MCP3424-E/SL: A High-Precision 18-Bit ΔΣ ADC with I²C Interface and On-Board Reference from Microchip

In the realm of data acquisition and precision measurement, the ability to accurately convert analog signals into digital data is paramount. The MCP3424-E/SL from Microchip Technology stands out as a highly integrated, high-performance solution designed to meet these demanding requirements. This device is an 18-bit delta-sigma (ΔΣ) analog-to-digital converter (ADC) that combines exceptional accuracy with user-friendly features, making it an ideal choice for a wide range of applications, including industrial instrumentation, sensor interfaces, and portable medical devices.

At the core of the MCP3424-E/SL is its sophisticated delta-sigma conversion technology. This architecture is renowned for its ability to deliver high-resolution data with excellent noise rejection, particularly effective for measuring low-frequency signals like those from thermocouples, load cells, or pressure sensors. The device provides four differential input channels, offering flexibility to connect multiple sensors simultaneously. A key feature that enhances its precision is the integrated on-board 2.048V reference voltage, which ensures stable and accurate conversions by minimizing errors associated with external reference drift.

Communication with a host microcontroller is simplified through the ubiquitous I²C serial interface. This two-wire interface reduces the number of pins required for connection, facilitating a compact design. The MCP3424-E/SL is also a low-power device, featuring a one-shot conversion mode that allows it to enter a low-power standby state between conversions, which is critical for battery-powered applications. Furthermore, it offers user-programmable configurable data rates (3.75, 15, 60, or 240 samples per second) and gain settings (x1, x2, x4, or x8), allowing designers to tailor the trade-off between resolution and speed for their specific needs.

The combination of high resolution, multiple input channels, an integrated reference, and a simple serial interface makes the MCP3424-E/SL a versatile and reliable building block for creating sophisticated and accurate measurement systems.

ICGOODFIND: The MCP3424-E/SL is a highly integrated and precise 18-bit ΔΣ ADC. Its combination of four differential channels, an on-board voltage reference, and an I²C interface makes it a superior choice for designers seeking to achieve high accuracy with minimal external components in space-constrained and power-sensitive applications.

Keywords:

1. 18-Bit ADC

2. Delta-Sigma (ΔΣ)

3. I²C Interface

4. On-Board Reference

5. Differential Inputs