Analog Devices Inc./Maxim Integrated MAX11140ATI+T

Overview

MAX11140ATI+T from Maxim Integrated is a 10-bit, 16-channel, 500ksps successive-approximation register (SAR) ADC with external reference support, 1.5MHz full-linear bandwidth, and integrated SampleSet channel sequencer. It operates from 2.35V–3.6V, consumes 4.2mW at full speed, and targets multichannel data acquisition in battery-powered industrial sensors and portable medical instrumentation.

For engineers reviewing the MAX11140ATI+T datasheet, MAX11140ATI+T pinout, MAX11140ATI+T application, or MAX11140ATI+T equivalent, key selection criteria include its 10-bit resolution with ±0.4 LSB INL, 16-channel analog multiplexer with pseudo-differential configuration, SPI/QSPI/MICROWIRE-compatible 3-wire interface, internal FIFO for burst sampling, and AutoShutdown mode enabling <2µA shutdown current.

Technical Context

The MAX11140ATI+T implements a SAR architecture with dual clock modes: internal clock (enabling FIFO buffering and on-chip averaging) and external clock (supporting SampleSet programmable sequencing). Its analog front-end supports single-ended, fully differential, and pseudo-differential inputs across all 16 channels, with software-selectable bipolar ranges (±VREF+/2 or ±VREF+).

It features a true differential track-and-hold amplifier, 30ps RMS aperture jitter, and guaranteed 61dB SINAD at 250kHz input frequency. The 8MHz serial interface operates with 1.5V–3.6V I/O supply (OVDD), allowing direct interfacing to 1.8V/2.5V/3.3V logic without level shifters.

Key Specifications

Pinout & Package

MAX11140ATI+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 16-channel variant (MAX11140).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8684IPWR and AD7949BCPZ-RL7, MAX11140ATI+T uniquely balances 10-bit precision, 16-channel flexibility, ultra-low 4.2mW power, and intelligent SampleSet/FIFO features - making it optimal for compact, battery-constrained, multichannel acquisition where moderate resolution suffices.

Availability

MAX11140ATI+T is available at Aetrix Electronics and suitable for industrial sensor hubs, portable medical instrumentation, automated test equipment, and smart grid fault detectors requiring stable component supply across extended temperature ranges.

Supply support for MAX11140ATI+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 communications applications.

The MAX11135–MAX11143 family was engineered to deliver high-speed, low-power, multichannel data acquisition in space-constrained, battery-operated systems - emphasizing integrated intelligence (SampleSet, FIFO), wide supply flexibility, and robust AC/DC performance.

FAQ

What is the maximum sampling rate supported by the MAX11140ATI+T?

The MAX11140ATI+T supports a maximum sampling rate of 500ksps in both internal and external clock modes. At this rate, conversion time is 2000ns in externally clocked mode (with 8MHz SCLK) or 5.9µs in internally clocked mode. Full performance specifications - including 61dB SINAD and ±0.4 LSB INL - are guaranteed at 500ksps across the -40°C to +125°C operating range.

Does the MAX11140ATI+T require an external reference voltage?

Yes, the MAX11140ATI+T requires an external reference. REF+ accepts 1V to VDD, and REF-/AIN15 serves as the reference return or 16th analog input. An external reference improves flexibility and accuracy versus internal references, especially in systems where reference stability and temperature drift must be tightly controlled. A 0.47µF capacitor is required between REF+ and GND.

How does the SampleSet feature work on the MAX11140ATI+T?

The SampleSet feature on the MAX11140ATI+T is a user-programmable channel sequencer that stores up to 256 conversion commands in nonvolatile memory. It enables autonomous scanning of any subset of the 16 analog inputs in custom order and repetition - reducing host processor involvement. Commands include channel selection, gain, and range settings, executed without ongoing SPI traffic.

What package type and thermal characteristics does the MAX11140ATI+T use?

The MAX11140ATI+T uses a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP). Its junction-to-ambient thermal resistance (θ_JA) is 29°C/W on a four-layer board. The EP must be soldered directly to the PCB ground plane to ensure thermal performance and electrical integrity. Operating junction temperature is rated to +150°C.

Can the MAX11140ATI+T interface directly with a 1.8V microcontroller?

Yes, the MAX11140ATI+T can interface directly with a 1.8V microcontroller via its independent OVDD supply pin (1.5V–3.6V range). Digital I/O levels (CS, SCLK, DIN, DOUT, EOC) are referenced to OVDD, so setting OVDD = 1.8V ensures compatible logic thresholds (V_IL ≤ 0.45V, V_IH ≥ 1.35V) without level-shifting circuitry.