Analog Devices Inc./Maxim Integrated MAX11131ATI+T

Overview

MAX11131ATI+T from Maxim Integrated is a 12-bit, 16-channel, 3Msps SAR analog-to-digital converter with internal FIFO, SampleSet channel sequencing, and dual-clock operation (internal/external). It supports single-ended, fully differential, and pseudo-differential inputs, operates from 2.35V–3.6V, consumes 15.2mW at full speed, and targets high-speed portable data acquisition systems.

For engineers reviewing the MAX11131ATI+T datasheet, MAX11131ATI+T pinout, MAX11131ATI+T application, or MAX11131ATI+T equivalent, key selection considerations include its 1.5MHz full-linear bandwidth, ±1 LSB INL/DNL over –40°C to +125°C, 70dB SINAD at 500kHz, 48MHz SPI/QSPI/MICROWIRE-compatible interface, and TSSOP-28 package compatibility with industrial temperature range requirements.

Technical Context

The MAX11131ATI+T implements a successive approximation register (SAR) architecture with true differential track-and-hold, enabling simultaneous sampling of up to 16 analog channels. Its internal clock mode integrates a 16-entry FIFO and supports on-chip averaging to improve SNR for noisy signals.

In external clock mode, it executes user-defined channel sequences via SampleSet technology-configurable up to 256 steps-reducing microcontroller overhead. Input configuration flexibility includes unipolar (0 to VREF+) and bipolar (±VREF+/2 or ±VREF+) ranges, with programmable RANGE bit control and REF+/REF− differential reference support.

Key Specifications

Pinout & Package

MAX11131ATI+T is housed in a 28-pin TSSOP package (5.0mm × 9.7mm), optimized for space-constrained industrial PCB layouts while maintaining thermal performance (θ_JA = 37°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8688IPWR and AD7960BCPZ, the MAX11131ATI+T uniquely balances 12-bit precision, 3Msps throughput, integrated sequencing logic, and sub-16mW power in a TSSOP package-making it optimal for cost-sensitive, space-constrained, battery-aware industrial and medical edge nodes.

Availability

MAX11131ATI+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical sensors, automotive battery management, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX11131ATI+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 industrial, medical, and communications applications.

The MAX11129–MAX11132 family was engineered to deliver high-speed, low-power, multichannel data acquisition in compact packages-specifically addressing portable instrumentation, closed-loop control, and battery-operated sensing systems.

FAQ

What is the maximum sampling rate supported by the MAX11131ATI+T?

The MAX11131ATI+T supports a maximum sampling rate of 3Msps in both internal and external clock modes. At 48MHz SCLK, externally clocked conversion completes in 333ns per sample. Internally clocked conversion takes 2.1µs, enabling sustained 3Msps operation with FIFO buffering to prevent data loss during serial readout delays.

Does the MAX11131ATI+T require an external reference voltage?

The MAX11131ATI+T supports both internal and external reference configurations. While it can operate with VDD as reference (unbuffered), optimal performance-including guaranteed 70dB SINAD and ±1 LSB INL-requires an external differential reference applied to REF+ and REF− pins. The reference range is 1V to VDD, and REF+ draws only 110nA at 3Msps.

How does the SampleSet feature work on the MAX11131ATI+T?

The SampleSet feature on the MAX11131ATI+T is a user-programmable channel sequencer that accepts up to 256 entries defining analog input order, sampling interval, and channel-specific settings. Once loaded, it autonomously cycles through the sequence without host intervention-reducing CPU overhead and enabling deterministic multi-rate sampling in applications like vibration analysis or sensor fusion.

What are the supported input configurations for the MAX11131ATI+T analog channels?

The MAX11131ATI+T supports three input configurations per channel: single-ended (16 channels, 0 to VREF+), fully differential (8 pairs, ±VREF+/2 or ±VREF+), and pseudo-differential (15 channels referenced to REF−/AIN15). Configuration is controlled via internal registers and requires no external components-enabling rapid reconfiguration for diverse sensor types on the same PCB.

Is the MAX11131ATI+T compatible with standard SPI interfaces?

Yes, the MAX11131ATI+T features a 3-wire SPI-compatible serial interface operating with CPOL = CPHA = 1 (SCLK idles high, data sampled on rising edge, output on falling edge). It supports up to 48MHz SCLK, delivers 16-bit frames (4-bit channel ID + 12-bit result), and interoperates directly with microcontrollers, FPGAs, and DSPs without level shifters or glue logic when OVDD matches host I/O voltage.