Hi Abhishek, I'm not quite sure what it is you are looking for here. The ADS8689 has registers that you can use to select the input voltage range, so it should be possible to (at least in part) simplify the signal path on the analog input. What does the current 'filter Circuit' look like? Off the top of my head I don't see why necessarily that would need to change to use the ADS8689 instead of the other ADC you noted above.
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