Datasheet

STM8AF52/62xx, STM8AF51/61xx Electrical characteristics
Doc ID 14395 Rev 9 83/110
Figure 43. ADC accuracy characteristics
1. Example of an actual transfer curve
2. The ideal transfer curve
3. End point correlation line
E
T
= Total unadjusted error: Maximum deviation between the actual and the ideal transfer curves.
E
O
= Offset error: Deviation between the first actual transition and the first ideal one.
E
G
= Gain error: Deviation between the last ideal transition and the last actual one.
E
D
= Differential linearity error: Maximum deviation between actual steps and the ideal one.
E
L
= Integral linearity error: Maximum deviation between any actual transition and the end point correlation
line.
Table 46. ADC accuracy for V
DDA
= 5 V
Symbol Parameter Conditions Typ Max
(1)
1. Max value is based on characterization, not tested in production.
Unit
|E
T
| Total unadjusted error
(2)
2. ADC accuracy vs. injection current: Any positive or negative injection current within the limits specified for
I
INJ(PIN)
and ΣI
INJ(PIN)
in Section 10.3.6 does not affect the ADC accuracy.
f
ADC
= 2 MHz
1.4 3
(3)
3. TUE 2LSB can be reached on specific salestypes on the whole temperature range.
LSB
|E
O
| Offset error
(2)
0.8 3
|E
G
| Gain error
(2)
0.1 2
|E
D
| Differential linearity error
(2)
0.9 1
|E
L
| Integral linearity error
(2)
0.7 1.5
|E
T
| Total unadjusted error
(2)
f
ADC
= 4 MHz
1.9
(4)
4. Target values.
4
(4)
|E
O
| Offset error
(2)
1.3
(4)
4
(4)
|E
G
| Gain error
(2)
0.6
(4)
3
(4)
|E
D
| Differential linearity error
(2)
1.5
(4)
2
(4)
|E
L
| Integral linearity error
(2)
1.2
(4)
1.5
(4)
E
O
E
G
1LSB
IDEAL
1LSB
IDEAL
V
DDA
V
SSA
–
1024
-----------------------------------------=
1023
1022
1021
5
4
3
2
1
0
7
6
1234567
1021102210231024
(1)
(2)
E
T
E
D
E
L
(3)
V
DDA
V
SSA