Analog Devices Inc./Maxim Integrated MAX1236KEUA+T

Overview

The MAX1236KEUA+T from Maxim Integrated is a low-power, 12-bit, 4-channel analog-to-digital converter with integrated track/hold, 4.096V internal reference, I²C-compatible 2-wire serial interface, and operation from 4.5V to 5.5V supply. It delivers 94.4ksps throughput, ±1 LSB INL, and consumes only 670µA at full rate-enabling precision data acquisition in space-constrained, battery-sensitive industrial sensor nodes.

For engineers reviewing the MAX1236KEUA+T datasheet, MAX1236KEUA+T pinout, MAX1236KEUA+T application, or MAX1236KEUA+T equivalent, this page provides verified electrical specifications, µMAX® package layout, I²C timing modes (Fast/High-Speed), unipolar/bipolar input configuration, and real-world use cases in handheld instrumentation and system supervision.

Technical Context

The MAX1236KEUA+T employs successive-approximation architecture with fully differential track-and-hold circuitry, supporting software-configurable single-ended (4-channel) or differential (2-channel) analog inputs. Its internal 4.096V reference sets a 0V–4.096V unipolar full-scale range, while external reference support (1V to VDD) enables flexible scaling.

It operates exclusively in I²C slave mode with factory-programmed 7-bit address 0110100, supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz), and uses AutoShutdown™ to reduce current to <1µA between conversions-critical for intermittent-sampling applications like solar-powered remote monitoring.

Key Specifications

Pinout & Package

The MAX1236KEUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for high-density PCB layouts and thermal performance in enclosed enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, I²C ADC applications.

Compared with ADS7822U and MAX11607AUT+, the MAX1236KEUA+T uniquely combines 4.5–5.5V operation, integrated 4.096V reference, and µMAX packaging-making it the only drop-in solution for legacy 5V sensor nodes requiring minimal layout change and zero external reference components.

Availability

The MAX1236KEUA+T is available at Aetrix Electronics and suitable for handheld portable applications, battery-powered test equipment, and system supervision requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long-term production continuity.

Supply support for MAX1236KEUA+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 industrial, medical, and communications applications-with emphasis on integration, low power, and reliability.

The MAX1236–MAX1239 family was engineered for ultra-low-power, multi-channel data acquisition in size- and energy-constrained systems-delivering 12-bit accuracy without external references, clocks, or track/hold circuits.

FAQ

What is the absolute maximum input voltage range for the MAX1236KEUA+T analog inputs?

The MAX1236KEUA+T analog inputs (AIN0–AIN3/REF) tolerate voltages from (GND − 0.3V) to (VDD + 0.3V) without damage, per Absolute Maximum Ratings. However, for accurate 12-bit conversion, input signals must stay within 0V to VDD (≤5.5V) and avoid exceeding GND by more than 50mV or VDD by more than 50mV. Exceeding these limits causes nonlinearity or code errors, even if within safe-clamp bounds.

Does the MAX1236KEUA+T support differential input mode, and how is it configured?

Yes, the MAX1236KEUA+T supports fully differential input mode across two channels (e.g., AIN0–AIN1, AIN2–AIN3). Configuration is done via the SGL/DIF bit in the setup byte: setting SGL/DIF = 0 selects differential mode. In this mode, the BIP/UNI bit determines whether the range is unipolar (0 to VREF) or bipolar (±VREF/2), with output coding in two's complement for bipolar operation.

Can the MAX1236KEUA+T operate with an external reference, and what are the voltage limits?

Yes, the MAX1236KEUA+T accepts an external reference applied to the AIN3/REF pin, with valid voltage range from 1V to VDD (4.5V to 5.5V). When using external reference, the internal 4.096V reference is disabled. Performance remains specified (±1 LSB INL, 70dB SINAD) across the full 1V–VDD range, though noise floor and drift follow the external reference's characteristics-not the internal spec.

What I²C clock frequencies does the MAX1236KEUA+T support, and how is High-Speed Mode enabled?

The MAX1236KEUA+T supports I²C Fast Mode (up to 400kHz) and High-Speed Mode (up to 1.7MHz). High-Speed Mode is activated by the master sending the HS-mode master code (0000 1XXX) followed by a repeated START and the device's slave address (0110100). The device responds with a not-acknowledge to confirm HS-mode entry-no hardware strapping or register write is needed.

How does AutoShutdown™ reduce power consumption in the MAX1236KEUA+T, and when is it active?

AutoShutdown™ automatically powers down the MAX1236KEUA+T's analog core and reference between conversions, reducing supply current to <1µA at low throughput rates (<1ksps). It activates after each conversion completes and remains active until the next I²C read command initiates a new acquisition cycle-requiring no software control or dedicated enable pin.