Datasheet

Any positive injection current within the limits specified for I
INJ(PIN)
and ΣI
INJ(PIN)
in the I/O
port pin characteristics section does not affect the ADC accuracy.
Table 47: ADC accuracy with R
AIN
< 10 kΩ R
AIN
, V
DDA
= 3.3 V
UnitMax
(1)
TypConditionsParameterSymbol
LSB2.01.1f
ADC
= 2 MHzTotal unadjusted error
(2)
|E
T
|
2.51.6f
ADC
= 4 MHz
1.50.7f
ADC
= 2 MHzOffset error
(2)
|E
O
|
2.01.3f
ADC
= 4 MHz
1.50.2f
ADC
= 2 MHzGain error
(2)
|E
G
|
2.00.5f
ADC
= 4 MHz
1.00.7f
ADC
= 2 MHzDifferential linearity error
(2)
|E
D
|
1.00.7f
ADC
= 4 MHz
1.50.6f
ADC
= 2 MHzIntegral linearity error
(2)
|E
L
|
1.50.6f
ADC
= 4 MHz
(1)
Data based on characterisation results, not tested in production.
(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 I/O port
pin characteristics does not affect the ADC accuracy.
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STM8S105xxElectrical characteristics