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.