I have a circuit in which I am using 3-channel reading, I am using an external reference of 1.25 V to read 2 channels and in 1 channel I am using an internal reference of 2.048V.
I would like to know what would be the best practices for making an acquisition, as I realize that the value at the ADC input is varying (oscillation) in the order of 10uV, but in the acquisition the value ends up varying by 30uV.
My signal is Dc and the acquisition is at 20 SPS.
* What would be the best time to perform the channel change, if I take a reading and change the channel could I have a problem related to delta sigma acquisition?
*When is the best time to calibrate the ADC Offset?
* Could you give me some good practices, because I intend to work very close to the minimum resolution of the ADC (1.25V/32768 =38.14uV)