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AFE782H1: AFE782H1 Evaluation board circuit

Part Number: AFE782H1

Tool/software:

In AFE782H1 Evaluation board circuit the HART Output from the IC going through C12,R14 forming LPF whose Cutoff frequency is 338.7Hz but HART signal frequency is 1200hz to 2200hz then signal will attenuates.

can you explain this?