參數(shù)資料
型號(hào)： MB89945PF
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP48
封裝： PLASTIC, QFP-48
文件頁(yè)數(shù)： 27/38頁(yè)
文件大?。?/td> 380K
代理商： MB89945PF
MB89940 Series
33
7.
Notes on Using A/D Converter
Input impedance of the analog input pins
The A/D converter used for the MB89940 series 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 | AVCC – AVSS |, the greater the error would become relatively.
Analog Input Equivalent Circuit
Sample hold circuit
Analog channel selector
Close for 8 instruction cycles after activating
A/D conversion.
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 pin
Comparator
R = 6 k
.
C = 33 pF
.
相關(guān)PDF資料
PDF描述
MB89965PFV1-G-XXX 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP48
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MB89965PF-G-XXX 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP48
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參數(shù)描述
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MB89951 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller
MB89951PFM 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller
MB89953 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller
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