参数资料
型号: MB95F202KPF-G-SNE2
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, MICROCONTROLLER, PDSO20
封装: 7.50 X 12.70 MM, 2.65 MM HEIGHT, 1.27 MM PITCH, PLASTIC, SOP-20
文件页数: 49/72页
文件大小: 3340K
代理商: MB95F202KPF-G-SNE2
MB95200H/210H Series
DS07-12623-3E
53
(2) Notes on Using the A/D Converter
External impedance of analog input and its sampling time
The A/D converter has a sample and hold circuit. If the external impedance is too high to keep sufficient
sampling time, the analog voltage charged to the internal sample and hold capacitor is insufficient, adversely
affecting A/D conversion precision. Therefore, to satisfy the A/D conversion precision standard, considering
the relationship between the external impedance and minimum sampling time, either adjust the register value
and operating frequency or decrease the external impedance so that the sampling time is longer than the
minimum value. In addition, if sufficient sampling time cannot be secured, connect a capacitor of about 0.1 F
to the analog input pin.
A/D conversion error
As |VCC
VSS| decreases, the A/D conversion error increases proportionately.
Comparator
Analog input
During sampling: ON
Note: The values are reference values.
~
<
=
<
=
4.5 V
VCC
5.5 V : R
1.95 k
Ω (max), C 17 pF (max)
~
<
=
<
4.0 V
VCC
4.5 V : R
8.98 k
Ω (max), C 17 pF (max)
R
C
Analog input equivalent circuit
[External impedance = 0 k
Ω to 100 kΩ]
External
impedance
[k
Ω
]
External
impedance
[k
Ω
]
Minimum sampling time [
μs]
Minimum sampling time [
μs]
[External impedance = 0 k
Ω to 20 kΩ]
100
90
80
70
60
50
40
30
20
10
0
20
18
16
14
12
10
8
6
4
2
0
02468
10
12
14
1
02
3
4
(VCC >
= 4.5 V)
(VCC >
= 4.0 V)
(VCC >
= 4.5 V)
(VCC >
= 4.0 V)
Relationship between external impedance and minimum sampling time
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