Hi Sean,
Thanks for the reply
From my experience I know that if the cable connecting the sensor output to board is maintained at virtual ground the cable capacitance will not affect the sensor measurement, as there is no leakage to ground through cable capacitance then. But with AD7745 this is not the case. It is at some higher potential and so some leakage will be there which will affect the sensor data.
So, is there any front end circuit(between sensor output and Cin pin of AD7745) that I can use so that the output cable could be maintained at virtual ground potential?