參數(shù)資料
型號(hào)： MB90F983
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 16-bit Proprietary Microcontroller
中文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP64
封裝： 10 X 10 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁(yè)數(shù)： 44/48頁(yè)
文件大?。?/td> 321K
代理商： MB90F983
MB90980 Series
44
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 errors grow 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
MB90982
MB90F983
2.5 k
(Max) 31.0 pF (Max)
1.9 k
(Max) 25.0 pF (Max)
MB90F983
MB90982
100
90
80
70
60
50
40
30
20
10
0
0
5
10
15
20
25
30
35
MB90F983
MB90982
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]
Minimum sampling time [
μ
s]
E
]
E
]
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