The MCP3550/1/3 are 22-bit ADC chips from Microchip Technology Inc. The chip has automatic internal offset and gain calibration function, the output noise is as low as 2.5 µVRMS, the effective resolution is 21.9 bits, the typical offset error is 3 µV, the typical full-scale error is 2 ppm, the maximum INL error is 6 ppm, the total unadjusted error is less than 10 ppm, and it supports no digital filter settling time and single-command conversion through 3-wire SPI interface. In addition, the chip also has ultra-low conversion current (MCP3550/1): the typical value is 100 µA under 2.7V power supply voltage and the typical value is 120 µA under 5.0V power supply voltage. The chip supports VSS to VDD common voltage range differential input, supports 2.7V to 5.5V single-supply operation, and the working temperature range is -40°C to +125°C. MCP3550/1/3 chips are suitable for applications such as weighing scales, direct temperature measurement, 6-digit DVMs, instrumentation, data acquisition and strain gauge measurement.
The MCP3550/1/3 family are low‑power, single‑channel 22‑bit delta‑sigma analog‑to‑digital converters offered in 8‑pin MSOP and SOIC packages. They feature automatic internal offset and gain calibration, ultra‑low conversion current (100 pA typical for MCP3550/1), and a supply range of 2.7 V to 5.5 V. The devices operate from –40 °C to +125 °C and are suited for applications such as weigh scales, temperature measurement, instrumentation, data acquisition, and strain‑gauge measurement.
Key electrical characteristics include a typical output noise of 2.5 µV p‑p, total unadjusted error less than 10 ppm, and a differential input range of ±Vrer. Detailed DC characteristics, temperature specifications, and serial timing parameters are provided for design integration.
| Resolution | 22‑bit |
|---|---|
| Output Noise | 2.5 µV p‑p |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operating Temperature Range | –40 °C to +125 °C |
| Typical Conversion Current (MCP3550/1) | 100 pA |
| Package Types | MSOP, SOIC |
The devices operate from 2.7 V to 5.5 V single‑supply.
Typical conversion current is 100 pA.
They operate from –40 °C to +125 °C.