The Microchip MCP3421 is a single-channel, low-noise, high-accuracy ΔΣ A/D converter designed for applications requiring precision and low power. It incorporates an on-board 2.048V reference voltage and a programmable gain amplifier (PGA) allowing for a wide input range and high resolution. The device utilizes a two-wire I2C serial interface and operates from a single 2.7V to 5.5V power supply, making it suitable for portable instrumentation, weigh scales, and precision sensing applications. Its features include self-calibration, continuous or one-shot conversion modes, and low current consumption.