Offset Voltage adjustment for OP177

Dear Sir/Madam,

Our customer asked th following question to me.

As for your OPAMP OP177GSZ,

your datasheet shows the adjustable offset voltage adjustment range is +/-3mV typ by adding 20kohm POT on Rp.

So if we need it +/-6mV, then what is the external Rp value?

10kohm POT?

V+,V-=+/-15V

Maybe this was shown in past sled here but I could not find it sorry

Thanks Kaos

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  • Hi Harry,

    Customer have put your OP177 on their inspection device and it have fixed so it cannot replace it to another recommended new device like a ADA4638.

    Therefore customer followed your instructed way adjust the output offset voltage.

    You commented to put the 10k ohm POT on the 1-8 pin, but customer could not bring the expected result.

    So he asked why the adjustment result not so good to us.

    This is the reason why he ask again for OP177.

    As for Instructed way adjustment offset voltage, does it support for V/I converting circuit or not?

    Thanks Kaos

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