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OPA2241's offset voltage specifications.

Tsuguhiko Asai
Expert 1260 points
Other Parts Discussed in Thread: OPA2241

Dear All,

Would you tell the details about the offset voltage of OPA2241?
There is the Typ spec to the data sheet.
0.4μV/ ℃

1. Would you tell us this Max spec?

2. (If you cannot answer a question1)
There is indication to the graph of the data sheet to "1.3μV/ ℃ ".
"TYPICAL PERFORMANCE CURVES"
May I regard this as MAX specifications?

3. (If you cannot answer a question1 and 2)
Would you tell us the Σ value of these specifications?

It is necessary for our customer to know these specifications
or Σ value to decide the specifications of their system.

Best Regards
Tsuguhiko Asai

  • 0
    TI__Genius 12631 points

    Hello Tsugishiko san,

      Typically we spec our drift maximums to a 6sigma distribution. So with a 6sigma distribution to a typical 0.4uV/C spec., this would put the max. drift at 2.4uV/C. This is quite an old part so I will ask around and check if we can provide more info to confirm my numbers.

    Thanks

    Samir

      

  • 0
    TI__Guru 60570 points

    Tsuguhiko,

    There can be no absolute maximum drift limit for OPA2241 because it is not being tested in production.  However, the drift has been characterized during initial introduction of the product and its typical number represents one standard deviation (1-sigma).  See my answered below:

    1. Would you tell us this Max spec?

    If you assume 4-sigma max drift of +/-1.6uV/C, 1 out of 15,000 units will not meet such spec

    If you assume 5-sigma max drift of +/-2.0uV/C, 1 out of 1,700,000 units will not meet such spec

    etc.

     

    2. (If you cannot answer a question1)
    There is indication to the graph of the data sheet to "1.3μV/ ℃ ".
    "TYPICAL PERFORMANCE CURVES"
    May I regard this as MAX specifications?

    No, you may not regard the tail of the drift distribution as max drift since this typically represents ~3-sigma number.

    3. (If you cannot answer a question1 and 2)
    Would you tell us the Σ value of these specifications?

    Typical drift represents 1-sigma value.