Electrical characteristics
STM8S207xx, STM8S208xx
Table 45. ADC accuracy with R
< 10 kΩ , V
= 5 V
DDA
AIN
Symbol
Parameter
Conditions
Typ
Max(1)
Unit
fADC = 2 MHz.
fADC = 4 MHz.
fADC = 6 MHz.
fADC = 2 MHz.
fADC = 4 MHz.
fADC = 6 MHz.
fADC = 2 MHz.
fADC = 4 MHz.
fADC = 6 MHz.
fADC = 2 MHz.
fADC = 4 MHz.
1
2.5
3
|ET|
Total unadjusted error (2)
1.4
1.6
0.6
1.1
1.2
0.2
0.6
0.8
0.7
0.7
0.8
0.6
0.6
0.6
3.5
2
|EO|
|EG|
|ED|
|EL|
Offset error (2)
Gain error (2)
2.5
2.5
2
2.5
2.5
1.5
1.5
1.5
1.5
1.5
1.5
LSB
Differential linearity error (2)
Integral linearity error (2)
f
ADC = 6 MHz.
fADC = 2 MHz.
fADC = 4 MHz.
f
ADC = 6 MHz.
1. Data based on characterisation results for LQFP80 device with VREF+/VREF-, 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 IINJ(PIN) and
ΣIINJ(PIN) in Section 10.3.6 does not affect the ADC accuracy.
Table 46. ADC accuracy with R
< 10 kΩ R , V
= 3.3 V
DDA
AIN
AIN
Symbol
Parameter
Conditions
Typ
Max(1)
Unit
fADC = 2 MHz.
fADC = 4 MHz.
fADC = 2 MHz.
1.1
1.6
0.7
1.3
0.2
0.5
0.7
0.7
0.6
0.6
2
2.5
1.5
2
|ET|
Total unadjusted error(2)
|EO|
|EG|
|ED|
|EL|
Offset error(2)
Gain error(2)
f
ADC = 4 MHz.
fADC = 2 MHz.
fADC = 4 MHz.
fADC = 2 MHz.
fADC = 4 MHz.
fADC = 2 MHz.
1.5
2
LSB
1
Differential linearity error(2)
Integral linearity error(2)
1
1.5
1.5
f
ADC = 4 MHz.
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Doc ID 14733 Rev 9
STMICROELECTRONICS [ ST ]
