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參數資料
| 型號： | AD8174-EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 250 MHz, 10 ns Switching Multiplexers w/Amplifier |
| 中文描述： | 250兆赫，10 ns的開關多路復用器瓦特/放大器 |
| 文件頁數： | 11/16頁 |
| 文件大?。?/td> | 474K |
| 代理商： | AD8174-EB |
AD8170/AD8174
–11–
REV. 0
Color Document Scanner
Charge Coupled Devices (CCDs) find widespread use in
scanner applications. A monochrome CCD delivers a serial
stream of voltage levels, each level being proportional to the
light shining on that cell. In the case of the color image scanner
shown, there are three output streams, representing red, green
and blue. Interlaced with the stream of voltage levels is a voltage
representing the reset level (or black level) of each cell. A
Correlated Double Sampler (CDS) subtracts these two voltages
from each other in order to eliminate the relatively large offsets
which are common with CCDs.
The next step in the data acquisition process involves digitizing
the three signal streams. Assuming that the analog to digital
converter chosen has a fast enough sample rate, multiplexing the
three streams into a single ADC is generally more economic
than using one ADC per channel. In the example shown, the
AD8174 is used to multiplex the red, green and blue channels
into the AD876, an 8- or 10-bit 20 MSPS ADC. Because of its
high bandwidth, the AD8174 is capable of driving the switched
capacitor input stage of the AD876 without additional buffering.
In addition to the bandwidth, it is necessary to consider the
settling time of the multiplexer. In this case, the ADC has a
sample rate of 20 MHz which corresponds to a sampling
period of 50 ns. Typically, one phase of the sampling clock is
used for conversion (i.e., all levels are held steady) and the other
phase is used for switching and settling to the next channel.
Assuming a 50% duty cycle, the signal chain must settle within
25 ns. With a settling time to 0.1% of 15 ns, the multiplexer
easily satisfies this criterion.
In the example shown, the fourth (spare) channel of the
AD8174 is used to measure a reference voltage. This voltage
would probably be measured less frequently than the R, G and
B signals. Multiplexing a reference voltage offers the advantage
that any temperature drift effects caused by the multiplexer will
equally impact the reference voltage and the to-be-measured
signals. If the fourth channel is unused, it is good design
practice to tie the input permanently to ground.
AD8174
REFERENCE
R
G
B
A0 A1 SD
ENABLE
IN0
IN1
IN2
IN3
1k
(G = +1)
CCD
CDS
CDS
CDS
CONTROL AND TIMING
AD876
8/10-BIT
20MSPS
A/D
V
OUT
–V
IN
Figure 27. Color Document Scanner
L
+1
AD8174
+1
+1
+1
2
2
+V
S
–V
S
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0.1μF
+5V
10μF
V
OUT
549
R
T
*
+
10μF
0.1μF
75
–5V
IN3
75
IN2
75
IN1
IN0
75
+5V
549
A1
R
T
*
A0
R
T
*
A2
+
SD
ENABLE
A1
A0
L
+1
AD8174
+1
+1
+1
2
2
+V
S
–V
S
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0.1μF
+5V
10μF
549
+
10μF
0.1μF
75
–5V
IN7
75
IN6
75
IN5
IN4
75
+5V
549
+
SD
ENABLE
A1
A0
*
OPTIONAL
R
BT
75
Figure 26. 8-to-1 Multiplexer
相關PDF資料 |
PDF描述 |
|---|---|
| AD8174AN | 250 MHz, 10 ns Switching Multiplexers w/Amplifier |
| AD8174AR | 250 MHz, 10 ns Switching Multiplexers w/Amplifier |
| AD8174AR-REEL | VARISTOR 11VRMS 20MM RADIAL |
| AD8170 | 250 MHz, 10 ns Switching Multiplexers w/Amplifier(高速緩沖多路復用器) |
| AD8174 | 250 MHz, 10 ns Switching Multiplexers w/Amplifier(高速緩沖多路復用器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8174-EBZ | 功能描述:AD8174 - Video, Video Multiplexer Evaluation Board 制造商:analog devices inc. 系列:- 零件狀態:有效 主要用途:視頻，視頻多路復用器 嵌入式:否 使用的 IC/零件:AD8174 主要屬性:1 通道（單路） 輔助屬性:- 所含物品:板 標準包裝:1 |
| AD8175 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Video Crosspoint Switch |
| AD8175ABPZ | 功能描述:IC CROSSPOINT SWITCH TRPL 676BGA RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 應用說明:Ultrasound Imaging Systems Application Note 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:250 系列:- 功能:開關 電路:單刀單擲 導通狀態電阻:48 歐姆 電壓電源:單電源 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V 電流 - 電源:5µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應商設備封裝:48-LQFP（7x7） 包裝:托盤 |
| AD8175-EVALZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Video Crosspoint Switch |
| AD8176 | 制造商:AD 制造商全稱:Analog Devices 功能描述:475 MHz, Triple 16 】 9 Video Crosspoint Switch |
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