MCP3422A5-E/SN

Analog To Digital Converters (ADC) Overview

The MCP3422A5-E/SN is an 18-bit delta-sigma analog-to-digital converter (ADC) from Microchip Technology. It features two differential input channels and operates on a single supply voltage ranging from 2.7V to 5.5V. The device integrates an internal 2.048V voltage reference, a programmable gain amplifier (PGA), and an oscillator. Communication is handled via a two-wire I²C interface supporting Standard, Fast, and High-Speed modes. Key electrical specifications include a typical supply current of 135 µA at 3V in continuous conversion mode and an operating temperature range of -40°C to +125°C.

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 selectable gains of x1, x2, x4, or x8
• Configurable data rates: 3.75 SPS (18-bit), 15 SPS (16-bit), 60 SPS (14-bit), and 240 SPS (12-bit)
• I²C interface with Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes

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
• Factory automation equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'A5' against official Microchip documentation to confirm factory-programmed I²C address settings, as this variant differs from standard models with configurable address pins. Ensure the SOIC-8 package matches the required PCB footprint and thermal management needs for the extended temperature range applications.

Analog To Digital Converters (ADC) Selection Notes

Select this component when high accuracy and low power consumption are critical for multi-channel signal acquisition. The integrated PGA allows for amplification of weak signals without external components. Consider the trade-off between data rate and resolution; higher resolutions (18-bit) result in lower sampling speeds (3.75 SPS). Ensure the input signal remains within the differential full-scale range defined by the selected PGA gain.

Analog To Digital Converters (ADC) Part Context

This part belongs to the MCP342X series of low-power, high-resolution ADCs. While the MCP3422 typically has factory-set addresses, the 'A5' suffix indicates a specific address configuration. Other family members like the MCP3423 and MCP3424 offer additional channels and user-configurable address pins via external connections, whereas the MCP3422 relies on fixed addressing.

Analog To Digital Converters (ADC) Replacement Considerations

Direct substitutes within the same package and pinout include other MCP3422 variants with different factory-set I²C addresses. For applications requiring user-configurable addresses, the MCP3423 may be considered if the pin count and package type allow for the additional address selection pins.