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The TVCOS(input offset voltage average drift) of LM1642

Nick Dai
Expert 4240 points
Other Parts Discussed in Thread: LM6142

Hi Team,

   The datasheet only mentioned the Typ TVCOS of LM1642 is 3μV/°C,is there a Gaussian Distribution curve for the offset voltage drift?

   And could we understand as when temperature increase,the offset voltage will increase and when temperature decrease,the offset will decrease also?

Best Regards,

Nick Dai

  • 0
    TI__Mastermind 22825 points

    Hi Nick,

    Below is the distribution curve for the LM6142 offset voltage (x-axis is the offset voltage in mV) at 5V and also for 24V supply (all data at room temperature) measured for a very large sample size (3,950,467 units). The y-axis shows the relative frequency of occurrence (probability distribution):

    I think you are more interested in how offset shifts with temperature.

    Here is some LM6142 Vos (offset voltage) data at cold (CL1_LT, -40C plot) and hot (CL1_HT, +85C plot) at for 50 units (x-axis) at 24V supply voltage. As you can see, you cannot say that cold is lower than hot or vice versa (it could go either way):

    So, the temperature drift number can be positive or negative.

    The "A" grade (LM6142AIM) has lower offset limit than the "B" grade (LM6142BIM). So, if you are concerned about Vos (offset voltage), the "A" grade is the way to go. 

    Regards,

    Hooman