Datasheet
Electrical characteristics STM32L15xCC STM32L15xRC STM32L15xUC STM32L15xVC
100/132 DocID022799 Rev 6
t
S
(5)
Sampling time
Direct channels
2.4 V V
DDA
3.6 V
0.25 - -
µs
Multiplexed channels
2.4 V V
DDA
3.6 V
0.56 - -
Direct channels
1.8 V V
DDA
2.4 V
0.56 - -
Multiplexed channels
1.8 V V
DDA
2.4 V
1- -
-4-3841/f
ADC
t
CONV
Total conversion time
(including sampling time)
f
ADC
= 16 MHz 1 - 24.75 µs
-
4 to 384 (sampling phase)
+12 (successive
approximation)
1/f
ADC
C
ADC
Internal sample and hold
capacitor
Direct channels -
16
-
pF
Multiplexed channels - -
f
TRIG
External trigger frequency
Regular sequencer
12-bit conversions - - Tconv+1 1/f
ADC
6/8/10-bit
conversions
--Tconv1/f
ADC
f
TRIG
External trigger frequency
Injected sequencer
12-bit conversions - - Tconv+2 1/f
ADC
6/8/10-bit
conversions
--Tconv+11/f
ADC
R
AIN
(6)
Signal source impedance - - 50 k
t
lat
Injection trigger conversion
latency
f
ADC
= 16 MHz 219 - 281 ns
- 3.5 - 4.5 1/f
ADC
t
latr
Regular trigger conversion
latency
f
ADC
= 16 MHz 156 - 219 ns
- 2.5 - 3.5 1/f
ADC
t
STAB
Power-up time - - - 3.5 µs
1. The Vref+ input can be grounded if neither the ADC nor the DAC are used (this allows to shut down an
external voltage reference).
2. The current consumption through VREF is composed of two parameters:
- one constant (max 300 µA)
- one variable (max 400 µA), only during sampling time + 2 first conversion pulses
So, peak consumption is 300+400 = 700 µA and average consumption is 300 + [(4 sampling + 2) /16] x 400
= 450 µA at 1Msps
3. V
REF+
can be internally connected to V
DDA
and V
REF-
can be internally connected to V
SSA
, depending on
the package. Refer to Section 4: Pin descriptions for further details.
4. V
SSA
or V
REF-
must be tied to ground.
5. Minimum sampling time is reached for an external input impedance limited to a value as defined in
Table 58: RAIN max for fADC = 16 MHz
6. External impedance has another high value limitation when using short sampling time as defined in
Table 58: RAIN max for fADC = 16 MHz
Table 56. ADC characteristics (continued)
Symbol Parameter Conditions Min Typ Max Unit