Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

AD8184-EB Datasheet(PDF) 9 Page - Analog Devices

Part # AD8184-EB
Description  700 MHz, 5 mA 4-to-1 Video Multiplexer
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8184-EB Datasheet(HTML) 9 Page - Analog Devices

Back Button AD8184-EB Datasheet HTML 4Page - Analog Devices AD8184-EB Datasheet HTML 5Page - Analog Devices AD8184-EB Datasheet HTML 6Page - Analog Devices AD8184-EB Datasheet HTML 7Page - Analog Devices AD8184-EB Datasheet HTML 8Page - Analog Devices AD8184-EB Datasheet HTML 9Page - Analog Devices AD8184-EB Datasheet HTML 10Page - Analog Devices AD8184-EB Datasheet HTML 11Page - Analog Devices AD8184-EB Datasheet HTML 12Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 9 / 12 page
background image
AD8184
–9–
REV. 0
Color Document Scanner
Figure 23 shows a block diagram of a Color Document Scanner.
Charge Coupled Devices (CCDs) find widespread use in scan-
ner applications. A monochrome CCD delivers a serial stream
of voltages levels, each level being proportional to the light shin-
ing 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 repre-
senting 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 common
with CCDs.
CONTROL & TIMING
CDS
CDS
0.1µF
10µF
VINB
VREF
SENSE
VINA
AD9220
10/12-BIT
10MSPS
A/D
CONVERTER
OUT
CDS
A1
A0
AD8184
R
G
ENABLE
B
CCD
REFERENCE
Figure 23. 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 economi-
cal than using one ADC per channel. In the example shown, we
use the AD8184 as the multiplexer.
Because of its high bandwidth, the AD8184 is capable of driving
the switched capacitor input stage of the AD9220 without addi-
tional buffering. In addition to having the required bandwidth,
it is necessary to consider the settling time of the multiplexer. In
this case, the ADC has a sample rate of 10 MHz, which corre-
sponds to a sampling period of 100 ns. Typically, one phase of
the sampling clock is used for conversion (i.e., all levels are held
steady) and the other is used for switching and settling to the
next channel. Assuming a 50% duty cycle, the signal chain must
settle within 50 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
AD8184 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 sig-
nals. If the fourth channel is unused, it is good design practice
to permanently tie it to ground.
A 4
4 Crosspoint Switch
While large crosspoint arrays are best constructed using highly
integrated devices such as the AD8116, 16
× 16 crosspoint
switch, smaller or irregular sized arrays can be constructed using
4-to-1 multiplexers such as the AD8184. The circuit below
shows a 4
× 4 array, constructed using the AD8184 and buff-
ered using the AD8079, a dual, fixed gain of 2 or 2.2, video
amplifier.
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT0
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT1
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT2
750
750
OUT
1/2 AD8079*
AD8184
IN0-IN3
OUT3
IN0-3
4
4
4
4
4
*AD8079 IS A DUAL, FIXED GAIN OF 2 AMPLIFIER
Figure 24. 4
× 4 Crosspoint Switch


Similar Part No. - AD8184-EB

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD8184ARZ-REEL7 AD-AD8184ARZ-REEL7 Datasheet
230Kb / 12P
   700 MHz, 5 mA 4-to-1 Video Multiplexer
REV. 0
AD8184 AD-AD8184_15 Datasheet
230Kb / 12P
   700 MHz, 5 mA 4-to-1 Video Multiplexer
REV. 0
More results

Similar Description - AD8184-EB

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD8184ARZ-REEL7 AD-AD8184ARZ-REEL7 Datasheet
230Kb / 12P
   700 MHz, 5 mA 4-to-1 Video Multiplexer
REV. 0
AD8184 AD-AD8184_15 Datasheet
230Kb / 12P
   700 MHz, 5 mA 4-to-1 Video Multiplexer
REV. 0
AD9300 AD-AD9300 Datasheet
158Kb / 8P
   4 x 1 Wideband Video Multiplexer
REV. A
logo
National Semiconductor ...
LMH6574 NSC-LMH6574_05 Datasheet
857Kb / 14P
   4:1 High Speed Video Multiplexer
logo
Tyco Electronics
A611 MACOM-A611 Datasheet
375Kb / 2P
   Cascadable Amplifier 5 to 700 MHz
logo
M/A-COM Technology Solu...
A611 MA-COM-A611_15 Datasheet
641Kb / 3P
   Cascadable Amplifier 5 to 700 MHz
A611 MA-COM-A611 Datasheet
1Mb / 2P
   Cascadable Amplifier 5 to 700 MHz
logo
National Semiconductor ...
LMH6574 NSC-LMH6574 Datasheet
860Kb / 15P
   4:1 High Speed Video Multiplexer
logo
Zetex Semiconductors
ZXFV302EV ZETEX-ZXFV302EV Datasheet
114Kb / 3P
   4:1 CHANNEL VIDEO MULTIPLEXER EVALUATION BOARD
logo
Burr-Brown (TI)
MPC100 BURR-BROWN-MPC100 Datasheet
351Kb / 15P
   Wide Bandwidth 4 x 1 VIDEO MULTIPLEXER
More results


Html Pages

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


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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