Analog Devices Inc./Maxim Integrated MAX11128ATI+T

Overview

The MAX11128ATI+T from Analog Devices is a 12-bit, 16-channel, 1Msps SAR analog-to-digital converter with external reference support, 1.5MHz full-linear bandwidth, and 70dB SINAD at 250kHz - designed for high-speed data acquisition in battery-powered industrial and medical instrumentation.

For engineers reviewing the MAX11128ATI+T datasheet, MAX11128ATI+T pinout, MAX11128ATI+T application, or MAX11128ATI+T equivalent, this device requires attention to its SampleSet™ channel sequencing, internal FIFO buffering, ±1 LSB INL/DNL accuracy over temperature, and TQFN-28 (5mm × 5mm) package thermal interface requirements.

Technical Context

The MAX11128ATI+T implements a successive-approximation register (SAR) architecture with dual clock modes: internally clocked (with integrated 16-entry FIFO and averaging) and externally clocked (enabling SampleSet™ programmable channel sequencing). It supports single-ended, pseudo-differential, and fully differential input configurations across all 16 analog inputs.

Its analog front-end includes true differential track-and-hold, bipolar input range selection (±VREF+/2 or ±VREF+), and 15-channel crosstalk rejection of –88dB. Digital interface compliance covers SPI, QSPI™, and MICROWIRE® protocols at up to 16MHz without level-shifting logic.

Key Specifications

Pinout & Package

Package: 28-pin, 5mm × 5mm, exposed-pad TQFN (Package Code T2855+3, Outline 21-0140).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8688IPWR and AD7961BCPZ, the MAX11128ATI+T uniquely balances 12-bit precision, 16-channel flexibility, sub-6mW power, and embedded intelligence (SampleSet™, FIFO, averaging) in a thermally optimized 5mm × 5mm package - making it optimal for space-constrained, battery-aware industrial and portable systems requiring deterministic multichannel sampling.

Availability

MAX11128ATI+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 and long-term production continuity.

Supply support for MAX11128ATI+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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX11128ATI+T belongs to the MAX11120–MAX11128 family of low-power, multichannel SAR ADCs engineered for precision, speed, and energy efficiency in portable and harsh-environment data acquisition.

FAQ

What is the maximum sampling rate supported by the MAX11128ATI+T?

The MAX11128ATI+T supports a maximum sampling rate of 1Msps (1 million samples per second) in both internal and external clock modes. At this rate, conversion time is 1000ns in externally clocked mode (16MHz SCLK) and 5.9µs in internally clocked mode. Full-linear bandwidth remains 1.5MHz, ensuring ≥70dB SINAD up to that frequency - critical for accurate capture of fast transients in industrial sensor networks.

Does the MAX11128ATI+T require an external reference voltage?

Yes, the MAX11128ATI+T requires an external differential reference: REF+ (1V to VDD) and REF− (–0.3V to +1V). It does not include an internal reference. The REF+ pin draws 36.7µA at 1Msps (VREF+ = 2.5V), and must be bypassed with a 0.47µF capacitor to GND. This external reference architecture enables ratiometric measurements with bridge sensors and supports system-level reference sharing across multiple ICs.

How many analog input channels does the MAX11128ATI+T support, and what configurations are available?

The MAX11128ATI+T supports 16 analog input channels (AIN0–AIN13, CNVST/AIN14, REF−/AIN15). All channels can be configured as single-ended, pseudo-differential (relative to REF−/AIN15), or fully differential pairs - enabling up to 8 simultaneous differential measurements. Input ranges are software-selectable: ±VREF+/2 or ±VREF+, and absolute input voltage limits are –0.1V to VREF+ + 0.1V relative to GND.

What is the purpose of the SampleSet™ feature in the MAX11128ATI+T?

SampleSet™ is a user-programmable channel sequencer that stores up to 256 conversion steps in on-chip RAM. It allows non-repeating, variable-rate sampling across any subset of the 16 inputs - for example, scanning 4 high-priority sensors at 100ksps while reading 12 ambient sensors at 1ksps. This offloads sequencing logic from the host MCU, reduces interface traffic, and lowers overall system power and noise - a key advantage in distributed sensor nodes.

What package type and thermal characteristics apply to the MAX11128ATI+T?

The MAX11128ATI+T uses a 28-pin, 5mm × 5mm TQFN package with exposed pad (T2855+3, Outline 21-0140). Its thermal resistance is θJA = 29°C/W and θJC = 2°C/W (JEDEC 4-layer board). The exposed pad (EP) must be soldered directly to the PCB ground plane to achieve specified performance and reliability. This package enables high-density layouts while maintaining junction temperatures below 150°C at 5.4mW dissipation in +70°C ambient.