The BCM3040 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 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.

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 degrees C)