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| BCM3517 (R) ATSC/VSB DIGITAL CABLE READY DTV RECEIVER FEATURES * Integrated VSB/QAM QAMLink(R) receiver 12-bit A/D converter with internal AGC amplifier Full equalizer architecture spans up to -35 to 49 s delays Direct IF sampled architecture reduces system cost Single IF signal path for QAM/VSB/NTSC to reduce system costs - ITU-T J.83 Annex A/B/C FEC modes - MPEG-2 transport output (serial/parallel) - All-digital clock and carrier recovery - Integrated PLLs to minimize external components - All acquisition times typically less than 50 ms * QPSK out-of-band receiver - 100-200-MHz receiver LO with input AGC and 6-bit A/D - Variable symbol rate QPSK receiver - Digital demodulator, Nyquist filters, tracking loops, and four-tap adaptive equalizer - DVS-167 (DavicTM)/DVS-178 (DigiCipherIITM) FEC decoder * Integrated acquisition controller - SUMMARY OF BENEFITS * Complete DTV single chip receiver solution * FCC VSB and Digital Cable Ready * Superior performance under both static and dynamic multipath channel conditions * BTSC decoder on chip * Direct interface to CMOS and discrete DTV tuners * * * * Reduces system costs through direct IF sampling Single IF path for QAM/VSB simplifies board design Smart antenna support Automatic NTSC co-channel interference and RFI rejection filters * Integrated de-interleaver RAM for VSB FEC, and QAM for modes up to J=4 reduces system costs * Analog stereo, mono, or SAP outputs * EIA/CEA-909 antenna interface * 144-pin LQFP package * I2S or baseband multiplexed audio output * On-chip stereo audio DACs * BSC master to control peripherals Plug and Play DTV System Solution In-band LNA Tuner MPEG Transport Serial/Parallel BCM3517 VSB/QAM OOB/POD OOB Tuner EIA/CEA-909 Smart Antenna Interface Audio: I2S and L/R Out-of-band Transport OVERVIEW Functional Block Diagram BSC/SPI Slave Interface BSC/ SPI Host Interface Interrupt HAB Acquisition Processor Internal Bus To All Blocks Master PLL 54 MHz rd 3 Overtone Crystal Inband Tuner Inband AFE PGA 12 bit A/ D AGC Control ATSC 8/16 VSB Advanced Receiver ATSC FEC Output Interface MPEG Transport Inband AGT Inband AGI Inband AFT 16-1024 QAM Advanced Receiver ITU-T J.83 Annex A /B/C FEC OOB Tuner OOB AGC OOB VCO OOB AFE PGA 6 bit A/D AGC Control VCO BTSC Decoder OOB QPSK Receiver DVS-167 FEC DVS-178 FEC I2S L/ R Audio or Multiplexed Baseband Audio OOB Transport for CableCard / POD HiFi DAC OOB Output Interface BSC Master Interface GPIO /GPO Interface EIA/ CEA-909 Interface JTAG Interface Tuner/Peripheral Control GPIO GPO Antenna Control JTAG Controller The BCM3517 is an ATSC/VSB Digital Cable Ready DTV receiver that contains a digital receiver that is compatible with both North American digital cable television and digital terrestrial broadcast television standards. This receiver is capable of receiving all standard-definition and high-definition digital formats (SDTV/HDTV). The on-chip audio decoder is fully compliant with the BTSC audio standard. An out-ofband QPSK receiver is also contained to meet the needs of the CableCard specification. The BCM3517's digital receiver accepts an analog signal centered at the standard television IF frequencies, and amplifies and digitizes this signal with an integrated programmable gain amplifier and 12-bit A/D converter. The output of the A/D is sent to the receiver and demodulator. The digital receiver consists of a QAM demodulator and a VSB demodulator. Each demodulator contains adaptive filters that remove multi-path propagation effects, NTSC co-channel interference, and RFI interference. The output of the VSB demodulator goes to an ATSC A/53 coding Forward Error Corrector (FEC), with integrated trellis and ReedSolomon decoder. The output of the QAM demodulator goes to an ITUT J.83 Annex A/B/C coding FEC. The output of either QAM or VSB FEC is delivered in either parallel or serial MPEG-2 transport format. An on-chip BTSC decoder handles the decoding of the base-band multiplexed audio providing a stereo left/right, mono, or SAP output via a pair of high precision HiFiDACs. All gain, clock, and carrier, acquisition, and tracking loops are integrated on-chip as are the necessary phase-locked loops, referenced to a single external crystal. Chip configuration, channel acquisition, and performance monitoring functions are conducted by the on-chip acquisition processor using Broadcom-provided software. Broadcom(R), the pulse logo, Connecting everything(R) and QAMLink(R) are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the property of their respective owners. (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2004 by BROADCOM CORPORATION. All rights reserved. 3517-PB00-R 09/7/04 Phone: 949-450-8700 Fax: 949-450-8710 E-mail: info@broadcom.com Web: www.broadcom.com |
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