STMicroelectronics STM32L151CB Manual page 85

STM32L151xx, STM32L152xx
Table 50.
Symbol
t
S
t
CONV
C
ADC
f
TRIG
f
TRIG
(6)
R
AIN
t
lat
t
latr
t
STAB
1. The Vref+ 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 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+
the package. Refer to
4. V or V
SSA
5. Minimum sampling and conversion time is reached for maximum Rext = 0.5 kΩ.
6. For 1 Msps, maximum Rext is 0.5 k
ADC characteristics (continued)
Parameter
Sampling time
Total conversion time
(including sampling time)
Internal sample and hold
capacitor
External trigger frequency
Regular sequencer
External trigger frequency
Injected sequencer
External input impedance
Injection trigger conversion
latency
Regular trigger conversion
latency
Power-up time
can be internally connected to V
Section 4: Pin descriptions
must be tied to ground.
REF-
Conditions
Direct channels
2.4 V ≤ V ≤ 3.6 V
DDA
Multiplexed channels
2.4 V ≤ V ≤ 3.6 V
DDA
Direct channels
1.8 V ≤ V ≤ 2.4 V
DDA
Multiplexed channels
1.8 V ≤ V ≤ 2.4 V
DDA
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.
Ω
.
Doc ID 17659 Rev 6
Electrical characteristics
Min Typ Max
(5)
0.25
(5)
0.56
(5)
0.56
(5)
1
4 384
1 24.75
4 to 384 (sampling
phase) +12 (successive
approximation)
16
Tconv+1 1/f
Tconv
Tconv+2 1/f
Tconv+1 1/f
50
0.5
219 281
3.5 4.5
156 219
2.5 3.5
3.5
, depending on
SSA
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
85/109