AnsweredAssumed Answered

Please let me know the input impedance.

Question asked by DMN on Aug 4, 2015
Latest reply on Aug 12, 2015 by DMN

Dear all,


Currently, my customer has planned the electroencephalograph for except for the human being.


It is necessary to miniaturize it very much.

And, The op-amp used for this application needs a very high input impedance.


Though they chose AD8643, the input impedance cannot be found in a data sheet.


We want the following 3 parameters.


  • Input Resistance
  • Input Capacitance, Differential Mode
  • Input Capacitance, Common Mode


Please provide, if there are a target design value and evaluation test data.


Best Regards,