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PGA input impedances at ADS1298R

Other Parts Discussed in Thread: ADS1298R

Hi,

 

I want to test a method for measure electrode impedance unbalances using ADS1298R EVM. To do this, I need to know PGAs common mode input impedances with current source lead-off detection enabled. In the datasheet a 500MOhms DC input impedance is specified. Is this impedance in differential mode, common mode or both?

 

Thanks.