PLL Synthesizer targets wireless communication systems.

Press Release Summary:

Model ADF4157 Fractional-N PLL synthesizer operates up to 6 GHz using power supply ranging from 2.7-3.3 V and can be powered down when not in use for current reduction from 23 mA to 0.01 mA. It consists of low-noise digital phase-frequency detector, precision high-voltage charge pump, programmable reference divider, programmable charge pump currents, and 25-bit fixed-modulus fractional divider. Three-wire interface controls all on-chip registers.

Original Press Release:

Analog Devices RF Portfolio Expansion Continues with New High-Resolution PLL for Wireless Applications

With the industry's finest resolution, ADI's ADF4157 Fractional-N PLL synthesizer improves performance while reducing design cost and complexity in wireless infrastructure, satellite and radio systems.

Norwood, MA(10/8/2007) - Analog Devices, Inc. (NYSE: ADI), a global leader in high-performance semiconductors for signal processing applications, today announced the ADF4157, a new high frequency, fractional-N PLL synthesizer for applications that require low phase noise and ultra-fine-tuning resolution, such as satellite communications, private mobile radios (PMR), instrumentation and wireless base station equipment, including those that support GSM, PCS, DCS, WiMAX, CDMA and W-CDMA networks. The 25-bit fixed-modulus divider provides for ultra-fine frequency resolution. Design and simulation software, which greatly simplifies and streamlines loop filter design, is available free of charge as a download from Analog Devices' Web site at

"ADI's PLL synthesizer portfolio now spans from 5-MHz to 8-GHz with more than 5 new PLLs released in the last year," said David Boylan, business director, RF Limerick, Analog Devices, Inc. "The PLLs are supported by the ADIsimPLL simulation design aid, which thousands of wireless systems designers are now using to speed their synthesizer developments."

Analog Devices will showcase the ADF4157 at the European Microwave Conference, Oct. 8 - 12 in Munich, Germany (Booth #946), together with other innovations from ADI's broad RF portfolio for applications including, wireless infrastructure, instrumentation, satellite communications and broadband access.

More about the ADF4157
The ADF4157 operates up to 6-GHz using a power supply ranging from 2.7 V to 3.3 V. The device can be powered down when not in use, resulting in overall system current reduction from 23 mA to 0.01 mA. The ADF4157 consists of a low-noise digital phase-frequency detector (PFD), a precision high-voltage charge pump, a programmable reference divider, programmable charge pump currents and a 25-bit fixed-modulus fractional divider. Additionally, the RF output phase is programmable for applications that require a particular phase relationship between the output and the reference. A simple three-wire interface controls all of the on-chip registers. The ADF4157 also features separate VP for extended VCO tuning voltage and a digital lock-detect function. The ADF4157 is fully pin-compatible with the ADF411x, ADF410x and ADF415x PLL synthesizers from Analog Devices.

Pricing and Availability
The ADF4157 is available in two package options, a 20-lead LFCSP (lead-frame chip-scale package) and a 16-lead TSSOP (thin-shrink small-outline package), and is priced at $3.21 per unit in quantities of 1,000. For more information, visit

ADI in Radio Frequency ICs
Using a unique combination of design skills, process technologies, and system understanding, Analog Devices offers a broad portfolio of RF ICs, including complete chipsets and a full range of high-performance RF function blocks. ADI's extensive offerings include: direct digital synthesizers (DDS); phase-locked loop synthesizers (PLLs); detectors and logarithmic amplifiers; X-AMP® fixed- and variable-gain amplifiers (VGAs); TruPwr(TM) RF power detectors; mixers, modulators and demodulators; integrated IF amplifiers; transceivers and transmitters for short range devices.

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. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' common stock is listed on the New York Stock Exchange under the ticker "ADI" and is included in the S&P 500 Index.

1 ADIsimPLL(TM) is a trademark of Analog Devices, Inc. All other trademarks included herein are the property of their respective owners.

© 1995-2007 Analog Devices, Inc. All Rights Reserved

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