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參數(shù)資料
| 型號： | MB89498PFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit Proprietary Microcontroller CMOS |
| 中文描述： | 8-BIT, MROM, 12.5 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 45/57頁 |
| 文件大?。?/td> | 341K |
| 代理商： | MB89498PFV |
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MB89490 Series
45
(3) 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 sample 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
μ
F to the analog input pin.
About errors
As |AVRH
AV
SS
| becomes smaller, values of relative errors grow larger.
R
C
Analog input circuit model
Note : The values are reference values.
Analog input
During sampling : ON
Comparator
R
C
MB89498
MB89F499
2.4 k
(Max) 44.0 pF (Max)
2.4 k
(Max) 28.6 pF (Max)
MB89F499
MB89498
100
90
80
70
50
60
40
30
20
10
0
0
5
10
15
20
25
30
35
MB89F499
MB89498
20
18
16
14
10
12
8
6
4
2
0
0
1
2
3
4
5
7
8
6
(External impedance
=
0 k
to 100 k
)
(External impedance
=
0 k
to 20 k
)
Minimum sampling time [
μ
s]
Minimum sampling time [
μ
s]
E
]
E
]
The relationship between external impedance and minimum sampling time
相關PDF資料 |
PDF描述 |
|---|---|
| MB89530A | 8-BIT MICROCONTROLLER |
| MB89530 | 8-bit Original Microcontroller |
| MB89537 | 8-bit Original Microcontroller |
| MB89537C | 8-bit Original Microcontroller |
| MB89537CP | 8-bit Original Microcontroller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MB894-C6-R | 制造商:IBase Technology (USA) Inc. 功能描述:MATX, ZC CELERON M 600MHZ, 852GM, VGA, 10/100BT X 1, COMX4, - Bulk |
| MB894F-R | 制造商:IBase Technology (USA) Inc. 功能描述:MATX, SOCKET 479, 855GME, VGA, 10/100BT X 1 + GBE X 1, COMX4 - Bulk |
| MB89530 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Original Microcontroller |
| MB89530A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Microcontroller |
| MB89535A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series |
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