App note: Improving ADC resolution by oversampling and averaging


Silicon Labs’ application note (PDF!) on improving ADC resolution  by oversampling and averaging:

This application note describes utilizing oversampling and averaging to increase the resolution and SNR of analog-to-digital conversions. Oversampling and averaging can increase the resolution of a measurement without resorting to the cost and complexity of using expensive off-chip ADCs.
This application note discusses how to increase the resolution of analog-to-digital (ADC)measurements by oversampling and averaging. Additionally, more in-depth analysis of ADC noise, types ofADC noise optimal for oversampling techniques, and example code utilizing oversampling and averaging is provided in appendices A, B, and C respectively at the end of this document.

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