參數(shù)資料
型號(hào)： MB89923PF
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80
封裝： 20 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件頁(yè)數(shù)： 30/44頁(yè)
文件大?。?/td> 1091K
代理商： MB89923PF
MB89920 Series
36
DS07-12526-2E
7. Notes on A/D Converter
The smaller | AVR – AVSS |, the greater the error would become relatively.
The output impedance of the external circuit for the analog input must satisfy the following conditions:
Output impedance of the external circuit < Approx. 10 k
If the output impedance of the external circuit is too high, an analog voltage sampling time might be insufficient
(sampling time = 7.5
s at 8 MHz oscillation).
An analog input equivalent circuit is shown below.
Since the A/D converter contains sample & hold circuit, the level of the analog input pin might not stabilize within
the sampling period after A/D activation, resulting in inaccurate A/D conversion values, if the input impedance to
the analog pin is too high. Be sure to maintain an appropriate input impedance to the analog pin.
It is recommended to keep the input impedance to the analog pin not exceed 10 k
. If it exceeds 10 k, it is
recommended to connect a capacitor of approx. 0.1
F for the analog input pin.
Except for the sampling period after A/D activation, the input leakage current of the analog input pin is less than 10
A.
Comparator
C = 60 pF
R = 3 k
(
)
Sample & hold circuit
Close for approx. 15 instruction cycles
after activating A/D conversion.
Analog channel selector
R
≤ 10 k is
recommended.
AN
If R > 10 k
, it is recommended
to connect an external capacitor
of approx. 0.1
F.
Microcontroller’s internal circuit
.
*
*:
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