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AD7745 Resolution

Question asked by RO7 on Apr 24, 2015
Latest reply on Apr 30, 2015 by EricC

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?

 

Thanks!

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