Datasheet

DocID14771 Rev 15 85/121
STM8S105x4/6 Electrical characteristics
90
10.3.11 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
DD
= 2.95 to 5.5 V 1 - 4
MHz
V
DD
= 4.5 to 5.5 V 1 - 6
V
DDA
Analog supply - 3.0 - 5.5
V
V
REF+
Positive reference voltage - 2.75
(1)
1. Data guaranteed by design, not tested in production.
-V
DDA
V
REF-
Negative reference voltage - V
SSA
-
0.5
(1)
V
AIN
Conversion voltage range
(2)
2. During the sample time, the sampling 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-
V
REF-
-
V
REF+
C
ADC
Internal sample and hold
capacitor
--3-pF
t
S
(2)
Minimum sampling time
f
ADC
= 4 MHz - 0.75 -
µs
f
ADC
= 6 MHz - 0.5 -
t
STAB
Wakeup time from standby - - 7.0 - µs
t
CONV
Minimum total conversion time
(including sampling time, 10-
bit resolution)
f
ADC
= 4 MHz 3.5 µs
f
ADC
= 6 MHz 2.33 µs
-141/f
ADC
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