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參數(shù)資料
| 型號： | MB89T855P-SH |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit Proprietary Microcontroller |
| 中文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDIP64 |
| 封裝： | SHRINK, PLASTIC, DIP-64 |
| 文件頁數(shù)： | 38/51頁 |
| 文件大?。?/td> | 731K |
| 代理商： | MB89T855P-SH |
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38
MB89860/850 Series
(2) Precautions
Input impedance of the analog input pins
The A/D converter used for the MB89860/850 series contains a sample hold circuit as illustrated below to
fetch analog input voltage into the sample hold capacitor for fifteen instruction cycles after activation 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 connot 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 | AVR – AV
SS
|, the greater the error would become relatively.
Anlog input pin
Analog channel selector
Sample hol.
C .
R ..
Close for 15 instruction cycles
after activating A/D conversion.
Comparator
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 Equivalent Circuit
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