In the datasheet, there is no information about the dc input current of the analog pins (VinA+, VinA-, Vin+, Vin-) of the AD7762. I can measure a input current of about 600 uA at Vin+ and Vin-, dependant to the input voltage (higher input voltage causes higher input current).
600uA are way too much! I get a measurement-error of about 1 percent because of that.
What could be the reasons of this input current?
Please can some expert tell something about the input current and why it is not specified in the datasheet?