参数资料
型号: MB90F345CEPF
元件分类: 微控制器/微处理器
英文描述: MICROCONTROLLER, PQFP100
封装: 14 X 20 MM, 3.35 MM HEIGHT, 0.65 MM PITCH, PLASTIC, QFP-100
文件页数: 65/84页
文件大小: 1142K
代理商: MB90F345CEPF
MB90340E Series
68
7.
Notes on A/D Converter Section
Use the device with external circuits of the following output impedance for analog inputs :
Recommended output impedance of external circuits are : Approx. 1.5 k
Ω or lower (4.0 V ≤ AVCC ≤ 5.5 V,
sampling period
= 0.5 μs)
If an external capacitor is used, in consideration of the capacitive voltage dividing effect between the external
capacitor and the internal on-chip capacitor, it is recommended that the capacitance of the external capacitor
be several thousand times greater than the capacitance of the internal capacitor.
If the output impedance of the external circuit is too high, a sampling period for an analog voltage may be
insufficient.
C
Comparator
Analog input
R
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
Analog input circuit model
Note : Use the values in the figure only as a guideline.
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