Broadcom Corporation - BCM4500 - 8PSK/TC Advanced Modulation Satellite Receiver

The BCM4500 is a single chip digital satellite receiver supporting QPSK, 8PSK and 16QAM modulations with iteratively (turbo) decoded error correction coding. It represents an industry milestone in terms of satellite system throughput and operating points. The BCM4500 also receives DVB, DIRECTV and Digichiper II (DCII) QPSK signals to support legacy system operation. The BCM4500 contains dual 7-bit A/D converters an all-digital variable rate BPSK / QPSK / 8PSK / 16QAM receiver, an advanced modulation turbo FEC decoder, and a DVB / DIRECTV / DCII compliant FEC decoder. All required RAM is integrated and all required Clocks are generated on chip from a single reference crystal. Baseband I/Q Analog waveforms are sampled by the integrated 7-bit A/D converters resampled by integrated interpolative digital Filter banks, and filtered by dual square-root Nyquist Filters Optimized soft decisions are then fed into either a DVB / DIRECTV / DCII compliant FEC decoder, or an advanced modulation turbo decoder. The final error-corrected output is delivered in MPEG-2 or DIRECTV transport format. The output Clock is generated by an on-chip PLL for low jitter operation and glueless integration with Broadcom's BCM7020 HD graphics and Video subsystem.The BCM4500 contains a Microcontroller which implements a high level language Interface for easy host software development. It also contains an integrated DiSEqCTM controller for two way Communication with LNB.
By Broadcom Corp.
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