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Adafruit MCP3421 18-Bit ADC

Adafruit MCP3421 18-Bit ADC

Pimoroni

£4.95

Price read from Pimoroni on 2026-10-22. Check before buying.

The Adafruit MCP3421 18-Bit ADC is a simple, inexpensive, and easy to use 18-bit, 240 SPS, single-channel ADC with an I2C interface that can run up to 3.4MHz clock rate. A perfect component whenever you need an ADC that has differential inputs, adjustable gain, and a built in precision/low-drift reference voltage. One of the trade-offs with getting 18-bit precision is that the ADC is not going to be very fast: you can configure the chip to do a faster 12-bit conversion at 240 SPS, but at 18-bits it slows down to 3.5 SPS. That's because the way a sigma-delta ADC works, it 'guesses' the analog v

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