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MB90347E Datasheet(PDF) 68 Page - Fujitsu Component Limited.

Part No. MB90347E
Description  16-bit Microcontroller
Download  84 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
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MB90347E Datasheet(HTML) 68 Page - Fujitsu Component Limited.

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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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