MCP3426A4-E/MS

Analog To Digital Converters (ADC) Overview

The MCP3426A4-E/MS is a 16-bit Delta-Sigma Analog-to-Digital Converter (ADC) featuring two differential input channels and an I²C serial interface. It integrates an on-board 2.048V voltage reference with ±0.05% accuracy and a programmable gain amplifier (PGA) supporting gains of 1, 2, 4, or 8. The device offers selectable data rates of 15 SPS (16-bit), 60 SPS (14-bit), and 240 SPS (12-bit). It operates from a single 2.7V to 5.5V supply, consumes low current, and supports extended temperature ranges from -40°C to +125°C.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with differential inputs and integrated 2.048V reference
• Programmable Gain Amplifier (PGA) with gains of x1, x2, x4, or x8
• I²C interface supporting Standard (100 kHz), Fast (400 kHz), and High Speed (3.4 MHz) modes
• Self-calibration of internal offset and gain for each conversion

Analog To Digital Converters (ADC) Applications

• Portable instrumentation and consumer goods
• Temperature sensing using RTDs, thermistors, and thermocouples
• Bridge sensing for pressure, strain, and force applications
• Weigh scales and battery fuel gauges

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'E/MS' corresponds to the MSOP-8 package and industrial temperature range (-40°C to +125°C) as defined in the official Microchip datasheet DS22226A. Confirm that the factory-programmed I²C address matches system requirements, as the MCP3426 lacks external address selection pins unlike the MCP3427/8 variants.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a dual-channel, high-precision ADC with an I²C interface is required. Ensure the application benefits from the integrated 2.048V reference and PGA to minimize external components. Verify that the I²C bus speed (Standard/Fast/High Speed) is compatible with the host controller and that the MSOP-8 package fits the PCB layout constraints.

Analog To Digital Converters (ADC) Part Context

The MCP3426A4-E/MS belongs to the MCP3426/7/8 family of 16-bit multi-channel ΔΣ ADCs. While electrically similar to the MCP3427 and MCP3428, the MCP3426 is distinguished by its fixed factory-programmed I²C address and availability in 8-pin packages (SOIC, DFN, MSOP). The 'A4' designation typically indicates a specific gain or configuration variant within the series, though core electrical characteristics remain consistent across the family.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements within the same package include other MCP3426 variants with different suffixes (e.g., MCP3426A0-E/MS, MCP3426A1-E/MS) which may differ in factory-set I²C addresses or specific gain configurations. Cross-family replacement with MCP3427 requires accounting for additional address pins.