Direct digital synthesizer with spur-reduction channels offers improved dynamic range

Norwood, Mass. — Designed for test and measurement equipment, wireless base stations, and secure communications devices, Analog Devices' AD9912 direct digital synthesizer (DDS) provides a spurious-free dynamic range (SFDR) performance with output signals up to 400 MHz, while consuming less than 1000 mW. This level of performance is attainable by using “spur-reduction” channels to knock down the two largest harmonic spurs by up to 10 dB. This helps ease design efforts and enables engineers to spend less time frequency planning, especially in applications such as military receivers, where every last dB is important to maintain critical system functions. The spur-reduction capability expands the benefits of DDS into designs where previous wideband SFDR performance was a limiting factor.

The AD9912 is a 1 Gsamples/s DDS device featuring an integrated 14-bit digital-to-analog converter (DAC) and 3.6 microHertz tuning resolution on outputs up to 400 MHz. The AD9912 also features a differential HSTL (high-speed transceiver logic) comparator for clock generation. With a flexible system clock input, the DDS will also accept either a crystal or external clock. An on-chip, low-noise PLL (phase-lock loop) reference clock multiplier allows reference clocks as low as 25 MHz. The AD9912 has auxiliary DDS channels which can be programmed to reduce the magnitude of problematic harmonic spurs in its output spectrum.

Availability: Samples available
Pricing: $37.25 each in 1,000-piece quantities
Data Sheets: AD9912 DDS

Analog Devices, 800-262-5643,

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