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参数资料
| 型号： | MB90F823BPF |
| 厂商： | FUJITSU LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 14 X 20 MM, 3.35 HEIGHT, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 41/56页 |
| 文件大小： | 1645K |
| 代理商： | MB90F823BPF |
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MB90820B Series
46
DS07-13751-2E
7.
Notes on Using A/D Converter
About the external impedance of the analog input and its sampling time
A/D converter with 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, consider the relationship
between the external impedance and minimum sampling time and either adjust the resistor value and operating
frequency or decrease the external impedance so that the sampling time is longer than the minimum value.
And if the sampling time cannot be sufficient, connect a capacitor of about 0.1
F to the analog input pin.
About the error
The accuracy gets worse as
| AVRAVSS | becomes smaller.
R
C
RC
MB90822B/823B
2.0 k
(Max)
14.4 pF (Max)
MB90F822B/F823B
2.0 k
(Max)
16.0 pF (Max)
Analog input circuit model
Analog input
During sampling : ON
Comparator
Note : The values are reference values.
MB90F822B/F823B
MB90822B/
823B
0
5
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
90
100
MB90F822B/F823B
MB90822B/
823B
012345678
0
2
4
6
8
10
12
14
16
18
20
(External impedance
= 0 k to 100 k)
(External impedance
= 0 k to 20 k)
Ext
e
rn
al
imp
eda
nce
[
k
]
Minimum sampling time [
s]
Ext
e
rn
al
imp
eda
nce
[
k
]
Minimum sampling time [
s]
The relationship between the external impedance and minimum sampling time
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