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參數(shù)資料
| 型號： | MB91F492PMC-GE1 |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PQFP64 |
| 封裝： | 12 X 12 MM, 1.70 MM HEIGHT, 0.65 MM PITCH, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 48/60頁 |
| 文件大?。?/td> | 1628K |
| 代理商： | MB91F492PMC-GE1 |
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MB91490 Series
52
DS07-16912-1E
External impedance and sampling time of analog inputs
The A/D converter is fitted with a sample and hold circuit. If the external impedance is so high that there is not
sufficient time for sampling, the internal sample and hold capacitor will not fully charge to the analog voltage,
and the precision of the A/D conversion will be adversely affected. Therefore, in order to satisfy the A/D
conversion precision specifications, either adjust the register values and operating frequency or reduce the
external impedance so that the sampling time is greater than the minimum value as given by the relationship
between external impedance and minimum sampling time. If you are still unable to hold enough sampling time,
connect a capacitor of about 0.1
μF to the analog input pin.
About errors
The relative error increases as the value of |AVRH2
AVSS| decreases.
R
C
Comparator
8/10-bit A/D converter
R
4.6 k
Ω
C
12.5 pF
Analog input circuit schematic
During sampling : ON
Analog input
Note : The values are reference values.
8/10-bit A/D converter
100
90
80
70
60
50
40
30
20
10
0
8/10-bit A/D converter
20
18
16
14
12
10
8
6
4
2
0
024
14
12
10
8
6
0
0.4
0.8
2.8
2.4
2.0
1.6
1.2
3.2
The relationship between the external impedance and minimum sampling time
(External impedance
= 0 kΩ to 100 kΩ)
(External impedance
= 0 kΩ to 20 kΩ)
External
impedance
[k
Ω
]
Minimum sampling time [
μs]
External
impedance
[k
Ω
]
Minimum sampling time [
μs]
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