bcm3040 Broadcom Corp., bcm3040 Datasheet
bcm3040
Manufacturer Part Number
bcm3040
Description
Bcm3040 - Universal Docsis 2.0-based Downstream Modulator
Manufacturer
Broadcom Corp.
Datasheet
1.BCM3040.pdf
(2 pages)
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Integrated QAMLink
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 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/EuroDOCSIS
IEEE 802.14), Annex B (DigiCipher II
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-bit or 14-bit digital IF output for external DAC
Broadcom Serial Control (BSC) or SPI-compatible microcontroller
interface
JTAG test interface
128-pin PQFP package
Operates over industrial temperature range (–40°C to +85°C)
UNIVERSAL ADVANCED DOCSIS
F E A T U R E S
®
Advanced DOCSIS
Cable Modem Termination System (CMTS) Block Diagram
44-MHz IF
®
PA
®
/SCTE/DOCSIS/IEEE
LPF
®
Dual DOCSIS ® 2.0
2.0 downstream
BCM3140
Dual DOCSIS ® 2.0
Receiver
BCM3140
Dual DOCSIS ® 2.0
Receiver
QAM Modulator
BCM3040
DOCSIS ® 2.0
BCM3140
Receiver
BCM3214
DOCSIS ® 2.0
MAC
™
/
(PHS, Output
Downstream
Queues)
SDRAM
BCM3040
®
Ethernet
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2.0 DOWNSTREAM MODULE
Presents a high-performance, integrated solution for modulators in
digital cable TV headend, 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 64-KB 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 simplify image
rejection filters
Programmable high-granularity digital output options remove the
need for SAW filters in the final RF stage while providing designers
multiple options in DAC selection
Advanced functions ease deployments in harsh environments
• Distributed CMTS in Hybrid Fiber Coaxial Fiber Node
Classification
Routing/
Engine
S U M M A R Y O F B E N E F I T S
Memory
System
CPU
WAN
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bcm3040 Summary of contents
Page 1
... BCM3140 Dual DOCSIS ® 2.0 Receiver BCM3140 Dual DOCSIS ® 2.0 Receiver Ethernet Routing/ Classification Engine BCM3214 DOCSIS ® 2.0 MAC Downstream SDRAM (PHS, Output LPF Queues) BCM3040 DOCSIS ® 2.0 QAM Modulator WAN System CPU Memory ...
Page 2
... BCM3040 features an advanced downstream QAM modulator that includes an extended ITU-T J.83 Annex A/B/C FEC encoder, an all- digital QAM modulator supporting up to 1024 QAM, and an integrated 10-bit DAC with power control. Additionally, the BCM3040 includes a second modulator that can be used for out-of-band signaling or CPE power control. ...