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DAC121C085: Question about the full scale error

Alan Islas
Prodigy 60 points
Part Number: DAC121C085

Hi, 

I see that the full-scale error in the data sheet is -0.1 %FSR typical, and -0.7 %FSR maximum. 
This might be basic, but I'm confused by the negative sign. Does that mean the error will always be less than the "true value"?
Shouldn't it be a +/- error instead? Thanks in advance for the clarification. 

  • 0
    TI__Guru* 93445 points

    Alan,


    I don't normally support this device, but I did take a look at this question. This device was originally a National Semiconductor device, and the datasheet was translated over from the original format. In the original datasheet (or at least the one copied over from 2011), the columns are labeled as "Typical" and "Limits" which make only a little more sense to having negative values.

    From this datasheet, I would take it as 0.1% typical as the full-scale error and maximum of 0.7% maximum. This case would imply the ± nature of the specification. After that, I would use Figures 12 and 13 to show that the typical full-scale error is generally negative.


    Joseph Wu

  • 0 in reply to Joseph Wu
    Prodigy 60 points

    Hi Joseph, thanks for looking into this and for the guidance!

    Regards,
    Alan