The MCP3425 is a single channel low-noise, high accuracy ΔΣ A/D converter with differential inputs and up to 16 bits of resolution in a small SOT-23-6 package. It features self calibration of internal offset and gain per each conversion, a precision 2.048V reference voltage, and an on-board programmable gain amplifier. It supports programmable data rate options, one-shot or continuous conversion options, and I2C serial interface. The MCP3425 is suitable for portable instrumentation, weigh scales and fuel gauges, temperature sensing with RTD, thermistor, and thermocouple, and bridge sensing for pressure, strain, and force applications.
The MCP3425 is a single‑channel, 16‑bit delta‑sigma analog‑to‑digital converter offered in a compact SOT‑23‑6 package. It features an on‑board 2.048 V voltage reference, selectable PGA gains of 1, 2, 4 or 8, and programmable data‑rate options of 15, 60 or 240 samples per second. The device operates from a single 2.7 V to 5.5 V supply and supports standard, fast and high‑speed I²C communication modes.
Low‑power operation is a key characteristic: continuous conversion draws only 145 pA typical, while standby (one‑shot) mode can be as low as 0.5 pA. The converter provides an INL of 10 ppm of full‑scale range and includes self‑calibration of offset and gain for each conversion. Detailed pin descriptions, electrical characteristics, and performance curves are provided for designers.
| Resolution | 16 bits |
|---|---|
| Data‑rate options | 15, 60, 240 SPS |
| Supply voltage | 2.7 V to 5.5 V |
| Supply current (continuous) | 145 pA typical |
| On‑board reference voltage | 2.048 V |
| PGA gain options | 1, 2, 4, 8 |
| Integral non‑linearity (INL) | 10 ppm of FSR |
The device contains an on‑board 2.048 V voltage reference.
The PGA can be set to a gain of 1, 2, 4, or 8.