BCM3116
PRODUCT
®
Brief
®
BCM3116
B C M 3 1 1 6
QAMLINK
RECEIVER
O F
B E N E F I T S
F E AT U R E S
S U M M A R Y
•
Downstream QAM Receiver for North American set-
•
Integrated QAMLink
correction (FEC)
top box and DOCSIS cable modem applications.
®
•
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
B C M 3 1 1 6
O V E R V I E W
Nyquist
α
=.12,.18
A_IF±
10-Bit
A/D
10
Variable
Rate
Demod
Nyquist
α
=.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
ωn
sin
ωn
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 raised-
cosine 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®, 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 Reed-
Solomon 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 system-
level chip count, the cost and the complexity associated with
manufacturing RF receivers.
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.
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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