ANALOG DEVICES’ PROGRAMMABLE CLOCK GENERATORS SIMPLIFY SYSTEM DESIGN AND REDUCE CLOCKING COMPONENT COUNT

ADI’s AD9520/2 multi-output clock generators deliver a high-quality clock signal and flexible outputs, while on-chip memory reduces system start-up programming requirements.
AD9520

Norwood, MA (09/29/2008) - Analog Devices, Inc. (ADI), a world leader in semiconductors for signal processing applications, today introduced a pair of clock-generation and distribution ICs with the industry’s best combination of device integration, low-noise, low-jitter performance and signal output flexibility. The AD9520 and AD9522 multi-output clock generators include a 512-byte embedded EEPROM memory block, affording system engineers a programmable clock solution that can serve as both the source and system clock. By programming their own specific set of output conditions using the on-chip memory, designers can easily configure the AD9520/2 as the source clock to ensure initial processing functions are synchronized when the system is powered on or reset. Competing clock ICs require a separate source clock, which must be independently matched to the system processor or microcontroller in order to program the system clock chip, adding component count, cost and complexity to network line cards, wireless and broadband infrastructure, medical imaging, and data converter clocking designs.

”Outstanding jitter performance was the primary reason TruePosition chose the AD9520 for use in our third-generation wireless location measurement unit,” said Alan Larrabee, vice president of research and development for TruePosition. “The AD9520 has a versatile multiple output architecture, integrated PLL, and on chip EEPROM, which provide an elegant solution for sampling clock generation and distribution.”

In addition to the on-chip EEPROM and PLL (phase-locked loop), the AD9520/2 integrates dividers, fanout buffers, and a VCO (voltage-controlled oscillator) that tunes from 1.4 GHz to 2.95 GHz. An external 3.3-V/5-V VCO/VCXO (voltage-controlled crystal oscillator) of up to 2.4 GHz also can be used. The PLL/VCO clock-generation circuitry boasts industry leading phase noise of -150dBc/Hz at a 10 kHz offset on a 200-MHz clock signal, while the clock distribution fanout channels feature ultra-low wideband jitter performance of 225 femtoseconds.

Two reference inputs allow glitch-free switchover for applications requiring redundant references, while a PLL holdover mode maintains the output frequency in the event of a lost reference signal. Zero delay operation is available to ensure precise phase alignment between inputs and outputs. The AD9520 offers 12 differential LVPECL (low-voltage positive emitter-coupled logic) outputs in four groups, each with a 1 to 32 divider and phase delay. The AD9522 includes 12 differential LVDS (low-voltage differential signaling) outputs. Both devices alternatively offer up to 24 single-ended CMOS output configurations up to 250 MHz.

Availability and Pricing
The AD9520 is available now in production quantities. The AD9522 is available for sampling and will be released in October. The AD9520 and AD9522 come in a 64-lead LFCSP (lead-frame chip-scale package) and are priced at $12.65 per unit in 1,000-unit quantities. For more information, visit http://www.analog.com/AD9520.

About TruePosition
TruePosition (http://www.trueposition.com) is one of the world's leading providers of complete, wireless location solutions for the personal and public safety and government security markets. The company's high-performance, turnkey and managed solutions include positioning technologies, applications, integration services, and technical support. These solutions meet demanding location requirements, including U.S. E-911 and other emergency calling directives worldwide. TruePosition subsidiaries include Useful Networks, a location aggregator, and Zoombak, a consumer applications developer. Founded in 1993 and headquartered in the Philadelphia, PA (USA) area, TruePosition is owned by Liberty Media Corporation.

About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices is included in the S&P 500 Index.

Editor's Contact Information:

Bob Olson
781-937-1666

bob.olson@analog.com

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