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CMOS 300 MHz Complete-DDS Synthesizer The AD9852 digital synthesizer is a highly integrated device that uses advanced DDS technology, coupled with (2) internal highspeed, high performance D/A converters and comparator to form a digitally-programmable synthesizer function. When referenced to an accurate clock source, the AD9852 generates a highly stable, frequency, phase and amplitude programmable sine wave output that can be used as an agile L.O. in communications, radar, and many other applications. The AD9852's innovative high-speed DDS core provides a 48-bit frequency tuning word, which results in an output tuning resolution of 1 micro-Hertz, for a 300 MHz internal reference clock input. The AD9852's circuit architecture allows the generation of an output sine wave at up to 150 MHz, which can be digitally tuned at a rate of up to 100 million new frequencies per second. The (externally filtered) sine wave output can be converted to a square wave by the internal comparator for agile clock generator applications. The device provides 14-bits of digitally-controlled phase modulation and single-pin PSK. The on-board 12-bit DDS DAC, coupled with the innovative DDS architecture, provides excellent wideband and narrowband output SFDR. When configured with the onboard comparator, the 12-bit control DAC facilitates pulse-width modulation (PWM) and static duty cycle control, in the highspeed clock generator application. A 12-bit digital multiplier permits programmable amplitude modulation, shaped on-off keying and precise amplitude control of the DDS DAC output. The AD9852’s programmable 4x - 20x REFCLK Multiplier circuit generates the 300 MHz (maximum) clock internally from a lower frequency external reference clock. This saves the user the expense and difficulty of implementing a 300 MHz clock source. Direct 300 MHz (maximum) clocking is also accommodated with either single-ended or differential inputs. Single-pin conventional FSK and the enhanced spectral qualities of “ramped†FSK are supported. The AD9852 uses advanced .35 micro CMOS technology to provide this high level of functionality on a single +3.3 V supply. (all content is the responsibility of the poster) |
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