參數(shù)資料
型號(hào)： MB90F823PF
廠商： Electronic Theatre Controls, Inc.
英文描述： Scan Test Devices With Octal Bus Transceivers 28-LCCC -55 to 125
中文描述： 16位微控制器專有
文件頁數(shù)： 92/98頁
文件大小： 1415K
代理商： MB90F823PF
MB90820 Series
92
7.
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.
Notes on Using A/D Converter
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
μ
F to the analog input pin.
About the error
The accuracy gets worse as
|
AVR
AV
SS
|
becomes smaller.
R
C
R
C
MB90822
MB90F822
2.0 k
(Max)
2.0 k
(Max)
14.4 pF (Max)
16.0 pF (Max)
Analog input circuit model
Analog input
During sampling : ON
Comparator
Note : The values are reference values.
MB90F822
MB90822
0
5
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
90
100
MB90F822
MB90822
0
1
2
3
4
5
6
7
8
0
2
4
6
8
10
12
14
16
18
20
(External impedance
=
0 k
to 100 k
)
(External impedance
=
0 k
to 20 k
)
E
]
Minimum sampling time [
μ
s]
E
]
Minimum sampling time [
μ
s]
The relationship between the external impedance and minimum sampling time
相關(guān)PDF資料
PDF描述
MB90F823PFM Scan Test Devices With Octal Bus Transceivers 24-CDIP -55 to 125
MB90F823PFV 10-Bit Buffers/Drivers With 3-State Outputs 28-LCCC -55 to 125
MB90822PFV 10-Bit Buffers/Drivers With 3-State Outputs 24-CFP -55 to 125
MB90822 16-bit Proprietary Microcontroller
MB90822PF 16-bit Proprietary Microcontroller
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