Datasheet

DS7147 Rev 10 83/103
STM8S003F3 STM8S003K3 Electrical characteristics
87
1. Data based on characterization results.
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 9.3.6 does not affect the ADC accuracy.
Table 47. ADC accuracy with R
AIN
< 10 kΩ R
AIN
, V
DD
= 3.3 V
Symbol Parameter Conditions Typ Max
(1)
1. Data based on characterization results.
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 9.3.6 does not affect the ADC accuracy.
f
ADC
= 2 MHz 1.6 3.5
LSB
f
ADC
= 4 MHz 1.9 4
|E
O
| Offset error
(2)
f
ADC
= 2 MHz 1 2.5
f
ADC
= 4 MHz 1.5 2.5
|E
G
| Gain error
(2)
f
ADC
= 2 MHz 1.3 3
f
ADC
= 4 MHz 2 3
|E
D
| Differential linearity error
(2)
f
ADC
= 2 MHz 0.7 1.0
f
ADC
= 4 MHz 0.7 1.5
|E
L
| Integral linearity error
(2)
f
ADC
= 2 MHz 0.6 1.5
f
ADC
= 4 MHz 0.8 2