I'm evaluating the AD7745 and since it gives me wrong values I am going to calibrate it. Unfortunately I did not understand the procedure. Datasheet says I can connect a "zero-scale capacitance", but what does it mean? I tried with a short but it saturates, what is a zero-scale capacitance?
The second method is to "calculate and write the offset calibration register value", yes but with which value? What I have to calculate?
Thank you for your help.