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參數(shù)資料
| 型號： | MB91316PMC-G-XXXE1 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, MROM, 40.8 MHz, RISC MICROCONTROLLER, PQFP176 |
| 封裝： | 24 X 24 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-176 |
| 文件頁數(shù)： | 62/71頁 |
| 文件大?。?/td> | 575K |
| 代理商： | MB91316PMC-G-XXXE1 |
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MB91319R Series
65
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.
About errors
As |AVRH
AVSS| becomes smaller, values of relative errors grow larger.
R
C
MB91316/316A/F318R
MB91F318S/FV319R
RC
Analog input circuit
Analog input
Comparator
↑
During sampling : ON
5 k
(Max)
27 pF (Max)
Note : The values are reference values.
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
0
MB91316/316A/F318R/F318S/FV319A
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 (
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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