參數(shù)資料
型號(hào)： MB95F108AJWPMC
廠商： FUJITSU LTD
元件分類(lèi)： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 16.25 MHz, RISC MICROCONTROLLER, PQFP64
封裝： PLASTIC, LQFP-64
文件頁(yè)數(shù)： 58/72頁(yè)
文件大?。?/td> 1758K
代理商： MB95F108AJWPMC
MB95100AM Series
DS07-12614-6E
61
(2) Notes on Using A/D Converter
About the external impedance of 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. Therefore, to satisfy the A/D conversion precision standard, consider the relationship
between the external impedance and minimum sampling time and either adjust the register value and operating
frequency or decrease the external impedance so that the sampling time is longer than the minimum value.
Also, if the sampling time cannot be sufficient, connect a capacitor of about 0.1
μF to the analog input pin.
About errors
As |AVR
AVSS| becomes smaller, values of relative errors grow larger.
R
C
Analog input
Note : The values are reference values.
Analog input equivalent circuit
RC
4.5 V
≤ AVcc ≤ 5.5 V
2.0 k
Ω (Max)
16 pF (Max)
4.0 V
≤ AVcc < 4.5 V
8.2 k
Ω (Max)
16 pF (Max)
Comparator
During sampling : ON
0
2
46
8
10
12
14
0
10
20
30
40
50
60
70
80
90
100
AVCC
≥ 4.5 V
AVCC
≥ 4.0 V
01
23
4
0
2
4
6
8
10
12
14
16
18
20
AVCC
≥ 4.5 V
AVCC
≥ 4.0 V
(External impedance
= 0 kΩ to 100 kΩ)
(External impedance
= 0 kΩ to 20 kΩ)
Minimum sampling time [
μs]
Exte
rn
al
impe
dan
ce
[k
Ω
]
Minimum sampling time [
μs]
Exte
rn
al
impe
dan
ce
[k
Ω
]
The relationship between external impedance and minimum sampling time
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