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LMP7732: Circuit Understand

Part Number: LMP7732

Hello,

I have one 2nd order filter circuit attached.

This circuit I got from some previous designer and I don't have any documentation.

The circuit I have simulated  is working perfectly.

I just want to understand the discrete components used in the circuit(like 47E and 2.2nF) which are other than normal 2nd order LPF filter.