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參數(shù)資料
| 型號： | MB89F201-PSH |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 12.5 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | PLASTIC, SHDIP-32 |
| 文件頁數(shù)： | 25/39頁 |
| 文件大?。?/td> | 557K |
| 代理商： | MB89F201-PSH |
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MB89201 Series
31
(3) Notes on Using A/D Converter
Input impedance of the analog input pins
The A/D converter used for the MB89201 series contains a sample hold circuit as illustrated below to fetch
analog input voltage into the sample hold capacitor for 16 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 4 k
) .
Note that if the impedance cannot be kept low, it is recommended to connect an external capacitor of about
0.1
F for the analog input pin.
Error
The smaller the | VCC
AVSS |, the greater the error would become relatively.
R
Close for 16 instruction cycles after
activating A/D conversion
Analog channel selector
Sample hold circuit
Comparator
Analog input pin
C
If the analog input
impedance is higher than
4 k
, it is recommended to
connect an external
capacitor of approx. 0.1
F.
Analog Input Equivalent Circuit
MB89201/202 :
R
= approx. 2.2 k, C = approx. 45 pF
MB89N201/N202 :
R
= approx. 400 k, C = approx. 1.6 pF
MB89F201/F202 :
R = approx. 2.5 k
, C = approx. 10.7 pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB89F202 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-Bit Proprietary Microcontroller |
| MB89F202PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-Bit Proprietary Microcontroller |
| MB89F202P-SH | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-Bit Proprietary Microcontroller |
| MB89F202YPFV-ES | 制造商:FUJITSU 功能描述: |
| MB89F499 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller CMOS |
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