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Product category: Communications ICs (Wireless)
News Release from: Analog Devices | Subject: ADF4108
Edited by the Electronicstalk Editorial Team on 14 June 2006

PLL synthesiser runs up to 8GHz

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The industry's first 8GHz phase-locked loop synthesiser can eliminate the need for frequency doublers, thereby simplifying the system architecture and reducing system cost

Furthering its commitment to innovation in wireless and RF IC design, Analog Devices has announced the industry's first 8GHz phase-locked loop (PLL) synthesiser. The new ADF4108 is targeted at high-frequency wireless systems, such as those used for broadband wireless access, satellite communications, instrumentation, wireless LANs and basestations for wireless radio.

Because of its high-frequency operation, the ADF4108 can eliminate the need for frequency doublers, thereby simplifying the system architecture and reducing system cost.

'ADI's RF and wireless engineering efforts are built on an allegiance to innovation, quality and solving the signal processing challenges of its customers', said Christian Kermarrec, Vice President, RF and Wireless Systems, Analog Devices: 'The ADF4108 is the latest example of how we continue to develop products that ease wireless system design while maintaining high performance'.

The new ADF4108 will be showcased at this year's IEEE MTT-S International Microwave Symposium taking place until 16th June in San Francisco, California.

On display at ADI's booth (2209) will be the latest innovations from the company's broad portfolio of RF ICs and technologies for applications including cellular terminals and infrastructure, wireless instrumentation, broadband wireless access, and more.

The ADF4108 deepens Analog Devices' broad range of RF ICs and technologies, which includes direct digital synthesisers; PLL synthesisers; detectors and logarithmic amplifiers; fixed and variable gain amplifiers; mixers, modulators, and demodulators; integrated IF amplifiers; RF transmitters and transceivers, and the Othello family of single-chip transceivers for cellular terminals.

Analog Devices also offers ADIsimPLL, the industry's most comprehensive PLL circuit design and evaluation tool, and ADIismLink, a development tool for users of Analog Devices' ISM band transceivers for short range wireless connectivity.

Operating at 8GHz, the ADF4108 is the highest frequency PLL synthesiser currently available on the market.

The device can be used to implement local oscillators in the up-conversion and down-conversion sections of wireless receivers and transmitters.

It consists of a low-noise digital PFD (phase frequency detector), a precision charge pump, a programmable reference divider, programmable A (6bit) and B (13bit) counters, and a dual-modulus prescaler (P/P + 1).

The A and B counters, in conjunction with the dual-modulus prescaler, implement an N divider (N = BP+A).

In addition, the 14bit reference counter (R counter) allows selectable input frequencies at the PFD input.

The ADF4108 has a power supply range of 3.2-3.6V and a separate charge pump supply (VP) allows extended tuning voltage in 3.3V systems.

A complete PLL can be implemented if the synthesiser is used with an external loop filter and voltage controlled oscillator.

The ADF4108 is available now in a LFCSP (lead-frame chip scale package) and is priced at $3.30 per unit in quantities of 1000.

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