參數(shù)資料
型號： MB91461PMC-GSE1
元件分類： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PQFP176
封裝： 24 X 24 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, PLASTIC, LQFP-176
文件頁數(shù)： 73/84頁
文件大?。?/td> 2114K
代理商： MB91461PMC-GSE1
MB91460 Series
DS07-16602-2E
75
(2) Cautions Relating to the A/D Converter
The diagram below shows the equivalent circuit of the sampling circuit in the A/D converter.
The output impedance of the external circuit connected to the analog input must satisfy the following criteria.
The recommended output impedance for the external circuit is 1.9 k or less.
If an external capacitor is used, remember to consider the capacitive voltage divider effect due to the external
capacitor and the internal capacitor in the chip. Accordingly, an external capacitance several thousand times
that of the internal capacitance is recommended.
The analog voltage sampling period may be too short if the output impedance of the external circuit is high.
In this case, select Rext and Tsamp such that they satisfy the following condition.
Rext
= Tsamp/ (7 × Cin) Rin
Rext
: Output impedance of the analog signal source
Tsamp
: Sampling time
Cin
: Equivalent capacitance of analog input
Rin
: Equivalent resistance of analog input
Analog
signal source
Rext
Analog
input pin Analog SW
Rin:1.9 k
(Max)
Cin:14.7 pF (Max)
A/D converter
Device internal circuit
Input impedance
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