鈥?/div>
Integrated QAMLink Advanced downstream
modulator
鈥?Supports 4, 16, 32, 64, 128, 256, 512 and 1024 QAM
鈥?Variable symbol rates up to 10 Mbaud
鈥?Programmable 80-tap dual square-root Nyquist filters
鈥?Programmable complex 24-tap T/2 pre-distortion filter
鈥?Digital interpolation filters
鈥?Quadrature direct digital frequency synthesizer and upconverter
鈥?X/sinX filter for DAC distortion compensation
Presents a
鈥?/div>
modulatorshigh-performance, integrated solution for
in digital cable-TV head-end, Cable
鈥?/div>
Modem Termination Systems (CMTS), digital
microwave radio, SMATV and MMDS applications.
An integrated solution that reduces board space and
costs with:
鈥?On-chip 64K static RAM to eliminate external RAM
鈥?Integrated 10-bit DAC with power control
鈥?Additional burst modulator for out-of-band signaling
鈥?Small footprint to enable high-density equipment
Fully integrated ITU-T J.83
鈥?/div>
(DVB/DAVIC/EuroDOCSIS Annex A Annex B
/IEEE802.14),
(DigiCipher II
廬
/SCTE/DOCSIS/IEEE 802.14 and
Annex C (Japan) FEC encoder
鈥?All codes extended to support 512/1024-QAM
鈥?On chip 64K static RAM for interleaving
Improves bandwidth
鈥?/div>
QAM modulation. efficiency through 512/1024-
鈥?Enables advanced digital services over narrow RF channels.
Supports
鈥?/div>
modulatorNorth American, European and Asian
standards enabling a single design for
鈥?/div>
Integrated 10-bit digital-to-analog converter
Integrated additional burst modulator for power
鈥?/div>
management of CPE equipment
Optional
鈥?/div>
DAC 12- or 14-bit digital IF output for external
鈥?/div>
I C or SPI-compatible microcontroller interface
鈥?/div>
JTAG test interface
鈥?/div>
128-pin PQFP package
Operates over
鈥?/div>
degrees C) industrial temperature range (-40 to +85
2
鈥?/div>
鈥?/div>
鈥?/div>
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 deploys in harsh environments.
鈥?Distributed CMTS in Hybrid Fiber Coaxial Fiber Node
Cable Modem Termination System (CMTS) Block Diagram
BCM3138
Dual Adv. PHY
Receiver
BCM3138
BCM3138
5-65 MHzUpstream
Ethernet
Routing/
Classification
Engine
WAN
BCM3212
CMTS MAC
System
CPU
PCI Bus
44 MHz IF
BCM3034
PA
LPF
Advanced QAM
Modulator
Downstream
SDRAM
(PHS,
output
queues)
Memory
BCM3034相關(guān)型號(hào)PDF文件下載
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