Analog Devices Inc./Maxim Integrated MAX11135ATI+T

Overview

MAX11135ATI+T from Maxim Integrated is a 12-bit, 4-channel, 500ksps successive-approximation register (SAR) ADC with external reference support, 1.5MHz full-linear bandwidth, ±1 LSB INL/DNL, and 70dB SINAD at 250kHz input. It operates from 2.35V–3.6V, consumes 4.2mW at 500ksps, and targets portable data-acquisition systems requiring high accuracy and low power.

For engineers reviewing the MAX11135ATI+T datasheet, MAX11135ATI+T pinout, MAX11135ATI+T application, or MAX11135ATI+T equivalent, key selection criteria include its 4-channel TQFN-28 configuration, SampleSet programmable sequencing, internal FIFO for burst sampling, bipolar/unipolar input flexibility, and SPI/QSPI/MICROWIRE-compatible 3-wire interface.

Technical Context

The MAX11135ATI+T implements a SAR architecture with dual clock modes: internally clocked (with integrated 16-entry FIFO and configurable averaging) and externally clocked (enabling SampleSet channel sequencing up to 256 entries). Its analog front-end supports single-ended, pseudo-differential, and fully differential inputs across all four channels, with software-selectable bipolar ranges (±VREF+/2 or ±VREF+).

It features true differential track-and-hold, 30ps RMS aperture jitter, and guaranteed no missing codes over –40°C to +125°C. The 8MHz 3-wire serial interface uses CS, SCLK, and DOUT/DIN with EOC signaling - compatible with SPI, QSPI, and MICROWIRE without level-shifting logic.

Key Specifications

Pinout & Package

The MAX11135ATI+T is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), optimized for thermal performance and PCB space efficiency in compact designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS8684IPWR and AD7949BCPZ-RL7, the MAX11135ATI+T offers optimal balance of 12-bit accuracy, 500ksps throughput, 4-channel count, and ultra-low 4.2mW active power - making it uniquely suited for space-constrained, battery-operated instrumentation where speed, precision, and efficiency are jointly critical.

Availability

MAX11135ATI+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial motor monitoring, battery-powered data loggers, high-speed closed-loop control, and environmental instrumentation requiring stable component supply and long-term production continuity.

Supply support for MAX11135ATI+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 MAX11135ATI+T belongs to the MAX11135–MAX11143 family of low-power, high-speed SAR ADCs engineered specifically for battery-operated and thermally constrained data-acquisition systems needing high linearity, flexible input configuration, and intelligent power management.

FAQ

What is the maximum sampling rate supported by the MAX11135ATI+T?

The MAX11135ATI+T supports a maximum sampling rate of 500ksps in both internal and external clock modes. At this rate, conversion time is 5.9µs (internal clock) or 2000ns (external 8MHz SCLK), with no pipeline delay - enabling true real-time acquisition for transient event capture and closed-loop control applications.

Does the MAX11135ATI+T require an external reference voltage?

Yes, the MAX11135ATI+T requires an external differential reference applied to REF+ and REF− pins. REF+ accepts 1V to VDD; REF− can be grounded or biased. An external reference is mandatory - the device does not include an internal reference. Bypassing REF+ to GND with a 0.47µF capacitor is required for stability.

How many analog input channels does the MAX11135ATI+T have, and how are they configured?

The MAX11135ATI+T has four analog input channels (AIN0–AIN3), configurable as single-ended, pseudo-differential (relative to REF−), or fully differential pairs. All channels support software-selectable unipolar (0 to VREF+) or bipolar (±VREF+/2 or ±VREF+) input ranges - no external signal conditioning is needed for common sensor interfaces.

What package type and pin count does the MAX11135ATI+T use?

The MAX11135ATI+T uses a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP). Pinout is optimized for 4-channel operation: AIN0–AIN3 occupy dedicated pins; REF+, REF−, CNVST, CS, SCLK, DIN, DOUT, EOC, VDD, OVDD, DGND, and GND are fully assigned per the official pin diagram - no shared or multiplexed analog/digital functions on input pins.

Can the MAX11135ATI+T interface directly with a 1.8V microcontroller?

Yes, the MAX11135ATI+T supports 1.5V–3.6V digital I/O supply (OVDD), allowing direct connection to 1.8V microcontrollers. Logic thresholds scale with OVDD (VIH = 0.75×OVDD, VIL = 0.25×OVDD), and DOUT is three-state when CS is high - eliminating need for level shifters in mixed-voltage systems.