LTC2484 easy drive problem


here is my circuit and adc output.

I expected LTC2484 easy drive cancel the input current which caused offset and noise.

what is the cause of this offset and noise?

how to utilize easy driver to cancel the offset and noise?

when I changed R20,R21,C20 values to R20=0,R21=56k,C20=1n, the offset value got smaller and the noise occurred less and smaller.

what is the recommended value for them ?