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Input offset voltage for TLV2451

Paul Beijer
Intellectual 460 points
Other Parts Discussed in Thread: TLV2451

Hello,

I'm looking for a low power opamp with low input offset voltage. In the header of the TLV2451 datasheet an input offset voltage of 20uV typ. is mentioned. Further on in the specification (page 5) 300uV typ. is stated however.

Which number is correct?

Thank you,

Paul

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  • 0
    TI__Guru* 93105 points

    Hi Paul,

    The first page bullet listing a typical voltage offset of 20 uV is suspect. That is very low for an amplifier of this particular design. I looked over some TLV245x test data I had filed away. Although the mean VIO was not quite as high as 300 uV, it was closer to that than it was to 20 uV.

    Use the voltage offset numbers in the Electrical Specification tables. That is what TI assures (min/max), or has characterized (typical), regarding the product electrical performances.

    Regards, Thomas

    PA - Linear Applications Engineering

     

  • 0 in reply to Thomas Kuehl
    Intellectual 460 points

    Hi Thomas,

    Thanks for the reply. There are also some graphs in the datasheet that show input offset voltage vs. input common mode voltage. How should these be interpreted? I can't see any correlation between those graphs and the data in the specification tables.

    Thank you,

    Paul

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  • 0 in reply to Paul Beijer
    TI__Guru* 93105 points

    Hi Paul,

    The TLV2451 voltage offset VIO information published in the Electrical Characteristics table is based on a common-mode input voltage VIC, set half way between the two supply levels; 1/2 V+.

    Figures 1 and 2 in the TLV2451 data sheet shows how VIO changes as the VIC is moved from below 0 V, to a level approaching the applies V+ level. You will note that near the center of the scale the VIO is a low, arbitrary level. However, as the VIC level is moved above and below 1/2 V+ the offset shifts and follows the curve. The different levels are the result of what is going on in the amplifier's front-end as VIC transitions through different operating regions.

    The graphs provide a measure how much VIO will typically change relative to the mid-scale level as the entire VIC range is traversed.

    Regards, Thomas

    PA  - Linear Applications Engineering