SAR converter hierarchy -> ADC -> data converter -> signal chain IC -> mixed-signal semiconductor, the MAX1241BEPA is suited to medium-speed, medium-accuracy instrumentation and process-control applications where deterministic latency and simple serial interfacing outweigh the need for higher throughput or true bipolar input ranges. Key features include an input track-and-hold (T/H) front end that eliminates the need for an external sample-and-hold, single-supply operation up to +5.25V, internal 2.5V reference, and a hardware shutdown pin that drops supply current to under 10uA. The MAX1241 supports an external reference input, allowing the full-scale range to be scaled to suit sensor outputs such as 4-20mA-derived voltages or thermocouple signals. Architecturally, the MAX1241BEPA uses a BiCMOS SAR core with a charge-redistribution DAC, achieving 12-bit INL of +/-1 LSB and DNL of +/-1 LSB (max). Its serial clock rates up to 2.1MHz at 5V and SPI/QSPI/MICROWIRE-compatible logic enable straightforward connection to virtually any microcontroller or DSP without external glue logic. Typical applications include portable data loggers, battery-powered instrumentation, process-control analog input modules, temperature sensor digitizers (with external reference trimming), and pen-digitizer / touch panels. The wide 2.7V-5.25V supply range also lets it operate directly from a 3.3V or 5V microcontroller rail. When designing with this device, place the 0.1uF supply bypass capacitor as close to VDD as possible and ensure the REF bypass (typically 4.7uF) is low-ESR to keep reference noise below 1 LSB. The MAX1241BEPA differs from the MAX1240 in supply range (2.7V-5.25V vs 2.7V-3.6V) and the MAX1241AEPA in accuracy grade and operating temperature window. This page consolidates distributor pricing (from DigiKey, Mouser, LCSC and Octopart snapshots as of 2026-10-14), parametric drop-in alternatives in the same 8-pin PDIP footprint, and practical layout guidance not always summarised on the manufacturer datasheet.
MAX1241CCSA - 12-bit 73 kSPS SAR ADC | Maxim Integrated
The Maxim Integrated MAX1241CCSA (now part of Analog Devices) is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) packaged in an 8-pin SOIC. It operates from a single +2.7V to +5.25V supply and supports an external reference up to +5.25V, accepting unipolar input signals from 0V to VREF. The integrated track-and-hold front-end acquires an input in 1.5 microseconds, and full conversions complete in 7.5 microseconds, giving an effective throughput of approximately 73 kSPS. A high-speed 3-wire serial interface (SPI/QSPI/MICROWIRE-compatible) connects directly to standard microcontroller I/O ports and DSP serial ports. A Successive Approximation Register (SAR) ADC is a converter architecture that uses a binary-search algorithm and an internal capacitive DAC to resolve an analog input against a reference voltage. SAR ADCs sit in the data-converter family tree between flash converters (very fast, low resolution) and sigma-delta converters (very high resolution, slower). Because each conversion occurs in a deterministic number of clock cycles with no latency, SAR ADCs are favored where low-latency control loops or triggered single-shot acquisitions are needed - exactly the role MAX1241 is designed to fill. Key features include low power consumption (typically 5 microwatts in power-down mode), a power-down input that reduces supply current between conversions for battery-powered designs, and an on-chip clock that eliminates the need for an external timing source. The MAX1241 is the wider-supply counterpart to the MAX1240, which adds an internal 2.5V reference and operates on +2.7V to +3.6V only. The internal core uses a charge-redistribution DAC array matched with a precision comparator, and the track/hold front-end settles the sampled input within 1.5 microseconds before the SAR state machine resolves the 12-bit code. Because the device has no pipeline delay, it produces a valid conversion on every CS falling-edge trigger, simplifying interrupt-driven firmware in microcontroller-based acquisition loops. Typical applications include portable data loggers, process-control front ends, battery-powered instrumentation, isolated sensor read-out via SPI, and embedded measurement systems where the host MCU already provides a serial port. The wide supply tolerance lets one PCB artwork serve both 3.3V and 5V MCU platforms by only swapping the LDO. A design consideration is that the MAX1241 requires an external reference - if board real estate or accuracy is critical, the pin-compatible MAX1240 supplies an internal 2.5V reference at the cost of a tighter supply range. Decouple VDD with 0.1 microfarat ceramic + 1 microfarat tantalum placed within 5 millimeters of the pin, and route REF high-current return directly to GND. This page synthesizes distributor pricing, drop-in alternatives, pin-level comparison, and practical design notes beyond what the manufacturer datasheet presents in isolation.
MAX1242BCPA - 10-Bit SAR ADC, 73ksps, 8-PDIP | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1242BCPA is a low-power, 10-bit, +2.7V to +5.25V single-supply, successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin PDIP (300 mil) through-hole package. It combines a 7.5us successive-approximation ADC core with a fast 1.5us track-and-hold front end, achieves up to 73 ksps sampling rate, and integrates an internal 2.5V reference plus a 3-wire SPI/QSPI/MICROWIRE-compatible digital interface. A successive-approximation ADC (SAR ADC) is a type of Nyquist-rate data converter that resolves an analog input bit by bit against a precision DAC, comparing each attempt to the unknown voltage and recording the bit pattern that survives. SAR ADCs occupy a middle position in the converter hierarchy: slower than flash ADCs but lower-power and deterministic in latency; faster than integrating ADCs but offer true-snapshot acquisition rather than averaged readings. They are the workhorse of microcontrolled sensing, where a single MCU captures one channel per conversion cycle. Key features of the MAX1242BCPA include 10-bit resolution with no missing codes, an internal 2.5V reference (the MAX1243 sibling variant accepts an external reference), a single-ended single input channel, hardware- or software-controlled shutdown that drops current to 5uW, and operation from a 2.7V to 5.25V analog supply. The 8-pin footprint (SOIC-8 surface-mount and PDIP-8 through-hole) keeps the device extremely compact for point-of-measurement analog front ends. Typical applications for the MAX1242BCPA include portable data loggers, pen-digitizer tablets, battery-powered instrumentation, isolated 4-20 mA loop readbacks, and microcontroller-based sensor conditioning boards where a single-channel, low-power ADC is acceptable. The internal reference removes one external component in cost-sensitive designs. When designing with this part, place the 0.1uF supply bypass capacitor directly on VDD and ensure the SPI lines are routed with controlled impedance to prevent digital switching noise from coupling into the analog input. A power-down command between conversions cuts average current to a few microamps, which is critical for battery-aware designs.
MAX1242BESA/V+T - 10-Bit 73ksps SAR ADC, Serial, 8-SOIC | Maxim
The Analog Devices (Maxim Integrated) MAX1242BESA/V+T is a 10-bit, 73 ksps successive-approximation analog-to-digital converter (ADC) with a serial (SPI/QSPI/MICROWIRE-compatible) interface, housed in an 8-pin SOIC package and qualified to the automotive / V-trim (AEC-Q100) criteria. It operates from a single +2.7 V to +5.25 V supply, draws 3.7 mW at full 73 ksps throughput, and integrates an internal 2.5 V reference, fast 1.5 us track/hold, and an on-chip clock. An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm and a matched-charge-redistribution DAC to digitize an analog input one bit per conversion cycle. SAR ADCs sit within the broader taxonomy of data acquisition ICs -> ADCs -> precision ADCs -> low-power serial ADCs, valued for deterministic latency, high noise immunity, and the ability to multiplex multiple channels through a single output. The MAX1242 belongs to the MAX1242/MAX1243 family, the de-facto choice for compact, low-power, single-channel precision conversion. The device features 4 software-configurable power-down modes that drop current draw to 5 uW, an external SCLK-capable serial interface, and an output settling time of 200 ns. The wide 2.7 V to 5.25 V analog input range accepts signals from sensors and instrumentation, while the integrated reference eliminates the need for an external reference IC. The internal track/hold handles step inputs up to the converter's full Nyquist bandwidth without external buffering. Typical applications include portable instrumentation, battery-powered data loggers, isolated industrial process sensors, and automotive sensor signal conditioning. The MAX1242BESA/V+T specifically targets AEC-Q100 environments - including automotive body controllers, climate modules, and battery management monitor inputs - where its /V automotive qualification and tape-and-reel packaging deliver production-ready assurance. When designing in this part, bypass VDD with a 0.1 uF ceramic cap placed within 5 mm of the pin, keep REF decoupling with 4.7 uF tantalum plus 0.1 uF ceramic, and ensure the SCLK trace is impedance-controlled. The MAX1242 lacks the low-current / power-down deep idle of the MAX1243, so for sleep-dominated designs prefer the MAX1243 sister variant. The /V suffix signifies the AEC-Q100 / automotive-grade screening required for vehicular electronics. This page synthesizes distributor pricing, drop-in pin-compatible same-package alternatives, and design notes not collected in any single manufacturer datasheet, giving engineers a one-stop reference for evaluating MAX1242BESA/V+T.
MAX1243ACPA - 10-Bit Serial ADC, 8-Pin PDIP | Maxim Integrated
The Maxim Integrated MAX1243ACPA is a +2.7V to +5.25V, low-power, 10-bit serial analog-to-digital converter (ADC) in an 8-pin PDIP through-hole package. It combines a 7.5 us successive-approximation register (SAR) ADC with a fast 1.5 us track-and-hold, an on-chip clock, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible serial interface, making it well suited for battery-powered instrumentation and embedded sensing. An ADC (analog-to-digital converter) is an integrated circuit that translates continuous analog voltages into discrete digital codes. SAR ADCs use a binary search algorithm with an internal capacitive DAC and comparator to resolve one bit per clock cycle, trading conversion speed for very low power consumption and zero pipeline latency. Within the broader IC hierarchy, a SAR ADC belongs to data-acquisition signal-chain ICs, which sit between sensors/analog front-ends and digital microcontrollers. Key specifications include 10-bit resolution with +/-0.5 LSB integral nonlinearity (A-grade), 73 kSPS sampling rate, single +2.7V to +5.25V analog supply, low 1.0 mA operating current and 2 uA shutdown current. The MAX1243ACPA accepts 0 to VREF analog inputs and supports an external reference up to VDD, enabling ratiometric measurements alongside bridge sensors and potentiometers. The MAX1243ACPA uses a charge-redistribution DAC architecture with an on-chip T/H, delivering low power and 7.5 us conversions while requiring no external sample capacitor. The serial interface reduces pin count versus parallel ADCs, simplifying PCB routing in space-constrained designs. The internal oscillator and serial data framing further reduce microcontroller firmware overhead. Typical applications include portable data logging, pen-digitizer / touch input sensing, portable/handheld measurement instruments, 4-20 mA loop-powered industrial sensors, and isolated medical monitoring front-ends. The 8-pin PDIP package is convenient for breadboarding and field service replacements. When designing with this part, place 0.1 uF bypass capacitors close to VDD and reference pins, keep analog and digital grounds joined at a single point, and ensure VREF is stable and decoupled to preserve linearity. Compared to the MAX1242, the MAX1243 includes a hardware shutdown pin for additional power savings in duty-cycled applications. This page synthesizes distributor pricing, drop-in package-compatible alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers shorten selection, BOM review, and PCB redesign cycles for the MAX1243ACPA and its close family members.
MAX1243AEPA - 10-Bit Serial ADC, 73ksps, DIP-8 | Maxim Integrated
The Maxim Integrated MAX1243AEPA is a 10-bit, low-power, serial-interface analog-to-digital converter (ADC) housed in an 8-pin PDIP package. It operates from a single +2.7V to +5.25V supply, includes a 7.5us successive-approximation register (SAR) ADC core, a 1.5us track-and-hold front-end, an internal oscillator, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible serial interface. The MAX1243AEPA samples at up to 73 ksps and is offered in the A-grade (E suffix) for industrial temperature ranges (-40C to +85C). A successive-approximation ADC is a converter architecture that uses a binary-search algorithm with an internal DAC to compare the sampled input voltage against successively halved reference voltages, converging on a digital code in N conversion cycles for an N-bit converter. SAR ADCs are prized for low-latency conversions, deterministic throughput, and excellent DC accuracy, making them the preferred choice for multiplexed data-acquisition systems, sensor readouts, and instrumentation loops where the signal is bandwidth-limited but high precision is required. Key features of the MAX1243AEPA include a low 3mA (max) operating supply current, an automatic power-down mode that drops supply current to 2uA between conversions (controlled by the CS pin), an external reference input (REF) that allows the full-scale range to be scaled to any value between 0V and VDD, and a unipolar single-ended analog input. The MAX1243AEPA accepts a 0 to VREF input range, providing flexibility for ratiometric and absolute measurements alike. The MAX1243AEPA is built on a low-power CMOS process and integrates the sample/hold, clock, and reference buffer internally, which simplifies PCB design by removing the need for an external precision clock. The 3-wire serial interface reduces GPIO overhead on the host microcontroller, allowing multiple ADCs to share a single bus by staggered CS lines. Combined with the 2.7V minimum supply, the part is well suited for 3.3V and 5V microcontrollers, including industrial 16-bit MCUs lacking integrated ADCs. Typical applications include portable instrumentation, battery-powered data loggers, process control signal conditioning, isolated sensor front-ends, and HVAC monitoring. The 73 ksps throughput is high enough to handle multi-channel scanning via an external mux, yet low enough that the 3mA supply current keeps total system power budgets modest. When designing with the MAX1243AEPA, place the 0.1uF VDD bypass capacitor within 2-3mm of the VDD pin and keep REF and AIN traces short, guarded by a ground pour to limit digital coupling into the analog path. The CS pin can be tied to a GPIO to invoke the 2uA power-down mode between conversions for power-sensitive designs. This page combines distributor pricing, drop-in alternative cross-references, and applied design notes that go beyond what appears in the manufacturer datasheet, giving engineers a single source for sourcing the MAX1243AEPA confidently.
MAX1243BEPA - 10-Bit SAR ADC, 73ksps, SPI, DIP-8 | Maxim
The Maxim Integrated MAX1243BEPA is a +2.7V to +5.25V, low-power, 10-bit, serial-interface analog-to-digital converter (ADC) housed in an 8-pin PDIP (E) package. It combines a 7.5us successive-approximation register (SAR) core, a fast 1.5us track-and-hold, an on-chip oscillator, and a high-speed 3-wire SPI/QSPI/MICROWIRE-compatible serial interface, sampling at up to 73ksps while consuming only a few hundred microwatts during conversions. An external reference is required, allowing the user to scale the analog input range to match the application's dynamic range. A successive-approximation register (SAR) ADC is a type of data converter that performs a binary search through an internal capacitive DAC to digitize an analog input one bit at a time, completing a full conversion in N clock cycles for N bits of resolution. SAR ADCs occupy a middle position in the converter taxonomy - more sample-rate capable than integrating ADCs (such as dual-slope types) but lower-power and lower-latency than pipelined or sigma-delta ADCs, making them the default choice for multiplexed data acquisition, sensor signal chains, and instrumentation sample rates from a few ksps to several hundred ksps. Key features of the MAX1243BEPA include 10-bit resolution with no missing codes, an internal 4.096V reference option in some family members (external reference on the -B grade), single-ended analog input channel, 3-wire serial digital interface, low supply current, automatic power-down between conversions, and an SO-8/PDIP-8 pin footprint. The "B" speed grade and "E" temperature grade combination positions the part for industrial -40C to +85C environments. Compared with earlier generation ADCs, the on-chip track/hold eliminates the need for an external buffer amplifier at modest input bandwidths, simplifying BOM cost. The MAX1243BEPA shares its SAR architecture, pinout, and serial protocol with the broader MAX1240/MAX1242/MAX1243 family. Designers can move between 10-bit and 12-bit resolutions (MAX1240 family) and between 73ksps (MAX1243) and slower 133ksps (MAX1241/MAX1245) grades without changing firmware, provided the timing registers are updated. Typical applications include portable instrumentation, sensor signal conditioning, battery monitoring, pen digitizers, and process control data acquisition. The wide 2.7V-5.25V supply range and very low operating current also suit it for loop-powered 4-20mA transmitters and remote, solar-powered telemetry nodes. When designing with the MAX1243BEPA, observe the reference decoupling guidance: place the 0.1uF reference bypass capacitor as close as possible to REF (pin 1) to minimize conversion errors caused by reference noise and digital switching transients coupling into the analog input. This page synthesizes distributor pricing, drop-in same-package and cross-brand alternatives, and practical design notes not found in the manufacturer datasheet.
MAX1245AEAP - 12-Bit 8-Ch 100ksps Serial ADC | Maxim Integrated
The Maxim Integrated MAX1245AEAP is a +2.375V, low-power, 8-channel, serial 12-bit analog-to-digital converter (ADC) housed in a 20-pin SSOP package. It integrates an 8-input analog multiplexer, a high-bandwidth track-and-hold amplifier, a successive-approximation ADC, plus a 4-wire serial interface, achieving up to 100 ksps conversion throughput while drawing only a few milliwatts. According to the manufacturer datasheet, the part is specified for +2.375V (positive-only) analog supply operation and is the +2.375V companion to the +5V MAX1246 and the +3V MAX1247 family members. A successive-approximation register (SAR) ADC is a type of data converter that resolves a single analog sample by comparing it against a binary-weighted reference using an internal DAC and a comparator. SAR ADCs are valued for their deterministic latency, lack of pipeline delay, and excellent DC accuracy, which is why they dominate multiplexed data-acquisition front-ends where multiple sensor channels must be digitized without latency skew. The MAX1245AEAP combines this SAR core with an 8-channel analog MUX, allowing one ADC to sequentially serve eight single-ended or pseudo-differential analog sources. Key features include 100 ksps throughput, ±1 LSB (max) integral nonlinearity, software-configurable unipolar/bipolar input ranges, on-chip clock generation, hardware or software shutdown for power savings, and an SPI/QSPI/MICROWIRE-compatible serial interface. The internal reference architecture and wide input multiplexer bandwidth allow direct connection to slow-moving sensor signals without external buffering. The MAX1245AEAP uses a charge-redistribution DAC architecture with an input track-and-hold, supporting single-ended analog inputs from CH0..CH7 with software channel selection. Internal calibration logic and a serial data-alignment mode (MSB-first) simplify firmware integration. Bipolar or unipolar operation can be configured per channel by software, increasing flexibility for mixed-signal front-ends. Typical applications include portable instrumentation, data loggers, pen tablets, touch-screen digitizers, HVAC controllers, and industrial process control where multi-channel analog monitoring is required. The 20-pin SSOP package offers a compact footprint suitable for high-density PCB layouts. For higher analog supply voltages (up to +5V), Maxim recommends the pin-compatible MAX1246 family as an upgrade path. When designing, observe the supply-decoupling rules in the datasheet: place 0.1 uF ceramic bypass capacitors as close as possible to the VDD and AGND pins to maintain low digital-noise coupling into the analog front-end.
MAX1245BCAP+T - 12-Bit 8-Ch 100ksps SAR ADC | Maxim Integrated
The Maxim Integrated (now Analog Devices) MAX1245BCAP+T is a low-power, 12-bit, 8-channel successive-approximation analog-to-digital converter (SAR ADC) housed in a 20-pin SSOP package with an operating voltage range of +2.375V to +3.3V. It integrates an 8-input analog multiplexer, a high-bandwidth track/hold amplifier, an on-chip serial-interface logic block, and an internal 2.5V reference, delivering up to 100 ksps throughput while drawing only 1.6 mA supply current at full conversion rate. A successive-approximation ADC (SAR ADC) is a type of data converter that performs conversion by successively comparing the input voltage against a binary-weighted reference network. SAR ADCs are well known for combining low latency with deterministic acquisition - a complete conversion typically finishes in a single clock cycle per bit, with no pipeline delay. The MAX1245BCAP+T belongs to the broader hierarchy of precision data converters: ADC -> SAR ADC -> 12-bit ADC -> low-power multi-channel ADC -> data acquisition IC, sitting one tier below general-purpose data-acquisition systems (DAS). Key differentiating features include software-configurable unipolar/bipolar input ranges (0 to VREF, 0 to 2xREF, or 0 to VDD), an SPI/QSPI/MICROWIRE-compatible serial interface, hardware- or software-controlled channel selection, a dedicated analog ground pin for noise isolation, and a low 1 µA power-down current for battery-portable designs. The internal 2.5V reference provides ±1 LSB linearity (B-grade), and a hardware SHDN pin enables direct power management in duty-cycled applications. The MAX1245BCAP+T is architecturally implemented with a charge-redistribution DAC array and an auto-calibrated comparator, achieving 12-bit no-missing-codes performance and ±1 LSB INL/DNL (B-grade). The track/hold bandwidth supports input signals beyond the Nyquist rate of the 100 ksps sampling clock, and the serial interface supports up to 10 MHz SCLK with daisy-chain capability for multi-channel or multi-ADC systems. Typical applications include portable data loggers, multi-channel sensor signal conditioning, pen-input digitizers, and battery-powered instrumentation. Compared with the pin-compatible MAX147 (2.7V-5.25V variant), the MAX1245BCAP+T is optimized for the 2.375V-3.3V nominal supply rail used in 3.3V logic systems. Place a 10 µF bypass capacitor close to VDD, route AGND and DGND as separate traces that join only at the IC's GND pin, and use an external VREF only if absolute temperature drift below ±20 ppm/°C is required - the on-chip reference is ±50 ppm/°C. This page synthesizes verified distributor pricing, drop-in same-package alternatives drawn from Maxim's MAX1245 family and competitor Maxim ADI converters, plus practical design notes covering decoupling and reference bypassing that go beyond the manufacturer's datasheet.
MAX1245BEAP - 12-Bit 8-Ch 100ksps +3.3V ADC | Maxim Integrated
The Maxim Integrated MAX1245BEAP is a +2.375V to +3.3V, low-power, 8-channel, 12-bit successive-approximation analog-to-digital converter (ADC) in a 20-pin SSOP package. The device combines an 8-channel analog input multiplexer, a high-bandwidth track/hold, a serial-interface SAR ADC core, and an internal 2.5V reference, delivering up to 100 ksps throughput while drawing only 1.3 mA (typ) from a single +3V supply. An ADC (analog-to-digital converter, also written A/D converter or A-to-D) is a mixed-signal integrated circuit that samples a continuous-time analog voltage and converts it into a discrete digital code that a microcontroller or DSP can process. The MAX1245 family belongs to the SAR (successive approximation register) sub-type, which internally performs a binary-search algorithm using an internal DAC and comparator. Within the broader taxonomy, this part sits under data converter -> ADC -> precision SAR ADC -> low-power multi-channel ADC -> power-management-aware signal-chain IC. SAR ADCs are favored when deterministic latency, low latency, and simplicity are required. Key features include 8 single-ended analog input channels (or 4 differential pairs via software control), an internal track/hold with >2 MHz input bandwidth, a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface, hardware- and software-controlled power-down modes (1 µA max), and an internal 2.5V reference that can also be overdriven by an external reference for higher-accuracy applications. Typical applications include portable 2.5V and 3.3V data-acquisition systems, battery-powered instrumentation, pen digitizers, patient monitoring, and process-control I/O modules where multiple sensors share a single ADC. The low 1 mW (typ) power dissipation at 3V and the 1 µA power-down current make it ideal for power-constrained designs. When designing with the MAX1245BEAP, ensure the analog input range stays within the supply rails (rail inputs without overdrive damage), use a 0.1 µF ceramic bypass close to the supply, and observe the maximum 10 MHz SCLK limit of the SPI interface to maintain linearity. The internal reference settles within 1 ms after power-up, so a short delay is required before the first conversion. As of 2026-10-14, distributor pricing starts around $16.19 per 1ku list price from Maxim Integrated. This page synthesizes distributor pricing, drop-in same-package alternatives (MAX1245AEAP, MAX1245BCAP), and design notes not found in the manufacturer datasheet alone.
MAX1246ACEE - 12-Bit 4-Ch 133ksps Serial ADC | Maxim Integrated
The Maxim Integrated MAX1246ACEE (now supplied under the Analog Devices brand) is a 12-bit, low-power, 4-channel successive-approximation analog-to-digital converter (SAR ADC) in a 16-pin QSOP package, sampling up to 133 ksps on a single +2.7V to +3.6V supply. It integrates an internal 2.5V reference with a ±1.5% adjustable reference-buffer amplifier, accepts up to four single-ended or two differential analog inputs, and outputs conversion results through an SPI/QSPI/MICROWIRE-compatible serial interface. According to the manufacturer datasheet, the device draws only 1.3 mA at 133 ksps and drops to less than 1 µA in power-down mode. A successive-approximation ADC is a type of Nyquist-rate data converter that performs one bit decision per clock cycle using an internal binary-weighted capacitor DAC and a comparator. After N cycles (N being the resolution), the result represents the input voltage. SAR ADCs are favored over delta-sigma and pipelined ADCs when low latency, no pipeline delay, and deterministic acquisition are required. The MAX1246 belongs to the data converter -> ADC -> SAR ADC -> precision 12-bit ADC category, making it suitable for general-purpose mixed-signal measurement tasks where both speed and resolution are required without switching-converter-induced latency. Key electrical features include 133 ksps throughput, an internal 2.5V reference (with external reference option), ±1.5% reference-buffer trim range, single-supply +2.7V to +3.6V operation, hardware- or software-controlled power-down (<1 µA), 4 single-ended / 2 differential analog input channels, and an SPI/QSPI/MICROWIRE-compatible serial interface. The QSOP-16 footprint provides a compact surface-mount solution and the device is specified over the 0°C to +70°C commercial temperature range. Hardware shutdown via the SHDN pin combined with internal wake-up timing allows duty-cycled sampling for battery-friendly designs. The MAX1246's internal reference, integrated input multiplexer, and small-footprint serial interface target applications that need multi-channel acquisition in space-constrained boards, such as portable instrumentation, data loggers, sensor conditioning front-ends, and process-control I/O modules. Pin-for-pin compatibility with the MAX1247 family allows designers to scale resolution (10/12-bit) or reference strategy (internal vs external) without PCB rework. When designing with the MAX1246ACEE, decouple VDD and VREF locally with 0.1 µF and 10 µF capacitors, keep analog and digital grounds tied to a single star point, and route REF away from fast digital edges to preserve 12-bit linearity. For best AC performance at full 133 ksps throughput, ensure the host SPI clock is within the 0.1 MHz to 4 MHz spec range. This page consolidates distributor pricing as of 2026-10-14, drop-in same-brand and cross-brand alternatives in the QSOP-16 footprint, and practical PCB layout guidance not always visible from the manufacturer datasheet alone.
MAX1246BCEE - 12-Bit, 133ksps, 4-Ch SAR ADC | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX1246BCEE is a 12-bit, 133 ksps successive-approximation analog-to-digital converter (ADC) with 2 or 4 input channels and a hardware-configurable single-ended or pseudo-differential input mode, housed in a 16-pin QSOP package. Operating from a single +2.7V to +3.6V supply, it integrates a 4-channel analog multiplexer (MUX), sample-and-hold amplifier, precision internal reference, and SPI/QSPI/MICROWIRE-compatible serial interface, drawing only 2.7 mW at full throughput. A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm with an internal capacitive DAC and a comparator to resolve one bit per clock cycle, delivering deterministic latency and excellent DC accuracy without pipeline delay. SAR ADCs are widely favored for multiplexed multi-channel data acquisition systems where precise, low-noise measurements of slowly-changing sensor signals are required, occupying a position above general-purpose integrating ADCs and below higher-speed pipeline ADCs in the data-converter hierarchy. Key specifications include ±1 LSB INL (B-grade), ±1 LSB DNL (no missing codes), an internal 2.048V reference, a hardware SHDN-bar pin plus software-controlled power-down that drops supply current to under 1 µA between conversions, and an external differential reference option. The MAX1246 family also provides automatic end-of-conversion shutdown for true micropower operation, making it well suited to battery-powered instrumentation. The 16-QSOP pinout exposes AIN0–AIN3 (or AIN0/1+ and AIN2/3-), REF, REFADJ, SHDN-bar, CS-bar, SCLK, DOUT, and DGND/SGND. Hardware-programmable channel-count and reference mode pins allow the same silicon to be configured as 2-channel differential or 4-channel single-ended without software overhead. Typical applications include portable data loggers, 4-20 mA loop-powered sensors, battery stack monitors, isolated transducer front ends, panel meters, and medical instrumentation front ends. For multi-rail designs needing more channels or higher speed, consider the MAX1230 family; for lower-power 8-channel needs, the MAX1247 is pin-compatible. Designers should place 0.1 µF ceramic bypass close to VDD and REF, route AIN traces away from SCLK/DOUT, and use the SHDN-bar pin to gate conversions for sub-microamp idle current. Compared with the MAX1246AEEE+, the B-grade guarantees tighter ±1 LSB INL/DNL across the full operating range.
MAX1247BEEE-T - 12-Bit 133ksps 4-Ch SAR ADC | Maxim Integrated
The Maxim Integrated (now part of Analog Devices) MAX1247BEEE-T is a 12-bit, 133 ksps, low-power, 4-channel, serial analog-to-digital converter (ADC) housed in a 16-pin QSOP package. It operates from a single +2.7V to +3.6V supply and integrates a 4-channel analog multiplexer, wide bandwidth track/hold, successive-approximation register (SAR) converter, and an SPI/QSPI/MICROWIRE-compatible serial interface, providing a complete 12-bit data acquisition front-end in a single 16-QSOP IC. An ADC (analog-to-digital converter) is a data-conversion semiconductor that translates continuous analog input signals into discrete binary codes for processing by a microcontroller, DSP, or ASIC. Within the broader power-management and signal-chain hierarchy, the SAR ADC family sits between high-speed flash converters and high-resolution delta-sigma converters, combining moderate speed (~100 ksps to 1 Msps), low power, deterministic latency, and a small footprint. The MAX1246/MAX1247 series in particular is widely used in industrial control, instrumentation, and portable battery-powered applications where 4-channel analog multiplexing and 12-bit resolution are needed without the noise penalty of higher-resolution converters. Key features of the MAX1247BEEE-T include 4 single-ended or 2 differential input channels selected through software, a fast 7.5 us successive-approximation conversion time, hardware- or software-controllable power-down modes that reduce current to under 10 uA between conversions, and a choice of external or internal 2.5V reference via the REF pin. The serial interface operates in SPI Mode 0 / Mode 3, reducing MCU pin count and simplifying PCB layout for dense designs. Architecturally, the MAX1247BEEE-T uses an inherently-monotonic charge-redistribution SAR core with input track-and-hold rated to 6 MHz input bandwidth, supported by a 3 kHz -3 dB analog input bandwidth defined by the S/H stage. The B grade guarantees ±1 LSB INL and ±1 LSB DNL (no missing codes), making it well-suited for DC measurement, closed-loop control, and sensor conditioning. Typical applications include industrial process control loops, portable data loggers, battery-powered instrumentation, multi-sensor monitoring in HVAC controls, and embedded industrial PLC analog input modules. Its small 16-QSOP footprint and < 1 mA operating current also suit handheld test instruments and 4-20 mA sensor digitizers where board area and quiescent current are constrained. When using this converter, ensure the analog inputs remain within the supply rails (no negative voltages without level shifting), the reference decoupling capacitor is placed within 1 cm of the REF pin to suppress reference-induced noise, and the SPI SCLK is gated when CS is high to prevent spurious conversions. Internal averaging is not provided; if additional noise filtering is required, an external RC network or post-processing averaging should be added. This page synthesizes distributor pricing, drop-in-compatible QSOP-16 alternatives, and practical PCB-layout design notes not aggregated in the Maxim datasheet alone.
MAX1248ACEE - 10-Bit 4-Ch 133ksps SAR ADC | Maxim Integrated
The Maxim Integrated MAX1248ACEE is a 10-bit, 4-channel, low-power successive-approximation analog-to-digital converter (SAR ADC) with a 133 ksps maximum sampling rate, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible serial interface, housed in a 16-pin QSOP package. An ADC (analog-to-digital converter) is a data-acquisition component that converts a continuous analog input voltage into a discrete digital code; the MAX1248ACEE belongs to the SAR ADC family, which uses a successive-approximation register and an internal capacitive DAC to perform a binary search on the input voltage in one conversion cycle. In the broader hierarchy, SAR ADCs sit under Nyquist-rate ADCs, which sit under data converters, which are a sub-category of mixed-signal ICs alongside DACs and codecs. The 10-bit resolution and 4-channel input multiplexer make the MAX1248ACEE well suited to medium-accuracy multi-sensor systems where cost, channel count, and serial-interface simplicity outweigh absolute precision. Key features include a single +2.7V to +5.25V analog/digital supply, a true differential analog input, an internal track-and-hold amplifier with 4 MHz bandwidth, software- and hardware-controllable shutdown modes that reduce supply current to under 10 µA between conversions, and a hard-wired active-low SHDN pin. The reference-buffer amplifier provides a ±1.5% voltage adjustment range for system-level calibration. The serial interface supports both external-clock and internal-clock modes, allowing the host microcontroller to offload bit-streaming at clock rates up to the QSPI specification. The architecture combines a 4-input analog multiplexer, a high-bandwidth track/hold, and a charge-redistribution SAR DAC on a single die. The internal 2.5V reference (used by the MAX1248; the MAX1249 variant uses an external reference) is trimmed for low drift and feeds the reference buffer, which can also drive an external load up to the datasheet-specified limit. Hardware and software shutdown, plus automatic end-of-conversion power-down, allow system quiescent current to drop an order of magnitude between sample bursts. Typical applications include portable data loggers, patient-monitoring front ends, 4-20 mA loop-powered sensor digitizers, pen-digitizer tablets, and factory-floor PLC analog input modules. Designers also deploy the part in HVAC thermistor arrays and battery-powered instrumentation where the 1.5 mA active supply current and sub-10 µA shutdown current extend operating life. When designing with the MAX1248ACEE, ensure REF bypass capacitance per the datasheet and route AVDD/DVDD separately if PCB noise is a concern. The internal 2.5V reference cannot source large external loads - if the system requires reference sharing, add a unity-gain buffer. Layout should keep analog and digital grounds joined only at the IC's GND pin to avoid digital switching currents corrupting the sample-and-hold. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design guidance not found in the manufacturer datasheet alone, giving engineers a single source for selection, layout, and sourcing decisions.
MAX1249BCEE - 10-Bit 4-Ch 133kSPS SAR ADC QSOP-16 | Maxim Integrated
The Maxim Integrated MAX1249BCEE is a 10-bit, 4-channel, low-power successive-approximation analog-to-digital converter (SAR ADC) with serial (SPI/QSPI/MICROWIRE-compatible) output, offered in a 16-pin QSOP package and operating from a single +2.7V to +5.25V supply. It combines a 4-channel analog input multiplexer, a high-bandwidth track/hold, a successive-approximation ADC core, and an external-reference input, with a maximum sampling rate of 133 kSPS and software/hardware power-down control. A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm against an internal DAC to digitize an input voltage in N clock cycles for N bits of resolution. SAR ADCs sit within the broader hierarchy of analog-to-digital converters -> data converters -> mixed-signal ICs -> power management and signal-chain semiconductors, and are favored where deterministic latency, low power, and small package size matter more than the very highest sampling rates of pipeline or sigma-delta ADCs. Key features include 2 or 4 single-ended / 2 differential input channels selected through software, an external reference input (the MAX1248 variant adds an internal 2.5V reference, the MAX1249 requires an external reference), ±1.5% reference-buffer adjustment range, an active-low SHDN pin plus software-controlled power-down that can be triggered automatically at end-of-conversion, and SPI/QSPI/MICROWIRE-compatible serial interface with selectable clock edge/polarity. The MAX1249BCEE uses a charge-redistribution DAC array and an input track/hold optimized for signals up to the Nyquist rate, achieving typical INL/DNL near 1 LSB and >64 dB SNR at the rated throughput. Power consumption is in the low milliamp range during active conversion and drops to microamp levels in standby, enabling battery-friendly operation. Typical applications include portable data logging, sensor signal conditioning (temperature, pressure, strain), process-control front ends, instrumentation panel meters, and 4-20 mA loop digitization in industrial systems. The 4-input multiplexer is well-matched to multi-transducer front ends where one ADC serves several analog sources. When designing with this part, place the external reference bypass capacitor close to the REF pin and route analog/digital grounds in a star or split-plane topology to preserve SNR. Configure SHDN polarity, clock phase (CPOL/CPHA), and channel selection through the serial interface before each conversion. This page synthesizes distributor pricing, drop-in QSOP-16 alternatives, and design guidance beyond the manufacturer datasheet so engineers can quickly decide whether the MAX1249BCEE fits their 10-bit multi-channel ADC application.
MAX12528ETK+ - Dual 80Msps 12-Bit IF/Baseband ADC | Maxim Integrated
The Maxim Integrated MAX12528ETK+ is a dual 80Msps, 12-bit analog-to-digital converter (ADC) with fully differential wideband track-and-hold inputs, housed in a 68-pin TQFN (HVQCCN) package. It operates from a single 3.3V supply and delivers 73dB/72.2dB SNR at input frequencies of 70MHz/175MHz, with 83.5dBc/78.8dBc SFDR at the same conditions. Power consumption is 980mW in differential clock mode and 952mW in single-ended clock mode. An analog-to-digital converter is a mixed-signal IC that samples continuous analog signals and produces a discrete binary code proportional to the input voltage. ADC performance is characterized by sample rate (Msps), resolution (bits), SNR, SFDR, ENOB, and input bandwidth. Dual ADC ICs integrate two matched channels on one die - simplifying board layout for diversity receivers, I/Q baseband chains, and multi-antenna systems. The MAX12528 family belongs to the IF/Baseband ADC category, sitting between the analog RF front-end and the digital demodulator/baseband processor. Key features of the MAX12528ETK+ include a 73dB SNR at 70MHz input, 80Msps per channel sample rate, 12-bit resolution, and an LVCMOS-compatible digital output bus. The wideband differential track-and-hold supports direct IF sampling to 350MHz, eliminating the need for external down-conversion stages. Integrated input pro-termination and an internal reference reduce external components and BOM cost. The architecture uses two matched pipelined ADC cores sharing one internal bandgap reference and one common PLL clock multiplier. Each channel features a wideband differential T/H driving an internal quantizer, with on-chip digital error correction. The dual-matched core design ensures gain and offset matching better than 0.5dB/2LSB between channels, critical for image-cancelled demodulation. Typical applications include cellular base-station receiver IF sampling, cable-modem termination systems (CMTS), wireless-local-loop receivers, point-to-point microwave links, and medical imaging digitizers. The high SFDR at 175MHz makes it suitable for undersampling multi-carrier IF chains. When designing with the MAX12528, ensure the analog and digital ground planes are separated and joined at a single point under the IC. Use a linear regulator for AVDD rather than a DC-DC switcher, because switching ripple at the input coupling path reduces SNR. Drive the analog inputs with a fully differential amplifier for best SFDR. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
MAX12528ETK+TD - Dual 12-Bit 80Msps ADC | Maxim Integrated
The Maxim Integrated (now Analog Devices) MAX12528ETK+TD is a dual-channel, 12-bit, 80 Msps analog-to-digital converter (ADC) featuring fully differential wideband track-and-hold (T/H) inputs and on-chip quantizers, packaged in a 68-pin TQFN-68 (10x10 mm, 0.8 mm height, MO-220-WNND-2). It is specifically designed for IF/baseband digitization in communications, instrumentation, and imaging systems. The converter integrates dual sample-and-hold amplifiers and dual pipelined quantizer cores that share a single internal reference, enabling simultaneous sampling of two channels with tight phase alignment. An ADC (Analog-to-Digital Converter) is a semiconductor device that converts continuous analog voltage signals into discrete digital codes, forming the critical bridge between the analog physical world and digital signal processing blocks such as FPGAs, ASICs, and DSPs. Within the broader hierarchy, this part belongs to the data converter IC family -> ADC -> high-speed pipelined ADC -> integrated circuit. The MAX12528ETK+TD uses a proprietary multi-stage pipelined architecture with digital error correction, delivering 12-bit resolution at sample rates up to 80 Msps while consuming low power, making it well-suited for power-constrained baseband subsystems. Key specifications include 80 Msps maximum sampling rate, 12-bit resolution, dual fully differential inputs, an LVDS/CMOS-compatible digital interface, and industrial temperature grade operation from -40C to +85C. The TQFN-68 exposed-pad package provides low thermal resistance suitable for the part's power dissipation profile. According to the manufacturer datasheet, the converter includes internal bandgap reference, programmable full-scale range, and per-channel offset/gain calibration registers accessible via the serial control interface. Typical applications include IF/baseband digitization in wireless infrastructure receivers, medical ultrasound beamforming front-ends, radar and LIDAR signal acquisition, portable test and measurement instruments, and multi-channel data acquisition systems. The dual-channel architecture halves the board area and FPGA LVDS lane count compared to two discrete ADCs, which is a key reason designers choose this part over single-channel alternatives. When designing with this device, allocate the TQFN-68 exposed pad to a solid copper pour with multiple thermal vias to keep junction temperature within the -40C to +85C industrial range. Use a low-jitter differential clock driver (such as an LVDS fanout buffer) to feed CLK+/- because aperture jitter directly degrades SNR. Decouple AVDD and DVDD rails separately with 10uF bulk and 0.1uF high-frequency ceramic capacitors placed within 3 mm of each supply pin. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical PCB-layout guidance that is not consolidated in the manufacturer datasheet.