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參數(shù)資料
| 型號(hào)： | MB90803PF |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 80/88頁 |
| 文件大小： | 874K |
| 代理商： | MB90803PF |
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MB90800 Series
81
<About the external impedance of analog input and its sampling time>
A/D converter with sample and hold circuit. If the extrernal impedance is too high to keep sufficient sampling
time, the analog voltage changed 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.
The relationship between external impedance and minimum sampling time
If the sampling time cannot be sufficient, connect a capacitor of about 0.1 F to the analog input pin.
<About errors>
As | AVCC | becomes smaller, values of relative errors grow larger.
Analog input circuit model
R
C
Comparator
Analog input
RC
MB90803
1.9 k
(Max) 32.3 pF (Max)
MB90F804
1.9 k
(Max) 25.0 pF (Max)
MB90V800
1.9 k
(Max) 32.3 pF (Max)
Note : The values are reference values.
During sampling : ON
100
90
80
70
60
50
40
30
20
10
0
10
15
20
25
30
35
MB90803/
MB90V800
MB90F804
20
18
16
14
12
10
8
6
4
2
0
012345
78
MB90803/
MB90V800
MB90F804
6
[External impedance
= 0 k to 100 k]
[External impedance
= 0 k to 20 k]
→ Minimum sampling time [s]
→
External
impedance
[k
]
→
External
impedance
[k
]
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB90803PF-G | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
| MB90803S | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
| MB90803SPF | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller CMOS |
| MB90803SPF-G | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
| MB90820 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
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