Analog Devices Inc.

Category: Integrated Circuits (ICs)

The MAX5862 is an integrated, high-density, downstreamcable QAM modulator, digital upconverter (DUC) andRF digital-to-analog converter (RF-DAC). The deviceperforms QAM mapping, pulse shaping and digital RFupconversion of forward-error-correction (FEC) encodeddata with full agility and drives a single RF-port using a14-bit 4.6Gsps DAC. The device digitally synthesizes RFsignals with up to 32 DOCSIS-compliant 6MHz QAM or8MHz QAM channels. The device has fixed QAM capacityand provides high-density QAM modulation with very lowpower dissipation (4.2W at 32 QAMs) in a compact 12mmx 17mm footprint.The device accepts FEC-encoded CMOS data (symbols)on a single 10-bit input port that accepts up to 32 time-interleaveddigital data streams. Each channel features an individuallyconfigurable QAM mapper, RRC filter, and arbitraryrate resampler (ARR). The device performs pulse shaping,resampling, interpolation and quadrature modulation of inputdata, supporting all data rates defined in DOCSIS 3.0 andDVB-C. A cascade of interpolation filters, complex modulators,and channel combiners allow modulation of the signalto any frequency from 47MHz to 1006MHz. Integrated directdigital frequency synthesizers allow positioning of the QAMchannels with a resolution of 125Hz. The interpolation filtersand resamplers provide linear phase and excellent gain flatness.Output data from the last modulator is fed to a digital-predistortion(DPD) block that can be used to correct distortionin the device’s integrated RF-DAC and output amplifiersexternal to the device.ApplicationsEdge QAM, CMTS, CCAP, IP-QAMMulti-Dweller Unit Mini-HeadendsRemote PHY, Coax Media Converters

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