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参数资料
| 型号： | MB91F346BPFT-GE1 |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PQFP100 |
| 封装： | 12 X 12 MM, 1.20 MM HEIGHT, 0.40 MM PITCH, PLASTIC, TQFP-100 |
| 文件页数： | 60/72页 |
| 文件大小： | 657K |
| 代理商： | MB91F346BPFT-GE1 |
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MB91345 Series
63
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 sampling 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. If
the sampling time cannot be sufficient, connect a capacitor of about 0.1
F to the analog input pin.
R
C
Comparator
Analog input circuit model
Analog input pin
During sampling : ON
Note : The values are reference values.
RC
MB91F345B/F346B
1.5 k
(Max) 20.0 pF (Max)
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
0
1
2
34
5
6
7
8
0
2
4
6
8
10
12
14
16
18
20
The relationship between the external impedance and minimum sampling time
Minimum sampling time (
s)
Minimum sampling time (
s)
External
impedance
(k
)
External
impedance
(k
)
[External impedance
= 0 k to 100 k]
[External impedance
= 0 k to 20 k]
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相关代理商/技术参数 |
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|---|---|
| MB91F353A | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:32-bit Microcontroller |
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