Analog Devices Inc./Maxim Integrated MAX1137EUA+T

Overview

MAX1137EUA+T from Maxim Integrated is a low-power, 10-bit, 4-channel analog-to-digital converter with integrated track/hold, 2.048V internal reference, I²C-compatible 2-wire serial interface, and operation from 2.7V to 3.6V supply. It delivers 94.4ksps throughput with 670µA supply current and supports software-configurable unipolar/bipolar and single-ended/differential input modes - deployed in battery-powered medical instruments and portable test equipment.

For engineers reviewing the MAX1137EUA+T datasheet, MAX1137EUA+T pinout, MAX1137EUA+T application, or MAX1137EUA+T equivalent, key selection criteria include its 8-pin µMAX package, ±1 LSB INL/DNL accuracy over –40°C to +85°C, internal FIFO with channel-scan mode, and dual I²C speed support (400kHz Fast Mode / 1.7MHz High-Speed Mode).

Technical Context

The MAX1137EUA+T employs successive-approximation architecture with fully differential track/hold circuitry and a switched-capacitor DAC. Its analog front-end supports four single-ended or two fully differential inputs, with input range selectable via internal 2.048V reference or external 1V–VDD reference.

It uses an internal oscillator or external clock for conversion timing, enters AutoShutdown™ between conversions (reducing current to <1µA), and implements I²C slave addressing (0110100) with HS-mode entry via master code 00001XXX. Acquisition time is 800ns, and full-linear bandwidth reaches 5.0MHz.

Key Specifications

Pinout & Package

MAX1137EUA+T is housed in an 8-pin µMAX® package (2.1mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs. Pin functions are validated per Maxim's official datasheet (Rev 6, 3/10).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit multichannel ADC applications.

Compared with ADS1114IDGSR and MAX11607AUT+T, the MAX1137EUA+T uniquely balances 4-channel flexibility, 94.4ksps throughput, and sub-1µA shutdown current - making it optimal for portable systems requiring both responsiveness and multi-day battery operation.

Availability

MAX1137EUA+T is available at Aetrix Electronics and suitable for medical instrumentation, battery-powered test equipment, and solar-powered remote systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1137EUA+T 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 MAX1136–MAX1139 family was engineered for ultra-low-power, multichannel data acquisition in portable and energy-harvesting systems - emphasizing integration (ref, T/H, clock, I²C), small footprint (µMAX/QSOP), and wide temperature operation.

FAQ

What is the maximum sampling rate of the MAX1137EUA+T and what conditions enable it?

The MAX1137EUA+T achieves a maximum sampling rate of 94.4ksps when operated in I²C High-Speed Mode (1.7MHz SCL) with external clocking and internal reference enabled. This requires the host master to issue the HS-mode entry code (00001XXX), followed by a repeated START and valid slave address (0110100). Internal clock mode limits throughput to 22.2ksps.

Does the MAX1137EUA+T support differential input configurations, and how is it configured?

Yes, the MAX1137EUA+T supports fully differential inputs across two channels (e.g., AIN0–AIN1, AIN2–AIN3) using the SGL/DIF bit in the configuration byte. When SGL/DIF = 0, the device performs differential conversion; BIP/UNI bit then selects ±VREF/2 (bipolar) or 0–VREF (unipolar) range. Differential mode requires proper layout symmetry and matched source impedances to maintain CMRR.

How does the AutoShutdown™ feature reduce power consumption in the MAX1137EUA+T?

AutoShutdown™ automatically powers down the MAX1137EUA+T's analog circuitry, reference, and clock between conversions. At low throughput rates (<1ksps), this reduces supply current to less than 1µA - critical for extending battery life in handheld devices. The feature is inherent to the architecture and requires no software control or register writes to activate.

Can the MAX1137EUA+T use an external reference, and what is the acceptable voltage range?

Yes, the MAX1137EUA+T accepts an external reference voltage applied to the AIN3/REF pin within 1V to VDD (2.7V–3.6V). When using external reference, the internal 2.048V reference is disabled. Performance remains specified (±1 LSB INL/DNL, 60dB SINAD) provided the external reference exhibits ≤25ppm/°C drift and ≤40µA load current capability.

What package type and pin count does the MAX1137EUA+T use, and is it RoHS-compliant?

The MAX1137EUA+T uses an 8-pin µMAX® package (2.1mm × 2.1mm, 0.5mm pitch) with exposed pad for thermal enhancement. The "+T" suffix confirms lead(Pb)-free and RoHS-compliant construction per EU Directive 2011/65/EU, with JEDEC-standard reflow profile compatibility (peak 260°C).