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参数资料
| 型号： | MB89P133APFM-201 |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 4.2 MHz, MICROCONTROLLER, PQFP48 |
| 封装： | PLASTIC, QFP-48 |
| 文件页数： | 39/54页 |
| 文件大小： | 537K |
| 代理商： | MB89P133APFM-201 |
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MB89130/130A Series
44
7.
Notes on Using A/D Converter
lnput impedance of the analog input pins
The A/D converter used for the MB89130/130A series contains a sample hold circuit as illustrated below to fetch
analog input voltage into the sample hold capacitor for eight instruction cycles after starting 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 approx.
0.1
F for the analog input pin.
Error
The smaller the | AVR
AVSS |, the greater the error would become relatively.
Sample hold circuit
Comparator
Analog input pin
C = 28 pF
.
R = 9 k
.
Close for 8 instruction cycles after starting
A/D conversion.
Analog channel selector
If the analog input
impedance is higher
than 10 k
, it is
recommended to
connect an external
capacitor of approx.
0.1
F.
Analog Input Equivalent Circuit
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相关代理商/技术参数 |
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| MB89P135 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
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