Datasheet

Electrical characteristics STM32L431xx
132/200 DocID028800 Rev 1
6.3.17 Analog-to-Digital converter characteristics
Unless otherwise specified, the parameters given in Table 64 are preliminary values derived
from tests performed under ambient temperature, f
PCLK
frequency and V
DDA
supply voltage
conditions summarized in
Table 21: General operating conditions.
Note: It is recommended to perform a calibration after each power-up.
Table 64. ADC characteristics
(1) (2)
Symbol Parameter Conditions Min Typ Max Unit
V
DDA
Analog supply voltage - 1.62 - 3.6 V
V
REF+
Positive reference voltage
V
DDA
 2 V 2 - V
DDA
V
V
DDA
< 2 V V
DDA
V
V
REF-
Negative reference
voltage
-V
SSA
V
f
ADC
ADC clock frequency
Range 1 - - 80
MHz
Range 2 - - 26
f
s
Sampling rate for FAST
channels
Resolution = 12 bits - - 5.33
Msps
Resolution = 10 bits - - 6.15
Resolution = 8 bits - - 7.27
Resolution = 6 bits - - 8.88
Sampling rate for SLOW
channels
Resolution = 12 bits - - 4.21
Resolution = 10 bits - - 4.71
Resolution = 8 bits - - 5.33
Resolution = 6 bits - - 6.15
f
TRIG
External trigger frequency
f
ADC
= 80 MHz
Resolution = 12 bits
- - 5.33 MHz
Resolution = 12 bits - - 15 1/f
ADC
V
CMIN
Input common mode
Differential mode
(V
REF+
+
V
REF-
)/2
- 0.18
(V
REF+
+
V
REF-
)/2
(V
REF+
+
V
REF-
)/2
+ 0.18
V
V
AIN
(3)
Conversion voltage
range(2)
-0-V
REF+
V
R
AIN
External input impedance - - - 50 k
C
ADC
Internal sample and hold
capacitor
--5-pF
t
STAB
Power-up time - 1
conversion
cycle
t
CAL
Calibration time
f
ADC
= 80 MHz 1.45 µs
-1161/f
ADC
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