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Video Demodulation and Multiplexed Audio
Demodulation IC Supports Worldwide Terrestrial
Analog Broadcast Standards
CXD2823ER
The newly-developed Sony CXD2823ER can, in conjunction with the CXD3787ER terrestrial silicon tuner IC,
implement ultraminiature, thin-form tuners.
In addition to video demodulation functions for worldwide analog broadcasts, the M/N, B/G, I, D/K, and L/L' systems,
the CXD2823ER also includes multiplexed audio demodulation functions for the EIAJ, BTSC, A2, and NICAM standards.
The CXD2823ER contributes to higher picture quality and shorter development times by including an equalizer function that
can adjust the CVBS video output signal video frequency characteristics and group delay characteristics as a digital circuit.
The CXD2823ER (shown at the left) is the successor of the CXD2813R (shown at the right).
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CXD2823ER |
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■ Sony silicon tuner IC control
functions
■ Video output characteristic
correction equalizer function
■ Multiplexed audio demodulation
function that supports worldwide
standards
■ High linearity 12-bit A/D converter
■ Horizontal sync signal detection
function
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 Support for Worldwide Analog
Broadcast Reception |
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Although termination of analog broadcasting
is scheduled for 2009 in the US and 2011 in
Japan, functions for analog broadcast reception
are still in demand throughout the world.
Sony has therefore developed a high picture
quality analog broadcast reception IC to
match this high-definition age.
This IC integrates both video demodulation
and multiplexed audio demodulation functions
on a single chip and supports worldwide
multiplexed audio broadcasts in the EIAJ,
BTSC, A2, and NICAM standards.
Since the CXD2823ER provides worldwide
support, it radically improves product design
efficiency for tuner modules and TV sets. |
| Optimal Chip Set in Combination
with Sony Silicon Tuner ICs |
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Since the CXD2823ER includes software
that is optimized for obtaining the best performance from Sony silicon tuner ICs,
only simple commands from the TV set's
microcontroller are required. This means that
end products can be implemented with the
same ease as a conventional CAN tuner. |
High-Performance Video Demodulation
Functions
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The CXD2823ER includes a video output
signal adjustment equalizer, and can optimize
the video frequency characteristics and group
delay characteristics for each broadcast
system.
Unlike applications built using conventional
analog processing circuits, there is no need
for a trial and error sequence of creating
and testing SAW filters to create the desired
picture quality. With the CXD2823ER,
applications can create the picture quality
by simply rewriting register settings over the
I²C bus.
In TV sets implemented with conventional
analog signal-processing techniques, it was
always an issue whether or not characteristics
var iat ions due to sample-to-sample
variations and changes in supply voltage and
temperature could be held down to levels
low enough to allow mass production. With
the CXD2823ER, however, it is no longer
necessary to even think about these issues due
to the adoption of digital signal processing. |
Contributing to Lower Costs
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A SAW filter is not required when the
CXD2823ER is used in a chip set with a Sony
silicon tuner IC. When supporting SECAML
and SECAM-L', the 2 to 4 SAW filters and their switching circuits can be eliminated.
Furthermore, the CXD2823ER provides a
horizontal sync signal detection function
and, when implementing a channel search
function in the TV set, the horizontal sync
signal detection circuit in the TV set itself
can be eliminated.
Since the CXD2823ER allows a large
reduction in the number of peripheral
components compared to a conventional
analog signal-processing IC implementation,
it can achieve significant cost reductions in
the analog broadcast demodulation block for
worldwide broadcast reception. |
Low Power Consumption
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The CXD2823ER's power consumption
is about 200 mW, even when decoding
multiplexed audio broadcasts. This is about
1/3 of that of conventional circuits. This can
be effective in reducing power consumption
in TV sets. |
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•••• Mr. Fukai and Member of Research & Development Division ••••
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| While the newly-developed CXD2823ER
is a digital signal-processing IC, it
actually includes many Sony analog
signal-processing technologies. I
strongly recommend that you look
into Sony's lineup of silicon tuner ICs,
which hold great possibilities for further
miniaturization, including providing
multiple tuners in a single TV set, and
lower costs in the future. |
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See
all articles with figures and tables.  |
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Vol.57 |
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