DAC80501: Accuracy calculation

Hi Josel,

Please review this TI Precision Labs video that discusses how to calculate the total unadjusted error (TUE) for a DAC: https://training.ti.com/ti-precision-labs-dacs-precision-dac-calibration?context=1139747-1140267-1140260-1140263-1140264.

This is a conservative way to combine the DAC errors listed in the datasheet. Also keep in mind reference error will also factor into this. If you are using an external reference you will need to incorporate the error of that reference. 

The datasheet does give a measured TUE value under the listed conditions:

There are also a few TUE plots in the typical characteristics section. 

Best,

Katlynne Jones 

Hi Josel,

That would be the Zero code error temperature coefficient and Gain error temperature coefficient. Here is a screenshot from the DAC11001A datasheet. You can see that the temperature drift is given in ppm FSR/C:

The DAC80501 gives the zero code error drift in uV/C and the gain error drift in ppm FSR/C. Make sure you translate everything into the same units before summing the errors. 

Best,

Katlynne Jones 

Hi Josel,

Here is their explanation:

Gain error drift spec is ±0.04ppm FSR/degC

FSR   = 10V, so drift  = ±0.4 ppm/C

Operating temperature range = -40 to +125 C

Drift Error in ppm = ±0.4 ppm/C x Max operating temperature range , where

Max Operating temp range  =  Max { abs [T high - 25 ] , abs [ Tlow – 25 ] }, assuming calibration is performed only at 25 C

So Max operating temp range  =  Max [ abs(125-25) , abs (-40-25) ]  =  Max [ 100, 65] = 100 C

Gain error drift in ppm  = ±0.4 x 100 = 40 ppm

Best,

Katlynne Jones