Analog Devices Inc./Maxim Integrated MAX11139ATI+T

Overview

MAX11139ATI+T from Maxim Integrated is a 10-bit, 500ksps, low-power, serial-output SAR ADC in a 28-pin TQFN (5mm × 5mm) package. It supports 8-channel single-ended or 4-channel fully differential analog inputs, features SampleSet programmable channel sequencing and internal FIFO, and operates from 2.35V to 3.6V supply with only 4.2mW power at full speed-ideal for battery-powered industrial data acquisition.

For engineers reviewing the MAX11139ATI+T datasheet, MAX11139ATI+T pinout, MAX11139ATI+T application, or MAX11139ATI+T equivalent, key selection criteria include its 10-bit resolution with ±0.4 LSB INL, 61.7dB SINAD at 250kHz, 8MHz SPI/QSPI/MICROWIRE-compatible interface, flexible bipolar/unipolar input configuration, and AutoShutdown mode enabling <6µA shutdown current.

Technical Context

The MAX11139ATI+T implements a successive-approximation register (SAR) architecture with dual clock modes: internal clock (enabling FIFO buffering and on-chip averaging) and external clock (supporting SampleSet programmable channel sequencing). Its analog multiplexer supports true differential track-and-hold across all channels.

It features configurable input ranges (±VREF+/2 or ±VREF+), 1.5MHz full-linear bandwidth, and guaranteed no missing codes over –40°C to +125°C. The 3-wire serial interface operates up to 8MHz with 16-cycle conversion timing and supports channel ID output.

Key Specifications

Pinout & Package

MAX11139ATI+T is housed in a 28-pin, 5mm × 5mm, 0.5mm pitch TQFN package with exposed pad (EP) connected to GND. Pin functions are validated per Maxim's official pin configuration diagram for the 8-channel variant (MAX11139).

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 AD7904BRUZ, the MAX11139ATI+T uniquely balances 10-bit precision, 8-channel flexibility, on-chip FIFO, and ultra-low 4.2mW active power-making it optimal for resource-constrained, battery-operated, multichannel data loggers requiring deterministic timing and minimal firmware overhead.

Availability

MAX11139ATI+T is available at Aetrix Electronics and suitable for industrial process monitoring, battery-powered test equipment, and automotive onboard diagnostics requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX11139ATI+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, automotive, and medical applications.

The MAX11135–MAX11143 family-including MAX11139ATI+T-is engineered for low-power, high-speed multichannel data acquisition in space-constrained, battery-operated, or thermally limited systems.

FAQ

What is the maximum sampling rate supported by the MAX11139ATI+T?

The MAX11139ATI+T supports a maximum sampling rate of 500ksps in both internal and external clock modes. At this rate, conversion time is 2µs (externally clocked, 8MHz SCLK) or 5.9µs (internally clocked), with guaranteed performance including ±0.4 LSB INL and 61.7dB SINAD at 250kHz input frequency.

Does the MAX11139ATI+T support differential input configurations?

Yes, the MAX11139ATI+T supports fully differential input pairs (up to 4 channels), pseudo-differential inputs relative to a common input, and single-ended inputs. Input ranges are software-selectable between ±VREF+/2 and ±VREF+, and all modes maintain ±0.4 LSB INL over –40°C to +125°C.

How does the SampleSet feature work on the MAX11139ATI+T?

The SampleSet feature on the MAX11139ATI+T allows users to define and load a custom 256-step channel sequence into internal registers. This enables autonomous, mixed-rate scanning (e.g., sample temperature every 100ms and vibration every 1ms) without MCU intervention-reducing firmware complexity and system-level noise.

What power-saving modes does the MAX11139ATI+T offer?

The MAX11139ATI+T offers AutoShutdown (1.5µA typical), full shutdown (<6µA), and AutoStandby (0.9mW at 2.35V). In AutoShutdown, it wakes up in <1µs upon CNVST assertion. These modes are controlled via SPI register writes and require no external circuitry-enabling aggressive power cycling in portable instruments.

Is the MAX11139ATI+T pin-compatible with other devices in the MAX11135–MAX11143 family?

No-MAX11139ATI+T is an 8-channel variant in a 28-pin TQFN package and shares pinout compatibility only with MAX11136 and MAX11142 (also 8-channel). It is not pin-compatible with 4-channel (MAX11135/MAX11138) or 16-channel (MAX11137/MAX11140) variants due to differing analog input pin allocations.