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參數(shù)資料
| 型號(hào)： | MB89940 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 8-bit Proprietary Microcontrolle |
| 中文描述： | 8位專有Microcontrolle |
| 文件頁數(shù)： | 33/38頁 |
| 文件大小： | 197K |
| 代理商： | MB89940 |
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MB89940 Series
33
7.
Notes on Using A/D Converter
Input impedance of the analog input pins
The A/D converter used for the MB89940 series contains a sample hold circuit as illustrated below to fetch
analog input voltage into the sample hold capacitor for eight instruction cycles after activating A/D conversion.
For this reason, if the output impedance of the external circuit for the analog input is high, analog input voltage
might not stabilize within the analog input sampling period. Therefore, it is recommended to keep the output
impedance of the external circuit low (below 10 k
).
Note that if the impedance cannot be kept low, it is recommended to connect an external capacitor of about
0.1
μ
F for the analog input pin.
Error
The smaller the | AV
CC
– AV
SS
|, the greater the error would become relatively.
Analog Input Equivalent Circuit
Sample hold circuit
C .
Analog channel selector
Close for 8 instruction cycles after activating
A/D conversion.
If the analog input
impedance is higher
than 10 k
, it is
recommended to
connect an external
capacitor of approx.
0.1
μ
F.
Analog input pin
Comparator
R .
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MB89945 | 8-bit Proprietary Microcontrolle |
| MB89945PF | 8-bit Proprietary Microcontrolle |
| MB89943 | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125 |
| MB89943PF | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125 |
| MB8994x | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CFP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB89943 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89943PF | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89945 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontrolle |
| MB89945PF | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontrolle |
| MB8994X | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
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