参数资料
型号: MB89T637RPF
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 10 MHz, MICROCONTROLLER, PQFP64
封装: PLASTIC, QFP-64
文件页数: 40/59页
文件大小: 864K
代理商: MB89T637RPF
MB89630R Series
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 followingconditions.
If the output impedance of the external circuit is too high, an analog voltage sampling time might beinsufficient
(sampling time = 6
s at 10MHz oscillation.) Therefore, it is recommended to keep the output impedance of the
external circuit below 10 k
.
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
Approx. 1.5 k
Approx. 60 pF
Approx. 4 pF
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