ST72F264G ST Microelectronics, ST72F264G Datasheet - Page 152

• Manufacturer Part Number: ST72F264G
• Description: (ST72F260G - ST72F264G) 8-BIT MCU
• Manufacturer: ST Microelectronics

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ST72260G, ST72262G, ST72264G
13.12 10-BIT ADC CHARACTERISTICS
T
Figure 105. R
Figure 107. Analog Input equivalent circuit
Notes:
1. Data based on design simulation.
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.
3. C
pacitance (3pF). A high C
4. This graph shows that depending on the input signal variation (f
decreased to allow the use of a larger serial resistor (R
152/171
Symbol
A
t
C
R
C
f
V
CONV
f
= -40°C to 85°C, unless otherwise specified
ADC
45
40
35
30
25
20
15
10
AIN
PARASITIC
ADC
5
0
AIN
AIN
AIN
4
U
.com
0
ADC clock frequency
Conversion voltage range
Internal sample and hold capacitor
Conversion time
External input impedance
External capacitor on analog input
Variation frequency of analog input
signal
V
AIN
represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad ca-
AIN
max. vs f
10
C
PARASITIC
R
Parameter
AIN
PARASITIC
(pF)
30
ADC
C
AIN
value will downgrade conversion accuracy. To remedy this, f
with C
4 MHz
2 MHz
1 MHz
AINx
70
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AIN
=0pF
f
ADC
3)
=4MHz
AIN)
Conditions
. It is valid for all f
V
DD
Figure 106. Recommended C
V
0.6V
V
0.6V
T
T
1000
AIN
100
0.1
10
1
), C
AIN
0.01
ADC
2k
can be increased for stabilization time and
I
±1 A
L
Min
0.4
V
frequencies
max
SS
1)
0.1
f
AIN
(KHz)
10-Bit A/D
Conversion
Typ
112
28
6
1
4MHz.
ADC
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AIN
Cain 10 nF
Cain 22 nF
Cain 47 nF
106
105
Figure
Figure
should be reduced.
Max
see
/R
V
4
2)3)4)
DD
and
10
AIN
ST72XXX
values
C
6pF
1/f
ADC
Unit
MHz
k
Hz
pF
pF
V
ADC
s
4U
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4U
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