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Synthesizers pack nine phase-aligned LVPECL outputs

Posted: 15 Sep 2009 ?? ?Print Version ?Bookmark and Share

Keywords:frequency synthesizer? oscillator? Ethernet?

Maxim Integrated Products has introduced two new low-jitter, frequency synthesizers with nine phase-aligned LVPECL outputs for high-speed systems.

The MAX3671 and MAX3673 devices use a low-noise voltage-controlled oscillator and PLL architecture to generate high-frequency (312.5MHz), low-jitter (0.3psRMS) clock signals from a 62.5MHz reference-clock input. They are configured through three four-level control inputs, and the MAX3671 simultaneously generates two different frequencies for both Ethernet port clocking and MAC clocking. The MAX3673 generates outputs for CPRI/UMTS reference clocking (122.88MHz, 245.76MHz). This capability cuts the need for an expensive high-frequency oscillator and a fanout buffer, thus saving board space and cost.

The MAX3671 is suitable for Ethernet interface applications such as enterprise switches and routers, and the MAX3673 is well suited for wireless base stations that require CPRI reference clocking.

The MAX3671/MAX3673 are fully specified over the -45C to +85C extended temperature range, and operate from 3.3V 5 percent. They are available in a lead-free, 56-pin TQFN package. Prices start at $10.26 (1,000-up, FOB USA). Evaluation kits are available to speed designs.

For application notes on synthesizers click here.

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