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OPA140: OPA140

Tom Gough
Prodigy 20 points
Part Number: OPA140
Other Parts Discussed in Thread: OPA188,

For a critical project, we need to know something about the long term Vos drift for this chip. IT there anything available?

  • 0
    TI__Guru* 93105 points
    Hello Tom,

    The closest information that we might be able to supply is the product qualification report. HTOL is often accomplished but it has a pass/fail criteria.

    Regards, Thomas
    Precision Amplifiers Applications Engineering
  • 0 in reply to Thomas Kuehl
    Prodigy 20 points
    Hello Thomas

    Can you estimate drift from the product qualification report or the HTOL (assuming it was done on this part). Or could you provide the product qualification report or at lease the relevant section that I assume Includes HTOL and we can try to muddle our way through. THe part we are using is OPA140AIDR and our operating range is 0 to 55 degC

    Thanks

    Tom
  • 0 in reply to Tom Gough
    Guru 47485 points

    Hey Tom,

    There is very little actual long term drift data out there on these kind of parts (seems the references do more of that). However, there is some data to suggest the chopper devices do really well - essentially your output long term drift is more set by external element shifts. Perhaps the OPA188 should be of interest to you here,

    www.ti.com/.../opa188.pdf

  • 0 in reply to Tom Gough
    TI__Guru* 93105 points

    Hi Tom,

    We certainly had to measure and collect the OPA140 offsets at each of the read-points and determine the deltas in relation to our established delta limits. The devices had to fall below the maximum delta criteria in order to pass and be qualified. TI does not share that detailed information with customers as it is designated company confidential.

    I can share with you a PowerPoint document that one of my colleagues prepared on the subject of  the long-term stability criteria we use here in the Precision Amplifiers group. I believe that will provide you some insight to our practices.

    Long-term stability_042619.pdf

    Regards, Thomas

    Precision Amplifiers Applications Engineering