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参数资料
型号： ST72F324K2B6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装： 0.400 INCH, PLASTIC, SDIP-32
文件页数： 48/156页
文件大小： 1027K
代理商： ST72F324K2B6
ST72324J/K
141/156
12.12 10-BIT ADC CHARACTERISTICS
Subject to general operating conditions for VDD,fCPU, and TA unless otherwise specified.
Figure 93. RAIN max. vs fADC with CAIN=0pF
4)
Figure 94. Recommended CAIN &RAIN values.
5)
Figure 95. Typical A/D Converter Application
Notes:
1. Unless otherwise specified, typical data are based on TA=25°C and VDD-VSS=5V. They are given only as design guide-
lines and are not tested.
2. When VDDA and VSSA pins are not available on the pinout, the ADC refers to VDD and VSS.
3. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10k
). Data
based on characterization results, not tested in production.
4. CPARASITIC represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad ca-
pacitance (3pF). A high CPARASITIC value will downgrade conversion accuracy. To remedy this, fADC should be reduced.
5. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization and to allow
the use of a larger serial resistor (RAIN).
Symbol
Parameter
Condition s
Min
Typ 1)
Max
Unit
fADC
ADC clock frequency
0.4
2
MHz
VAREF
Analog reference voltage 2)
0.7*VDD
5.5
V
VAIN
Conversion voltage range 3)
VSSA
VAREF
IL
Input leakage current
for analog input
-40
°C≤T
A≤85°C range
±250
nA
Other TA ranges
±1
A
RAIN
External input impedance
see
Figure 93
and
Figure
943)4)5)
k
CAIN
External capacitor on analog input
pF
fAIN
Variation freq. of analog input signal
Hz
CADC
Internal sample and hold capacitor
12
pF
tSTAB
Stabilization time after ADC enable
fCPU=8MHz, SPEED=0
fADC=2MHz
0 5)
s
tADC
Conversion time (Sample+Hold)
7.5
- No of sample capacitor loading cycles
- No. of Hold conversion cycles
4
11
1/fADC
0
5
10
15
20
25
30
35
40
45
0
103070
CPARASITIC (pF)
Max.
R
AIN
(Kohm)
2MHz
1MHz
0.1
1
10
100
1000
0.01
0.1
1
10
fAIN(KHz)
Max.
R
AIN
(Kohm)
Cain 10 nF
Cain 22 nF
Cain 47 nF
AINx
ST72XXX
VDD
IL
±1A
VT
0.6V
VT
0.6V
CADC
6pF
VAIN
RAIN
10-Bit A/D
Conversion
2k
(max)
CAIN
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