BCM3034
®
UNIVERSAL ADVANCED DOWNSTREAM MODULATOR
•
Integrated QAMLink Advanced downstream 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 pre-distortion 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 /
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 64K 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

I
2
C or SPI-compatible microcontroller interface
JTAG test interface

128-pin PQFP package

Operates over industrial temperature range (-40 to +85 degrees C)

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:
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
FEATURES SUMMARY OF BENEFITS
5-65 MHzUpstream
BCM3138
BCM3138
Routing/
Classification
Engine
Ethernet
System
CPU
Memory
PCI Bus
BCM3212
CMTS MAC
Downstream
SDRAM
(PHS,
output
queues)
LPFPA
WAN
44 MHz IF
BCM3138
Dual Adv. PHY
Receiver
BCM3034
Advanced QAM
Modulator
Cable Modem Termination System (CMTS) Block Diagram