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OPA189: Warm up drift / thermal shock

John Davis
Prodigy 10 points
Part Number: OPA189

I've been playing with OPA189 as the front end for some weighing instrumentation. I seem to be seeing a surprising amount of drift when the device is first switched on or if it is subject to a thermal shock; is this specified anywhere?

  • 0
    Guru 140200 points
    Hi John,

    have you some numbers?

    Kai
  • 0
    TI__Guru* 93105 points

    Hi John,

    When the OPA189 is first powered "on" the offset correction circuits and feedback loop take around 1 millisecond to null the offset and stabilize. But once this has been achieved the offset and voltage drift should be within their specified limits.

    OPA189 drift characterization was accomplished in thermal chambers which certainly isn't the same as a temperature shock test. Despite this the same internal offset and drift correction mechanisms should account and correct for the temperature changes, but there will be some time involved in making the corrections.

    If you have your circuit  and some drift information you can share we can review it and see if something unusual is occurring.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    TI__Genius 11135 points
    John

    We haven't heard back from you so we assume you were able to resolve your issue. If not just post another reply below.

    Thanks
    Dennis