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參數(shù)資料
| 型號： | MB89202P-SH |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12.5 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 1.778 MM PITCH, PLASTIC, DIP-32 |
| 文件頁數(shù)： | 29/48頁 |
| 文件大小： | 1266K |
| 代理商： | MB89202P-SH |
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MB89202R Series
DS07-12562-3E
35
(3) Notes on Using A/D Converter
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.
To satisfy the A/D conversion precision standard, consider the relationship between the external impedance
and minimum sampling time and either adjust the 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
μF to the analog input pin.
About errors
As |VCC
VSS| becomes smaller, values of relative errors grow larger.
R
C
Analog input circuit model
Analog input
Comparator
↑
During sampling : ON
R
2.2 k
Ω (Max)
2.0 k
Ω (Max)
C
45 pF (Max)
16 pF (Max)
Note: The values are reference values.
MB89202/202Y
MB89F202RA/F202RAY
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 (
μs)
Minimum sampling time (
μs)
External
impedance
(k
Ω
)
External
impedance
(k
Ω
)
[External impedance
= 0 kΩ to 100 kΩ]
[External impedance
= 0 kΩ to 20 kΩ]
MB89202/202Y
MB89F202RA/F202RAY
MB89202/202Y
MB89F202RA/F202RAY
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MB89251A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:SERIAL DATA TRANSMITTER / RECEIVER |
| MB89254 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:PROGRAMMABLE TIMER |
| MB89255A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:PARALLEL DATA I/O INTERFACE |
| MB89259A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:INTERRUPT CONTROLLER |
| MB89322B | 制造商:Fuji Electric 功能描述:89322B 制造商:FUJITSU 功能描述:89322B |
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