Analog Devices Inc./Maxim Integrated MAX11132ATI+

Overview

MAX11132ATI+ from Maxim Integrated is a 12-bit, 8-channel, 3Msps 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 15.2mW at 3Msps, and supports single-ended, pseudo-differential, and fully differential input configurations for high-accuracy data acquisition in portable and industrial systems.

For engineers reviewing the MAX11132ATI+ datasheet, MAX11132ATI+ pinout, MAX11132ATI+ application, or MAX11132ATI+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all strictly derived from Maxim's official MAX11129–MAX11132 datasheet (Rev 5, 9/12).

Technical Context

The MAX11132ATI+ implements a SAR architecture with dual clock modes: internal clock mode (enabling 16-entry FIFO buffering and on-chip averaging to improve SNR) and external clock mode (supporting SampleSet™ programmable channel sequencing up to 256 entries). Its analog front-end includes a true differential track-and-hold with configurable input topology across all 8 channels.

It features a 48MHz 3-wire SPI/QSPI/MICROWIRE-compatible serial interface with CPOL=CPHA=1, CS-active-low framing, and DOUT data valid on SCLK falling edge. Input voltage ranges include unipolar (0 to VREF+) and bipolar (±VREF+/2 or ±VREF+) selectable via RANGE register, with absolute input limits of –0.1V to VREF+ + 0.1V relative to GND.

Key Specifications

Pinout & Package

MAX11132ATI+ is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), optimized for thermal performance (θ_JA = 29°C/W) and PCB space efficiency in compact designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX11131ATI+, the MAX11132ATI+ trades channel count for reduced routing complexity in 8-sensor systems; versus ADS8684IPWR, it delivers 3× faster sampling and integrated sequencing at the cost of 4-bit resolution - making it optimal for real-time, resource-constrained embedded DAQ.

Availability

MAX11132ATI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical sensors, and automotive cabin sensing requiring stable component supply, extended temperature operation (–40°C to +125°C), and low-power precision data acquisition.

Supply support for MAX11132ATI+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX11129–MAX11132 family was designed for low-power, high-speed multichannel data acquisition in space- and energy-constrained systems - emphasizing integrated intelligence (SampleSet™, FIFO, AutoShutdown™) to reduce host processor burden.

FAQ

What is the maximum sampling rate supported by MAX11132ATI+?

The MAX11132ATI+ supports a maximum sampling rate of 3Msps in both internal and external clock modes. In external clock mode with fSCLK = 48MHz, conversion time is 333ns per sample (16 SCLK cycles), enabling sustained 3Msps operation. The internal clock mode achieves the same rate with built-in timing control and FIFO buffering.

Does MAX11132ATI+ support differential input configurations?

Yes, MAX11132ATI+ supports fully differential input pairs (4 channels), pseudo-differential inputs referenced to REF−/AIN15 (7 channels), and single-ended inputs (8 channels). Differential mode accepts bipolar ranges of ±VREF+/2 or ±VREF+ depending on RANGE register setting, with guaranteed 70dB SINAD at 500kHz input frequency.

What is the purpose of the EOC pin on MAX11132ATI+?

The EOC (End of Conversion) pin on MAX11132ATI+ is an active-low output that asserts only in internal clock mode to indicate when conversion data is valid and ready to be read from DOUT. In external clock mode, EOC is not used - data validity is determined by SCLK timing and frame structure, as specified in Figures 2a–2c of the datasheet.

Can MAX11132ATI+ operate with a 1.8V digital I/O supply?

Yes, MAX11132ATI+ supports OVDD from 1.5V to 3.6V, including 1.8V. Its digital interface (CS, SCLK, DIN, DOUT) is fully compatible with 1.8V logic levels: VIH = 0.75 × OVDD (≥1.35V) and VIL = 0.25 × OVDD (≤0.45V), eliminating need for level shifters when interfacing with 1.8V microcontrollers or FPGAs.

How does the SampleSet™ feature reduce system-level processing overhead?

SampleSet™ in MAX11132ATI+ allows users to predefine and load a custom channel sequence (up to 256 entries) into on-chip memory. Once enabled, the ADC autonomously cycles through the sequence without host intervention - reducing CPU polling, minimizing interrupt latency, and lowering overall system power consumption during multichannel acquisition.