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Vos Temperature drift, OPA2317

Simon Peacock
Prodigy 80 points

Other Parts Discussed in Thread: OPA2317, OPA2330

Hello Team,

We are currently using a LTC2055 for an application which is about to go to High Volume and would like to change it for a cheaper op-amp.  Vos drift with temperature is critical to our design since the circuit will calibrate out other parameters most of the time, but occasionally will rely on holding a set value for 24 hours over temperature.  The OPA2317 seems to meet our desired specs but there is no maximum dVos/dT.  We can't go above 0.587 uV over 0-70C range but would prefer 0.293 uV since that is 1/2 bit of our 16 bit DAC.

http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/t/199595.aspx

is a good start but it still needs to know the sigma to calculate the standard deviation.  Is there some way of finding this for the OPA2317?  We will be needing over a million of them by the time we are through.

Thanks

Simon

  • 0
    TI__Guru 73981 points

    Simon,

    Since OPA2317 typical drift spec of +/-0.05uV/C represents +/-1-sigma of normal Gaussian distribution, +/-0.587uV/C would represents +/-11-sigma thus the odds of ever seeing a units drift so much is close to zero - see Guassian statistics below.

    If you need to have the maximum drift assured, please consider using OPA2330 with similar specs as OPA2317 but specified maximum offset drift of 0.25uV/C.