Direct digital synthesizers enhanced

28 January 2004 Telecoms, Datacoms, Wireless, IoT Products & Solutions

A new family of direct digital synthesizers (DDS) delivers a 400 MHz clock speed at one-tenth the power consumption of previous solutions, says manufacturer, Analog Devices. This enables designers to use DDS for fast frequency hopping at higher output frequencies in more power-sensitive applications. DDS, the technique of digitally creating and manipulating sine waves (or other continuous wave forms), in the digital domain, is the preferred technology for applications requiring superior digital frequency agility, output phase control, and phase noise performance. These devices clock at 400 MSPS and synthesize frequencies up to 160 MHz while dissipating less than 200 mW. Lower power dissipation allows multiple chips to be used on a single PCB with less concern for thermal issues. Additional features: an integrated 14-bit DAC, on-chip RAM, phase offset and amplitude control, and multichip synchronisation. The four chips have these feature sets: AD9951- basic DDS with on-board 14-bit DAC; AD9952- with high-speed comparator; AD9953- with RAM (allows nonlinear phase/frequency sweeping); AD9954- with high-speed comparator, RAM, and automatic linear frequency sweep.

Analog Data Products, 011 809 6100

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