Analog Devices Inc./Maxim Integrated MAX11142ATI+T

Overview

MAX11142ATI+T from Maxim Integrated is an 8-bit, 8-channel, 500ksps successive-approximation register (SAR) analog-to-digital converter with external reference support, 1.5MHz full-linear bandwidth, ±0.02 LSB INL, and 4.2mW power consumption at 3V/500ksps. It operates from 2.35V to 3.6V, supports single-ended/differential/pseudo-differential input configurations, and targets portable data acquisition in industrial sensor interfaces.

For engineers reviewing the MAX11142ATI+T datasheet, MAX11142ATI+T pinout, MAX11142ATI+T application, or MAX11142ATI+T equivalent, key selection criteria include its 8-channel TQFN-28 pinout, SampleSet programmable channel sequencing, internal FIFO for burst sampling, AutoShutdown mode with 2µA shutdown current, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface.

Technical Context

The MAX11142ATI+T implements a SAR architecture with dual clock modes: internal clock mode (enabling integrated 16-entry FIFO and internal averaging for improved SNR) and external clock mode (supporting SampleSet technology for user-defined channel sequences up to 256 steps). It features true differential track-and-hold with flexible analog multiplexer routing.

Its analog front end supports three input types per channel-single-ended, fully differential, or pseudo-differential-with software-selectable bipolar ranges (±VREF+/2 or ±VREF+) and configurable common-mode reference. The device guarantees no missing codes and maintains ±0.15 LSB DNL across –40°C to +125°C.

Key Specifications

Pinout & Package

The MAX11142ATI+T is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), rated for –40°C to +125°C operation. Pin functions are validated per Maxim's official pin configuration diagram for the 8-channel variant (MAX11136/MAX11139/MAX11142).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit multichannel SAR ADC applications.

Compared with ADS7957IRHBT and AD7476AWYRMZ-REEL7, the MAX11142ATI+T uniquely combines 8-channel integration, SampleSet programmability, and 16-deep FIFO in an ultra-low-power 8-bit SAR ADC-making it optimal for resource-constrained embedded systems needing intelligent, autonomous multichannel acquisition.

Availability

MAX11142ATI+T is available at Aetrix Electronics and suitable for industrial sensor hubs, portable medical monitors, automotive cabin air quality systems, and smart energy meter sensor interfaces requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.

Supply support for MAX11142ATI+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 MAX11135–MAX11143 family-including MAX11142ATI+T-is engineered for low-power, high-channel-count data acquisition in space-constrained, battery-operated, or thermally harsh environments where integration, flexibility, and guaranteed performance across temperature are critical.

FAQ

What is the maximum sampling rate supported by the MAX11142ATI+T?

The MAX11142ATI+T supports a maximum sampling rate of 500ksps in both internal and external clock modes. At this rate, conversion time is 2000ns when externally clocked at 8MHz, or 5.9µs in internally clocked mode. This enables accurate digitization of input signals up to 250kHz while maintaining no pipeline delay-a key advantage over sigma-delta or pipelined architectures.

Does the MAX11142ATI+T require an external reference voltage?

Yes, the MAX11142ATI+T requires an external differential reference applied between REF+ and REF– pins. REF+ accepts 1V to VDD, and REF– can be grounded or biased to set common-mode level. The device does not include an internal reference; accuracy and noise performance directly depend on the stability and cleanliness of the external reference source.

How many analog input channels does the MAX11142ATI+T support, and what configurations are available?

The MAX11142ATI+T supports 8 analog input channels (AIN0–AIN7). Each channel can be independently configured as single-ended, fully differential, or pseudo-differential relative to a common input. Input ranges are software-selectable between unipolar (0 to VREF+) and bipolar (±VREF+/2 or ±VREF+), enabling direct interfacing with diverse sensor signal types without external level-shifting circuitry.

What power-saving features does the MAX11142ATI+T offer?

The MAX11142ATI+T offers AutoShutdown mode (2µA typical), fast wake-up (<1µs), and configurable power states including full shutdown, AutoStandby, and normal operation. Power dissipation is 4.2mW at 3V/500ksps and scales linearly with supply voltage and sample rate-enabling dynamic power management in battery-powered applications where duty cycling is essential.

Is the MAX11142ATI+T compatible with standard SPI interfaces?

Yes, the MAX11142ATI+T features an 8MHz, 3-wire SPI-compatible serial interface (CS, SCLK, DIN/DOUT) that connects directly to SPI, QSPI, and MICROWIRE controllers without level shifters or glue logic. It supports standard SPI modes with data valid on SCLK falling edge, and DOUT enters high-impedance state when CS is high-ensuring seamless integration into existing microcontroller platforms.