參數(shù)資料
型號(hào)： MB89PV490CF
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 8-bit Proprietary Microcontroller
中文描述： 8-BIT, 12.5 MHz, MICROCONTROLLER, CQFP100
封裝： 0.65 MM PITCH, CERAMIC, MQFP-100
文件頁(yè)數(shù)： 39/45頁(yè)
文件大小： 577K
代理商： MB89PV490CF
39
MB89490 Series
(3) Notes on Using A/D Converter
Input impedance of the analog input pins
The A/D converter used for the MB89490 series contains a sample and hold circuit as illustrated below to fetch
analog input voltage into the sample and 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
μ
F for the analog input pin.
MB89F499
2.4
k
52 pF
MB89PV490/MB89497/MB89498
2.4
k
53 pF
R: analog input equivalent resistance
C: analog input equivalent capacitance
Analog input pin
Sample hold circuit
Comparator
R C
Analog channel selector
Close for 16 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
μ
F.
Analog Input Circuit Model
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