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参数资料
| 型号： | MB89PV160-104-PF |
| 厂商： | FUJITSU LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 4.2 MHz, MICROCONTROLLER, CQFP80 |
| 封装： | CERAMIC, MQFP-80 |
| 文件页数： | 40/56页 |
| 文件大小： | 812K |
| 代理商： | MB89PV160-104-PF |
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MB89160L Series
45
(2) Precautions
Input impedance of analog input pins
The A/D converter 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
F for the analog input pin.
Error
The smaller the |AVR – AVSS
| is, the greater the error would become relatively.
Analog input pin
Sample hold circuit
C = 46 pF
If the analog input
impedance is higher
than 10 k
, it is
recommended to
connect an external
capacitor of approx.
0.1
F.
Comparator
R = 2.8 k
Analog channel selector
Close for 8 instruction cycles after
activating A/D conversion.
.
Analog Input Equivalent Circuit
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