BCM3037 View Datasheet(PDF) - Broadcom Corporation

Part Name

Description

Manufacturer

BCM3037

QAMLINK® UNIVERSAL BURST MODULATOR

Broadcom Corporation 

BCM3037

®

BCM3037 QAMLINK® UNIVERSAL BURST MODULATOR

FEATURES

SUMMARY OF BENEFITS

• The Broadcom BCM3037 is a universal QPSK/QAM burst

transmitter for DOCSIS/EuroDOCSIS applications

• DOCSIS/EuroDOCSIS, IEEE 802.14, DAVIC and DVB-

compliant

• Programmable Modulation: π/4 DQPSK, QPSK, 16-QAM

• Variable symbol rates up to 6.25 MB

• 25 Mbps maximum data rate

• QAMLink modulator with α = 0.25/0.50 square-root Nyquist

filters

• 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

• 64-pin PQFP Package

• A high-performance, integrated solution for upstream

modulation in cable data modems, interactive cable-TV set-top

boxes, and wireless applications

• Significantly increases upstream channel bandwidth

• Supports multiple standards for worldwide deployment

• Reduces system manufacturing costs and complexities with an

on-chip D/A converter

• Improves robustness in noisy upstream channels utilizing pre-

equalization

• Fully compatible with the Broadcom BCM3137 QAMLink

headend burst demodulator

Interactive Set-Top Box Block Diagram with Dual Upstream Burst Modulators

Upstream 1

BCM3037

Upstream

QPSK/16-QAM

Modulator

Upstream 2

DOCSIS

Video

Out-of-Band

BCM3250

Advanced

Single-Chip

Set-Top Box

Front E nd

PCI

Video

BCM7030

High Definition

Video/Graphics

Subsystem

CPU

Video/Audio

Out

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