I am using the AD5293 (100K) digital potentiometer along with the AD8675 Op amp. I want to have a variable gain, to amplify the output of a tranformers.
The input signal is 50Hz.
I set the gain to 128, programming D=1016, and i calibrate my circuit. Everything fine till here. But then, there is a drift in the error. It takes more than 20 minutes to be stable, but not enough stable. If i use a resistors it doesnt happen.