input impedance of the ADuM770X?

Question

I want to put a resistor in the front stage and adjust the gain. What is the input impedance of the ADuM7702?

ZoltanDTI · Accepted Answer

Hi, 
 In the analog input section of the datasheet it is written: " The pseudo differential analog input of the ADuM7702 is implemented with a switched capacitor circuit. ". So it means dynamic load rather than resistive, what is specified: 
 
 In the examples 10 Ohm external impadance can be seen, so I think it is not recommended to use higher, because due to the dynamic input current it will introduce error. Taking the 10 Ohm at full-scale input you just get an error close to the resolution of the ADC. 
 Zoltan)

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input impedance of the ADuM770X?