• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 48 subscribers
  • Views 1785 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PGA280 Long Term Gain Drift

Wes Wirth
Intellectual 1080 points
Other Parts Discussed in Thread: PGA280

Hello,

I'm looking for data on the PGA280 related to long term GAIN drift.  The DS lists this for the offset but not for gain.

I see the gain error drift distribution graph but this is not quite what I'm looking for as it's not a 300hr life test similar to the testing done to get the 3.5nV/Month Vos drift number.

Any help is appreciated!

Regards,

wes.

Wes Wirth

Texas Instruments - Analog Field Applications - Redmond WA

 

  • 0
    TI__Prodigy 90 points

    Hi Wes,

    The long term gain drift of the PGA280 was on the order of the test capabilities.  1 unit had a larger (0.024%) gain drift over the equivalent 10yr operation.  All other units were statistically indistinguishable from the controls. 

    This would yield 2ppm/month worse case and <<1ppm/mo typical long term gain drift.  If you need more exact data please let me know.

    Best regards,

    Viola Schaffer

  • 0 in reply to Viola Schaffer
    Prodigy 70 points

    Hi Viola,

    Thank you for the answer (Wes asked the question on my behalf.)  Can you tell me how many units were tested wtih the 10 year equivalent aging?  I am just wondering what precentage of the total sample size the one outlying unit was.  It also would be helpful to know how linear the gain drift was over time; did most of the drift happen early in the aging process or was it relatively constant throughout the test?

    Best regards,

    Mike McFeters

  • 0 in reply to Mike McFeters
    TI__Prodigy 90 points

    Hi Mike,

    HTOL ran with 116 units at 150C for 300hrs.  We did have a preliminary HTOL on a previous revision (no change to resistors) on 16 additional units.  Due to logistical problems we only have pre and post stress reads for the 116 units.  We suspect that the outlier was an issue with the initial read but given that the shift was well below acceptable limits HTOL was not repeated. 

    Best regards,

    Viola