Thursday, 18 August 2016

Proper method to filter inputs of a (true) differential ADC


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 enter image description here


The other with a capacitor between differential inputs: enter image description here


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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