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參數(shù)資料
| 型號： | MB91V230CR-ES |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-bit Microcontroller |
| 中文描述： | 32-BIT, MROM, 33.6 MHz, RISC MICROCONTROLLER, CPGA401 |
| 封裝： | CERAMIC, PGA-401 |
| 文件頁數(shù)： | 60/66頁 |
| 文件大?。?/td> | 861K |
| 代理商： | MB91V230CR-ES |
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MB91230 Series
60
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 sampling 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
μ
F to the analog input pin.
About errors
As |AVRH
AV
SS
| becomes smaller, values of relative errors grow larger.
Analog input circuit model
R
C
Comparator
During sampling : ON
Analog input
Note : The values are reference values.
R
C
MB91233L
0.18 k
(Max)
0.18 k
(Max)
0.18 k
(Max)
63.0 pF (Max)
MB91F233
39.0 pF (Max)
MB91F233L
39.0 pF (Max)
100
90
80
70
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
MB91F233
MB91F233L
MB91233L
(External impedance
=
0 k
to 100 k
)
Minimum sampling time (
μ
s)
E
)
20
18
16
14
12
10
8
6
4
2
0
0
1
Minimum sampling time (
μ
s)
2
3
4
5
6
8
7
MB91F233
MB91F233L
MB91233L
(External impedance
=
0 k
to 20 k
)
E
)
The relationship between the external impedance and minimum sampling time
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB91V245A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
| MB91V245ACR-ES | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
| MB91V265A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Proprietary Microcontrollers |
| MB91V265ACR-ES | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Proprietary Microcontrollers |
| MB91V280 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
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