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

The AD9789 is an enabling technology in the cable infrastructure industry. It was the first product to enable a "direct to RF" architecture, while also including the signal processing to enable lower cost and shorter time to market. The AD9789 eliminates the requirement for an IF stage, thereby eliminating a discrete low pass filter and mixer or modulator stage. To the cable operators, this means higher density, lower power and ultimately lower cost per QAM. Developed for broadband and next-generation-communications-equipment designers, the AD9789 14-bit TxDACA(R) converter streamlines wideband communications design, enabling wireless and broadband equipment engineers to support multiple standards using a single direct-to-RF transmit core. The AD9789 features ADI's proprietary Mix-Mode^TM super-Nyquist architecture, a single transmit-DAC architecture that delivers a combination of usable bandwidth and effective dynamic range to deliver high-fidelity digital synthesis of RF signals up to 3.6 GHz. The TxDAC combines a flexible QAM encoder, interpolator, and upconverter with a high-performance 14-bit, 2400-Msps RF DAC to achieve a 2.4GHz sample rate, making well suited for DOCSIS-III cable-infrastructure designs that use low-cost FPGAs. The AD9789 streamlines wideband communications design, allowing wireless and broadband equipment engineers to support multiple standards using a single direct-to-RF transmit core. The new TxDAC shortens time-to-market for DOCSIS-III cable-infrastructure designs using low-cost FPGAs and includes a flexible 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-Mode^TM super-Nyquist architecture provides multi-carrier capability up to the Nyquist frequency in baseband mode and uses the mix-mode function to generate RF signals in the second and third Nyquist zones. This feature allows designers to eliminate a mixing stage, reducing component count and design complexity in direct-RF applications. According to the company, the AD9789 was the first product of its kind to provide a direct to RF frequency signal for the cable industry. It is an RF DAC that is able to convert bits to the desired RF frequency. This breakthrough technology eliminates a number of components typically found in the signal chain including mixers or modulators and filters. Leveraging ADI's proprietary Mix-Mode^TM super-Nyquist architecture, the AD9789 delivers a combination of usable bandwidth, effective dynamic range and a direct-to-RF core that supports multiple broadband equipment communications standards.


For more information: http://www.analog.com/pr/AD9789