 Implements both GB 20600-2006 (DTMB) and
ETSI EN 300 429 (DVB-C) in a Single Chip |
|
The CXD2830R can demodulate digital TV signals
for both the Chinese terrestrial digital broadcast
standard (GB 20600-2006 (DTMB)) and the ETSI
EN 300 429 (DVB-C) cable digital broadcasting
standard used for cable TV in China.
For DTMB demodulation, the CXD2830R uses and
develops further the algorithms for demodulator
ICs that Sony had developed to date, and it achieves
the industry's highest level of performance.
For DVB-C, the CXD2830R provides the same
superb reception performance as the existing Sony
CXD2817R and CXD2820R devices.
Figure 1 shows the block diagram for the
CXD2830R. |
| For DTMB, High-Speed Scan Sequences can be
Implemented by Automatic C1/C3780 Discrimination |
|
DTMB has two main modes, C1 and C3780, and
the CXD2830R can automatically discriminate
and receive both of these. Since no settings need to be changed, the CXD2830R can implement high-speed
channel scanning. |
| Conforms to Chinese National Standards
(MII Specifications) |
|
The CXD2830R meets all of the Chinese national
standards (MII specifications). Not only does it
support the seven modes stipulated by the Chinese
national standards, it also exhibits superlative
reception performance even for the parameters
used in Hong Kong. |
Demodulating Algorithms that are Highly
Resistant to Multipath Interference
|
|
Since reflections are present during reception of
terrestrial broadcasts, demodulator ICs must be
able to deal with multipath. Furthermore, operation
of the so-called single-frequency network (SFN)
service has now begun, and this service makes
it possible to expand the reception area without
reducing frequency band efficiency by using the
receiver's multipath resistance functions to allow
broadcast of the same programming on the same
frequency from multiple towers. As a result, even
more powerful multipath handling functions will
be required. Figure 2 gives an overview of the
multipath environments due to both reflected
signals and to the SFN service.
The CXD2830R boasts the industry's highest
level of channel equalization performance and
has a powerful ability to handle various multipath
environments, including long delay, proximate
delay, and multiwavelength environments. Figure
3 shows the CXD2830R's multipath resistance
abilities.
Furthermore, during the reception of terrestrial
digital broadcasts, changes in the local environment
can cause dynamic fluctuations in the multipath
environment itself. The CXD2830R uses high-performance
adaptive filter algorithms to follow
these dynamic variations so that it exhibits optimal
performance at all times. (See figure 4.) |
Multiple Means for Controlling TS Output
|
|
While it goes without saying that the CXD2830R
provides switching between serial TS and parallel
TS, it also supports a wide variety of control
types, including output rate control and waveform
inversion.
Since the CXD2830R provides flexible settings
to match the TS output destination specifications,
it provides a high degree of flexibility for end-product
design. |
Package and Pin Compatibility with
the CXD2826R and CXD2829R
|
|
The CXD2830R is provided in a 12 x 12 mm
80-pin LQFP package.
Since this device shares the same package and
pin arrangement as the CXD2826R (ISDB-T/
ISDB-S demodulator IC) and the CXD2829R
(DVB-T2/DVB-T/SVB-C demodulator IC), it can
significantly reduce the effort required in printed
circuit board design. (See figure 5.)
The CXD2830R also provides a high level
of software compatibility with not only the
CXD2826R and CXD2829R, but other Sony
demodulator ICs as well, and this can reduce the
software development effort required. |
Cable and Terrestrial TV Digital Broadcast
Demodulator IC Achieves the Industry's
Top Class Performance
Vol.62