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TPL0401A-10: TPL0401 Tolerance

Richard Haats
Prodigy 730 points
Part Number: TPL0401A-10

Hello,

What is the max. tolerance between the HW pins? The datasheets only lists ±20% Resistance Tolerance.

Thank you

Rich

  • 0
    TI__Guru 53793 points
    Hi Richard,

    I do not think I understand your question. Are you looking for an accuracy specification ?

    The PDS specifies that the Rtotal (end to end resistance of the dpot) can be a minimum of 8kΩ and a max of 12kΩ. The linearity of the potentiometer is specified as ±0.5LSB for INL and ±0.25 LSB for DNL.

    Does that answer your question?

    Thanks!
    Paul
  • 0 in reply to Paul_Frost
    TI__Guru 53793 points

    Hi Richard,

    I think it is better to think of the Rtotal error as a gain error, and INL as non-linearity.  You can think of the ideal transfer function as:

    Rwiper-to-low(code) = Rtotal(code/2^7)

    But applying Rtotal error as a gain error it becomes:

    Rwiper-to-low(code) = Rtotal x (100% +/-20%) x (code/2^7)

    Then you can apply the +/- INL error as well

    Rwiper-to-low(code) =  Rtotal x (100% +/-20%) x ((code +/- 0.5LSB) / 2^7)

    For example, the guaranteed max resistance from wiper to low for code 64 would be:

    Rw2lmax (64) = 10kΩ x 1.2 x (64 + 0x5) / 128

    Rw2lmax (64) = 6.047kΩ