參數(shù)資料
型號(hào)： MB91354APMT
元件分類： 微控制器/微處理器
英文描述： 32-BIT, MROM, 50 MHz, RISC MICROCONTROLLER, PQFP176
封裝： 0.50 MM PITCH, LEAD FREE, PLASTIC, LQFP-176
文件頁數(shù)： 26/140頁
文件大?。?/td> 3803K
代理商： MB91354APMT
MB91350A Series
DS07-16503-5E
121
About the external impedance and sampling time of the analog input
A/D converter with sample and hold circuit. If the external impedance is too high to ensure sufficient sampling
time, the analog voltage of the internal sample and hold capacitor will not be sufficiently charged, adversely
affecting the A/D conversion precision. Therefore, 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. Moreover, if sufficient sampling time cannot be ensured, connect a capacitor of about 0.1
F to the analog input pin.
About errors
The smaller the value of | AVRH
AVSS | , the greater the relative error.
R
C
Analog input circuit schematic
Analog input
During sampling : ON
Comparator
Note : The values are reference values.
RC
MB91355A/354A/353A/352A/351A
0.18 k
(Max)
63.0 pF (Max)
MB91F355A/F353A/F356B/F357B
0.18 k
(Max)
39.0 pF (Max)
100
90
80
70
60
50
40
30
20
10
0
5
10
15
20
25
30
35
MB91F355A/F356B/F357B/F353A
MB91355A/
354A/353A/
352A/351A
MB91F355A/F356B/F357B/F353A
MB91355A/
354A/353A/
352A/351A
20
18
16
14
12
10
8
6
4
2
0
012345678
(External impedance
= 0 k to 100 k)
(External impedance
= 0 k to 20 k)
E
x
te
rn
al
im
pe
da
n
c
e
[k
]
Ext
e
rn
al
imp
eda
nce
[
k
]
Minimum sampling time [
s]
Minimum sampling time [
s]
The relationship between the external impedance and minimum sampling time
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