參數(shù)資料
型號(hào)： MB91487PMC-GE1
廠商： FUJITSU LTD
元件分類(lèi)： 微控制器/微處理器
英文描述： 32-BIT, MROM, 80 MHz, RISC MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁(yè)數(shù)： 82/96頁(yè)
文件大?。?/td> 2461K
代理商： MB91487PMC-GE1
MB91470/480 Series
DS07–16901–9E
83
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 |AVRH
AVSS| decreases.
R
C
Comparator
8/10-bit A/D converter
12-bit A/D converter
R
4.6 k
Ω
1.0 k
Ω
C
12.5 pF
18.0 pF
Analog input circuit schematic
During sampling : ON
Analog input
Note : The values are reference values.
8/10-bit A/D converter
12-bit A/D converter
100
90
80
70
60
50
40
30
20
10
0
8/10-bit A/D converter
12-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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