參數(shù)資料
型號(hào): MC80C52CXXX-20/883D
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
文件頁(yè)數(shù): 40/60頁(yè)
文件大?。?/td> 5137K
代理商: MC80C52CXXX-20/883D
MB89630R Series
DS07-12531-4E
45
7. Notes on Using A/D Converter
Input impedance of the analog input pins
The output impedance of the external circuit for the analog input must satisfy the following conditions.
If the output impedance of the external circuit is too high, an analog voltage sampling time might be insufficient
(sampling time = 6
μs at 10 MHz oscillation.) Therefore, it is recommended to keep the output impedance of the
external circuit below 10 k
Ω.
Error
The smaller the | AVR–AVss |, the greater the error would become relatively.
Analog input circuit model
Analog input
Note: The values mentioned here should be used as a guideline.
RON1:
RON2:
C0:
C1:
Converter
C0
C1
RON2
RON1
Approx. 1.5 k
Ω
Approx. 1.5 k
Ω
Approx. 60 pF
Approx. 4 pF
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