Input offset voltage level of AD8629

Dear Sir/Madam,

Our customer found the following matter with your AD8629 OPAMP.

Application is temperature sensor by Thermopile(TP).

Please refer to my enclosed Fig-1 schematic.

In the enclosed schematic, customer replaced TP to fixed resister.175kohm

When power-on, around 90mV  appeared at out-1 pin.

Also gained output around 900mV at out-2.

Question :

Does your AD8629 have the input offset voltage?

Otherwise why this 90mV appear on output?

Please advice us.

Thanks Kaos

Fig-1.pdf
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