Datasheet

Electrical characteristics STM8S207xx, STM8S208xx
82/103 Doc ID 14733 Rev 12
10.3.10 10-bit ADC characteristics
Subject to general operating conditions for V
DDA
, f
MASTER
, and T
A
unless otherwise
specified.
Table 44. ADC characteristics
Symbol Parameter Conditions Min Typ Max Unit
f
ADC
ADC clock frequency
V
DDA
= 3 to 5.5 V 1 4
MHz
V
DDA
= 4.5 to 5.5 V 1 6
V
DDA
Analog supply 3 5.5 V
V
REF+
Positive reference voltage 2.75
(1)
1. Data guaranteed by design, not tested in production..
V
DDA
V
V
REF-
Negative reference voltage V
SSA
0.5
(1)
V
V
AIN
Conversion voltage range
(2)
2. During the sample time the input capacitance C
AIN
(3 pF max) can be charged/discharged by the external
source. The internal resistance of the analog source must allow the capacitance to reach its final voltage
level within t
S.
After the end of the sample time t
S
, changes of the analog input voltage have no effect on
the conversion result. Values for the sample clock t
S
depend on programming.
V
SSA
V
DDA
V
Devices with external
V
REF+
/V
REF-
pins
V
REF-
V
REF+
V
C
ADC
Internal sample and hold
capacitor
3pF
t
S
(2)
Sampling time
f
ADC
= 4 MHz 0.75
µs
f
ADC
= 6 MHz 0.5
t
STAB
Wakeup time from standby 7 µs
t
CONV
Total conversion time (including
sampling time, 10-bit resolution)
f
ADC
= 4 MHz 3.5 µs
f
ADC
= 6 MHz 2.33 µs
14 1/f
ADC