SOLVED: How can I reduce ADC jitter

[Demon]

Lets clarify something Robert please.

Do you expect to have an ADC reading that will be absolutely stable on every pot position? Say that a user can set 1023 positions on the pot. Do you expect to have solid 1023 readings? ...

No, I was expecting a reading ranging between 0 and 1023, with 256 near 1/4 rotation (from available travel or course), 512 midway and 768 about 3/4 through.

[Ioannis]

Yes, you can expect that, depending on the pot of course.

But the readings will have a play around the specific point, because of what I explained.

Ioannis

[richard]

But the readings will have a play around the specific point

agreed , at the 1/4 turn posn the raw reading expected WHEN vref == vdd and vdd is a well filtered stable supply would be 256 + or - 1 count. if you want better than that use either a 12 bit adc or averaging or oversampling. none of which come without a cost.


This all becomes a ridiculous overkill if the "pot" for instance represents say the 'CHOKE' position when it is displayed as 0-100 in 5% steps.

i have asked several times now what are your expectations ?