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Industry's First 12-Bit, 4.3Gsps RF DAC to Directly Synthesize Four QAM Channels in Cable Downstream Band

12-Bit, 4.3 Gsps Direct RF Synthesis DAC for Cable Downstream Band

Note to Editor: The MAX5881 is a 12-bit, 4.3Gsps digital-to-analog converter (DAC) that is optimized for directly synthesizing RF signals in the cable downstream band. This DAC directly synthesizes four DOCSIS 3.0-compliant QAM channels in the 50MHz to 1000MHz cable downstream band. The 4.3Gsps output update rate and high-performance architecture of the DAC enables this excellent wideband dynamic performance. The MAX5881 is ideal for edge QAM devices and cable modem termination systems (CMTS).

SUNNYVALE, CA—January 15, 2008—Maxim Integrated Products (Pink Sheets: MXIM) introduces the MAX5881, the industry's first 12-bit, 4.3Gsps DAC that can directly synthesize multichannel QAM signals in the 50MHz to 1000MHz cable downstream band. Offering excellent spurious, noise, and adjacent-channel performance, this device meets the requirements of DOCSIS® 3.0 for up to four contiguous channels per RF port. In addition to enabling a fully digital cable upconversion solution, the MAX5881 greatly simplifies the RF portion of the design, thus achieving a lower cost per QAM channel than analog solutions. This simplification eliminates the need for many of the components used in the traditional analog solution, such as an upconversion modulator or mixer, a downconversion mixer, fixed and agile frequency synthesizers, amplifiers, and filters. Providing higher density, lower power, and lower cost per channel than the traditional analog approach, the MAX5881 solution is ideal for DOCSIS 3.0-compliant edge QAM devices and cable modem termination systems (CMTS).

The MAX5881 operates from 3.3V and 1.8V supplies, and consumes 1.2W at 4.0Gsps. Fully specified over the 0°C to +70°C commercial temperature range, it is offered in a compact, 11mm x 11mm, RoHS-compliant, 169-ball CSBGA package. Contact the factory for pricing.