AD8182AN Analog Devices Inc, AD8182AN Datasheet - Page 9

IC MULTIPLEXER DUAL 2X1 14DIP

AD8182AN

Manufacturer Part Number
AD8182AN
Description
IC MULTIPLEXER DUAL 2X1 14DIP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD8182AN

Rohs Status
RoHS non-compliant
Function
Multiplexer
Circuit
2 x 2:1
Voltage Supply Source
Dual Supply
Voltage - Supply, Single/dual (±)
±4 V ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
14-DIP (0.300", 7.62mm)

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD8182AN
Manufacturer:
Analog Devices Inc.
Quantity:
290
Company:
Part Number:
AD8182AN
Quantity:
114
Company:
Part Number:
AD8182ANZ
Quantity:
295
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.
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.
REV. B
Figure 24. “Picture-in-Picture,” Pixel Switching
MAIN VIDEO
CLEANLY ON EACH CROSSING
MULTIPLEXER MUST SWITCH
INSET VIDEO
–9–
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.
C
C
D
R
G
B
Figure 25. Color Document Scanner
CDS
REFERENCE
4:1 MUX TRUTH TABLE
SEL A, SEL B ENA, ENB OUTA, OUTB
CDS
0
0
1
1
CDS
CONTROL AND TIMING
IN0 A
IN1 A
IN1 B
IN0 B
AD8182
0
1
0
1
AD8180/AD8182
OUT A
OUT B
IN0A
IN0B
IN1A
IN1B
100
AD876 8/10-BIT
20MSPS
A/D

Related parts for AD8182AN