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REF5045: Thermal hysteresis.

Kengo.Y
Guru 10385 points
Part Number: REF5045

Hi team,

I'd like to know about the thermal hysteresis.

1: Is the thermal hysteresis value accumulated on a cycle-by-cycle basis?
　Or will it be reset somewhere?
    70ppm(Cycle1) + 50ppm(Cycle2) = 120ppm(Typ)
    
2: Could you tell me why characteristics the thermal hysteresis occurs in the IC?

Sincerely.
Kengo.

  • +1
    TI__Intellectual 1735 points

    Hi Kengo,

    1. Thermal hysteresis doesn't necessarily reset, nor does it necessarily drift in one direction. Instead, it kind of "wanders" around, but the more you cycle the part, the more "stable" the hysteresis will be. Exactly what stable is and how much that would be for a given product is not known. It would require extensive characterization.

    2. As I understand it, thermal hysteresis is due to mechanical and materials properties. Check out https://www.ti.com/lit/wp/slpy003a/slpy003a.pdf on page 6 for details.

    -Tony

  • 0 in reply to Tony!
    Guru 10385 points

    Hi Tony,

    Thank you so much for your answer.

    Do you have more than 2 cycles of thermal hysteresis data?

    Could you tell me the reason why the datasheet only mentions 2 cycles?

    Sincerely.
    Kengo.

  • +1 in reply to Kengo.Y
    TI__Intellectual 1735 points

    Hi Kengo,

    Sorry, we don't have data that we can share on that. The datasheet only shows 2 cycles since those are the majority contributors and the hysteresis goes down over time, and at a certain point the data gets muddled with long term drift.

    If you need this data, it would be advisable to get some samples and run the tests - that way you can get data that is more representative of your conditions.

    -Tony