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Digital Broadcast Demodulator LSI Conforms to the ISDB-T and ISDB-S Standards
CXD2807GG
CXD2807GG
Sony is now adding two new demodulator LSI products to its digital
broadcast demodulator LSI lineup.
These are the CXD2808GG, which supports the ISDB-T terrestrial digital
broadcast standard and the CXD2807GG, which in addition to terrestrial
digital broadcast also supports the ISDB-S satellite digital
broadcast standard.
Due to the adoption of a new fabrication process, these devices do
not require any external memory and achieve both lower power and
reduced mounting areas in end products. |
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CXD2807GG, CXD2808GG |
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* No external memory required
* Low power
CXD2807GG: 600 mW*1
CXD2808GG: 200 mW
* Built-in high-speed acquisition
synchronization circuit (fast
channel switching)
* Excellent multipath demodulation
characteristics
*1: When terrestrial and satellite digital broadcasts are received at the same time. |
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Terrestrial Digital Broadcast
(ISDB-T) Demodulator Block
(CXD2807GG and CXD2808GG) |
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These devices include OFDM demodulator,
error correction, and TMCC decoding
functions.
Although a large amount of memory is
required for the demodulator, these
devices are fabricated in an embedded-DRAM CMOS process and integrate a
high-capacity memory block on the same
chip. This achieves both a reduction in circuit
board mounting area and lower power.
Furthermore, by reducing the core operating
voltage to 1.2 V, the CXD2808GG
achieves the low power consumption of
about 200 mW.
The CXD2807GG and CXD2808GG provide
the following features.
• Built-in OFDM demodulator, error correction,
and TMCC decoding functions
• Both excellent static demodulation characteristics
and excellent multipath demodulation
characteristics even for echoes
outside the guard interval.
• Built-in same channel/adjacent channel
interference rejection function
• Built-in A/D converter that supports
both single and differential inputs
• ISDB-T modes: Supports mode 2 and
mode 3
• Guard interval lengths: 1/4, 1/8, and
1/16 (supported in mode 3) |
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Satellite Digital Broadcast
(ISDB-S) Demodulator Block
(CXD2807GG) |
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The CXD2807GG additionally provides
ISDB-S demodulator functions and is a
single-chip multi-format demodulator LSI
that conforms to the ISDB-T and ISDB-S
standards.
This LSI can respond to a variety of needs
for tuners with terrestrial and satellite
broadcast capabilities.
The CXD2807GG provides the following
features.
• Built-in 8PSK demodulator, error correction,
and TMCC decoding functions
• Excellent phase noise cancellation and
multipath equalization performance
• Wide frequency acquisition range AFC
circuit (±12 MHz, typical)
• Built-in adjacent channel interference
rejection function
• Zero-IF input
• Built-in A/D converter that supports
both single and differential inputs
• Includes a circuit that corrects imbalances
in both IQ orthogonality and amplitude. |
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Expansion of Sony’s Digital
Broadcast Demodulator LSI
Lineup |
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Sony has previously developed an
MOPLL IC (CXA3725ER) for terrestrial
digital and analog broadcast reception tuners
and a Zero-IF IC (CXA3685ER) for
broadcast and communication satellite reception
tuners. (See CX-NEWS, Vol. 44.)
A variety of digital broadcast tuners can
be implemented by combining these ICs. |
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•••• Mr. TOMITA, Mr. NAKANISHI and Mr. YAMAMOTO••••
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Since the A/D converter accuracy
is directly linked to demodulator
performance, we put a lot of effort
into methods for providing
clock signals to the A/D converter.
With this product as the turning
point, our goals are now to
achieve even lower power consumption
and to expand the product
lineup. |
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See
all articles with figures and tables.  |
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Vol.47 |
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