參數(shù)資料
型號: MB90F488
廠商: Fujitsu Limited
英文描述: 16-bit Proprietary Microcontroller CMOS
中文描述: 16位微控制器專有的CMOS
文件頁數(shù): 104/113頁
文件大?。?/td> 522K
代理商: MB90F488
MB90480/485 Series
104
(Continued)
<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.
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.
The relationship between external impedance and minimum sampling time
If the sampling time cannot be sufficient, connect a capacitor of about 0.1
μ
F to the analog input pin.
<About errors>
As |AVRH
AV
SS
| becomes smaller, values of relative errorsgrow larger.
Note : Concerning sampling time, and compare time When 3.6 V
AV
CC
2.7 V, then
Sampling time : 1.92
μ
s, compare time : 1.1
μ
s
Settings should ensure that actual values do not go below these values due to operating frequency changes.
R
C
During sampling : ON
Analog input
Comparator
Note: The values are reference values.
Analog input circuit model
R
C
MB90487
MB90F481/F482
MB90F488
2.5 k
(Max) 31.0 pF (Max)
1.9 k
(Max) 25.0 pF (Max)
1.9 k
(Max) 25.0 pF (Max)
MB90F481/F482
MB90F488
MB90487
100
90
80
70
60
50
40
30
20
10
0
0
5
Minimum sampling time [
μ
s]
10
15
20
25
30
35
MB90F481/F482
MB90F488
MB90487
20
18
16
14
12
10
8
6
4
2
0
0
1
2
3
4
5
6
8
7
External impedance
=
0 k
to 100 k
External impedance
=
0 k
to 100 k
Minimum sampling time [
μ
s]
]
]
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