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OPA2187: Zero-drift is 7mV

Amelie Zheng
Genius 10865 points
Part Number: OPA2187

Hi Team,

My customer now use OPA2187 and meet the zero -drift problem. They test the zero- drift is 7mV  25 ℃, higher than datasheet's value 10µV, 0.001µV/C˚

Could you please give some advice? thanks!

  • 0
    Guru 47485 points

    Without a circuit, the only option is to suggest they either have a bad part or poor measurement methods. 

  • 0
    TI__Guru* 93105 points

    Hi Amelie,

    Michael's response is to the point; we must see the OPA2187 circuit schematic to be able to provide assistance. Along with the schematic please be sure to include power supply levels applied to the V+ and V- pins, any applied input voltage level, and any output load conditions during the offset/temperature test.

    One quick check the customer can make is to connect a 10x probe/DSO to the OPA2187 output and check for high frequency oscillation. If the circuit is unstable and oscillating that will corrupt the offset measurement. If that proves to be the case, then there is a circuit design problem.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0
    TI__Genius 10850 points

    Hi Amelie,

    We haven't heard from you in a while. We hope the issue was resolved. I am going to close thing thread now, please reply to reopen if you have any additional questions / information.