UNIVERSAL ADVANCED DOWNSTREAM MODULATOR
The BCM3034 QAMLink Universal Modulator is a highly integrated solution that significantly decreases the board space and cost of modulators in digital cable-TV head-ends, digital cable modem head-ends, digital microwave radio, SMATV and MMDS applications. The BCM3034 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 BCM3034 includes a second modulator that can be used for out-of-band signaling or CPE power control.
FEATURES
• 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
• I2C or SPI-compatible microcontroller interface
• JTAG test interface
• 128-pin PQFP package
• Operates over industrial temperature range (-40 to +85 degrees C)