參數(shù)資料
型號: MB91V301A
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 68 MHz, RISC MICROCONTROLLER, CPGA179
封裝: CERAMIC, PGA-179
文件頁數(shù): 26/140頁
文件大?。?/td> 2841K
代理商: MB91V301A
MB91301 Series
DS07-16502-4E
121
About the external impedance of the analog input and its sampling time
A/D converter with sample & hold circuit. If the external impedance is too high to keep sufficient sampling time,
the analog voltage charged to the internal sampling 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.
If the sampling time cannot be sufficient, connect a capacitor of about 0.1
F to the analog input pin.
About errors
As |AVRH
AVSS| becomes smaller, values of relative errors grow larger.
R
C
Analog input equivalent circuit
Comparator
During sampling : ON
Analog input
Note : The values are reference.
RC
MB91302A
8.1 k
(Max) 10.0 pF (Max)
100
90
80
70
60
50
40
30
20
10
0
5
10
15
20
25
30
35
20
18
16
14
12
10
8
6
4
2
0
0123456
8
7
(External impedance
= 0 k to 100 k)
Minimum sampling time (
s)
Exte
rn
al
imp
eda
nce
(k
)
(External impedance
= 0 k to 20 k)
Minimum sampling time (
s)
Exte
rn
al
imp
eda
nce
(k
)
The relationship between the external impedance and minimum sampling time
MB91302A
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