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參數資料
| 型號： | MB90F804 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 16-bit Proprietary Microcontroller CMOS |
| 中文描述： | 16位微控制器專有的CMOS |
| 文件頁數： | 81/88頁 |
| 文件大?。?/td> | 385K |
| 代理商： | MB90F804 |
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MB90800 Series
81
<About the external impedance of analog input and its sampling time>
A/D converter with sample and hold circuit. If the extrernal impedance is too high to keep sufficient sampling
time, the analog voltage changed 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.
The relationship between external impedance and minimum sampling time
If the sampling time cannot be sufficient, connect a capacitor of about 0.1
μ
F to the analog input pin.
<About errors>
As | AV
CC
| becomes smaller, values of relative errors grow larger.
Analog input circuit model
R
C
Comparator
Analog input
R
C
MB90803
1.9 k
(Max) 32.3 pF (Max)
1.9 k
(Max) 25.0 pF (Max)
1.9 k
(Max) 32.3 pF (Max)
MB90F804
MB90V800
Note : The values are reference values.
During sampling : ON
100
90
80
70
60
50
40
30
20
10
0
0
5
→
Minimum sampling time [
μ
s]
10
15
20
25
30
35
MB90803/
MB90V800
MB90F804
20
18
16
14
12
10
8
6
4
2
0
0
1
2
3
4
5
7
8
MB90803/
MB90V800
MB90F804
6
[External impedance
=
0 k
to 100 k
]
[External impedance
=
0 k
to 20 k
]
→
Minimum sampling time [
μ
s]
→
]
→
]
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MB90F804-201PFR-GE1 | 制造商:FUJITSU 功能描述: |
| MB90F867APFR-G-SNE1 | 制造商:FUJITSU 功能描述: |
| MB90F867ASPF-GE1 | 制造商:FUJITSU 功能描述:IC 16BIT MCU I2C SMD QFP100 |
| MB90F867ASPFR-GE1 | 制造商:FUJITSU 功能描述: |
| MB90F867ASPFR-G-SPE1 | 制造商:FUJITSU 功能描述: |
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