Analog Devices Inc./Maxim Integrated MAX11131AUI+T

Overview

MAX11131AUI+T from Maxim Integrated is a 12-bit, 16-channel, 3Msps SAR analog-to-digital converter with internal FIFO, SampleSet programmable channel sequencing, and dual-clock mode (internal/external). It operates from 2.35V–3.6V, consumes 15.2mW at full speed, and supports single-ended, pseudo-differential, and fully differential inputs. It is used in high-speed portable data acquisition systems requiring low power and flexible multichannel sampling.

For engineers reviewing the MAX11131AUI+T datasheet, MAX11131AUI+T pinout, MAX11131AUI+T application, or MAX11131AUI+T equivalent, key selection criteria include guaranteed ±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 space-constrained industrial and medical instrumentation designs.

Technical Context

The MAX11131AUI+T implements a successive approximation register (SAR) architecture with true differential track-and-hold, enabling 1.5MHz full-linear bandwidth and no pipeline delay. 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 - a 256-step programmable sequencer that offloads microcontroller overhead. Input configuration is software-selectable per channel: 16 single-ended, 8 fully differential pairs, or 15 pseudo-differential inputs referenced to REF−/AIN15.

Key Specifications

Pinout & Package

MAX11131AUI+T is housed in a 28-pin TSSOP package (5.0mm × 9.7mm), optimized for automated assembly and thermal performance in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SAR ADC applications.

Compared with ADS8688IPWR and AD7960BCPZ-RL7, the MAX11131AUI+T uniquely balances 12-bit accuracy, 3Msps throughput, multichannel sequencing, and ultra-low power in a TSSOP package - making it optimal for embedded systems needing intelligent sampling without FPGA or high-speed digital infrastructure.

Availability

MAX11131AUI+T is available at Aetrix Electronics and suitable for high-speed data acquisition systems, industrial control systems, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX11131AUI+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 and mixed-signal ICs for industrial, medical, and communications applications, emphasizing integration, low power, and robust performance.

The MAX11129–MAX11132 family targets portable and space-constrained systems requiring high-speed, multichannel digitization with minimal external components and intelligent sampling control - exemplified by the MAX11131AUI+T's SampleSet and FIFO features.

FAQ

What is the maximum sampling rate supported by the MAX11131AUI+T?

The MAX11131AUI+T supports a maximum conversion rate of 3Msps in both internal and external clock modes. At 48MHz SCLK, externally clocked conversion completes in 333ns per sample, enabling real-time capture of fast transient events without pipeline delay or dead time between conversions.

Does the MAX11131AUI+T require an external reference voltage?

Yes, the MAX11131AUI+T requires an external differential reference applied between REF+ and REF− pins. The reference voltage range is 1V to VDD, and the device guarantees performance with external references - no internal reference is provided, ensuring flexibility and accuracy in precision measurement applications.

How does the SampleSet feature work in the MAX11131AUI+T?

The SampleSet feature in the MAX11131AUI+T is a user-programmable 256-step channel sequencer loaded via the serial interface. It enables autonomous, mixed-rate sampling across up to 16 analog inputs without continuous MCU involvement - reducing system noise, communication overhead, and firmware complexity in multichannel data loggers.

What package type is used for the MAX11131AUI+T?

The MAX11131AUI+T uses a 28-pin TSSOP package (5.0mm × 9.7mm body, 0.65mm pitch). This package supports standard surface-mount assembly, provides adequate thermal dissipation for 15.2mW operation, and offers accessible pinout for debug and probing in prototype and production PCBs.

Can the MAX11131AUI+T operate with a 1.8V digital I/O supply?

Yes, the MAX11131AUI+T supports OVDD from 1.5V to 3.6V, allowing direct connection to 1.8V digital systems. Its digital interface (CS, SCLK, DIN, DOUT) meets 1.8V logic thresholds (VIH = 0.75×OVDD, VIL = 0.25×OVDD), eliminating level shifters in mixed-voltage designs while maintaining 48MHz timing integrity.