 World's First "DVB-C2" Demodulator ICs |
|
An improvement of "DVB-C", the "DVB-C2"
standard is expected to start broadcasting
in Germany in 2012. Use of 1024/4096
QAM and LDPC code (an error correction
system) improves transmission efficiency by
60% over "DVB-C". (See table 1 and figure
1.) This solves the transmission capacity
constraints that the introduction of HD and
multiple channels by the cable TV industry
will otherwise lead to. |
| 1024/4096 QAM Compatible |
|
The CXD2835ER and the CXD2836ER are
compatible with the 1024/4096 QAM that
DVB-C2 plan to use.
Compared to the existing DVB-C, 4096 QAM
provides a multilevel modulation (See figure
2.) that is 16 times as dense as the existing
DVB-C and even minute phase noise can
substantially degrade reception performance.
The CXD2835ER and CXD2836ER represent
a further advancement of Sony's phase noise
elimination technology in demodulation IC development that offers stable reception also
in 4096 QAM reception.
|
Data Slice (Type 1 & 2) Compliant
|
|
The CXD2835ER and CXD2836ER make
possible reception of a data slice signal with
a maximum bandwidth of 7.61 MHz. One
data slice consists of multiple multiplexed TSs
(Transport Stream) in the physical layer.
In DVB-C2, data slices can be sent
contiguously without inserting a guard
band (See figure 3.) increasing the spectral
efficiency. |
DVB-T, DVB-C and DVB-T2 Compliant
|
|
Since the CXD2835ER complies with DVB-C
demodulation functions and the CXD2836ER
complies with the DVB-C, DVB-T*4 and
DVB-T2*5 demodulation functions they
enable flexible design of products as the
DVB-C2 standard becomes more common.
They will also make products more compact
and lower the number of necessary parts.
|
*4: DVB-T: Digital terrestrial broadcast standard
"ETSI EN300-744". This standard is used in
Europe and all over the world. It transmits digital
audio and video using Orthogonal Frequency
Division Multiplex (OFDM).
*5: DVB-T2: Digital terrestrial broadcast standard
"ETSI EN300-755". The second generation and
an improvement of DVB-T, the first generation
standard. It transmits digital audio and video
using Orthogonal Frequency Division Multiplex
(OFDM). |
Reduced Printed Circuit Board
and BOM Costs
|
|
The CXD2835ER and CXD2836ER are
provided in a compact package (48-pin VQFN, 7 mm × 7 mm) that will reduce the
mounting area. When combined with a Sony
silicon tuner IC (CXD2831WR), the area
occupied by the tuner on the board can be
minimized. Both ICs can run on 3.3 V and
1.2 V power supplies and select either 20.5
MHz or 41 MHz X'tal with a tolerance of up
to ±100 ppm. |
Tuner IC Chipset that Supports All
the World's Broadcasting Standards
|
|
Sony is the only manufacturer to develop
IC chipsets that support all the world's
broadcasting systems.
Since the CXD2835ER and CXD2836ER
share the package and pin assignment
with demodulator ICs for other markets
(CXD2834ER, CXD2840ER, CXD2828ER
and CXD2817ER) that were developed during
the same time period, they are mutually
replaceable. (See figures 4 and 5.)
Also, a shared driver API will minimize man-hours
spent on research and development. |
Sony Corporation Global Headquarters
World's First Demodulator ICs for "DVB-C2"
Digital Cable Broadcast Standard
Vol.67