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.

INA597: TINA simulation for offset temperature drift

Part Number: INA597

Hi team,

My customer simulated the Vos temperature drift with TINA reference design as below. The Vos drift is 7.5uV/C which much higher than datasheet spec. Does it mean the TINA model is not very correct for this parameter?

Thanks.

  • Hi Jerry,

    the maximum input offset voltage drift for G=1/2 is +/-5µV/°C and for G=2 is +/-10µV/°C. As the model cannot see during the simulation which gain is used, the model assumes the worst case which is +/-10µV/°C, I guess.

    Kai

  • Hi Jerry,

    I checked with the INA697's model and it seems that the Vos vs. temperature slope is always 7.5uV/C regardless of temperature operating range. I think that the model engineer is placed a fixed temperature drift slope in the model., and the customer should go with the figures presented in the datasheet in this case. 

    From the Vos vs temperature plot below, it is difficult to model the temperature drift, which some parts of Vos increase vs. temperature and others decrease with increasing in temperature. The temperature drift figure of +/-5uV/C for G=1/2 is the worst case, and the modeled 7.5 uV/C is within the suggested distributed ranges in temperature drift.  

    If you have additional questions, please let me know. 

    Best,

    Raymond