ST ST10F276E - Total Unadjusted Error

Analog / digital converter UM0404
384/564 DocID13284 Rev 2
Gain error combined with offset error, represents the so-called full-scale error (Figure 164,
OFS + GE).
Quantization error
Quantization error is the intrinsic error of the A/D converter and is expressed as 1/2 LSB.
Non-linearity error
Non-Linearity error is the deviation between actual and the best-fitting A/D conversion
characteristics (see Figure 164):
• Differential Non-Linearity error is the actual step dimension versus the ideal one (1
LSB
IDEAL
).
• Integral Non-Linearity error is the distance between the center of the actual step and
the center of the bisector line, in the actual characteristics. Note that for Integral Non-
Linearity error, the effect of offset, gain and quantization errors is not included.
Note: Bisector characteristic is obtained drawing a line from 1/2 LSB before the first step of the
real characteristic, and 1/2 LSB after the last step again of the real characteristic.
19.5.1 Total unadjusted error
The Total Unadjusted Error specifies the maximum deviation from the ideal characteristic:
the number provided in the datasheet represents the maximum error with respect to the
entire characteristic. It is a combination of the Offset, Gain and Integral Linearity errors. The
different errors may compensate each other depending on the relative sign of the Offset and
Gain errors. Refer to Figure 164, see TUE.