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| BCM3116 PRODUCT (R) Brief (R) BCM3116 BCM3116 QAMLINK RECEIVER OF BENEFITS FEATURES SUMMARY * Downstream QAM Receiver for North American set* Integrated QAMLink correction (FEC) top box and DOCSIS cable modem applications. (R) * Fully integrated, DOCSIS-based solution for cable modems and cable-TV set-top boxes * Enables the industry's lowest cost, least complex system * Simplifies system, board and software design through the integration of analog components * Reduces power consumption * Robust performance in the presence of multipath at high order QAM constellations * Superior echo cancellation capability for both wired and wireless applications receiver with forward error * ITU-T J.83 Annex B-compliant FEC decoder * 5.059641/5.360537 MBaud variable symbol rate * Supports 64 and 256-QAM * Digital demodulator, Nyquist filters, tracking loops, and 32-tap adaptive decision feedback equalizer * Digital derotator for wideband carrier phase tracking * 16-state trellis decoder * Reed-Solomon (n,k) = (128,122); t = 3 * Programmable convolutional deinterleaver, I*J <128 with internal RAM, I*J>128 with external RAM * Enhanced digital adaptive equalization * IC or SPI-compatible microcontroller interface * On-chip generation of all clock and control signals * 3.3V operation * JTAG Test Interface * 100-pin PQFP Interactive Set-top Box with DOCSIS and Watch and Record Dual Video Channels Video 1 DOCSIS 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 Audio Out BCM3116 Video 2 CPU BCM3116 OVERVIEW Nyquist =.12,.18 A_IF 10-Bit A/D 10 Variable Rate Demod Nyquist =.12,.18 Phase Recovery and 8-Tap FFE 4 24-Tap DFE 4 ITU-T J.83 Annex B FEC Decoder P_DATA P_CLK P_SYNC P_VALID P_ERR Q cos n sin n Deinterleaver RAM Acquisition/Tracking Loops and Clock Generation Phase ROM JTAG Tuner Control MBus/SPI Interface JTAG[3:0] RF[7:0] RAM_CTRL AGC_CTRL BAUD_CTRL IF_OSC GEN_CTL MICRO[3:0] The BCM3116 QAMLink Receiver is a fully asynchronous design with an integrated FEC and 10-bit analog-to-digital converter. It provides a complete 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. The BCM3116 accepts a modulated data stream at up to 38.8 Mbps and delivers a demodulated, equalized and error-corrected output data stream. The receiver integrates a 10-bit A/D converter, a 256-QAM demodulator with square-root raisedcosine receive filters, a 32-tap adaptive equalizer with an embedded phase recovery derotator, acquisition and tracking loops, and a forward error correction (FEC) decoder. The FEC is ITU-T J.83 Annex B, DOCSIS, DigiCipher II(R), IEEE 802.14, and SCTE DVS-031-compliant. The analog IF waveform is fed into the chip, where it is sampled by the integrated A/D converter, digitally mixed to baseband and filtered by dual square-root Nyquist filters. Inter-symbol interference is then removed by the adaptive decision feedback equalizer (DFE). A decision slicer, which supports constellations up to 256-QAM, formats the equalized data which is then fed into a trellis decoder, derandomizer, deinterleaver, and ReedSolomon decoder. The final error-corrected output is delivered in non-MPEG or in MPEG-2 transport format. Optimized for high-volume manufacturing, the BCM3116 represents a highly integrated solution that reduces the systemlevel chip count, the cost and the complexity associated with manufacturing RF receivers. Broadcom(R), the pulse logo, QAMLink(R) and Connecting everything(R) 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. (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2003 by BROADCOM CORPORATION. All rights reserved. 3116-PB06-R-06.13.03 Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com |
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