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 TxDACÂ® 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-ModeTM 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-ModeTM 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-ModeTM 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
A middle school team from Rochester, Mich., has again nabbed the grand prize in the annual international Future City Competition, which drew students from 37 regions of the United States, as well as from England and China.
The word “smart” is becoming the dumbest word around. It has been applied to almost every device and system in our homes. In addition to smartphones and smart meters, we now hear about smart clothing and smart shoes, smart lights, smart homes, smart buildings, and every trendy city today has its smart city project. Just because it has a computer inside and is connected to the Web, does not mean it is smart.
Are you being paid enough? Do you want a better job? According to a recent survey Manpower released just before Engineers Week, employers and engineers don't see eye-to-eye about the state of US engineers' skills and experience.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.