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Input offset voltage level of AD8629

Question asked by Kaos on Dec 15, 2015
Latest reply on Dec 17, 2015 by Kaos

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

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