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BCM3118B
PRODUCT
(R)
Brief
RECEIVER
BENEFITS OF
BCM3118B
BCM3118B applications
Q A M L I N K (R) D V B / D AV I C
FEATURES SUMMARY
* Downstream QAM receiver for international * Integrated QAMLink receiver with Forward Error
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 * Reed-Solomon (N,K) = 204,188: t=8 * Convolutional detinterleaver, I=1-12 with internal RAM, I=204 with external RAM
2
* Fully integrated solution enables less-complex, * Significantly increases channel capacity * Variable data rates enable systems to adapt to
channels encoded at different data rates manufacturing costs and complexity
low-cost cable modems and cable-TV set-top boxes
* Integrated A/D converter reduces system * A universal chip solution that supports DVB, DAVIC,
in the presence of multipath reflections ITU-T J.83/Annex A and Annex C, IEEE 802.14-based systems
* DVB/DAVIC-compliant FEC decoder
* Digital adaptive equalizers ensure robust performance
* 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
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 BCM7030
High Definition Video/Graphics Subsystem
PCI
Video 2
BCM3118B
Audio Out Video 2 CPU
BCM3118B
OVERVIEW
4
Nyquist = .13-.15
10
A_IF+/-
I
ReedSolomon Decoder (204, 188) t=8
PS_DATA LPS_CLK LPS_SYNC LPS_DATA [7:0] PS_ERR
A/D
Variable Rate Demod
Phase Recovery and 8-Tap FFE Nyquist = .13-.15
12-Tap DFE
4
Q
RAM_CTRL
cos n
sin n
Deinterleaver RAM
AGC_CTRL BAUD_CTRL IF_OSC GEN_CTL
Acquisition/Tracking Loops and Clock Generation
Phase ROM
JTAG
Tuner Control
MBus/SPI Interface
MICRO [3:0]
JTAG [3:0]
RF [5:0]
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
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.
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.
(R)
BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013
(c) 2003 by BROADCOM CORPORATION. All rights reserved. 3118B-PB05-R-06.13.03
Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com

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