BCM3034 Datasheet, PDF (1/2 Pages) Broadcom Corporation. – UNIVERSAL ADVANCED DOWNSTREAM MODULATOR

BCM3034
®
UNIVERSAL ADVANCED DOWNSTREAM MODULATOR
FEATURES
SUMMARY OF BENEFITS
• ^{Integrated QAMLink Advanced downstream modulator}
• Supports 4, 16, 32, 64, 128, 256, 512 and 1024 QAM
• Variable symbol rates up to 10 Mbaud
• Programmable 80-tap dual square-root Nyquist filters
• Programmable complex 24-tap T/2 pre-distortion filter
• Digital interpolation filters
• Quadrature direct digital frequency synthesizer and upconverter
• X/sinX filter for DAC distortion compensation
• ^{Fully integrated ITU-T J.83 Annex A (DVB/DAVIC/EuroDOCSIS /}
IEEE802.14), Annex B (DigiCipher II®/SCTE/DOCSIS/IEEE 802.14
and Annex C (Japan) FEC encoder
• All codes extended to support 512/1024-QAM
• On chip 64K static RAM for interleaving
• ^{Integrated 10-bit digital-to-analog converter}
• ^{Integrated additional burst modulator for power management of CPE}
equipment
• ^{Optional 12- or 14-bit digital IF output for external DAC}
• ^{I2C or SPI-compatible microcontroller interface}
• JTAG test interface
• ^{128-pin PQFP package}
• ^{Operates over industrial temperature range (-40 to +85 degrees C)}
• ^{Presents a high-performance, integrated solution for modulators in}
digital cable-TV head-end, Cable Modem Termination Systems
(CMTS), digital microwave radio, SMATV and MMDS applications.
• ^{An integrated solution that reduces board space and costs with:}
• On-chip 64K static RAM to eliminate external RAM
• Integrated 10-bit DAC with power control
• Additional burst modulator for out-of-band signaling
• Small footprint to enable high-density equipment
• ^{Improves bandwidth efficiency through 512/1024-QAM modulation.}
• Enables advanced digital services over narrow RF channels.
• ^{Supports North American, European and Asian modulator standards}
enabling a single design for worldwide application.
• ^{Programmable analog IF outputs up to 100 MHz simplifies image}
rejection filters.
• ^{Programmable high-granularity digital output options remove the}
need for SAW filters in final RF stage while providing designers
multiple options in DAC selection.
• ^{Advanced functions deploy in harsh environments.}
• Distributed CMTS in Hybrid Fiber Coaxial Fiber Node
BCM3138
Dual Adv. PHY
Receiver
BCM3138
BCM3138
44 MHz IF
PA
BCM3212
Ethernet
Routing/
Classification
Engine
WAN
CMTS MAC
System
CPU
Downstream
BCM3034 ^SDRAM
LPF
Advanced QAM
(PHS,
output
Modulator
queues)
Memory
Cable Modem Termination System (CMTS) Block Diagram