BCM3118B PRODUCT Brief ® BCM3118B B C M 3 1 1 8 B Q A M L I N K ® D V B / D AV I C F E AT U R E S S U M M A R Y O F RECEIVER B E N E F I T S • Downstream QAM receiver for international • Fully integrated solution enables less-complex, • Integrated QAMLink receiver with Forward Error • Significantly increases channel capacity • Variable data rates enable systems to adapt to applications Correction (FEC) • 1-7 MBaud variable symbol rate receiver • Supports variable channelization • Supports 4, 16, 32, 64, 128 and 256-QAM • Digital demodulator, Nyquist filters, tracking loops, and 20-tap adaptive decision feedback equalizer • Digital derotator for wideband carrier phase tracking • DVB/DAVIC-compliant FEC decoder • Reed-Solomon (N,K) = 204,188: t=8 • Convolutional detinterleaver, I=1-12 with internal RAM, I=204 with external RAM low-cost cable modems and cable-TV set-top boxes channels encoded at different data rates • Integrated A/D converter reduces system manufacturing costs and complexity • A universal chip solution that supports DVB, DAVIC, ITU-T J.83/Annex A and Annex C, IEEE 802.14-based systems • Digital adaptive equalizers ensure robust performance in the presence of multipath reflections • I C or SPI-compatible microcontroller interface • Integrated 10-bit analog-to-digital converter • On-chip generation of all clock and control signals • JTAG test interface • 100-pin PQFP Package 2 Interactive Set-Top Box with DOCSIS and Watch and Record Dual Video Channels Video 1 DOCSIS/EuroDOCSIS 1.1/1.0 Out-of-Band BCM3250 Advanced Single-Chip Set-Top Box Front End Video 1 Video Out PCI BCM7030 High Definition Video/Graphics Subsystem Video 2 BCM3118B Audio Out Video 2 CPU B C M 3 1 1 8 B O V E R V I E W 4 Nyquist α = .13-.15 10 A_IF+/- A/D Phase Recovery and 8-Tap FFE Variable Rate Demod I ReedSolomon Decoder (204, 188) t=8 12-Tap DFE Nyquist α = .13-.15 PS_DATA 4 LPS_SYNC LPS_DATA [7:0] PS_ERR Q RAM_CTRL sin ωn cos ωn LPS_CLK Deinterleaver RAM AGC_CTRL BAUD_CTRL IF_OSC Acquisition/Tracking Loops and Clock Generation Phase ROM JTAG Tuner Control JTAG [3:0] RF [5:0] GEN_CTL The BCM3118B QAMLink DVB/DAVIC Receiver with FEC is an integrated digital transmission solution for cable modems, cable-TV set-top boxes and digital microwave radios. Its bandwidth-efficient feature set expands the existing potential bandwidth of a standard analog network and provides operators with reliable, error-free transmission. Optimized for highvolume manufacturing, the BCM3118B is a highly integrated solution that reduces the system-level chip count, the cost, and the complexity associated with manufacturing RF receivers. A single-chip solution, the BCM3118B has a 10-bit A/D converter, a 256-QAM demodulator with square-root raisedcosine receive filters, an adaptive equalizer with an embedded phase recovery derotator, acquisition and tracking loops, and a DVB/DAVIC-compliant Reed-Solomon FEC decoder with deinterleaver. The demodulator supports QPSK, 16, 32, 64, 128 and 256-QAM formats and adapts to channels encoded at different data rates up to 56 Mbps. The equalizer in the BCM3118B achieves transmission performance within 1 dB of theory over worse-case channels with multipath delays as long as 2.4 microseconds at 5 MBaud or 1.7 microseconds at 7 MBaud and amplitudes within .5 dB of the desired signals. With this level of performance, the BCM3118B combats the effects of channel distortions commonly found in cable-TV systems. The MBus/SPI Interface MICRO [3:0] BCM3118B has an integrated A/D converter, which eliminates the costs associated with fine tuning of external components during high-volume production. The BCM3118B samples the analog IF waveform being delivered to BCM3118B by the integrated A/D converter. The signal is then digitally mixed to baseband and filtered by dual square-root Nyquist filters. Inter-symbol interference is then removed by the adaptive decision feedback equalizer. A decision slicer, which supports constellations up to 256-QAM, formats the equalized data. The data is then fed into a DVB/DAVICcompliant synchronization block, deinterleaver, Reed-Solomon FEC, and derandomizer. The final error-corrected output is delivered in an MPEG-2 transport format. The BCM3118B can be used as a stand-alone chip or with Broadcom's BCM3250 for a complete watch and record solution with EuroDOCSIS. Compliant with the ITU-T J83/Annex A and Annex C, DVB/DAVIC and the IEEE802.14 cable transmission standards for QAM downstream, the BCM3118B is a universal downstream solution for worldwide coaxial cable applications. Broadcom®, the pulse logo, QAMLink® and Connecting everything® are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other trademarks are the property of their respective owners. ® BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 © 2003 by BROADCOM CORPORATION. All rights reserved. 3118B-PB05-R-06.13.03 Phone: 949-450-8700 FAX: 949-450-8710 Email: [email protected] Web: www.broadcom.com