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TIDM-1008: TIDM-1008 inquiry

Part Number: TIDM-1008

I have a question related to this reference design. in the schematic of the reference design the differential signal of the encoder is going through a signal processing stage consisting of op amp buffers and at the end there is a differential op amp I can't actually get what is the function of having 1.65V at the end of the RC filter at the non-inverting input of the differential op amp