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TLV9002: input offset voltage rating over the temperature

Lucas Pucheta
Intellectual 2478 points
Part Number: TLV9002

Hello,

I was looking into the input offset voltage rating over the temperature. So if I take the example of TLV9002, the datasheet says that on normal conditions max is +/- 1.6mV and over a temperature range, max is +/- 2mV.

The Vos vs Temperature value is given as +/- 0.6uV/C. So if I use this value to get max offset voltage at 125C, it will come out as 1.66mV(I am assuming that it will increase with temperature). So this calculated value and the given value are not matching and there is a significant difference.

 

Am I missing any point here to consider when calculating the offset voltage? Is it linear with temperature?

Best regards,

Lucas Pucheta: AFAE

  • 0
    Guru 244220 points

    The specified dVOS/dT value is typical; the worst-case value might be larger.

  • +1
    Guru 140200 points

    Hi Lucas,

    the maximum input offset voltage is +/-2mV. But keep in mind that this specification is only valid for a common mode input voltage of Vs / 2. Figure 7-4 of datasheet shows how the input offset voltage depends on the common mode input voltage.

    And figure 7-3 shows the input offset voltage versus temperature. Again, only for a common mode input voltage of Vs / 2.

    Kai

  • +1 in reply to kai klaas69
    TI__Mastermind 22591 points

    Hey Lucas,

    Clemens and Kai are correct. Since drift over temp is typical, the worst case may be a higher value. It's not necessarily linear though, and may either have a positive or negative slope or could fluctuate. The datasheet graphs attempt to give a sample of what behavior you may see, but may not detail all cases.

    Best,
    Jerry