You can probably work around this completely by just cranking up the sample frequency and lowpass filtering the value before you use it (if the error is just no

You can probably work around this completely by just cranking up the sample frequency and lowpass filtering the value before you use it (if the error is just noise and not bias). Four times as many samples => half the noise (given some reasonable assumptions). Personally, I would have really liked to get higher sampling frequency on the ADC. The raspis are quite limited in that regard compared to more "typical" microcontrollers (would expect 1MSPS or more). Supposedly some people had success overclocking the whole peripheral by a factor of 8, but I'm not so sure that is a good idea...