BCM3034
®
UNIVERSAL ADVANCED DOWNSTREAM MODULATOR
FEATURES
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Integrated QAMLink Advanced downstream modulator
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Supports 4, 16, 32, 64, 128, 256, 512 and 1024 QAM
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Variable symbol rates up to 10 Mbaud
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Programmable 80-tap dual square-root Nyquist filters
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Programmable complex 24-tap T/2 pre-distortion filter
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Digital interpolation filters
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Quadrature direct digital frequency synthesizer and upconverter
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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
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All codes extended to support 512/1024-QAM
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On chip 64K static RAM for interleaving
Integrated 10-bit digital-to-analog converter
Integrated additional burst modulator for power management of CPE
equipment
SUMMARY OF BENEFITS
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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:
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On-chip 64K static RAM to eliminate external RAM
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Integrated 10-bit DAC with power control
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Additional burst modulator for out-of-band signaling
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Small footprint to enable high-density equipment
Improves bandwidth efficiency through 512/1024-QAM modulation.
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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.
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Distributed CMTS in Hybrid Fiber Coaxial Fiber Node
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Optional 12- or 14-bit digital IF output for external DAC
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I
2
C or SPI-compatible microcontroller interface
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JTAG test interface
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128-pin PQFP package
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Operates over industrial temperature range (-40 to +85 degrees C)
BCM3138
Dual Adv. PHY
Receiver
BCM3138
BCM3138
5-65 MHzUpstream
Ethernet
Routing/
Classification
Engine
WAN
BCM3212
CMTS MAC
System
CPU
PCI Bus
Downstream
SDRAM
(PHS,
output
queues)
44 MHz IF
BCM3034
PA
LPF
Memory
Advanced QAM
Modulator
Cable Modem Termination System (CMTS) Block Diagram
BOARDCOM [ Broadcom Corporation. ]
