I have rigged up a circuit with AD8421,supply voltages +30V (+Vs) and -2.5V (-Vs). The circuit is working properly at only unity gain, when i have tried to put up some gain around 10 to 100, the output of the amplifier is not up to the calculated value. No issues with the circuit connections. Am i wrong with the ic selection? Is there any fixed gain version of this ic? Part Number of IC: AD8421ARZ. Is there any issue with the supplies? Any reply will be helpful.