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參數(shù)資料
| 型號： | MB90F822APF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-bit Proprietary Microcontroller |
| 中文描述： | 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 94/100頁 |
| 文件大?。?/td> | 992K |
| 代理商： | MB90F822APF |
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MB90820 Series
94
7.
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 mF to the analog input pin.
Notes on Using A/D Converter
About the error
The accuracy gets worse as
|
AVR
AV
SS
|
becomes smaller.
R
C
R
C
MB90822/823
MB90F822A/F823A
2.0 k
(Max)
2.0 k
(Max)
14.4 pF (Max)
16.0 pF (Max)
Analog input circuit model
Analog input
During sampling : ON
Comparator
Note : The values are reference values.
MB90F822A/F823A
MB90822/
823
0
5
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
90
100
MB90F822A/F823A
MB90822/
823
0
1
2
3
4
5
6
7
8
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
)
E
]
Minimum sampling time [
μ
s]
E
]
Minimum sampling time [
μ
s]
The relationship between the external impedance and minimum sampling time
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