Analog Devices Inc./Maxim Integrated MAX11121ATI+

Overview

MAX11121ATI+ from Analog Devices is a 10-bit, 1Msps, low-power SAR ADC with external reference support, 1.5MHz full-linear bandwidth, and 16-channel analog multiplexer. It operates from 2.35V–3.6V supply, consumes 5.4mW at 1Msps, and supports single-ended, pseudo-differential, and fully differential input configurations for industrial sensor data acquisition.

For engineers reviewing the MAX11121ATI+ datasheet, MAX11121ATI+ pinout, MAX11121ATI+ application, or MAX11121ATI+ equivalent, key selection criteria include its 10-bit resolution with ±0.4 LSB INL/DNL, SampleSet™ programmable channel sequencing, internal FIFO for burst sampling, and SPI/QSPI/MICROWIRE-compatible 16MHz 3-wire interface in a space-saving 28-pin TQFN package.

Technical Context

The MAX11121ATI+ implements a successive-approximation register (SAR) architecture with dual clock modes: internal clock (enabling FIFO buffering and on-chip averaging) and external clock (enabling SampleSet™ user-defined channel sequencing). Its analog front-end supports flexible input configuration across all 16 channels - including single-ended (16-channel), pseudo-differential (15-channel), and fully differential (8-channel) modes - with two software-selectable bipolar input ranges (±VREF+/2 or ±VREF+).

It features true differential track-and-hold, 7.5MHz -0.1dB full-power bandwidth, and guaranteed 61dB SINAD at 250kHz input frequency. The device integrates AutoShutdown™ and fast wake-up, achieving 2μA full-shutdown current while maintaining operation over –40°C to +125°C.

Key Specifications

Pinout & Package

MAX11121ATI+ is housed in a 28-pin, 5mm × 5mm, exposed-pad TQFN package (package code T2855+3, outline 21-0140). The exposed pad (EP) must be connected directly to GND for optimal thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with ADS8684IPWR and AD7476ARTZ-REEL7, the MAX11121ATI+ uniquely balances 10-bit accuracy, 1Msps throughput, 16-channel flexibility, and intelligent power management - making it optimal for embedded systems requiring adaptive, low-overhead data acquisition.

Availability

MAX11121ATI+ is available at Aetrix Electronics and suitable for industrial sensor hubs, portable medical monitors, automotive climate controllers, and smart energy meter sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11121ATI+ 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 MAX11120–MAX11128 family was designed specifically for low-power, multichannel, high-speed data acquisition in space- and energy-constrained embedded systems - emphasizing configurability, interface simplicity, and guaranteed performance across extended temperature ranges.

FAQ

What is the maximum sampling rate supported by the MAX11121ATI+?

The MAX11121ATI+ supports a maximum sampling rate of 1 million samples per second (1Msps) 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. This enables real-time capture of signals with up to 500kHz bandwidth while maintaining no pipeline delay - critical for closed-loop control and transient event detection.

Does the MAX11121ATI+ require an external reference voltage?

Yes, the MAX11121ATI+ requires an external differential reference: REF+ (1V to VDD + 50mV) and REF− (–0.3V to +1V). It does not include an internal reference. The device draws 36.7µA from REF+ at 1Msps, and the REF+ input must be bypassed with a 0.47µF capacitor to GND. This external reference architecture enables precise system-level calibration and compatibility with isolated or ratiometric sensor bridges.

How many analog input channels does the MAX11121ATI+ support, and how are they configured?

The MAX11121ATI+ supports up to 16 analog input terminals (AIN0–AIN15), configured as 16 single-ended, 8 fully differential pairs, or 15 pseudo-differential inputs relative to REF−/AIN15. Configuration is controlled via internal registers and the RANGE bit. CNVST/AIN14 and REF−/AIN15 serve dual roles - enabling flexible pin reuse without external switches - and all channels share the same 1.5MHz full-linear bandwidth specification.

What is SampleSet™ technology, and how does it benefit system design using the MAX11121ATI+?

SampleSet™ is a user-programmable channel sequencer that allows up to 256 conversion steps to be preloaded into the MAX11121ATI+'s internal memory. Once loaded, the ADC autonomously executes the sequence without host intervention - reducing SPI traffic, freeing MCU resources, and lowering system-level noise. This is especially valuable in battery-powered or real-time deterministic applications where predictable, low-overhead multichannel sampling is essential.

What package type and thermal characteristics apply to the MAX11121ATI+?

The MAX11121ATI+ uses a 28-pin, 5mm × 5mm TQFN package with exposed pad (T2855+3, outline 21-0140). Its thermal resistance is θJA = 29°C/W on a JEDEC four-layer board, and θJC = 2°C/W to the exposed pad. The EP must be soldered to a solid GND plane to achieve specified performance - particularly for SNR and full-scale accuracy - and supports operation from –40°C to +125°C ambient.