[Orion] ADI9852

[Bill Tippett]

AD9852 - CMOS 300 MHz Complete-DDS Synthesizer

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  Product Description
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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.