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REF5040: THERMAL HYSTERESIS output range

Gary Zeng
Prodigy 370 points
Part Number: REF5040

Hi TI expert,

I now use the REF5040 reference and found a problem:

The device is calibrated at a constant temperature of 40°C, then shut down for one night, and then turned on the next day to keep the temperature at 40°C, and the voltage of the REF5040 becomes larger.

I also found the relevant content "THERMAL HYSTERESIS" thermal lag in the manual,the general meaning is that when the reference returns to the initial temperature from other temperatures, its output voltage cannot be fully restored and there will be a certain deviation. The manual only gives the formula but not the deviation range. I read the REF54xxx manual and it has a range.

What the thermal hysteresis range of the REF5040 is?

  • 0
    TI__Expert 5400 points

    Hello Gary,

    Gary Zeng said:
    The device is calibrated at a constant temperature of 40°C, then shut down for one night, and then turned on the next day to keep the temperature at 40°C, and the voltage of the REF5040 becomes larger.

    What is the total change in voltage you are seeing from this? What is the temperature when the device is shut down at night?

    Thermal hysteresis for REF50 is explained in section 9.3.3 as the following:

    The typical numbers are further explained in the electrical characteristics table of the REF50 datasheet:

    Thanks,

    Jackson

  • +1 in reply to Jackson Wightman
    TI__Expert 5400 points

    Hi Gary,

    Since I haven't heard back from you for a while, I am going to close this thread. If you have further questions, please respond to this message to re-open the thread.

    Thanks,

    Jackson