BCM3037 Datasheet, PDF (1/2 Pages) Broadcom Corporation. – BCM3037 QAMLINK-R UNIVERSAL BURST MODULATOR

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