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参数资料
| 型号： | MB89475P-SH |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 12.5 MHz, MICROCONTROLLER, PDIP48 |
| 封装： | PLASTIC, SDIP-48 |
| 文件页数： | 29/46页 |
| 文件大小： | 999K |
| 代理商： | MB89475P-SH |
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35
MB89470 Series
(3) Notes on Using A/D Converter
Input impedance of the analog input pins
The A/D converter used for the MB89470 series contains a sample hold circuit as illustrated below to fetch
analog input voltage into the sample hold capacitor for 16 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
.
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|, the greater the error would become relatively.
MB89475
MB89PV470
MB89P475
R: analog input equivalent resistance
2.2 k
2.6 k
C: analog input equivalent capacitance
45 pF
28 pF
Analog input pin
Sample hold circuit
If the analog input
impedance is too low,
it is recommended to
connect an external
capacitor of approx.
0.1
F.
Comparator
R
C
Analog channel selector
Close for 16 instruction cycles after
activating A/D conversion.
Analog Input Circuit Model
相关PDF资料 |
PDF描述 |
|---|---|
| MB89P475PFV-202 | 8-BIT, 12.5 MHz, MICROCONTROLLER, PQFP48 |
| MB89P475P-SH-202 | 8-BIT, 12.5 MHz, MICROCONTROLLER, PDIP48 |
| MB89PV470CF-201 | 8-BIT, 12.5 MHz, MICROCONTROLLER, CQFP48 |
| MB89P485-104PMC | MICROCONTROLLER, PQFP64 |
| MB89P485L-102PMC | MICROCONTROLLER, PQFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MB89480 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89480L | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89485 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89485L | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89485LPFM | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
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