BCM3040 View Datasheet(PDF) - Broadcom Corporation
Part Name
Description
Manufacturer
BCM3040 Datasheet PDF : 2 Pages
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BCM3040
®
UNIVERSAL ADVANCED DOCSISTM 2.0 DOWNSTREAM MODULATOR
FEATURES
• Integrated QAMLink® Advanced DOCSISTM 2.0 downstream
modulator
• Supports 4, 16, 32, 64, 128, 256, 512 and 1024 QAM
• Variable symbol rates up to 10 Megabaud
• Programmable 80-tap dual square-root Nyquist filters
• Programmable complex 24-tap T/2 predistortion 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/EuroDOCSISTM /
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 64 KB 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)
SUMMARY OF BENEFITS
• Presents a high-performance, integrated solution for modulators in
digital cable-TV head-end, DOCSIS 2.0 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
BCM3140
Dual DOCSIS 2.0
Receiver
BCM3140
BCM3140
44 MHz IF
PA
BCM3214
Ethernet
Routing/
Classification
Engine
WAN
DOCSIS 2.0 MAC
System
CPU
BCM3040
Downstream
SDRAM
LPF
DOCSIS 2.0 QAM
(PHS,
output
Modulator
queues)
Memory
Cable Modem Termination System (CMTS) Block Diagram
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