BCM3037 [BOARDCOM]
BCM3037 QAMLINK-R UNIVERSAL BURST MODULATOR; BCM3037 QAMLINK -R UNIVERSAL BURST调制器
| 型号： | BCM3037 |
| 厂家： | 
Broadcom Corporation. |
| 描述： | BCM3037 QAMLINK-R UNIVERSAL BURST MODULATOR |
| 文件： | 总2页 (文件大小：113K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
BCM3037
®
BCM3037 QAMLINK® UNIVERSAL BURST MODULATOR
S U M M A R Y O F B E N E F I T S
F E A T U R E S
The Broadcom BCM3037 is a universal QPSK/QAM burst
transmitter for DOCSIS/EuroDOCSIS applications
A high-performance, integrated solution for upstream
modulation in cable data modems, interactive cable-TV set-top
boxes, and wireless applications
•
•
•
DOCSIS/EuroDOCSIS, IEEE 802.14, DAVIC and DVB-
compliant
Significantly increases upstream channel bandwidth
Supports multiple standards for worldwide deployment
•
•
•
Programmable Modulation: π/4 DQPSK, QPSK, 16-QAM
Variable symbol rates up to 6.25 MB
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•
•
•
Reduces system manufacturing costs and complexities with an
on-chip D/A converter
25 Mbps maximum data rate
Improves robustness in noisy upstream channels utilizing pre-
equalization
•
•
QAMLink modulator with α = 0.25/0.50 square-root Nyquist
filters
Fully compatible with the Broadcom BCM3137 QAMLink
headend burst demodulator
Digitally tunable IF center frequency up to 65 MHz
•
•
Programmable Components Include:
•
•
•
•
•
•
•
6 burst profiles
Analog output attenuation up to 25dB
Transmitter pre-equalizer
RS encoder, GF (256), T = 0 to 10
Last RS codeword: fixed length, shortened
23-bit randomizer: polynomial, seed, type
Differential/non-differential encoding
Integrated 10-bit digital-to-analog converter
Direct interface to BCM3250 MAC
JTAG Test Interface
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•
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64-pin PQFP Package
Interactive Set-Top Box Block Diagram with Dual Upstream Burst Modulators
BCM3037
Upstream
QPSK/16-QAM
Upstream 1
M
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PCI
Upstream 2
DOCSIS
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The BCM3037 provides a complete π/4 DQPSK, QPSK and 16-QAM
Upstream Burst Modulator and FEC encoder integrated on a single chip.
A burst FIFO buffer provides input data rate decoupling. The FEC
encoder consists of a programmable randomizer and a programmable RS
encoder. There is also a programmable preamble prepend,
programmable symbol mapper, and a programmable transmitter pre-
equalizer. The modulator consists of dual square-root raised cosine
filters with programmable excess bandwidth, α=0.25 or α=0.50,
interpolation filters, and a digital upconverter which translates the
shaped pulse to a digitally tunable IF center frequency. An integrated 10-
bit DAC then converts this signal to an analog waveform with
programmable attenuation.
power down in each burst. The output of the BCM3037 can then be sent
to a power amplifier. There are standard DAVIC A0 and ATM UTOPIA
serial input interfaces provided. There is also a generic byte-based
interface. Alternatively, the BCM3037 can be configured to provide a
data bit clock for synchronizing data. Control information is input
through either an I2C-compatible or SPI-compatible serial interface.
The BCM3037 can be used as a stand-alone chip or with one of
Broadcom’s QAMLink Receivers/Transceivers. The 10-bit D/A
converter in the BCM3037 eliminates fine tuning of external
components during high-volume production, which significantly
decreases the overall system manufacturing costs. A frequency agile
output of [5-65 MHz] that the BCM3037 can generate compensates for
severe ingress and effectively combats harsh upstream environments
found in coaxial cable applications. The BCM3037 supports all of the
cable transmission standards, including SCTE, IEEE802.14, DOCSIS/
EuroDOCSIS, DVB, and DAVIC, making it an optimal upstream
solution for worldwide coaxial cable applications.
The BCM3037 accepts a serial data stream and transmit control inputs.
The output consists of an analog modulated and filtered data burst
containing data at variable symbol rates and three modulation formats,
which are π/4 DQPSK, QPSK and 16-QAM. Modulation can include
differential or non-differential encoding. The modulated burst consists of
a power up, ramp up, preamble, data, FEC, ramp down, guard time and
Broadcom®, the pulse logo, and Connecting everything® are trademarks of Broadcom Corporation and/
or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the
property of their respective owners.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
© 2004 by BROADCOM CORPORATION. All rights reserved.
3037-PB06-R
07/08/04
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