st10f272z2 STMicroelectronics, st10f272z2 Datasheet - Page 149

• Manufacturer Part Number: st10f272z2
• Description: 16-bit Mcu With 256 Kbyte Flash Memory And 20 Kbyte Ram
• Manufacturer: STMicroelectronics

ST10F272Z2
Note:
25.7.3
Non-linearity error
Non-Linearity error is the deviation between actual and the best-fitting A/D conversion
characteristics (see
●
●
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.
Total unadjusted error
The Total Unadjusted Error specifies the maximum deviation from the ideal characteristic:
the number provided in the Data Sheet 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 42. A/D conversion characteristic
Digital
Out
(HEX)
Differential Non-Linearity error is the actual step dimension versus the ideal one (1
LSB
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.
Offset Error OFS
3FE
3FD
3FC
3FB
3FA
3FF
007
006
005
004
003
002
001
000
IDEAL
1
).
2
Figure
3
Figure
Ideal Characteristic
4
1 LSB (ideal)
42):
5
42, see TUE.
(7)
6
V
[LSB
AIN
(4)
(3)
IDEAL
7
(LSB
(2)
(5)
IDEAL
= V
AREF
)
1018
/ 1024]
(6)
1020
(1)
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) Differential Non-Linearity Error (DNL)
(4) Integral Non-Linearity Error (INL)
(5) Center of a step of the actual transfer curve
(6) Quantization Error (1/2 LSB)
(7) Total Unadjusted Error (TUE)
Offset Error OFS
1022
Electrical characteristics
1024
Bisector Characteristic
Gain Error GE
149/189