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ST72361AR4-Auto Datasheet(PDF) 253 Page - STMicroelectronics

Part # ST72361AR4-Auto
Description  Clock, reset and supply management
PDF  279 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72361AR4-Auto Datasheet(HTML) 253 Page - STMicroelectronics

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ST72361xx-Auto
Electrical characteristics
Doc ID 12468 Rev 3
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Figure 119. RAIN max vs fADC with CAIN = 0pF
1.
CPARASITIC represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus
the pad capacitance (3pF). A high CPARASITIC value will downgrade conversion accuracy. To remedy this,
fADC should be reduced.
2.
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.
Figure 120. Recommended CAIN/RAIN values
1.
Figure 143 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.
Figure 121. Typical application with ADC
1.
Data based on characterization results, not tested in production.
2.
When VDDA and VSSA pins are not available on the pinout, the ADC refers to VDD and VSS.
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
±1µA
VT
0.6V
VT
0.6V
CADC
6pF
VAIN
RAIN
10-Bit A/D
Conversion
2k
max
CAIN



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