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| BCM3033 PRODUCT (R) Brief OF BENEFITS BCM3033 QAMLINK (R) UNIVERSAL MODULATOR BCM3033 FEATURES SUMMARY * BCM3033 is a universal headend QAM modulator * Integrated QAMLink modulator * * * * * * * A high-performance, integrated solution for Supports 4, 16, 32, 64, 128 and 256-QAM Variable data rates up to 7 megabaud Linear phase digital square-root Nyquist transmit filters >60-dB stop band attenuation in digital filters Perfect quadrature amplitude and phase balance X/sinX filter for DAC distortion compensation (DigiCipher(R) modulators in digital cable TV headend, digital cable modem headend, digital microwave radio, SMATV and MMDS applications manufacturing costs * An integrated solution that reduces board space and * A flexible solution that supports the FEC encoding standards for North America, Europe, and Asia rates worldwide * Integrated ITU-T J.83/Annex A * A universal modulator solution that supports all data (DVB/DAVIC/IEEE802.14), Annex B II/ SCTE/DOCSISTM/EuroDOCSIS/IEEE 802.14), and Annex C (Japan) FEC Encoding * Integrated 10-bit digital-to-analog converter * Compatible with Broadcom's QAMLink receivers * BSC or SPI-compatible microcontroller interface * JTAG test interface * 120-pin PQFP package Cable Modem Termination System 44 MHz IF PA LPF BCM3033 QAM Modulator Pentium(R) PC CLOCK DATA BCM3210 MAC PCI Interface PCI Backbone CLOCK DATA 100BASE-T Ethernet 5-65 MHz VGA RF Tuner SAW LPF BCM3137 Burst Demod 1-8 Channels BCM3033 OVERVIEW 8 PS_IN[7:0] DCII PS_CLK Nyquist Filter = .12-.18 Interpolation Filter x sin x DVB PS_VALID QDDFS DAVIC D/A A_IF+/- PS_SYNC Encoder RAM_CTRL 26 Nyquist Filter = .12-.18 Interpolation Filter D_IF[9:0] DAC_CLK JTAG[3:0] JTAG Interface PLL / Clock Generation M-Bus/SPI Interface MICRO[4:0] The BCM3033 QAMLink Universal Modulator is a highlyintegrated solution that significantly decreases the board space and cost of modulators in digital cable TV headends, digital cable modem headends, digital microwave radio, SMATV and MMDS applications. Integrated features in the BCM3033 include an integrated ITU-T J.83 Annex A (DVB/DAVIC/ IEEE802.14), Annex B (DigiCipher(R) II/SCTE/DOCSIS/EuroDOCSIS/ IEEE802.14), and Annex C (Japan) FEC encoder, a QAM modulator and a D/A converter. The encoder provides coding gain and burst error correction and can be programmed to comply with the ITU-T J.83 Annex A, Annex B and Annex C coding standards. Baseband filtering and quadrature upconversion of the resulting signal is provided by the integrated QAM modulator, which can achieve IF frequencies of up to half the output sample rate. The QAM modulator is rate adaptable up to 7 megabaud and supports 4-, 16-, 32-, 64-, 128-, and 256-QAM. triple linear-phase square-root Nyquist baseband filters are in the QAM modulator and have a programmable excess bandwidth factor of 12%, 15% or 18%. The QAM modulator also has an X/sinX filter that compensates for DAC distortion. The integrated DAC in the BCM3033 is a 10-bit, 114-MS/s DAC with differential analog outputs. Operation of the BCM3033 involves a serial or parallel bit stream input that can be passed through the FEC encoder or directly to the modulator. The resulting data is interpolated, filtered, and modulated to the IF carrier. The modulator provides a 10-bit output at the chosen sample rate, which is converted to a 2-Vpp differential analog output waveform by the integrated 10-bit D/A converter. The BCM3033 is a flexible, cost-effective worldwide solution. Because the chip accepts variable data rates and supports multiple digital transmission standards, manufacturers need to develop only one modulator for worldwide use. The integrated feature set in the BCM3033 significantly reduces the board space in modulators, giving manufactures a chip solution that is both cost effective and easy to use. Broadcom(R), the pulse logo, QAMLink(R) and Connecting everything(R) are trademarks of Broadcom Corporation and its subsidiaries in the United States and certain other countries. All other trademarks are the property of their respective owners. (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2002 by BROADCOM CORPORATION. All rights reserved. 3033-PB04-R 11.20.02 Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com |
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