Analog Devices AD9789 14-bit TxDAC® Digital-to-Converter

DN Staff

April 10, 2010

2 Min Read
Analog Devices AD9789 14-bit TxDAC® Digital-to-Converter

The AD9789 is an enabling technology in thecable infrastructure industry. It was the first product to enable a "direct toRF" architecture, while also including the signal processing to enable lowercost and shorter time to market. The AD9789 eliminates the requirement for anIF stage, thereby eliminating a discrete low pass filter and mixer or modulatorstage. To the cable operators, this means higher density, lower power andultimately lower cost per QAM. Developed for broadband and next-generation-communications-equipmentdesigners, the AD9789 14-bit TxDACA(R) converter streamlines widebandcommunications design, enabling wireless and broadband equipment engineers tosupport multiple standards using a single direct-to-RF transmit core. The AD9789 features ADI's proprietaryMix-ModeTM super-Nyquist architecture, a single transmit-DAC architecture thatdelivers a combination of usable bandwidth and effective dynamic range todeliver high-fidelity digital synthesis of RF signals up to 3.6 GHz. The TxDACcombines a flexible QAM encoder, interpolator, and upconverter with ahigh-performance 14-bit, 2400-Msps RF DAC to achieve a 2.4GHz sample rate,making well suited for DOCSIS-III cable-infrastructure designs that uselow-cost FPGAs. The AD9789 streamlines wideband communications design, allowingwireless and broadband equipment engineers to support multiple standards usinga single direct-to-RF transmit core. The new TxDAC shortens time-to-market forDOCSIS-III cable-infrastructure designs using low-cost FPGAs and includes aflexible digital interface that can accept up to four channels of complex data.For applications requiring output frequencies beyond the first nyquist zone,the AD9789 proprietary Mix-ModeTM super-Nyquist architecture provides multi-carriercapability up to the Nyquist frequency in baseband mode and uses the mix-modefunction to generate RF signals in the second and third Nyquist zones. Thisfeature allows designers to eliminate a mixing stage, reducing component countand design complexity in direct-RF applications. According to the company, theAD9789 was the first product of its kind to provide a direct to RF frequencysignal for the cable industry. It is an RF DAC that is able to convert bits tothe desired RF frequency. This breakthrough technology eliminates a number ofcomponents typically found in the signal chain including mixers or modulatorsand filters. Leveraging ADI's proprietary Mix-ModeTM super-Nyquist architecture,the AD9789 delivers a combination of usable bandwidth, effective dynamic rangeand a direct-to-RF core that supports multiple broadband equipmentcommunications standards.

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