鈥?/div>
modulatorshigh-performance, integrated solution for
in digital cable-TV head-end, DOCSIS 2.0
cable modem termination systems (CMTS), digital
microwave radio, SMATV and MMDS applications.
鈥?Supports 4, 16, 32, 64, 128, 256, 512 and 1024 QAM
鈥?Variable symbol rates up to 10 Megabaud
鈥?Programmable 80-tap dual square-root Nyquist filters
鈥?Programmable complex 24-tap T/2 predistortion filter
鈥?Digital interpolation filters
鈥?Quadrature direct digital frequency synthesizer and upconverter
鈥?X/sinX filter for DAC distortion compensation
鈥?/div>
An integrated solution that reduces board space and
costs with:
鈥?On-chip 64 KB 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
/IEEE802.14), Annex B
TM
(DigiCipher II /SCTE/DOCSIS/IEEE 802.14 and
Annex C (Japan) FEC encoder
鈥?All codes extended to support 512/1024-QAM
鈥?On chip 64 KB static RAM for interleaving
廬
Improves bandwidth
鈥?/div>
QAM modulation. efficiency through 512/1024-
鈥?Enables advanced digital services over narrow RF channels.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
I
2
C or SPI-compatible microcontroller interface
JTAG test interface
128-pin PQFP package
Operates over industrial temperature range (鈥?0擄 to
+85擄 C)
Supports
鈥?/div>
modulatorNorth American, European and Asian
standards enabling a single design for
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.
deploys in harsh environments.
鈥?/div>
Advanced functions
hybrid fiber coaxial fiber node.
鈥?Distributed CMTS in
Cable Modem Termination System (CMTS) Block Diagram
5-65 MHzUpstream
BCM3140
Dual DOCSIS 2.0
Receiver
BCM3140
BCM3140
Ethernet
Routing/
Classification
Engine
WAN
BCM3214
DOCSIS 2.0 MAC
System
CPU
PCI Bus
Downstream
SDRAM
(PHS,
output
queues)
44 MHz IF
BCM3040
PA
LPF
Memory
DOCSIS 2.0 QAM
Modulator
BCM3040相關(guān)型號PDF文件下載
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