I would like to konw frequency characteristic of AD7794 input buffer and differential amplifier such as PSRR, CMRR, since I could not find any freqency characteristcs in data sheet.
the CMR and PSR numbers listed in the datasheet are for the PGA on and the buffer enabled. We measure PSR at dc only while the CMR is measured at dc, 50 Hz and 60 Hz. These are the main frequencies of concern to most customers.
Thanks you so much for your reply. I am thinking the situation below which is likely happened in our applications.
We will use differential mode input with 50Hz sampling. And the input signals for + and – have both 1 Hz differential mode component and 10 KHz common mode component. So this case, I would like to know CMRR performance of differential amp at 10 KHz in AD7794.
I will email some information to you which should be useful.
Thank you very much for your reply. It is helpful for me for my desgin.
Retrieving data ...