MCP3422A3-E/MS

Analog To Digital Converters (ADC) Overview

The MCP3422A3-E/MS is an 18-bit delta-sigma analog-to-digital converter (ADC) 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 from a single 2.7V to 5.5V supply, it consumes 135 µA typically in continuous conversion mode at 3V. The component is housed in an 8-pin MSOP package and operates within an extended temperature range of -40°C to +125°C.

Analog To Digital Converters (ADC) Feature Summary

• 18-bit resolution with selectable data rates: 3.75 SPS (18-bit), 15 SPS (16-bit), 60 SPS (14-bit), and 240 SPS (12-bit).
• Integrated 2.048V voltage reference with ±0.05% accuracy and 15 ppm/°C drift.
• Programmable Gain Amplifier (PGA) with gains of 1, 2, 4, or 8.
• Two differential input channels with self-calibration of 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 measurements
• Weigh scales and battery fuel gauges

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix 'E/MS' corresponds to the MSOP-8 package and industrial temperature grade (-40°C to +85°C specified electricals, -40°C to +125°C operating range). Confirm that the 'A3' suffix indicates factory-programmed I²C address bits, as the MCP3422 lacks external address pins unlike the MCP3423/4. Ensure compatibility with standard, fast, or high-speed I²C modes based on system requirements.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring high-resolution differential measurements with minimal external components due to the integrated reference and PGA. The fixed I²C address distinguishes it from the MCP3423, which allows user-configurable addresses via Adr0 and Adr1 pins. Consider the 135 µA typical current consumption for battery-powered designs. Verify that the source impedance connected to the inputs is low enough to avoid degrading performance given the switched-capacitor input structure.

Analog To Digital Converters (ADC) Part Context

The MCP3422A3-E/MS belongs to the MCP342X family of low-power, multi-channel ΔΣ ADCs. It shares core electrical specifications with the MCP3423 and MCP3424 but differs in channel count and address configuration. While the MCP3423 offers two channels with configurable I²C addresses and the MCP3424 provides four channels, the MCP3422 provides two channels with a fixed factory-set address. All variants support the same PGA, reference, and conversion speed options.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the verified source material. Designers should consult Microchip Technology for specific cross-reference recommendations or alternative devices within the MCP342X series or other compatible ADC families.