Circuitos Integrados

MAX1237KEUA+T

MAX1237KEUA+T - 12-Bit 4-Ch SAR ADC, I2C, 8-uMAX | Maxim

The Maxim Integrated (Analog Devices) MAX1237KEUA+T is a 12-bit, low-power, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with 4 analog input channels, an internal 2.048 V reference, internal track/hold, internal clock, and an I2C-compatible 2-wire serial interface, housed in an 8-pin uMAX/uSOP package. The K suffix designates the industrial operating temperature range of -40C to +85C; the E suffix marks the 8-pin uMAX/uSOP; the A suffix denotes the -40C to +85C industrial grade; the +T suffix indicates tape-and-reel packaging. A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation register and an internal DAC to digitize an analog input one bit per clock cycle. SAR ADCs are valued for low-latency conversions, deterministic acquisition time, and excellent DC accuracy. As a low-power multi-channel SAR ADC with an integrated reference, the MAX1237 belongs to the hierarchy: SAR ADC -> data converter -> mixed-signal IC -> semiconductor. Key features include 12-bit resolution, 2 or 4 single-ended / 1 or 2 differential input channels (software configurable), 94.4 ksps maximum sampling rate, 2.7 V to 3.6 V digital supply (compatible with 1.8 V/2.5 V/3.3 V logic) and 4.5 V to 5.5 V analog supply (MAX1236/MAX1237) - note the MAX1238/MAX1239 in this family share the same 8-pin uMAX package but differ in channel count and supply arrangement. The internal 2.048 V reference provides ratiometric or absolute conversion with 1 LSB INL and 1 LSB DNL (typical). The I2C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes. Typical applications include 4-20 mA industrial sensor digitizing, hand-held instrumentation, portable battery-powered data loggers, PLC analog input modules, HVAC sensor boards, and consumer-grade medical devices. The wide supply tolerance lets the part share analog and digital rails on common 5 V/3.3 V industrial backplanes. When designing with this ADC, place a 10 uF decoupling capacitor adjacent to AVDD and a 1 uF capacitor adjacent to DVDD to keep reference and converter noise off the conversion result. The REF pin requires a minimum 1 uF external bypass capacitor for stability; do not omit it.

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MAX1237LEUA+

MAX1237LEUA+ - 12-Bit 4-Ch SAR ADC, I2C, 8-uMAX | Maxim

The Maxim Integrated (now Analog Devices) MAX1237LEUA+ is a 12-bit, low-power, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with an internal track/hold, voltage reference, clock, and an I2C-compatible 2-wire serial interface. It accepts 4 single-ended or 2 differential analog inputs in an 8-pin uMAX/uSOP (TSSOP-8, 3 mm body) package, operates from 2.7 V to 3.6 V (low-voltage mode) or 4.5 V to 5.5 V (5 V mode), and runs up to 94.4 kilosamples per second at full throughput. An ADC is a mixed-signal integrated circuit that converts a continuous analog voltage on its input pin into a discrete digital code that a microcontroller or processor can read. The SAR (Successive Approximation Register) architecture uses an internal binary-search DAC plus comparator to converge one bit per clock cycle, giving a deterministic 12-cycle conversion that is well-suited to multiplexed multi-channel data-acquisition systems where low power and small size matter more than multi-megasample rates. Key features include 4 single-ended / 2 differential input channels with software-configurable unipolar/bipolar operation, an internal 2.048 V or 4.096 V reference (selectable between internal reference and external REF), an I2C-compatible 2-wire serial interface with seven slave addresses, hardware/software shutdown modes that drop supply current below 1 microampere between conversions, and an integrated FIFO/scanner mode for autonomous channel scanning. The -L suffix denotes the industrial -40 C to +85 C operating range. Typical applications for the MAX1237LEUA+ are portable and battery-powered data-acquisition front-ends, 4-20 mA loop-powered sensor transmitters, handheld medical instruments, programmable logic controller (PLC) analog input modules, HVAC environmental sensor hubs, and consumer equipment such as white-goods user-interface boards. When designing with the MAX1237LEUA+, place the 0.1 microfarad bypass capacitor as close as possible to the AVDD pin and the 10 microfarad bulk capacitor at the board input; the analog inputs require a low-impedance source to settle within the acquisition window at 94.4 kSPS. This page synthesizes authorized distributor pricing, drop-in pin-compatible alternatives from the MAX1236/MAX1238/MAX1239 family and across brands, and practical design notes not found in the manufacturer datasheet alone.

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MAX1237LEUA+T

MAX1237LEUA+T - 12-Bit, 4/12-Ch 2-Wire ADC | Maxim Integrated

The Analog Devices (formerly Maxim Integrated) MAX1237LEUA+T is a low-power, 12-bit, multi-channel analog-to-digital converter (ADC) with an I2C-compatible 2-wire serial interface, offered in an 8-pin µMAX package with tape-and-reel packaging. It features 4 or 12 analog input channels, an internal track/hold, voltage reference, and an internal oscillator, and operates from a single 2.7V to 3.6V supply while consuming only 670 µA at the maximum sampling rate of 94.4 ksps. An ADC (Analog-to-Digital Converter) is a data-acquisition component that translates real-world analog signals into discrete digital codes, allowing microcontrollers and processors to read sensor outputs, audio levels, or system voltages. The MAX1237 belongs to the successive-approximation register (SAR) ADC family, which excels at low-latency, multiplexed multi-channel conversions and is widely used in embedded data-acquisition systems. In the broader component hierarchy, this device sits within Data Converters > ADC > SAR ADC > Multi-Channel SAR ADC > Low-Power Serial-Interface ADC, and is one of four variants (MAX1236/MAX1237/MAX1238/MAX1239) covering 3V and 5V supplies and 4 or 12 input channels. Key features include 12-bit resolution with ±1 LSB DNL, 4.5V to 5.5V or 2.7V to 3.6V supply operation (L grade), hardware- and software-configurable unipolar/bipolar input ranges (0 to VREF, 0 to 2×VREF, and ±VREF/±2×VREF), an internal 2.048V or 4.096V reference, and software-programmable input channel selection including an external REF/AIN channel. The 2-wire I2C-compatible interface supports standard, fast, and high-speed modes and allows up to four device addresses on a single bus. The internal SAR architecture combined with input fault protection to ±6V and an integrated FIFO reduces microcontroller overhead, making the device well-suited to low-power, multi-sensor designs. The internal track/hold amplifier accepts fast input slews, while the integrated reference and oscillator minimize external BOM cost. Typical applications include battery-powered portable instrumentation, sensor conditioning for temperature, pressure, or strain gauges, handheld multimeters, data loggers, and factory-floor analog input modules. The 1.2 mA input leakage and 94.4 ksps throughput allow designers to scan multiple low-bandwidth transducer signals from a single ADC. When designing with this part, ensure the input common-mode voltage stays inside the supply rails and add proper decoupling (typically a 10 µF bulk cap near the supply pin plus a 0.1 µF ceramic close to the package). For noisy environments, average multiple conversions in software to take advantage of the device's noise-free resolution. This page synthesizes verified distributor pricing, drop-in same-family replacements, comparison parameters, and practical design notes that are not presented together on the manufacturer datasheet or in any single distributor listing.

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MAX1238EEE/V+

MAX1238EEE/V+ - 12-Bit 12-Ch 94.4ksps SAR ADC | Maxim Integrated

The Maxim Integrated MAX1238EEE/V+ is a low-power, 12-bit, 12-channel successive-approximation analog-to-digital converter (SAR ADC) that operates from a single 4.5V to 5.5V supply and samples at up to 94.4 ksps while drawing only 670 µA. It integrates an input track/hold, 4.096 V internal voltage reference, internal clock, and an I²C-compatible 2-wire serial interface, and is offered in a 16-pin QSOP (EEE) package with an extended industrial temperature grade. A SAR ADC is a converter architecture that uses a binary-weighted capacitor network and a comparator to resolve each input sample in N clock cycles, where N is the resolution in bits. It belongs to the data-acquisition IC family, sitting between precision analog front ends and digital microcontrollers; the taxonomy runs SAR ADC -> ADC -> data converter -> data acquisition IC -> mixed-signal IC. This category matters because SAR ADCs offer deterministic latency, no-pipeline-delay sampling, and very low power, making them the workhorse for multiplexed sensor reading in industrial and instrumentation systems. Key specifications include 12 input channels (configurable as 6 or 12 single-ended or pseudo-differential pairs), ±1 LSB INL and DNL, an internal 4.096 V reference (±1% accuracy per Maxim datasheet), and 2-wire serial compatibility at clock rates up to 400 kHz (Fast-Mode). The 16-QSOP exposed-pad version provides a low thermal-resistance path to PCB copper, allowing the part to dissipate internally generated heat during continuous 94.4 ksps bursts. Internally, the device combines a high-impedance input mux, the SAR logic core, an auto-shutdown mode that drops supply current to 1.5 µA between conversions, and a configurable scan mode that sequentially cycles through selected channels and stores results in the I²C-accessible register map. The /V suffix denotes the automotive-grade operating range (-40 °C to +125 °C), distinguishing it from the commercial MAX1238EEE+. Typical applications include industrial process-control sensor multiplexing, portable data loggers, patient-monitoring front ends, factory-automation PLC analog input modules, and HVAC environmental sensor hubs. The wide analog input range (0 to VREF when internal reference is used, or up to VDD with external reference) supports direct connection to 4-20 mA loop shunts, thermistor dividers, and bridge sensors. When designing with this part, place the 0.1 µF and 10 µF decoupling capacitors within 5 mm of AVDD/DVDD pins, and follow Maxim's QSOP thermal-pad layout to keep junction temperature within the /V grade's 125 °C ceiling under worst-case 5.5 V × 670 µA continuous sampling. This page synthesizes distributor pricing for the /V automotive-grade variant, drop-in cross-reference parts from the same MAX1236-MAX1239 family, and practical design notes not bundled in the manufacturer datasheet.

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MAX1238KEEE+T

MAX1238KEEE+T - 12-Bit, 12-Channel SAR ADC | Maxim Integrated

The Analog Devices / Maxim Integrated MAX1238KEEE+T is a low-power, 12-bit, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with up to 12 analog input channels, internal track/hold, internal voltage reference, internal clock, and an I2C-compatible 2-wire serial interface, housed in a 16-pin QSOP package. Operating from a 2.7V to 3.6V or 4.5V to 5.5V supply, it consumes approximately 670 µA at the maximum conversion rate and drops to 1 µA in shutdown. A SAR ADC (Successive Approximation Register ADC) is a type of analog-to-digital converter that uses a binary search through an internal DAC to resolve an analog input into a digital code, one bit per conversion clock cycle. The SAR ADC family sits within the broader hierarchy of ADCs -> data converters -> mixed-signal ICs -> integrated circuits, and it is widely used when designers need a deterministic acquisition time, low latency, and moderate resolution (typically 8 to 18 bits) at sample rates up to a few MSPS. Key features include 12-bit resolution with no missing codes, software-configurable unipolar/bipolar input ranges, an internal 2.5V reference (4.096V in the MAX1239 variant), single-ended or pseudo-differential channel configurations, and an I2C-compatible serial interface supporting both 400 kHz Fast Mode and 1.7 MHz High-Speed Mode. The 16-pin QSOP package measures approximately 3.9 mm wide, suiting compact PCB layouts where multiple analog sensors must be digitized close to the controller. The architecture combines a capacitive DAC, a high-bandwidth track/hold front end, and an on-chip oscillator, eliminating the need for external precision components. An integrated sequencer can automatically scan all configured channels in one I2C transaction, reducing host firmware overhead in multi-sensor data acquisition loops. Typical applications include battery monitoring in portable medical and industrial equipment, multi-cell battery pack voltage sensing in power tools and e-bikes, front-end digitizing for PLC analog input modules, temperature/pressure transducer arrays in process control, and general-purpose sensor multiplexing in 4 mA to 20 mA loop replacement designs. When designing with this ADC, place the 0.1 µF supply bypass capacitor as close to pin 16 (VDD) and pin 1 (GND) as possible. Because the reference is internal, supply noise above 100 kHz couples directly into the conversion result; a ferrite bead or pi-filter on AVDD/REF is recommended when the part shares a rail with noisy digital or switching loads. This page synthesizes distributor pricing from DigiKey and Mouser, pin-compatible same-family drop-in alternatives, and PCB-level design notes that are not duplicated in the manufacturer datasheet.

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MAX1238LEEE+T

MAX1238LEEE+T - 12-Ch 12-Bit 94.4ksps I2C SAR ADC | Analog Devices

The Analog Devices (formerly Maxim Integrated) MAX1238LEEE+T is a 12-bit, low-power, multi-channel successive-approximation analog-to-digital converter (SAR ADC) with 6 or 12 analog input channels, an internal track/hold, an internal 4.096 V voltage reference, an internal oscillator, and an I2C-compatible 2-wire serial interface. It operates from a single 4.5 V to 5.5 V analog supply, samples at up to 94.4 ksps, and draws only 670 µA at maximum throughput, with supply current falling to 0.5 µA in shutdown. A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of analog-to-digital converter that uses a binary-search feedback loop with an internal DAC to digitize an analog input, producing one conversion per N clock cycles for N bits of resolution. SAR ADCs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They are favored over delta-sigma and pipeline ADCs when low latency, deterministic sample timing, and a small footprint are needed, which is why they dominate multi-channel sensor-acquisition and embedded instrumentation front-ends. Key specifications include 12-bit resolution, ±1 LSB INL/DNL (typ.), an internal 4.096 V reference with 50 ppm/°C tempco, an input range of 0 V to VREF (unipolar) or ±VREF (bipolar software-configurable), a software-configurable unipolar/bipolar mode with 4 single-ended or 12 differential inputs, an I2C-compatible 2-wire serial interface running at up to 400 kHz in standard mode, an integrated temperature sensor with ±2 °C accuracy, and operation over the extended industrial temperature range of -40 °C to +85 °C. The architecture combines an internal charge-redistribution DAC, sample-and-hold, configurable input multiplexer, and internal clock, so external components are limited to bypass capacitors and pull-ups on the I2C bus. Power-down sequencing through software reduces quiescent current to sub-microamp levels between conversions, making it suitable for battery-powered sensor polling. Typical applications include portable data-acquisition loggers, industrial process-control sensor multiplexing, thermocouple and RTD temperature measurement, medical instrumentation front-ends, battery-powered handheld test equipment, and remote HVAC monitoring. The integrated temperature sensor is useful for cold-junction compensation in thermocouple chains. Designers should keep analog and digital grounds joined at a single point near the IC and place 1 µF + 0.1 µF decoupling caps close to AVDD/DVDD to preserve 12-bit noise performance across heavy digital switching. Pricing is current as of 2026-10-14 and reflects typical distributor inventory.

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MAX1239LEEE+

MAX1239LEEE+ - 12-Bit 12-Ch 2-Wire SAR ADC | Maxim Integrated

The Analog Devices (formerly Maxim Integrated) MAX1239LEEE+ is a low-power, 12-bit resolution, 12-channel (6 differential), successive-approximation analog-to-digital converter (SAR ADC) with an internal track/hold, internal voltage reference, internal clock, and an I2C-compatible 2-wire serial interface. It is offered in a 16-pin QSOP package with an operating supply range of 2.7V to 3.6V and a secondary 4.5V to 5.5V tolerance, drawing typically 670 microamps at maximum sampling rate. Sample rate is software-selectable up to 94.4 ksps through the external I2C clock configuration. The integrated 4.096V internal reference eliminates an external reference IC and four external capacitors in most applications, reducing BOM and PCB area. An SAR ADC is a successive-approximation-register analog-to-digital converter that uses an internal binary-search algorithm against a precision reference voltage to convert an analog sample to a 12-bit digital word in a fixed number of clock cycles. SAR ADCs sit inside the broader hierarchy of analog-to-digital converters (which also includes delta-sigma, pipeline, flash, and dual-slope types). They are favored when the application needs deterministic latency, low power, and no architectural input-charge kickback, making them dominant in multiplexed multi-channel data-acquisition systems, sensor-interface modules, and battery-powered instrumentation. Key features include 12 input channels configurable as 6 single-ended or 6 differential pairs, software-configurable unipolar/bipolar operation, an automatic channel-scan mode with internal sequencer, an internal 4.096V reference (or external reference option), software shutdown to 1 microamp typical, an I2C-compatible serial interface supporting standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes, and an operating temperature range of -40 degrees Celsius to +85 degrees Celsius. The integrated sequencer and channel-scan registers let a host microcontroller configure a one-shot or continuous scan that walks the channels and stores results in internal data registers without per-sample CPU intervention. The MAX1239LEEE+ is typically deployed in industrial process control loops, 4-20 mA sensor digitizers, handheld multimeters and test instruments, portable medical monitoring equipment, programmable logic controller (PLC) analog input modules, HVAC environmental sensor concentrators, and consumer battery chargers that need to monitor multiple cell voltages. In each case its combination of 12 channels, internal reference, and low operating current allows a single chip to replace a discrete ADC plus an external reference plus multiple analog multiplexers. For designs that need 14-bit or 16-bit noise-free resolution at the same channel density, the MAX130x family or the LTC2360 series would be the next step up. When designing with this ADC, place 0.1 microfarat ceramic bypass capacitors as close as possible to both AVDD and DVDD pins and keep the analog ground return path short and direct to the system analog ground plane to limit digital coupling. Software configuration must set the reference mode (internal vs external) and the clock-divider bits before initiating a conversion through the I2C setup register. This page synthesizes drop-in cross-reference data, distributor stock, design notes, and pin-compatible alternatives not found on a typical manufacturer product page.

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MAX1239LEEE+T

MAX1239LEEE+T - 12-Bit 12-Channel 2-Wire Serial ADC | Maxim Integrated

The Analog Devices (formerly Maxim Integrated) MAX1239LEEE+T is a 12-bit, 12-channel successive-approximation analog-to-digital converter (SAR ADC) with an I2C-compatible 2-wire serial interface, housed in a 16-pin QSOP package. It operates from a single 2.7V to 3.6V supply, supports up to 94.4 ksps sampling rate, and integrates track/hold, voltage reference, and clock. A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm against an internal DAC to digitize an analog input within N clock cycles (one per bit), achieving N-bit resolution with low latency and deterministic conversion time. SAR ADCs sit within the ADC family (successive-approximation, sigma-delta, pipeline, flash) under the data-converter hierarchy, which itself falls under data acquisition and finally signal-chain/mixed-signal ICs in the broader semiconductor taxonomy. Key features of the MAX1239 include 12 input channels (with 6 channels configurable as differential pairs), an internal 2.5V or 4.096V reference (channel-dependent setting), automatic channel scanning, an on-chip FIFO, and software-configurable unipolar/bipolar inputs. The 2-wire interface supports standard (100 kHz), fast (400 kHz), and high-speed (1.7 MHz) modes, easing isolation across boards. Architecturally, the device combines a capacitive-charge-distribution DAC with an internal track/hold, sample clock, and 4.096V reference. Internal reference trimming minimizes gain error, while factory calibration of the internal oscillator removes the need for an external crystal in most applications. Typical uses include portable data loggers, battery-cell monitoring, panel-meter front-ends, industrial sensor multiplexing, and 4-20mA loop digitizers. The wide channel count is well matched to multi-sensor embedded systems where space and I/O count matter. When designing, allocate sufficient settling time on high-impedance inputs (the part supports 0.3 µA bias, so source impedance must be limited) and follow Maxim's recommended analog input RC network to avoid conversion noise. Decouple AVDD with 10 µF + 0.1 µF ceramic capacitors placed within 5 mm of the supply pins. This page synthesizes distributor pricing, drop-in same-package alternatives (different I2C address variants of MAX1236/MAX1237/MAX1238/MAX1239, plus the same family from Analog Devices) and practical design notes that go beyond a single datasheet table.

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MAX1239MEEE+

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.

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MAX1239MEEE+T

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).

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MAX1240ACSA+TG069

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.

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MAX1240BEPA+

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.

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MAX1240CCPA

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.

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MAX1241AESA

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.

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MAX1241BCSA+T

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.

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MAX1241BEPA

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.

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MAX1241CCSA

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.

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MAX1242BCPA

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.

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MAX1242BESA/V+T

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.

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MAX1243ACPA

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.

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MAX1243AEPA

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.

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MAX1243BEPA

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.

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MAX1245AEAP

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.

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MAX1245BCAP+T

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.

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MAX1243ACPA - 10-Bit Serial ADC, 8-Pin PDIP | Maxim Integrated

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MAX1245BCAP+T - 12-Bit 8-Ch 100ksps SAR ADC | Maxim Integrated