Analog Devices Inc./Maxim Integrated MAX11137ATI+T

Overview

MAX11137ATI+T from Maxim Integrated is a 12-bit, 16-channel, 500ksps successive-approximation register (SAR) analog-to-digital converter with external reference support, 1.5MHz full-linear bandwidth, and integrated FIFO. It operates from 2.35V–3.6V, consumes 4.2mW at 500ksps, and supports single-ended, pseudo-differential, and fully differential input configurations for high-accuracy data acquisition in battery-powered instrumentation.

For engineers reviewing the MAX11137ATI+T datasheet, MAX11137ATI+T pinout, MAX11137ATI+T application, or MAX11137ATI+T equivalent, this page delivers verified electrical specs, real-world timing behavior, channel sequencing capability via SampleSet technology, internal averaging for SNR improvement, and SPI/QSPI/MICROWIRE-compatible 3-wire interface details - all critical for embedded sensor interface and closed-loop control design.

Technical Context

The MAX11137ATI+T implements a SAR architecture with dual clock modes: internally clocked (with 16-entry FIFO and programmable averaging) and externally clocked (enabling SampleSet-based user-defined channel sequencing up to 256 entries). Its analog multiplexer supports true differential track-and-hold across all 16 inputs, configurable per channel as single-ended, pseudo-differential (relative to common AIN15), or fully differential pairs.

It features two software-selectable bipolar input ranges (±VREF+/2 or ±VREF+), 70dB SINAD guaranteed at 250kHz input frequency, and ±1 LSB INL/DNL over –40°C to +125°C. The 8MHz 3-wire serial interface operates with VOVDD = 1.5V–3.6V, enabling direct connection to 1.8V/2.5V/3.3V logic without level shifters.

Key Specifications

Pinout & Package

MAX11137ATI+T is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), optimized for thermal performance and PCB space efficiency in compact industrial and portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8688IPWR and AD7961BCPZ, the MAX11137ATI+T uniquely balances 16-channel count, 12-bit precision, 500ksps throughput, integrated FIFO, and SampleSet sequencing - making it optimal for resource-constrained embedded systems needing deterministic multichannel acquisition without MCU intervention.

Availability

MAX11137ATI+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, and automotive battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX11137ATI+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 automotive applications.

The MAX11135–MAX11143 family was engineered to deliver high-resolution, low-power, multichannel data acquisition in space-constrained environments - emphasizing integrated sequencing, FIFO buffering, and wide supply flexibility for portable and harsh-environment systems.

FAQ

What is the maximum sample rate supported by the MAX11137ATI+T?

The MAX11137ATI+T supports a maximum conversion rate of 500ksps in both internal and external clock modes. In externally clocked mode with fSCLK = 8MHz, conversion time is 2000ns per sample (16 clock cycles), enabling precise timing control for synchronized multichannel acquisition. Internal clock mode achieves the same rate with built-in timing and FIFO buffering.

Does the MAX11137ATI+T require an external reference voltage?

Yes, the MAX11137ATI+T requires an external reference: REF+ accepts 1V to VDD, and REF-/AIN15 serves as the reference negative or 16th analog input. An external reference ensures absolute accuracy across temperature and supply variations - critical for applications like battery voltage monitoring where ±5mV error is unacceptable.

How does the SampleSet feature work on the MAX11137ATI+T?

The SampleSet feature on the MAX11137ATI+T allows users to define and load a custom channel sequence (up to 256 entries) into internal memory. Once loaded, the ADC autonomously scans inputs in that order without MCU intervention - reducing software overhead and system noise in applications such as environmental sensor arrays or predictive maintenance monitors.

What are the power supply requirements for the MAX11137ATI+T?

The MAX11137ATI+T requires two supplies: VDD (2.35V–3.6V) for analog circuitry and OVDD (1.5V–3.6V) for digital I/O. This dual-supply architecture enables direct interfacing with 1.8V, 2.5V, or 3.3V microcontrollers without level shifters. At 3V/500ksps, total power dissipation is 4.2mW; full shutdown draws only 2µA.

Is the MAX11137ATI+T pin-compatible with other devices in the MAX11135–MAX11143 family?

No - the MAX11137ATI+T is a 16-channel variant in a 28-pin TQFN package, while MAX11135 (4-channel) and MAX11136 (8-channel) share the same footprint but route unused pins to GND. Pin compatibility exists only within same-channel-count variants (e.g., MAX11137/MAX11140/MAX11143), not across channel counts. Always verify pin mapping using the official pin configuration diagrams.