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TLV1702 long stability of VOS and IOS

K.Hamamoto
Guru 12155 points


Hi

I have a question about long stability of Ios and Vos.

I have referred the following information.

https://e2e.ti.com/blogs_/b/precisionhub/archive/2014/02/20/ic-long-term-stability-the-only-constant-is-change

 

It is mentioned that the long stability of some parameter(like VOS , VOS drift ) can be estimated by+/-100% of typ value.

So that, how can we estimate the long stability of VOS and VOS drift and IOS?

 

Can we estimate the Ios by +100%?

Also , is there any direction of long stability (it means increasing or decreasing)?

Regards,

Koji Hamamoto

  • 0
    TI__Guru* 93105 points

    Hamamoto-san,

    According to the blog:

    • Specifications centered around zero or a mean value (like Vos, Vos Drift, Vref, AOL, CMRR, PSRR, etc.) may shift over 10-year life up to:

                                 +/-100% of the max (min) PDS specified value


    Therefore, that would indicated that Vos, dVos/dT and Ios could increase by 100 % across that 10-year timespan. Vos and dVos/dT both have a maximum specified which makes determining the numbers straightforward. The Ios is a typical value, which is most often a one-sigma number for our PA op amps and comparators. Thus, mulitply the Ios number by 4, or 5x, for a 4, or 5, sigma maximum. Then, use that as the +/- 100 % ten-year number for Ios. That should work for an estimate.

    The movement of these parameters can be up, or down and there is no way of knowing beforehand which way they will move over time.

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Guru 12155 points
    Hi Thomas,

    Thank you very much for your quick reply.

    I would like to make sure about your answer.

    Vos, dVos/dT which has maximum value.
    The long stability (10 years) ; +/- 100% of Max value.

    Ios which has only mean value,
    The long stability (10 years) ; x4 or x5 of mean value.

    Is that correct?

    I understand we have no way to know the movement of these parameter can be up or down.

    Regards,
    Koji Hamamoto
  • 0 in reply to K.Hamamoto
    TI__Guru* 93105 points

    Hamamoto-san,

    Sorry for the delay; I have been traveling much of the day. I do think I need to make one small correction. The line in my previous response should have stated, "Therefore, that would indicated that Vos, dVos/dT and Ios could change by as much as +/-100 % across that 10-year timespan."

    Regarding your questions:

    Vos, dVos/dT which has maximum value.
    The long stability (10 years) ; +/- 100% of Max value. - yes

    Ios which has only mean value,
    The long stability (10 years) ; x4 or x5 of mean value. - no, Ios is listed in the Electrical Caracteristics tables as a "typical" value, which as I stated is the one standard deviation value - not the mean. Do not confuse this with the "mean" value which is the average value. So the 4x, or 5x, value is 4x, or 5x, the one standard deviation value realted to a normal distribution (see Marek's blog for explanation).

    Regards, Thomas

    PA - Linear Applications Engineering