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參數資料
| 型號： | AD8180 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10 ns Switching Multiplexers(開關多路復用器) |
| 中文描述： | 10ns的開關多路復用器（開關多路復用器） |
| 文件頁數： | 9/12頁 |
| 文件大小： | 345K |
| 代理商： | AD8180 |
AD8180/AD8182
–9–
REV. 0
Picture-in-Picture or Pixel Switching
Many high end display systems require simultaneous display of
two video pictures (from two different sources) on one screen.
Video conferencing is one such example. In this case the remote
site might be displayed as the main picture with a picture of the
local site “inset” for monitoring purposes. The circuit in Fig-
ure 23 could also be used to implement this “picture-in-picture”
application.
Implementing a picture-in-picture algorithm is difficult for sev-
eral reasons. Both sources are being displayed simultaneously
(i.e., during the same frame), both sources are in real time, and
both must be synchronized. Figure 24 shows the raster scan-
ning that takes place in all monitors. During every horizontal
scan that includes part of the inset, the source must be switched
twice (i.e., from main to inset and from inset to main). To avoid
screen artifacts, it is critical that switching is clean and fast. The
AD8180 and AD8182, in the above application, switch and
settle to 0.1% accuracy in 14 ns. We quadratically add this
value to the 10 ns settling time of the AD8001, and get an over-
all settling time of 17.2 ns. This yields a sharp, artifact-free bor-
der between the inset and the main video.
INSET VIDEO
MULTIPLEXER MUST SWITCH
CLEANLY ON EACH CROSSING
MAIN VIDEO
Figure 24. “Picture-in-Picture,” Pixel Switching
Color Document Scanner
Figure 25 shows a block diagram of a Color Document Scan-
ner. 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 Corre-
lated Double Sampler (CDS) subtracts these two voltages from
each other in order to eliminate the relatively large offsets which
are common with CCDs.
CONTROL AND TIMING
AD876 8/10-BIT
20MSPS
A/D
AD8182
OUT A
OUT B
CDS
CDS
CDS
REFERENCE
R
G
B
C
C
D
IN0 A
IN1 A
IN1 B
IN0 B
S
S
E
E
100
4:1 MUX TRUTH TABLE
SEL A, SEL B
EN
A, ENB
OUTA, OUTB
0
0
IN0A
0
1
IN0B
1
0
IN1A
1
1
IN1B
Figure 25. Color Document Scanner
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 eco-
nomic than using one ADC per channel. In the example
shown, we use the two 2-to-1 multiplexers in the AD8182 to
create a 4-to-1 multiplexer. The enable control pins on the
multiplexers allow the outputs to be wired directly together.
Because of its high bandwidth, the AD8182 is capable of driv-
ing the switched capacitor input stage of the AD876 without
additional buffering. In addition to having the required 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 switch-
ing 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 14 ns, the multiplexer easily satisfies this criterion.
In the example shown, the fourth (spare) channel of the
AD8182 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 this input to ground.
相關PDF資料 |
PDF描述 |
|---|---|
| AD8182 | 10 ns Switching Multiplexers(開關多路復用器) |
| AD8186ARU-REEL | 480 MHz Single-Supply (5 V) Triple 2:1 Multiplexers |
| AD8186ARU-REEL7 | 480 MHz Single-Supply (5 V) Triple 2:1 Multiplexers |
| AD8187-EVAL | 480 MHz Single-Supply (5 V) Triple 2:1 Multiplexers |
| AD8187ARU | 480 MHz Single-Supply (5 V) Triple 2:1 Multiplexers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8180AN | 制造商:Analog Devices 功能描述:Analog Multiplexer Single 2:1 8-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:PDIP 2:1 WIDEBAND MULTIPLEXER - Bulk |
| AD8180ANZ | 功能描述:IC MULTIPLEXER 2X1 8DIP 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:- 其它有關文件:STG4159 View All Specifications 標準包裝:5,000 系列:- 功能:開關 電路:1 x SPDT 導通狀態電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，FCBGA 供應商設備封裝:7-覆晶 包裝:帶卷 (TR) |
| AD8180AR | 制造商:Analog Devices 功能描述:Analog Multiplexer Single 2:1 8-Pin SOIC N Tube 制造商:Rochester Electronics LLC 功能描述:SOIC 2:1 WIDEBAND MULTIPLEXER - Bulk 制造商:Analog Devices 功能描述:Multiplexer IC Multiplexer Type:Single-E |
| AD8180AR-REEL | 制造商:Analog Devices 功能描述:Analog Multiplexer Single 2:1 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:SOIC 2:1 WIDEBAND MULTIPLEXER - Tape and Reel |
| AD8180AR-REEL7 | 制造商:Analog Devices 功能描述:Analog Multiplexer Single 2:1 8-Pin SOIC N T/R |
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