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參數(shù)資料
| 型號： | MB90F823PF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 0.80 MM, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 92/98頁 |
| 文件大?。?/td> | 1383K |
| 代理商： | MB90F823PF |
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MB90820 Series
92
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.
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.
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
MB90822
2.0 k
(Max)
14.4 pF (Max)
MB90F822
2.0 k
(Max)
16.0 pF (Max)
Analog input circuit model
Analog input
During sampling : ON
Comparator
Note : The values are reference values.
MB90F822
MB90822
0
5
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
90
100
MB90F822
MB90822
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)
External
impedance
[k
]
Minimum sampling time [
s]
External
impedance
[k
]
Minimum sampling time [
s]
The relationship between the external impedance and minimum sampling time
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