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參數(shù)資料
| 型號(hào)： | MB90394HAPMT |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP120 |
| 封裝： | PLASTIC, LQFP-120 |
| 文件頁(yè)數(shù)： | 65/74頁(yè) |
| 文件大?。?/td> | 886K |
| 代理商： | MB90394HAPMT |
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MB90390 Series
68
7.
Notes on A/D Converter Section
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
F to the analog input pin.
About the error
The accuracy gets worse as
|AVRH AVRL| becomes smaller.
R
C
RC
2.4 k
(Max) 36.4 pF (Max)
Analog input circuit model
Note : The values are reference values.
Analog input
Comparator
During sampling : ON
MB90394HA/
MB90F394H/F395H
MB90F394HA/F395HA
0
5
10
15
20
25
30
35
100
90
80
70
60
50
40
30
20
10
0
MB90394HA
MB90F394H(A)
MB90F395H(A)
0123
5678
20
18
16
14
12
10
8
6
4
2
0
MB90394HA
MB90F394H(A)
MB90F395H(A)
4
(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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