BCM3137 [ETC]
QAMLinkTM QPSK/16-QAM Burst Demodulator ; QAMLinkTM QPSK / 16 -QAM解调器连拍\n
| 型号： | BCM3137 |
| 厂家： | 
ETC |
| 描述： | QAMLinkTM QPSK/16-QAM Burst Demodulator
|
| 文件： | 总2页 (文件大小：42K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
B C M 3 1 3 7
P RODUCT
Brie f
B C M 3 1 3 7 U N I V E R S A L B U R S T R E C E I V E R
B C M 3 1 3 7 F E A T U R E S
S U M M A R Y O F B E N E F I T S
The Broadcom BCM3137 is a headend QPSK/QAM
burst receiver for CMTS applications
A high-performance, integrated solution for upstream
demodulation in cable data, video and telephony
applications
•
•
•
DOCSIS/EuroDOCSIS, IEEE 802.14, DAVIC and DVB-
compliant
Provides full DOCSIS/EuroDOCSIS compliance for
use in Cable Modem Termination Systems (CMTS)
•
•
Programmable Demodulation: QPSK/16 QAM
•
•
Variable symbol rates from 100 kBaud up
to 5.12 MBaud
Seamless integration with BCM3210B CMTS Media
Access Controller (MAC)
Analog front-end featuring dual gain stages and dual
10-bit ADCs, plus a 6-bit ADC to estimate wideband
channel
•
Applicable to digital CATV reverse-channel receiver
Unprecedented integration of three on-board ADCs
•
•
Fast burst acquisition: preamble size as small
as 4 bytes
Reduces overall system cost
Increases channel density per card
Simplifies RF frontend design
•
•
•
•
•
•
Programmable components include:
Flexible symbol demapping: Differential /
Non-Differential
Enables power estimation of the entire upstream band
•
Improved ability to control external VGAs/PLLs
through integrated serial/parallel interface
•
•
RS decoder block size (N), GF (256), T = 1 to 10
Last RS codeword size: fixed or shortened
23-bit derandomizer: polynomial, seed, type
Derandomizer location: before/after RS decoder
•
•
•
•
Extraordinary handling of burst-to-burst variations
in excess of 20 dB
Supports random burst arrival
•
•
Internal burst FIFOs for receive rate de-coupling
Choice of serial data receive interfaces
JTAG Test Interface
•
•
•
•
Improved ability to remove channel impairments
through integration of an adaptive equalizer
Maximum baud rate flexibility with full
programmability from 100 kBaud to 5.12 MBaud
•
100-pin PQFP Package
DOCS IS /Eu ro DOCS IS -c o m p lia n t Ca b le Mo d e m Te rm in a t io n S ys t e m Blo c k Dia g ra m
44 MHz IF
BCM3033
QAM
PA
LPF
Modulator
Pentium
PC
CLOCK
DATA
BCM3210B
MAC
PCI
Interface
PCI
Backbone
CLOCK
DATA
100Base-T
Ethernet
5-65 MHz
RF
Tuner
VGA
SAW
LPF
B C M3 1 3 7
Burst Demod
1-8 Channels
B C M 3
1
3
7
O V E R V I E W
De-
RXDATA
randomizer
2
BITCK_RSOB
Variable
Decimator
Matched
Filter
A_SP/N
10
10
AFE
Digital
Complex
Mixer
BLKDV_REMP
Phase
Adaptive
Receive
Interface
FEC Interface
and FIFO's
(PGA's,
ADC's)
MSCLK_RXNW
MAPDV_RXEN
2
2
Derotator
Equalizer
A_IP/N
Variable
Decimator
Matched
Filter
A_QP/N
MPCLK_RCLK
MAPDATA
Channel
Charact.
Storage
RS
Decoder
DDFS
Multi-Type Burst
Configuration
Banks
Ranging
Block
Preamble
Process
Tracking
Loops
PIOA[9:0]
PIOB[9:0]
TPA[7:0]
Bypass/
Probe/
10
10
SMPLCK
External
Control
JTAG
PLL & Clock Generation
Micro Interface
8
8
TPB[7:0]
3
TCK TMS
TDI TDO
PLLBYP
XTALI XTALO
RESET
12C
SPI
SCL SDA ADDR0 ADDR1 ADDR2 ADDR3
SCK MOSI SS MISO
TM[2:0]
The
Broadcom
BCM3137
QAMLink®
Universal
The BCM3137 delivers the recovered data stream and accepts
receiver control inputs through a receive interface linked to an
MCNS MAC chip. The BCM3137 prepends ranging and data
information to each received code word and packet for
processing by the BCM3210B. An ATM UTOPIA-like receive
interface is also supported in a bit-serial style. The BCM3137
QPSK/16 QAM Burst Receiver is a complete single-chip cable
network receiver, that accepts QPSK and 16 QAM upstream
burst data in a frequency-agile, time-division multiple access
(TDMA) scheme. An analog front-end (AFE), a QAM
demodulator and an FEC decoder are integrated on this single
chip. The AFE performs coarse gain setting and A-to-D
conversion on either an IF input or baseband I/Q inputs. A digital
down-mixer translates the input spectral center to true DC.
The I and Q samples pass through dual decimators and square-
root raised cosine filters with an excess bandwidth α = 0.25.
Fast burst detection and acquisition are performed on the
preamble with programmable length and pattern. The chip
incorporates unique word (UW) detection in the preamble
process to delineate the packet and resolve phase ambiguity.
Carrier phase offset is removed by a derotator. An adaptive
equalizer characterizes the RF channel response and removes
inter-symbol interference (ISI) caused by micro-reflections.
The FEC decoder consists of a programmable derandomizer and
a programmable RS decoder. FIFO buffers provide input/output
data rate de-coupling for the FEC decoder.
2
can be configured through either an SPI or I C-compatible
serial interface.
The BCM3137 represents a highly-integrated, mixed-signal
solution that significantly increases the channel density per line
card for CMTS implementations. When combined with the
BCM3033 QAMLink Universal Modulator and the BCM3210B
QAMLink CMTS Media Access Controller, these chips are an
ideal solution for cable headends. A complete CMTS reference
design (BCM93210B), which integrates these three chips, is
available from Broadcom, providing a complete development
platform for a multi-channel, DOCSIS/EuroDOCSIS-compliant
Cable Modem Termination System.
Broadcom®, the pulse logo®, QAMLink® and Connecting EverythingTM 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.
Phone: 949-450-8700
FAX: 949-450-8710
Email: info@broadcom.com
Web: www.broadcom.com
BROADCOM CORP ORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2002 by BROADCOM CORPORATION. All rights reserved.
3137-PB04-R-4.19.02
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