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ST7232A データシート(PDF) 136 Page - STMicroelectronics

部品番号 ST7232A
部品情報  8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFACE
PDF  154 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7232A データシート(HTML) 136 Page - STMicroelectronics

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ADC CHARACTERISTICS (Cont’d)
Figure 78. RAIN max. vs fADC with CAIN=0pF
1)
Figure 79. Recommended CAIN & RAIN values.
2)
Figure 80. Typical A/D Converter Application
Notes:
1. 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.
2. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization time and
decreased to allow the use of a larger serial resistor (RAIN).
0
5
10
15
20
25
30
35
40
45
010
30
70
CPARASITIC (pF)
2 MHz
1 MHz
0.1
1
10
100
1000
0.01
0.1
1
10
fAIN(KHz)
Cain 10 nF
Cain 22 nF
Cain 47 nF
AINx
ST72XXX
VDD
IL
±1
µA
VT
0.6V
VT
0.6V
CADC
12pF
VAIN
RAIN
10-Bit A/D
Conversion
2k
Ω(max)
CAIN
1



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