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参数资料
| 型号： | MB90822PFV |
| 厂商： | FUJITSU LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件页数： | 95/100页 |
| 文件大小： | 1414K |
| 代理商： | MB90822PFV |
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MB90820 Series
94
7.
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. Therefore, 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.
And if the sampling time cannot be sufficient, connect a capacitor of about 0.1 mF to the analog input pin.
About the error
The accuracy gets worse as
| AVRAVSS | becomes smaller.
R
C
RC
MB90822/823
2.0 k
(Max)
14.4 pF (Max)
MB90F822A/F823A
2.0 k
(Max)
16.0 pF (Max)
Analog input circuit model
Analog input
During sampling : ON
Comparator
Note : The values are reference values.
MB90F822A/F823A
MB90822/
823
0
5
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
90
100
MB90F822A/F823A
MB90822/
823
01234567
8
0
2
4
6
8
10
12
14
16
18
20
(External impedance
= 0 k to 100 k)
(External impedance
= 0 k to 20 k)
External
impedance
[k
]
Minimum sampling time [
s]
External
impedance
[k
]
Minimum sampling time [
s]
The relationship between the external impedance and minimum sampling time
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MB90823 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
| MB90823B | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
| MB90823BPF | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
| MB90823BPMC | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
| MB90823BPMC1 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:16-bit Microcontroller |
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