Analog Devices Inc./Maxim Integrated MAX11132ATI+T

Overview

MAX11132ATI+T from Maxim Integrated is a 12-bit, 3Msps, low-power SAR analog-to-digital converter with 8-channel single-ended or 4-channel fully differential input capability, internal FIFO, SampleSet programmable sequencer, and 48MHz SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates from 2.35V–3.6V supply, consumes 15.2mW at full speed, and targets high-speed data acquisition in battery-powered industrial sensors and portable medical instrumentation.

For engineers reviewing the MAX11132ATI+T datasheet, MAX11132ATI+T pinout, MAX11132ATI+T application, or MAX11132ATI+T equivalent, key selection considerations include its 1.5MHz full-linear bandwidth, ±1 LSB INL/DNL over –40°C to +125°C, external differential reference support (1V to VDD), 70dB SINAD at 500kHz, and TQFN-28 (5mm × 5mm) package with exposed thermal pad.

Technical Context

The MAX11132ATI+T implements a successive approximation register (SAR) architecture with dual clock modes: internally clocked (with 16-entry FIFO and configurable averaging) and externally clocked (with SampleSet channel sequencing up to 256 steps). Its analog front-end supports flexible input configurations - single-ended, pseudo-differential (relative to REF−/AIN15), or fully differential - with software-selectable bipolar ranges (±VREF+/2 or ±VREF+).

It features a true differential track-and-hold amplifier, 30ps RMS aperture jitter, and 52ns acquisition time. The 3-wire serial interface operates with CPOL=CPHA=1, CS-active-low framing, and DOUT data valid on SCLK falling edge; output format includes 4-bit channel ID + 12-bit result when CHAN_ID=1, or zero-padded 12-bit result when CHAN_ID=0.

Key Specifications

Pinout & Package

MAX11132ATI+T is housed in a 28-pin, 5mm × 5mm, 0.5mm pitch TQFN package with exposed thermal pad (EP) requiring direct connection to PCB ground plane for thermal and noise performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8684IPWR and AD7928BRUZ, the MAX11132ATI+T delivers 3× higher sampling rate than the latter and 3× faster throughput than the former, while occupying 40% less PCB area and consuming 60% less active power - making it optimal for compact, high-throughput, battery-sensitive applications.

Availability

MAX11132ATI+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, automotive cabin sensing, and wireless IoT node development requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MAX11132ATI+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 MAX11129–MAX11132 family was engineered to deliver high-speed, low-power, multichannel data acquisition in space- and energy-constrained systems - emphasizing integration (FIFO, sequencer), flexibility (input modes, voltage scaling), and robustness (–40°C to +125°C operation).

FAQ

What is the maximum sample rate supported by the MAX11132ATI+T?

The MAX11132ATI+T supports a maximum conversion rate of 3 million samples per second (3Msps) in both internal and external clock modes. At 48MHz SCLK with external clocking, conversion time is 333ns per sample; internal clock mode achieves the same rate with built-in timing control and FIFO buffering. This rate is maintained across the full –40°C to +125°C operating temperature range.

Does the MAX11132ATI+T require an external reference voltage?

Yes, the MAX11132ATI+T requires an external differential reference applied to REF+ and REF− pins, with REF+ ranging from 1V to VDD and REF− from –0.3V to +1V. It does not include an internal reference. Using an external reference ensures high accuracy and flexibility - for example, a 2.5V reference yields 610µV per LSB (2.5V/4096) - and enables ratiometric measurements when paired with resistive sensors.

How many analog input channels does the MAX11132ATI+T support, and how are they configured?

The MAX11132ATI+T supports 8 analog input pins (AIN0–AIN7), configurable as eight single-ended inputs, four fully differential pairs (e.g., AIN0/AIN1), or seven pseudo-differential inputs referenced to REF−/AIN15. Configuration is controlled via internal registers; all channels share software-selectable unipolar (0 to VREF+) or bipolar (±VREF+/2 or ±VREF+) input ranges, enabling mixed-mode acquisition in a single device.

What serial interface protocols is the MAX11132ATI+T compatible with?

The MAX11132ATI+T features a 3-wire SPI-compatible serial interface that operates with CPOL = CPHA = 1 (SCLK idle high, data sampled on falling edge), supporting direct connection to SPI, QSPI, and MICROWIRE controllers without level shifters or glue logic. It uses CS, SCLK, and DOUT/DIN lines - no MISO/MOSI naming - and delivers 16-bit frames containing channel ID and 12-bit result (or zero-padded variant).

What is the purpose of the SampleSet feature in the MAX11132ATI+T?

The SampleSet feature in the MAX11132ATI+T is a user-programmable analog input channel sequencer that allows up to 256 unique conversion sequences to be preloaded into internal memory. Once enabled, the ADC autonomously cycles through the defined channel order without microcontroller intervention - reducing firmware complexity, lowering system-level noise, and freeing the host processor for real-time computation or low-power sleep states.