Hello BMS, I apologized for late response. I'm not sure whether you have solved the issue or not. It is not easy to check your simple schematic, even the buffer amplifier PN is not shown above. I suggest you to check if there is an oscillation on your amplifier circuit's output with an oscilloscope when you connect this circuit to ADC's input, also suggest you to do a simulation in TI-TINA to check the stability of your amplifier(INA+Differential amplifiers) plus the buffer and RC filter before ADC input. Please refer to the videos how to perform the simulations to check stability from Precision Labs - Op Amps: TI Precision Labs - Op Amps: Stability TINA-TI Thanks&Regards Dale
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