I have a couple of questions regarding AD7745's resolution:
- can I sense a 5aF capacitance variation in a 1pF nominal capacitance with the 21 ENOB and still have the entire dynamic range (e.g. 350fF) available, assuming a 10Hz BW;
- Is it possible to tune the excitation frequency? if so, what the limit is confirmed to be by a factor of 2 or can I decrease to let's say 4kHz?