Description

QAMi5107

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Description

The QAMi5107 provides an integrated demodulator/decoder solution for digital cable

receivers for compressed video, sound and data services. A QAM (quadrature amplitude

modulation) demodulator and FEC performs IF to MPEG-2 block processing of QAM

carriers. The demodulated stream is then processed by video and audio decoders.

The device implements a fully unified SDR SDRAM based memory architecture that

integrates the Omega2 video decoder cell together with a blitter engine and a multichannel

DMA controller to provide enhanced performance for graphics and real-time stream

transfers. Transfer of data such as pixmaps, audio streams, stills and PES can be performed

efficiently using the QAMi5107 DMA.

A true-color mode provides OSD graphics allowing the display of RGB16 formats: RGB565,

ARGB1555 and ARGB4444. This directly supports up to 65,536 colors in a region. Alpha

blending by region or by pixel is available for mixing with video and background layers. The

above feature set, guarantees a smooth user interface and high performance for demanding

middlewares such as MHP™.

The QAMi5107 is the first single chip cable STB IC to combine a very low cost solution with

advanced security features. DVB and ICAM descramblers together with a smart card

interface ensure that all the major conditional access systems can be supported.

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QAM Demodulator features

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Decodes ITU-T J.83-Annexes A/C and DVB-C bit streams

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Processes Japanese transport stream multiplex frame (TSMF)

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High-performance integrated A/D converter suitable for direct IF architecture in all QAM

(quadrature amplitude modulation) modes

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Supports 16, 32, 64, 128 and 256 point constellations

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Very low power consumption

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Full digital demodulation

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Variable symbol rates

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Front derotator for better low symbol rate performance and relaxed tuner constraints

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Integrated matched filtering

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Robust integrated adaptive pre and post equalizer

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On-chip FEC A/C with ability to bypass individual blocks

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10 programmable GPIO

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Two AGC outputs suitable for delayed AGC applications (sigma-delta outputs)

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Integrated signal quality monitors, plus lock indicator and interrupt function mapped to

GPIO pin

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Improved signal acquisition

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System clock generated on-chip from quartz crystal

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Low frequency crystal operations 4, 16, 25 - 30 MHz

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