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參數(shù)資料
| 型號(hào)： | MB89F202P-SH |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit Proprietary Microcontroller |
| 中文描述： | 8-BIT, FLASH, 12.5 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 1.778 MM PITCH, PLASTIC, DIP-32 |
| 文件頁數(shù)： | 34/44頁 |
| 文件大小： | 427K |
| 代理商： | MB89F202P-SH |
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MB89202 Series
34
(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
μ
F to the analog input pin.
About errors
As |V
CC
AV
SS
| becomes smaller, values of relative errors grow larger.
R
C
Analog input circuit model
Analog input
Comparator
↑
During sampling : ON
R
2.2 k
(Max)
2.0 k
(Max)
C
45 pF (Max)
16 pF (Max)
Note : The values are reference values.
MB89202
MB89F202
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
0
0
1
2
3
4
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 (
μ
s)
Minimum sampling time (
μ
s)
E
)
E
)
[External impedance
=
0 k
to 100 k
]
[External impedance
=
0 k
to 20 k
]
MB89202
MB89F202
MB89202
MB89F202
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