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參數(shù)資料
| 型號(hào)： | MB90947APF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 3.35 MM HEIGHT, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁(yè)數(shù)： | 55/72頁(yè) |
| 文件大?。?/td> | 1586K |
| 代理商： | MB90947APF |
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MB90945 Series
DS07-13741-3E
59
7.
Notes on A/D Converter Section
About the external impedance of the analog input and its sampling time
A/D converter with sample & hold circuit. If the external impedance is too high to keep sufficient sampling time,
the analog voltage charged to the internal sample & 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
F to the analog input pin.
About the error
The accuracy gets worse as
|AVRH AVRL| becomes smaller.
R
C
RC
MB90F946A/947A/
F947A/F949A
2.4 k
(Max) 36.4 pF (Max)
Analog input circuit model
Note : The values are reference values.
Analog input
Comparator
During sampling : ON
0
5
10
15
20
25
30
35
100
90
80
70
60
50
40
30
20
10
0
MB90F947A
MB90F949A
0123
5678
20
18
16
14
12
10
8
6
4
2
0
MB90F947A
MB90F949A
4
(External impedance
= 0 k to 100 k)
(External impedance
= 0 k to 20 k)
Exte
rn
al
impe
dan
ce
[k
]
Minimum sampling time [
s]
Ext
e
rn
a
lim
ped
an
ce
[
k
]
Minimum sampling time [
s]
The relationship between the external impedance and minimum sampling time
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