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AD8597 to Filter ADR440

Dear Team,

I would like to know more about the attached circuit Please share your thoughts.

In this circuit, the output of ADR440 is filtered first using an active LPF and then using a passive LPF.

The output of the 2nd filter is going to the I/P of an ASIC.

May I know why they will be doing this. Please share your thoughts.

Regards

Hari