參數(shù)資料
型號(hào)： MB90802SPF-G
廠商： FUJITSU LTD
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)： 81/88頁
文件大?。?/td> 832K
代理商： MB90802SPF-G
MB90800 Series
82
About the external impedance of 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. Therefore, to satisfy the A/D conversion precision standard, consider the relation-ship
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.
And, if the sampling time cannot be sufficient, connect a capacitor of about 0.1
F to the analog input pin.
About errors
As | AVRH
AVSS | becomes smaller, values of relative errors grow larger.
Analog input circuit model
R
C
Comparator
Analog input
RC
MB90802 (S)/803 (S)
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
5
10
15
20
25
30
MB90802(S)/
MB90803(S)/
MB90V800
35
MB90F804
MB90802(S)/
MB90803(S)/
MB90V800
20
18
16
14
12
10
8
6
4
2
0
012345
78
MB90F804
6
(External impedance
= 0 k to 100 k)
(External impedance
= 0 k to 20 k)
Minimum sampling time [
s]
Minimum sampling time [
s]
External
impedance
[k
]
External
impedance
[k
]
The relationship between external impedance and minimum sampling time
相關(guān)PDF資料
PDF描述
MB90803PF 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP100
MB90822PFV 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80
MB90911ASPMC 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP48
MB90F912BSPMC 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP48
MB90F243PFV-ES-BND 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP80
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB90803 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller
MB90803PF 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller CMOS
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
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