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ST72F262G2B6 Datasheet(PDF) 157 Page - STMicroelectronics

Part # ST72F262G2B6
Description  8-BIT MCU WITH FLASH OR ROM MEMORY, ADC, TWO 16-BIT TIMERS, I2C, SPI, SCI INTERFACES
PDF  172 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72F262G2B6 Datasheet(HTML) 157 Page - STMicroelectronics

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13.12 10-BIT ADC CHARACTERISTICS
VDD= 2.7 to 5.5V, TA = -40°C to 85°C, unless otherwise specified
Figure 97. RAIN max. vs fADC with CAIN=0pF
2)
Figure 98. Recommended CAIN/RAIN values
3)
Figure 99. Analog Input equivalent circuit
Notes:
1. 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.
2. 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.
3. 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). It is valid for all fADC frequencies ≤ 4MHz.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fADC
ADC clock frequency
0.5
4MHz
VAIN
Conversion voltage range
VSS
VDD
V
CADC
Internal sample and hold capacitor
6
pF
tCONV
Conversion time
FLASH, fADC=4MHz
28
µs
112
1/fADC
ROM, fADC=4MHz
3.5
µs
14
1/fADC
RAIN
External input impedance
see
Figure 97
and
Figure
981)2)3)
k
Ω
CAIN
External capacitor on analog input
pF
fAIN
Variation frequency of analog input
signal
Hz
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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