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STM32F051K4 bảng dữ liệu(PDF) 76 Page - STMicroelectronics

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STM32F051x
Electrical characteristics
Doc ID 022265 Rev 3
77/105
6.3.15
12-bit ADC characteristics
Unless otherwise specified, the parameters given in Table 54 are preliminary values derived
from tests performed under ambient temperature, fPCLK2 frequency and VDDA supply voltage
conditions summarized in Table 20.
Note:
It is recommended to perform a calibration after each power-up.
Table 54.
ADC characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDDA
Analog supply voltage for
ADC ON
2.4
-
3.6
V
fADC
ADC clock frequency
0.6
-
14
MHz
fS
(1)
Sampling rate
0.05
-
1
MHz
fTRIG
(1)
External trigger frequency
fADC = 14 MHz
-
-
823
kHz
--
17
1/fADC
VAIN
Conversion voltage range
0
-
VDDA
V
RAIN
(1)
External input impedance
See Equation 1 and
Table 55 for details
--
50
k
Ω
RADC
(1)
Sampling switch resistance
-
-
1
k
Ω
CADC
(1)
Internal sample and hold
capacitor
--
8
pF
tCAL
(1)
Calibration time
fADC = 14 MHz
5.9
µs
83
1/fADC
tlatr
(1)
Trigger conversion latency
fADC = fPCLK/2 = 14 MHz
0.196
µs
fADC = fPCLK/2
5.5
1/fPCLK
fADC = fPCLK/4 = 12 MHz
0.219
µs
fADC = fPCLK/4
10.5
1/fPCLK
fADC = fHSI14 = 14 MHz
0.188
-
0.259
µs
JitterADC
ADC jitter on trigger
conversion
fADC = fHSI14
-1
-
1/fHSI14
tS
(1)
Sampling time
fADC = 14 MHz
0.107
-
17.1
µs
1.5
-
239.5
1/fADC
tSTAB
(1)
Power-up time
0
0
1
µs
tCONV
(1)
Total conversion time
(including sampling time)
fADC = 14 MHz
1
18
µs
14 to 252 (tS for sampling +12.5 for
successive approximation)
1/fADC
1.
Guaranteed by design, not tested in production.



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