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MB90378 Datasheet(PDF) 59 Page - Fujitsu Component Limited.

Part No. MB90378
Description  16-bit Proprietary Microcontroller
Download  65 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
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MB90378 Datasheet(HTML) 59 Page - Fujitsu Component Limited.

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MB90378 Series
59
7.
Notes on Using A/D Converter
• About the external impedance of the 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 charged to the internal sampling and hold capacitor is insufficient, adversely affecting
A/D conversion precision.
• 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.
• If the sampling time cannot be sufficient, connect a capacitor of about 0.1
µF to the analog input pin.
• About errors
As |AVR
− AVSS| becomes smaller, values of relative errors grow larger.
R
C
• Analog input circuit model
Analog input
Comparator
During sampling : ON
R
1.9 k
Ω (Max)
C
25 pF (Max)
Note : The values are reference values.
MB90F378/V378
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
0
0
1
2
34
5
6
7
8
0
2
4
6
8
10
12
14
16
18
20
MB90F378/V378
MB90F378/V378
• The relationship between the external impedance and minimum sampling time
Minimum sampling time (
µs)
Minimum sampling time (
µs)
[External impedance
= 0 kΩ to 100 kΩ]
[External impedance
= 0 kΩ to 20 kΩ]


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