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ADS8528: Input impedance for analog input

Part Number: ADS8528

Tool/software:

I am using the ADS8528 ADC from TI. I have checked the datasheet to find the input impedance for the analog input, but I can’t find this information.

Could you help to provide this information? I am using a RC filter before the ADC; I want to make this RC filter will not impact the voltage input due to resistor voltage division.