MCP3422A6T-E/SN

Analog To Digital Converters (ADC) Overview

The MCP3422A6T-E/SN is an 18-bit delta-sigma analog-to-digital converter (ADC) from Microchip Technology, featuring two differential input channels and an I²C serial interface. It integrates a 2.048V internal voltage reference, a programmable gain amplifier (PGA), and an on-board oscillator. The device supports data rates of 3.75, 15, 60, or 240 samples per second, corresponding to resolutions of 18, 16, 14, or 12 bits respectively. Operating on a single supply of 2.7V to 5.5V, it consumes typical current of 135 µA in continuous conversion mode at 3V. The 'T' suffix indicates tape and reel packaging, while 'SN' denotes the SOIC-8 package.

Analog To Digital Converters (ADC) Feature Summary

• 18-bit resolution with differential inputs and integrated 2.048V ±0.05% voltage 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 cycle

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 measurements
• Weigh scales and battery fuel gauges

Analog To Digital Converters (ADC) Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape and reel packaging as specified by Microchip. Confirm the 'SN' suffix indicates the SOIC-8 package. Ensure the specific variant matches the required channel count and factory-programmed I²C address configuration for the MCP3422 series.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring high-resolution differential signal acquisition with minimal external components. The fixed I²C address for the MCP3422 limits multi-device addressing compared to the MCP3423/4. Consider the 135 µA typical current consumption for battery-powered designs and ensure the source impedance is low enough to charge the internal sampling capacitor effectively.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MCP342X family of low-power, high-accuracy delta-sigma ADCs. Unlike the MCP3423 and MCP3424, which feature configurable I²C addresses via external pins, the MCP3422 has its address programmed at the factory. It shares electrical characteristics with the rest of the family but is limited to two differential channels.

Analog To Digital Converters (ADC) Replacement Considerations

Direct replacements within the same package and functionality include other MCP3422 variants with different suffixes (e.g., MCP3422A0-E/SN). Cross-family replacements like the MCP3423 or MCP3424 offer additional channels and address configurability but require pinout and software adjustments.