Chopper opamp leakage with output at max/min values?

[incf]

Hi,

I have a circuit where I used a TSZ121 chopper opamp. I found that when the output of the amplifier is at its min/max (ie. the inverting and non-inverting inputs are not equal) it shows about 10 microamps of leakage through one of the input terminals.

Is this normal for a chopper opamp?

Thanks!

[Kleinstein]

To a certain degree this is normal. Also other OP-amps often have a relatively low differential input resistance.
Internally the inputs are switched, between different paths and if there is a voltage difference between the inputs they often start with a different voltage and the capacitance pumps out some charge. 10  µA still sounds high.