Analog Devices Inc./Maxim Integrated MAX1238MEEE+

Overview

The MAX1238MEEE+ from Maxim Integrated is a 12-bit, 12-channel analog-to-digital converter (ADC) with I²C-compatible 2-wire serial interface, internal 4.096V reference, and single-supply operation from 4.5V to 5.5V. It delivers 94.4ksps throughput, ±1 LSB INL/DNL accuracy, and ultra-low 670µA supply current at max rate-enabling high-resolution sensing in space-constrained industrial monitoring systems.

For engineers reviewing the MAX1238MEEE+ datasheet, MAX1238MEEE+ pinout, MAX1238MEEE+ application, or MAX1238MEEE+ equivalent, key selection criteria include its 12-channel multiplexed analog input architecture, software-configurable unipolar/bipolar and single-ended/differential modes, internal FIFO with channel-scan capability, and guaranteed operation across –40°C to +85°C.

Technical Context

The MAX1238MEEE+ employs successive-approximation (SAR) conversion with a fully differential track-and-hold circuit and switched-capacitor DAC. Its internal 2.8MHz oscillator enables autonomous conversion timing without external clock dependency in internal-clock mode.

It supports both Fast Mode (400kHz) and High-Speed Mode (1.7MHz) I²C communication, with programmable slave address (0110101) and HS-mode entry via master code 00001XXX. Channel scanning is managed through configuration registers, and analog input range scales from 0 to VREF (unipolar) or ±VREF/2 (bipolar) under software control.

Key Specifications

Pinout & Package

The MAX1238MEEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for automated assembly and thermal performance in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.

Compared with ADS7953IRHBT and AD7923BRUZ, the MAX1238MEEE+ uniquely combines I²C simplicity, integrated 4.096V reference, 12-channel scan automation, and sub-1µA shutdown-making it optimal for compact, low-firmware-overhead industrial and portable designs requiring 12-input precision digitization.

Availability

The MAX1238MEEE+ is available at Aetrix Electronics and suitable for industrial sensor hubs, portable data loggers, medical vital sign monitors, and energy meter front-ends requiring stable component supply and long-term manufacturability.

Supply support for MAX1238MEEE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.

The MAX1236–MAX1239 family was engineered for low-power, multichannel data acquisition in space- and energy-constrained systems-emphasizing integration (reference, T/H, clock, I²C), wide temperature operation, and flexible input configuration.

FAQ

What is the maximum sampling rate supported by the MAX1238MEEE+?

The MAX1238MEEE+ achieves a maximum throughput rate of 94.4ksps when operating in High-Speed Mode (1.7MHz I²C clock) with external clocking. This rate is sustained across all 12 channels in channel-scan mode and supports full 12-bit resolution without missing codes. Internal clock mode reduces throughput to 51ksps but eliminates external clock dependency.

Does the MAX1238MEEE+ require an external reference voltage?

No, the MAX1238MEEE+ features a factory-trimmed 4.096V internal reference with ±2% initial accuracy and 25ppm/°C temperature coefficient. It can operate entirely with this reference, though an external reference from 1V to VDD may be applied at the AIN11/REF pin for custom scaling or improved stability.

How many analog input channels does the MAX1238MEEE+ support, and how are they configured?

The MAX1238MEEE+ supports 12 analog input channels (AIN0–AIN11), configurable in software as either 12 single-ended inputs or 6 fully differential pairs. Configuration is controlled via the SGL/DIF bit in the setup register and channel select bits (CS[3:0]), enabling flexible signal routing without hardware changes.

What package type and pin count does the MAX1238MEEE+ use?

The MAX1238MEEE+ is supplied in a 16-pin QSOP (Quarter-Size Outline Package) with 0.635mm lead pitch and dimensions of 5.3mm × 10.2mm. This RoHS-compliant, surface-mount package supports automated assembly and provides adequate thermal dissipation for continuous 94.4ksps operation.

Is the MAX1238MEEE+ compatible with standard I²C protocols?

Yes, the MAX1238MEEE+ implements a fully compliant 2-wire I²C interface supporting both Standard/Fast Mode (400kHz) and High-Speed Mode (1.7MHz). It uses a fixed 7-bit slave address (0110101) and supports START/STOP, repeated START, ACK/NACK, and HS-mode entry via master code-ensuring interoperability with common microcontrollers and I²C controllers.