Analog Devices Inc./Maxim Integrated MAX1402EAI+T

Overview

The MAX1402EAI+T from Maxim Integrated is a low-power, 18-bit sigma-delta analog-to-digital converter (ADC) with three fully differential or five pseudo-differential input channels, matched 200µA on-chip current sources for sensor excitation, and 16-bit accuracy at up to 480sps output data rate. It operates from a +5V analog supply and +3V/+5V digital supply, targeting precision measurement in loop-powered industrial sensors and portable weighing systems.

For engineers reviewing the MAX1402EAI+T datasheet, MAX1402EAI+T pinout, MAX1402EAI+T application, or MAX1402EAI+T equivalent, this page delivers verified technical context, real-world interface behavior, confirmed resolution vs. throughput trade-offs, and validated alternative options for multichannel, low-power, high-accuracy ADC selection in harsh-temperature industrial instrumentation.

Technical Context

The MAX1402EAI+T employs a sigma-delta modulator with programmable digital decimation filtering, enabling user-selectable resolution–rate trade-offs: true 16-bit performance at ≤480sps, or reduced resolution for higher throughput. Its modulator sampling frequency is configurable for lowest power dissipation or highest throughput, and its digital filter supports notch placement at 50Hz/60Hz line frequencies when driven by 2.4576MHz or 1.024MHz master clocks.

This ADC integrates two fully differential calibration channels (CALGAIN±, CALOFF±), supports automatic channel scanning, and features an offset DAC with ±117% full-scale range compensation. Input gain is programmable from +1V/V to +128V/V across all channels, with independent configuration of differential/pseudo-differential modes and unipolar/bipolar input ranges.

Key Specifications

Pinout & Package

The MAX1402EAI+T is housed in a 28-pin SSOP (Shrink Small Outline Package) with exposed pad, optimized for thermal performance and board space efficiency in portable and loop-powered designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel, low-power, sigma-delta ADC applications.

Compared with ADS1258IRTCR and AD7798BRUZ, the MAX1402EAI+T uniquely combines 16-bit accuracy at 480sps, matched on-chip 200µA excitation, -40°C to +85°C operation, and hardware-configurable 50/60Hz rejection-making it optimal for battery- or loop-powered industrial sensors where integration, power, and noise immunity are co-constrained.

Availability

The MAX1402EAI+T is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered pressure transducers, and portable weigh scales requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1402EAI+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.

The MAX1402 product line targets high-accuracy, low-power data acquisition in resource-constrained industrial sensing systems, emphasizing integrated excitation, calibration, and line-noise rejection without external components.

FAQ

What is the maximum output data rate with guaranteed 16-bit no-missing-codes performance for the MAX1402EAI+T?

The MAX1402EAI+T achieves guaranteed 16-bit performance with no missing codes at an output data rate of up to 480 samples per second (sps). This specification holds across the full industrial temperature range (-40°C to +85°C) and is validated with the digital decimation filter configured for maximum resolution. Higher data rates are possible but reduce effective resolution below 16 bits.

Does the MAX1402EAI+T include on-chip current sources for sensor excitation, and what are their key specifications?

Yes, the MAX1402EAI+T integrates two matched 200µA transducer excitation current sources (OUT1 and OUT2). These sources exhibit ±1% initial tolerance and 100ppm/°C drift over temperature, with a compliance voltage range of ±2.5V relative to AGND. They enable direct biasing of resistive sensors like strain gauges and RTDs without external components.

Can the MAX1402EAI+T reject 50Hz and 60Hz line interference without external filtering?

Yes, the MAX1402EAI+T's digital decimation filter can be programmed to place nulls at 50Hz and 60Hz (and harmonics) when operated with a 2.4576MHz or 1.024MHz master clock. This delivers up to 100dB normal-mode rejection and 150dB common-mode rejection at those frequencies-eliminating the need for external analog notch filters in industrial environments.

How many analog input channels does the MAX1402EAI+T support, and how are they configured?

The MAX1402EAI+T supports three fully differential input channels (AIN1/AIN2, AIN3/AIN4, AIN5/AIN6), configurable as five pseudo-differential channels using AIN6 as a common reference. Additionally, CALGAIN± and CALOFF± serve as two auxiliary fully differential inputs when calibration is disabled-enabling up to seven total analog input paths in auto-sequence mode.

What digital interface protocol does the MAX1402EAI+T use, and is it compatible with standard microcontrollers?

The MAX1402EAI+T uses a 3-wire serial interface compatible with SPI and QSPI protocols, featuring CS, SCLK, DIN, and DOUT lines plus an interrupt output (INT). It operates with standard CMOS logic levels and supports both active-high and active-low SCLK idle configurations. The interface is directly compatible with most ARM Cortex-M, PIC, and MSP430 microcontrollers without level-shifting.