The MCP3564 is a 24-bit sigma-delta ADC with support for up to eight single-ended, or four differential channels. It supports extensive oversampling depths, flexible MUX front-end, circuit burnout detection, adjustable gain, Vref from [0v - 3.6v], and optional internal oscillator.

This is revision 3, with an onboard high-accuracy oscillator.

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Source at github

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