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參數(shù)資料
| 型號： | MB2146-302A |
| 廠商： | Fujitsu Limited |
| 英文描述： | 8-bit Proprietary Microcontrollers |
| 中文描述： | 8位微控制器專有 |
| 文件頁數(shù)： | 59/67頁 |
| 文件大?。?/td> | 783K |
| 代理商： | MB2146-302A |
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MB95120 Series
59
(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
μ
F to the analog input pin.
About errors
As |AVR
AV
SS
| becomes smaller, values of relative errors grow larger.
R
C
Analog input
Note : The values are reference values.
Analog input equivalent circuit
R
C
2.7 V
≤
AVcc
≤
3.6 V
1.8 V
≤
AVcc < 2.7 V
1.7 k
(Max)
84 k
(Max)
14.5 pF (Max)
25.2 pF (Max)
Comparator
During sampling : ON
0
5
10
15
20
25
30
35
40
0
10
20
30
40
50
60
70
80
90
100
0
1
2
3
4
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
)
Minimum sampling time [
μ
s]
E
]
Minimum sampling time [
μ
s]
E
]
AV
CC
≥
1.8 V
AV
CC
≥
2.7 V
AV
CC
≥
2.7 V
The relationship between external impedance and minimum sampling time
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB2146-303 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontrollers |
| MB2146-303A | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Microcontrollers |
| MB2146-303A-E | 制造商:FUJITSU 功能描述:KIT MCU BOARD 8FX FAMILY 制造商:FUJITSU 功能描述:F2MC-8FX, MB95FV100D-103, EVAL BOARD; Silicon Manufacturer:Fujitsu; Silicon Family Name:F2MC-8FX; Kit Contents:Board; Features:LVD2 Detection Voltage Selector Jumper Plug, BGM Adapter Connector ;RoHS Compliant: NA |
| MB2146-401 | 制造商:FUJITSU 功能描述:KIT EVALUATION BOARD 8FX FAMILY |
| MB2146-401-01A | 功能描述:KIT STARTER F2MC-8FX 3V RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:F²MC-8FX 標(biāo)準(zhǔn)包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁面:659 (CN2011-ZH PDF) |
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