ADS1231REF: Selection criteria and calculations of Feedthrough capacitor in circuit C38 and C39

Hi,

I am not understanding how the capacitors C38 and C39 are selected in design.

What is the criteria to select these capacitors in input signals and what will be the cutoff frequency achieved from these capacitor?

Also I am trying to understand filter calculations for input signal SIG+ and SIG- ?

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Nikhil F