参数资料
型号: ST72621L4M1
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, PDSO34
封装: 0.300 INCH, LEAD FREE, SHRINK, PLASTIC, SOP-34
文件页数: 25/139页
文件大小: 1264K
代理商: ST72621L4M1
120/139
Doc ID 6996 Rev 5
12.12 10-BIT ADC CHARACTERISTICS
Subject to general operating conditions for VDD, fCPU, and TA unless otherwise specified
Figure 81. RAIN max. vs fADC with CAIN=0pF
4)
Figure 82. Recommended CAIN/RAIN values
5)
Figure 83. Typical Application with ADC
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
Ω). 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). It is valid for all fADC frequencies ≤ 4MHz.
6. Please refer to Important Notes on conversion speed, Section 15.2 and also to Figure 92. on page 137 for details on
silicon revision identification.
Symbol
Parameter
Conditions
Min
Typ 1)
Max
Unit
fADC
ADC clock frequency
0.4
4
MHz
VAIN
Conversion voltage range 2)
VSSA
VDDA
V
RAIN
External input impedance
see
and
823)4)5)
k
Ω
CAIN
External capacitor on analog input
pF
fAIN
Variation frequency of analog input signal
Hz
CADC
Internal sample and hold capacitor
6
pF
tCONV
6)
Conversion time
Flash silicon rev. G devices
fADC=4MHz
4
μs
16
1/fADC
Conversion time
Flash silicon rev. X and ROM rev. Z devices
28
μs
112
1/fADC
0
5
10
15
20
25
30
35
40
45
010
30
70
CPARASITIC (pF)
Max.
R
AI
N
(Kohm)
4 MHz
2 MHz
1 MHz
0.1
1
10
100
1000
0.01
0.1
1
10
fAIN(KHz)
Max.
R
AI
N
(Kohm)
Cain 10 nF
Cain 22 nF
Cain 47 nF
AINx
ST72XXX
VDD
IL
±1
μA
VT
0.6V
VT
0.6V
CADC
6pF
VAIN
RAIN
10-Bit A/D
Conversion
2k
Ω(max)
CAIN
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