Out in Front: May 23, 1996
The 125-MHz AD9850 from Analog Devices, a numerically controlled oscillator (NCO), is a direct digital synthesizer (DDS) and clock generator. It includes an integral high-speed, 10-bit D/A converter and comparator. This combination yields high integration and performance along with low power consumption. The all-CMOS device operates from a 3.3 or 5V supply and consumes 280 mW at the lower voltage. The AD9850 has a 32-bit tuning word and a 42-MHz programmable output-frequency range. It can digitally shift the output frequency or phase as many as 23 million times/sec. The controlling processor loads data via five sequential 8-bit parallel words or a serial 40-bit format. Spurious-free dynamic range is greater than 50 dB for a 42-MHz sine-wave output and greater than 60 dB for a 10-MHz output. The AD9850 comes in a 28-lead SSOP and costs $9.95 (10,000). Two versions of an evaluation board and supporting Windows-based software are also available.—by Bill Schweber
Analog Devices Inc, Norwood, MA. (617) 937-1428, http://www.analog.com.