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Worldwide TV Video Switch Supports Full HD and Wideband Signals
CXA2239R
Sony has been increasing the performance and functionality of their video switch
products to match the increasing picture quality of video sources (such as
composite signals, component signals, and even HD signals) in the TV market.
In addition to integrating the next-stage A/D converter's low-pass filter (60 MHz)
in the same package, the CXA2239R introduced here achieves the ability to
support both full high definition (1080p) signals and wideband RGB signals.
Furthermore, since it is important to recognize the standard of the input signal
for the image processing performed by the end product, the CXA2239R also
includes a signal standard discrimination circuit.
In addition, this IC supports S, D, and SCART connectors, and can be used
anywhere in the world. |
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CXA2239R |
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* Maximum 2.8 Vp-p video
signal output
* Main screen system
switch frequency response:
60 MHz flat output
* Built-in low-pass filters
(7, 14, 30, and 60 MHz)
* Supports S, D, and SCART
connectors
* Format detection function
* Built-in sync separator
circuit |
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Video Switch that Supports TV,
HDTV, and PC Signals Integrated
on a Single Chip |
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The signals used in TVs are becoming
increasingly diverse along with the
increasing screen sizes and higher picture
quality in recent TVs. This has led to demands
for video switches that can handle
TV signals. The CXA2239R can output
these TV signals (1080p) with a flat frequency
response up to 60 MHz for video
signals up to 2.8 Vp-p. The CXA2239R
also incorporates switching functions for
PC signals that were previously controlled
with other dedicated ICs. Thus the
CXA2239R achieves single-chip integration
of video switching functions for not
only TV signals, but PC signals as well. |
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Built-in 75Ω Driver |
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Prior to the CXA2239R, an external 75Ω
driver was required for the TV output connector
(MONOUT). By integrating this
driver on the same chip, the CXA2239R
reduces the number of external components
required and has evolved to a video
switch that makes end product design even
easier. |
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Built-in Low-Pass Filter |
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Prior to the CXA2239R, low-pass filters
for the A/D converter at the following
stage were required for each output connector.
The CXA2239R not only integrates
7, 14, and 30 MHz low-pass filters
on the same chip, it also includes a 60
MHz low-pass filter as well to support
signal standards up to full HD. |
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A Video Switch that Provides
Worldwide Support |
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The CXA2239R adds a shared function
to the S connector detection circuit that is
included in existing switches and can also
provide SCART connector detection,
which is increasingly popular in Europe.
This allows products that use the
CXA2239R to enter the European market. |
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Sync Separation and Format
Detection for All Existing Signal
Standards |
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The CXA2239R provides sync separation
and format detection for all signal
standards from existing analog connector
inputs (composite video connector, S-connector,
component video connector,
D-connector, SCART connector, and
5-wire RGBHV inputs). By setting the
post-switching operational amplifier slew
rate to be 50 [µs/V], the CXA2239R maintains
a sync width that can support format
detection even for 1080p/60 (sync width:
0.3 µs), which is the standard for which
format detection is the most difficult for
existing sync separator ICs, thus assuring
that sync separation is possible. |
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•••• Mr. WATANABE & Mr.UCHIMURA••••
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The CXA2239R was developed
based on the concept of supporting
all worldwide broadcast standards.
By combining the strengths
of all the members of the development
team, we were able to develop
a chip that not only provides
many functions, but also achieves
characteristics that will satisfy our
customers' needs. I strongly suggest
that you look into this device
to see how attractive it can be for
your products. |
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See
all articles with figures and tables.  |
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Vol.42 |
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