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Adaptive Equalization Cable Equalizer IC Increases End Product Design Flexibility
and Features a Two-Input HDMI/DVI Switch
CXB1441R
The CXB1441R is a revolutionary cable equalizer IC that extends, to a
maximum of 50 meters*1 , the cable length for the HDMI and DVI specifications
for digital audio, video, and PC standard interfaces and that
at the same time makes the development of the receiver block of such
equipment significantly easier.
High-density data transmission over cable lengths that previously could
not be used is made possible by using the CXB1441R, which supports
a maximum data rate of 1.65 Gbps between the HDMI/DVI receiver IC
and the cable.
Furthermore, the provision of two input ports, the small size, and the
low power of the CXB1441R support both miniaturization and reduced
costs in end products.
*1: Sony reference data for 480p transmission under the standard Sony test environment |
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CXB1441R |
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* Compensates for cable attenuation
and improves the signal eye pattern
* Selects and outputs one of two TMDS
signal systems (three differential data
pairs and one differential clock pair)
* Single 3.3 V power supply, power consumption
of about 0.5 W. Lead-free 48-pin LQFP package (7 mm × 7 mm) |
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HDMI/DVI |
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HDMI is the standard digital interface for
large-screen digital TVs, whose image
quality is rapidly improving. It is hoped
that this interface, which can be called the
home electronics version of DVI, will soon
be adopted in all digital TVs. Since these
interfaces directly exchange encoded
uncompressed digital data between equipment,
the amount of data is extremely large
and requires a data rate of about 4.5 Gbps
for full high-definition video. To directly connect DVD players, set top boxes,
games, or other video sources to a display
device for this data requires cable with
superlative high-frequency characteristics.
Such cable is, however, extremely expensive
and hard to find. |
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Cable Equalizer |
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Currently, in conventional HDMI/DVI
receiver ICs, reception for 1080p video
(data rate: 1.48 Gbps) is not possible over
a standard quality 10 meter cable. The
reason for this is that the receiver IC
performance is not adequate to handle the
increased jitter and signal attenuation that
arises due to the transmission loss in the
cable. What can resolve this problem is
the CXB1441R cable equalizer IC. The
powerful equalizer functions overcome
the cable attenuation and cable jitter and
improve the signal amplitude and eye
pattern. This equalizer circuit was implemented
by adopting Sony’s unique high-speed
wire communication IC circuit technologies
that have a proven track record
in GVIF*2 applications and high-speed
mixed-signal BiCMOS process.
*2: GVIF: Gigabit Video InterFace |
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Significant Increase in
Application Design Flexibility |
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This IC’s powerful equalizing functions
do not require any external control signals
(only two external signals required for
control: a chip enable signal and an input
port selection signal). Furthermore, this
IC’s compact size (7 mm × 7 mm LQFP
package) and low power (about 0.5 W)
contribute to even more compact design
of the internal HDMI/DVI receiver block.
Also, comparatively inexpensive FFC and
FPC flat cable can be used for output signal
routing.
Receiver modules formed from external
parts including this IC and a receptacle can
radically increase the circuit board positioning
flexibility in end products, can
make design easier, and can contribute to
miniaturization and reduced costs. |
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•••• Mr.KIKUCHI••••
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The cable equalizer, which is the
CXB1441R’s backbone technology,
actually has a history of over
10 years in commercial video signal
SDI applications and is a Sony
specialty. This latest equalizer, in
which this traditional technology
has been refined, supports our
customers in their design of creative
TV set products.
In the future, Sony will continue to
release, one after another, ICs that
make it easy to develop end products
that were previously difficult
due to high-frequency design issues. |
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See
all articles with figures and tables.  |
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Vol.40 |
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