8 DVB-C DEMODULATOR – STV0297E
8.1
General Desription
The STV0297E is a complete single-chip QAM (quadrature amplitude modulation)
demodulation and FEC (forward error correction) solution that performs sampled IF to
transport stream (MPEG-2 or MPEG-4) block processing of QAM signals. It is intended for
the digital transmission of compressed television, sound, and data services over cable. It
is fully compliant with ITU-T J83 Annexes A/C or DVB-C specification bitstreams (ETS
300 429, “Digital broadcasting systems for television, sound and data services – Framing
structure, channel coding and modulation - Cable Systems”). It can handle square (16,
64, 256-QAM) and non-square (32, 128-QAM) constellations. Japanese DBS systems
require a transport stream multiplex frame (TSMF) layer to carry digital signals over cable
systems. When the recovered transport stream is a multiplex frame, the STV0297E post-
processes it to extract a single transport stream. Automatic detection of the TSMF layer is
provided. The chip integrates an analog-to-digital converter that delivers the required
performance to handle up to 256-QAM signals in a direct IF sampling architecture, thus
eliminating the need for external downconversion.
8.2
Features
Decodes ITU-T J.83-Annexes A/C and DVB-C bit streams
Processes Japanese transport stream multiplex frame (TSMF)
High-performance integrated A/D converter suitable for direct IF architecture in all
QAM (quadrature amplitude modulation) modes
Supports 16, 32, 64, 128 and 256 point constellations
Small footprint package: (10 x 10 mm²)
Very low power consumption
Full digital demodulation
Variable symbol rates
Front derotator for better low symbol rate performance and relaxed tuner
constraints
Integrated matched filtering
Robust integrated adaptive pre and post equalizer
On-chip FEC A/C with ability to bypass individual blocks
10 programmable GPIO
Two AGC outputs suitable for delayed AGC applications (sigma-delta outputs)
Integrated signal quality monitors, plus lock indicator and interrupt function mapped
to GPIO pin
Improved signal acquisition
System clock generated on-chip from quartz crystal
Low frequency crystal operations 4, 16, 25 - 30 MHz
4 I2C addresses
Easy control and monitoring via 2-wire fast I2C bus
Summary of Contents for MB37
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