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TLC7226: Consultation on the definition of parameters

HUI XIE
Prodigy 40 points
Part Number: TLC7226

Tool/software:

In datasheets, what is the relationship between Total Unadjusted Error, Full-Scale Error, Linearity Error, RELATIVE ACCURACY, DIFFERENTIAL NONLINEARITY, OFFSET ERROR, and GAIN ERROR?

  • 0
    TI__Mastermind 42243 points

    Hello, 

    Total adjusted error when shown as a datasheet spec is a measured error that includes all device errors (INL, DNL, offset error, gain error). It does not include zero code error and full-scale error because those are endpoint only errors.

    I don't see relative accuracy in the datasheet for the TLC7226, but this is typically equivalent to Integral nonlinearity (INL) which is the term we use in newer datasheets. This is the cumulative contribution of DNL over the entire transfer function normalized to the endpoints of the transfer function. 

    Differential nonlinearity (DNL) is the difference in the actual code step from an ideal code step of 1. 

    Offset error is a positive or negative total shift in the transfer function (the 'b' term in y=mx+b).

    Gain error is an error in the slope of the transfer function (the 'm' term in y=mx+b). 

    Best,

    Katlynne Jones