Meets All Latest Worldwide
DTTV Specifications |
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There are many different DTTV specifications
worldwide which the receiver
design had to address. One of the most
challenging was the Scandinavian Nordig
Unified specification which along with
many others required development of new
signal processing functions, such as handling
signal echoes located outside the
COFDM guard interval, or reducing
losses in time-varying channels that might
occur with an indoor aerial. Meeting these
DTTV specifications gives Sony an essential
competitive advantage. |
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Zero IF Interface (ZIF) for Use
with Future Silicon Tuners |
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Sony is developing ZIF silicon tuner ICs
to reduce cost and size of the DTTV front-end,
as well as support mobile DTTV
receiver applications. The CXD1968R is
designed to operate with these new ZIF
tuners (as well as existing IF tuners), by
including extra signal processing functions
to minimize unique ZIF tuner
signal impairments, such as I/Q amplitude/phase imbalances, and DC offsets.
Using a ZIF interface significantly
reduces board area and component count
for our customers. |
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Lowest Power DVB-T
Demodulator on the Market |
|
Power consumption is a key feature in
portable applications such as Memory
Stick or USB TV receivers, but also in
compact Set-Top-Box and IDTV (integrated
DTV) designs, which must also
remain in standby mode for long periods
of time. The CXD1968R has class leading
operating power consumption of 150
mW, as well as a very low standby power
consumption. |
|
Flexible Clocking Options
Save Cost by Using Tuner
Crystal Clock Source |
|
Reducing system design cost is vital in a
fiercely competitive DTTV receiver market.
A significant cost saving was made
by eliminating the separate demodulator
crystal. An on-chip PLL driven by the
tuner crystal oscillator generates the required
clocks. Careful attention to signal
integrity during IC design and layout was
essential. |
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Auto Acquisition/Recovery
Controller Minimizing Host
Processor Software Overhead |
|
Sony requested a reduction in the host
processor software overhead during channel
zapping and recovery. A hardware
state-machine based controller was added
to quickly acquire/re-acquire the DTTV
signal whenever a new signal acquisition
is needed without any host processor
intervention. This feature reduces work
and time to market for our customers. |
High-Performance DVB-T COFDM Demodulator
Featuring ZIF Interface and Best-in-Class Power Consumption
Vol.44
