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STV0297E
QAM demodulator IC with A/D converter
Data BriefDecember 2006 Rev 1 1/5
STV0297EQAM demodulator IC with A/D converter
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 - MHz 4 I2 C addresses Easy control and monitoring via 2-wire fast I2C
bus Additional I2 C bus (I2 C repeater) dedicated to
tuner control for minimum tuner disturbance Programmable clock derived from system
clock and available for external use Parallel and serial output interfaces, with DVB
common interface support On chip voltage regulator CMOS technology, 1.0 V operation
Applications Japan, Europe, Asia cable set-top boxes Cable modems Cable ready TV Cable PC card Cable network module
Description STV0297E2/5
1 DescriptionThe 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.
The IF can be up to 57 MHz while the STV0297E allows the sampling clock to be freely
selected from a given range (and meeting constraints derived from SAW filter and symbol
rate characteristics). All further processing is fully digital, so no external feedback loop is
required. The STV0297E handles a wide range of symbol rates, ranging from the highest
practical rates to rates as low as 0.87 Mbaud, even if there is a significant frequency offset.
The STV0297E is thus an excellent candidate for integration in world-wide set-top boxes,
cable modems and cable tuners.
It provides all demodulation and FEC functions required for the recovery of QAM modulated
bitstreams with outstanding BER results. In addition, it includes several features that give
simple and immediate access to various quality and status monitoring parameters.
The STV0297E also provides outputs, such as delayed AGC or a noise-free I²C bus
dedicated to tuner control, which simplifies the design of high-quality application boards.
These outputs are mapped to a 10-bit GPIO matrix allowing a good optimization of the
application PCB. The STV0297E outputs error corrected MPEG transport streams in a wide
variety of formats, including the DVB common interface format with programmable data
clock frequency. The STV0297E interfaces seamlessly to the packet demultiplexers
embedded in the ST backend product families.
The dynamic performance of the STV0297E has been significantly improved and is close to
theoretical limits thanks to new demodulation algorithms and a wide equalizer allowing the
STV0297E to correct both pre and post echoes.
STV0297E Description 3/5
Figure 1. STV0297E block diagram
Revision history STV0297E4/5
2 Revision history Table 1. Document revision history
STV0297E
5/5
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