Datasheet

STM8S207xx, STM8S208xx Electrical characteristics
Doc ID 14733 Rev 12 83/103
Table 45. ADC accuracy with R
AIN
< 10 kΩ , V
DDA
= 5 V
Symbol Parameter Conditions Typ Max
(1)
1. Data based on characterisation results for LQFP80 device with V
REF+
/V
REF-
, not tested in production.
Unit
|E
T
| Total unadjusted error
(2)
2. ADC accuracy vs. negative injection current: Injecting negative current on any of the analog input pins
should be avoided as this significantly reduces the accuracy of the conversion being performed on another
analog input. It is recommended to add a Schottky diode (pin to ground) to standard analog pins which may
potentially inject negative current. Any positive 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 2.5
LSB
f
ADC
= 4 MHz 1.4 3
f
ADC
= 6 MHz 1.6 3.5
|E
O
| Offset error
(2)
f
ADC
= 2 MHz 0.6 2
f
ADC
= 4 MHz 1.1 2.5
f
ADC
= 6 MHz 1.2 2.5
|E
G
| Gain error
(2)
f
ADC
= 2 MHz 0.2 2
f
ADC
= 4 MHz 0.6 2.5
f
ADC
= 6 MHz 0.8 2.5
|E
D
| Differential linearity error
(2)
f
ADC
= 2 MHz 0.7 1.5
f
ADC
= 4 MHz 0.7 1.5
f
ADC
= 6 MHz 0.8 1.5
|E
L
| Integral linearity error
(2)
f
ADC
= 2 MHz 0.6 1.5
f
ADC
= 4 MHz 0.6 1.5
f
ADC
= 6 MHz 0.6 1.5
Table 46. ADC accuracy with R
AIN
< 10 kΩ R
AIN
, V
DDA
= 3.3 V
Symbol Parameter Conditions Typ Max
(1)
Unit
|E
T
| Total unadjusted error
(2)
f
ADC
= 2 MHz 1.1 2
LSB
f
ADC
= 4 MHz 1.6 2.5
|E
O
| Offset error
(2)
f
ADC
= 2 MHz 0.7 1.5
f
ADC
= 4 MHz 1.3 2
|E
G
| Gain error
(2)
f
ADC
= 2 MHz 0.2 1.5
f
ADC
= 4 MHz 0.5 2
|E
D
| Differential linearity error
(2)
f
ADC
= 2 MHz 0.7 1
f
ADC
= 4 MHz 0.7 1
|E
L
| Integral linearity error
(2)
f
ADC
= 2 MHz 0.6 1.5
f
ADC
= 4 MHz 0.6 1.5