STMicroelectronics STM32L151QCH6 Manual 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 RAIN max
6. External impedance has another high value limitation when using short sampling time as defined in
source impedance RAIN max
Table 55. ADC characteristics (continued)
Conditions
Direct channels
2.4 V ≤ V
Multiplexed channels
2.4 V ≤ V
Direct channels
1.8 V ≤ V
Multiplexed channels
1.8 V ≤ V
f = 16 MHz
ADC
Direct channels
Multiplexed channels
12-bit conversions
6/8/10-bit conversions
12-bit conversions
6/8/10-bit conversions
f = 16 MHz
ADC
f = 16 MHz
ADC
and V can be internally connected to V
DDA REF-
for further details.
DocID026119 Rev 5
Min
0.25
≤ 3.6 V
DDA
0.56
≤ 3.6 V
DDA
0.56
≤ 2.4 V
DDA
1
≤ 2.4 V
DDA
- 4
1
4 to 384 (sampling phase) +12
-
(successive approximation)
-
-
-
-
-
-
-
219
- 3.5
156
- 2.5
- -
SSA
Electrical characteristics
Typ Max
- -
- -
- -
- -
- 384
- 24.75
-
16
-
- Tconv+1 1/f
- Tconv
- Tconv+2 1/f
- Tconv+1 1/f
- 50
- 281
- 4.5
- 219
- 3.5
- 3.5
, depending on the package.
Table 57: Maximum
Table 57: Maximum
Unit
µs
1/f
ADC
µs
1/f
ADC
pF
ADC
1/f
ADC
ADC
ADC
kΩ
ns
1/f
ADC
ns
1/f
ADC
µs
103/133
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