数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

AD8182-EB 数据表(PDF) 9 Page - Analog Devices

部件名 AD8182-EB
功能描述  750 MHz, 3.8 mA 10 ns Switching Multiplexers
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8182-EB 数据表(HTML) 9 Page - Analog Devices

Back Button AD8182-EB Datasheet HTML 4Page - Analog Devices AD8182-EB Datasheet HTML 5Page - Analog Devices AD8182-EB Datasheet HTML 6Page - Analog Devices AD8182-EB Datasheet HTML 7Page - Analog Devices AD8182-EB Datasheet HTML 8Page - Analog Devices AD8182-EB Datasheet HTML 9Page - Analog Devices AD8182-EB Datasheet HTML 10Page - Analog Devices AD8182-EB Datasheet HTML 11Page - Analog Devices AD8182-EB Datasheet HTML 12Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 9 / 12 page
background image
AD8180/AD8182
–9–
REV. B
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
several 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
border 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
100
4:1 MUX TRUTH TABLE
SEL A, SEL B
ENA, ENB OUTA, OUTB
0
0
1
1
0
1
0
1
IN0A
IN0B
IN1A
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.


类似零件编号 - AD8182-EB

制造商部件名数据表功能描述
logo
Analog Devices
AD8182-EB AD-AD8182-EB Datasheet
253Kb / 12P
   750 MHz, 3.8 mA 10 ns Switching Multiplexers
REV. B
AD8182-EB AD-AD8182-EB Datasheet
256Kb / 12P
   750 MHz, 3.8 mA 10 ns Switching Multiplexers
REV. B
More results

类似说明 - AD8182-EB

制造商部件名数据表功能描述
logo
Analog Devices
AD8180 AD-AD8180 Datasheet
253Kb / 12P
   750 MHz, 3.8 mA 10 ns Switching Multiplexers
REV. B
AD8182ARZ AD-AD8182ARZ Datasheet
256Kb / 12P
   750 MHz, 3.8 mA 10 ns Switching Multiplexers
REV. B
AD8180 AD-AD8180_15 Datasheet
256Kb / 12P
   10 ns Switching Multiplexers
REV. B
AD8182 AD-AD8182_15 Datasheet
256Kb / 12P
   10 ns Switching Multiplexers
REV. B
AD8170 AD-AD8170 Datasheet
474Kb / 16P
   250 MHz, 10 ns Switching Multiplexers w/Amplifier
REV. 0
AD8174ARZ AD-AD8174ARZ Datasheet
476Kb / 16P
   250 MHz, 10 ns Switching Multiplexers w/Amplifier
REV. 0
AD8170ARZ AD-AD8170ARZ Datasheet
476Kb / 16P
   250 MHz, 10 ns Switching Multiplexers w/Amplifier
REV. 0
logo
TAI-SAW TECHNOLOGY CO.,...
TC0648B TAI-SAW-TC0648B Datasheet
394Kb / 6P
   750 MHz SMD 3.8 x 3.8 mm SAW Resonator
logo
Analog Devices
ADP3088 AD-ADP3088 Datasheet
623Kb / 11P
   1 MHz, 750 mA Buck Regulator
REV. PrK 3/28/02
ADP3088 AD-ADP3088_15 Datasheet
1Mb / 16P
   1 MHz, 750 mA Buck Regulator
REV. C
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com