ST72F324BK6TAS STMicroelectronics, ST72F324BK6TAS Datasheet - Page 172

• Manufacturer Part Number: ST72F324BK6TAS
• Description: 8-BIT MCU
• Manufacturer: STMicroelectronics

Electrical characteristics
Table 111. 10-bit ADC characteristics (continued)
1. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10k). Data
2. Injecting negative current on adjacent pins may result in increased leakage currents. Software filtering of the converted
172/198
Symbol
t
ADC
based on characterization results, not tested in production.
analog value is recommended.
Conversion time (Sample + Hold)
f
f
No. of sample capacitor loading cycles
No. of Hold conversion cycles
CPU
ADC
Figure 82. R
1. C
Figure 83. Recommended C
1. This graph shows that, depending on the input signal variation (f
Figure 84. Typical A/D converter application
= 8 MHz, Speed = 0,
= 2 MHz
the pad capacitance (3pF). A high C
f
stabilization time and decreased to allow the use of a larger serial resistor (R
ADC
PARASITIC
should be reduced.
Parameter
V
AIN
represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus
AIN
R
max. vs f
AIN
C
AIN
ADC
AINx
Doc ID13466 Rev 4
AIN
45
40
35
30
25
20
15
10
1000
5
0
100
PARASITIC
0.1
with C
10
1
and R
0
0.01
Conditions
AIN
value will downgrade conversion accuracy. To remedy this,
AIN
V
= 0pF
DD
10
C
0.1
PARASITIC
values
V
0.6V
V
0.6V
f
AIN
T
T
(KHz)
(1)
(pF)
30
1
(1)
2kmax
Cain 10 nF
Cain 22 nF
Cain 47 nF
AIN
I
2 MHz
1 MHz
lkg
), C
70
10
Min
AIN
can be increased for
10-bit A/D
conversion
AIN)
Typ
.
7.5
11
4
ST72XXX
ST72324B-Auto
Max
C
12pF
ADC
1/f
Unit
µs
ADC