ST STM32L15 QC Series Datasheet page 103

STM32L151xC/C-A STM32L152xC/C-A
Symbol Parameter
(5)
t Sampling time
S
Total conversion time
t
CONV
(including sampling time)
Internal sample and hold
C
ADC
capacitor
External trigger frequency
f
TRIG
Regular sequencer
External trigger frequency
f
TRIG
Injected sequencer
(6)
R Signal source impedance
AIN
Injection trigger conversion
t
lat
latency
Regular trigger conversion
t
latr
latency
t Power-up time
STAB
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 can be internally connected to V
REF+
Refer to Section 4: Pin descriptions
4. V or V must be tied to ground.
SSA REF-
5. Minimum sampling time is reached for an external input impedance limited to a value as defined in
source impedance R
AIN
6. External impedance has another high value limitation when using short sampling time as defined in
source impedance R
AIN
Table 55. ADC characteristics (continued)
2.4 V ≤ V
Multiplexed channels
2.4 V ≤ V
1.8 V ≤ V
Multiplexed channels
1.8 V ≤ V
Multiplexed channels
6/8/10-bit conversions
6/8/10-bit conversions
and V
DDA REF-
for further details.
max.
max.
Conditions
Direct channels
≤ 3.6 V
DDA
≤ 3.6 V
DDA
Direct channels
≤ 2.4 V
DDA
≤ 2.4 V
DDA
-
f = 16 MHz
ADC
-
Direct channels
12-bit conversions
12-bit conversions
-
f = 16 MHz
ADC
-
f = 16 MHz
ADC
-
-
can be internally connected to V
DS10262 Rev 8
Electrical characteristics
Min Typ
0.25 -
0.56 -
0.56 -
1 -
4 -
1 -
4 to 384 (sampling phase) +12
(successive approximation)
-
16
-
- - Tconv+1 1/f
- -
- - Tconv+2 1/f
- - Tconv+1 1/f
- -
219 -
3.5 -
156 -
2.5 -
- -
, depending on the package.
SSA
Table 57: Maximum
Table 57: Maximum
Max Unit
-
-
µs
-
-
384 1/f
ADC
24.75 µs
1/f
ADC
-
pF
-
ADC
Tconv 1/f
ADC
ADC
ADC
50 kΩ
281 ns
4.5 1/f
ADC
219 ns
3.5 1/f
ADC
3.5 µs
103/134
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