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ST72561 bảng dữ liệu(PDF) 247 Page - STMicroelectronics

tên linh kiện ST72561
Giải thích chi tiết về linh kiện  8-BIT MCU WITH FLASH OR ROM, 10-BIT ADC, 5 TIMERS, SPI, LINSCI , ACTIVE CAN
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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ST72561 bảng dữ liệu(HTML) 247 Page - STMicroelectronics

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ADC CHARACTERISTICS (Cont’d)
Figure 144. RAIN max. vs fADC with CAIN=0pF
4)
Figure 145. Recommended CAIN/RAIN values
5)
Figure 146. 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 time and
reduced to allow the use of a larger serial resistor (RAIN). It is valid for all fADC frequencies ≤ 4MHz.
0
5
10
15
20
25
30
35
40
45
010
30
70
CPARASITIC (pF)
4 MHz
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
6pF
VAIN
RAIN
10-Bit A/D
Conversion
2k
Ω(max)
CAIN



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