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參數(shù)資料
| 型號(hào)： | MB90488BPF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-bit Proprietary Microcontroller |
| 中文描述： | 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 3.35 MM HEIGHT, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 111/120頁 |
| 文件大?。?/td> | 1241K |
| 代理商： | MB90488BPF |
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MB90480/485 Series
111
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 register 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
μ
F to the analog input pin.
About errors
As |AVRH
AV
SS
| becomes smaller, values of relative errors grow larger.
Note : Concerning sampling time, and compare time when 3.6 V
≥
AV
CC
≥
2.7 V, then
Sampling time : 1.92
μ
s, compare time : 1.1
μ
s
Settings should ensure that actual values do not go below these values due to operating frequency changes.
R
C
During sampling : ON
Analog input
Comparator
Note: The values are reference values.
Analog input equivalent circuit
R
C
MB90487B
MB90F481/F482
MB90F488B/F489B 1.9 k
(Max) 25.0 pF (Max)
2.5 k
(Max) 31.0 pF (Max)
1.9 k
(Max) 25.0 pF (Max)
MB90F481/F482
MB90F488B/F489B MB90487B
100
90
80
70
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
MB90F481/F482
MB90F488B/F489B MB90487B
20
18
16
14
12
10
8
6
4
2
0
0
1
2
3
4
5
6
8
7
(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
]
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MB90488BPFV | 16-bit Proprietary Microcontroller |
| MB90F481 | 16-bit Proprietary Microcontroller |
| MB90F481PF | 16-bit Proprietary Microcontroller |
| MB90F481PFV | 16-bit Proprietary Microcontroller |
| MB90F482PF | 16-bit Proprietary Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB90488BPFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
| MB90488BPMC | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
| MB90495 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller CMOS |
| MB90495G | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller CMOS |
| MB90495G_09 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
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