參數資料
型號: MB90F997MBSPMC
廠商: FUJITSU LTD
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP48
封裝: 7 X 7 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數: 54/68頁
文件大小: 1869K
代理商: MB90F997MBSPMC
MB90990 Series
58
DS07-13753-3E
About the external impedance of analog input and its sampling time
A/D converter with sample and hold circuit. If the external impedance is too high to keep sufficient sampling
time, the analog voltage changed to the internal sample and hold capacitor is insufficient, adversely affecting A/
D conversion precision. Therefore, to satisfy the A/D conversion precision standard, consider the relationship
between the external impedance and minimum sampling time and either adjust the resistor value and operating
frequency or decrease the external impedance so that the sampling time is longer than the minimum value. And,
if the sampling time cannot be sufficient, connect a capacitor of about 0.1
μF to the analog input pin.
C
R
Analog input equivalent circuit model
Analog input
Note : The values are reference values.
4.5 V
≤ AVCC ≤ 5.5 V : R := 2.52 kΩ, C := 10.7 pF
4.0 V
≤ AVCC < 4.5 V : R := 13.6 kΩ, C := 10.7 pF
4.5 V
≤ AVCC ≤ 5.5 V : R := 4.1 kΩ, C := 8.5 pF
3.0 V
≤ AVCC < 4.5 V : R := 10.33 kΩ, C := 8.5 pF
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