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STM32L151x6/8/B, STM32L152x6/8/B
Electrical characteristics
103
t
S
Sampling time
(5)
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
-
384
1/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
-
-
Tconv
1/f
ADC
f
TRIG
External trigger frequency
Injected sequencer
12-bit conversions
-
-
Tconv+2 1/f
ADC
6/8/10-bit conversions
-
-
Tconv+1 1/f
ADC
R
AIN
Signal source impedance
-
-
-
50
κΩ
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 V
REF+
input can be grounded iif neither the ADC nor the DAC are used (this allows to shut down an
external voltage reference).
2. The current consumption through V
REF
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 sa 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
for further details.
4. V
SSA
must be tied to ground.
5. See
for R
AIN
limitation.
Table 54. ADC characteristics (continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit