BCM3040

Features:

• Integrated QAMLink® Advanced DOCSISTM 2.0 downstream modulator
• Supports 4, 16, 32, 64, 128, 256, 512 and 1024 QAM
• Variable symbol rates up to 10 Megabaud
• 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/EuroDOCSISTM /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 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- or 14-bit digital IF output for external DAC
• I²C or SPI-compatible microcontroller interface
• JTAG test interface
• 128-pin PQFP package
• Operates over industrial temperature range (40 to +85 C)




Description

The BCM3040 QAMLink® universal modulator is a highly integrated solution that decreases the board space and cost of modulators in DOCSIS 2.0-based CMTS applications. The 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 D/A converter with power control. Additionally, the BCM3040 includes a second modulator that can be used for out-of-band signaling or CPE power control.

The BCM3040 combined with the BCM3140 QAMLink Burst Receiver and BCM3214 QAMLink CMTS MAC provides a complete solution for advanced DOCSIS 2.0-based cable headend equipment.