參數(shù)資料
型號: MB95F168JAPMC
廠商: FUJITSU LTD
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 16.25 MHz, MICROCONTROLLER, PQFP64
封裝: 12 X 12 MM, 1.70 MM HEIGHT, 0.65 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 54/76頁
文件大小: 2445K
代理商: MB95F168JAPMC
MB95160MA Series
58
DS07–12624–4E
(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 relation-
ship 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 |VCC
VSS| 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
≤ VCC ≤ 5.5 V
2.0 k
Ω (Max)
16 pF (Max)
4.0 V
≤ VCC < 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
VCC
≥ 4.5 V
VCC
≥ 4.0 V
01
23
4
0
2
4
6
8
10
12
14
16
18
20
VCC
≥ 4.5 V
VCC
≥ 4.0 V
(External impedance
= 0 kΩ to 100 kΩ)
(External impedance
= 0 kΩ to 20 kΩ)
Minimum sampling time [
μs]
External
impedance
[k
Ω
]
Minimum sampling time [
μs]
External
impedance
[k
Ω
]
The relationship between external impedance and minimum sampling time
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