In datasheets of different true differential ADCs I noticed two kinds of a low pass filter at the inputs. First one with 2 capacitors to the ground
The other with a capacitor between differential inputs:
So what is the proper way to place a filter at the inputs? When each (or perhaps both) of these filters should be used? in general at first ?
And now for my case where I have DC signals as input, so a filter would be used not for antialising, but rather for bandlimiting the input noise? I guess it is not a good idea to try to bypass the inputs of the ADC?
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