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REF2030, REF1930, and REF3430 long term drift

ActalentScott
Prodigy 20 points
Part Number: REF2030
Other Parts Discussed in Thread: REF1930, REF3430

Hello,

I am considering REF2030, REF1930, and REF3430 for a new design for +100kHrs operation.  While there is datasheet specification of long term stability i.e. 60ppm for the first 1000 hours (40days).  What is the long(er) term drift specification for these components (ppm/sqrt(kHrs))?

Thank you,

Scott 

  • 0
    TI__Intellectual 1735 points

    Hello Scott,

    Long term stability for REF3430 changes from 25ppm to 10ppm after first 1000hrs to next 1000hrs to 2000hrs at 35C. So, you can consider this information which will gradually decrease fro your purpose.

    I hope it helps!

    -Tony

  • 0 in reply to Tony!
    Prodigy 20 points

    Hello Tony,

    Thank you for the reply.  So based on the REF3430 datasheet could I concretely say Typically, the stability is 25ppm of less for the first 1000 hours and 10ppm of less beyond that?

    Thank you,

    Scott

  • 0 in reply to ActalentScott
    TI__Intellectual 1735 points

    Hello Scott,

    I made a mistake in my last thread. It is 'increase' instead of 'decrease'.

    Long term stability of REF3430 is 25 ppm for first 1000hrs and changes and estimated value comes to 250ppm. Real time data for 100khr is too long. So, estimated value comes close to 250ppm.

    I hope it helps!

    -Tony

  • 0 in reply to Tony!
    Prodigy 20 points

    Hello Tony,

    Thank you very much for yourreply.  Could you explain how this was estimated and what the numbers would be for the REF2030, REF1930 too?  Is there any data or documentation you can share with me to backup your estimate?

    Thank you,


    Scott

  • 0 in reply to ActalentScott
    TI__Genius 16161 points

    Hello Scott,

    For our older devices such as REF1930 and REF2030 we only spec the LTD for the first 1000 hours which is 60ppm typical. Hope that answers your question. 

    Thanks.

  • 0 in reply to Masoud Beheshti61
    Prodigy 20 points

    Hello Masoud,

    Thank you for the reply. We are designing a product for a well established client that is intended to operate continuously for 20 years, with the requirement of precision accuracy and reliability. Over the life time of the product is expected to sell millions of units so component selection and reliability testing are key.  I am looking data or specification that will convey confidence that there is reasonable expectation that after many years of operation that the product will retain a good level of precision.  I realize that is not possible to have 20 years of data on this product, but some method of predicting a typical long term drift would be required to include these products in our selection process.  ie ppm/time (ppm/sqrt(khrs)) or other trendline data to predict where it will be at (typically) after several years of operation.

    Thank you,

    Scott

  • 0 in reply to ActalentScott
    TI__Genius 16161 points

    Hello Scott,

    Thanks for circling back.

    My recommendation would be to consider REF3430. This device has the lowest long term drift  as well best set of data in the datasheet. 

    Thanks.