Synthesizer with spread spectrum cuts EMI in clock trees

Maxim Integrated Products' MAX9492 is a high-performance, low-jitter frequency synthesizer designed to reduce EMI while generating multiple clocks for distribution in network routers or switches. This integrated design replaces two to three devices currently required to perform the same function, thereby reducing overall system cost.

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The MAX9492 provides six low-jitter outputs, one of which is the buffered output of the reference clock. The other five outputs are independently programmable to generate all clock frequencies required in a network or storage linecard: 133, 125, 83, 66, 62.5, 50, 33, and 25 MHz. The device's spread-spectrum capability spreads the fundamental energy over a wider frequency range and, hence, reduces electromagnetic interference. The output frequency spectrum is down-spread by -2.5% or -1.25%.

The MAX9492 is available in a 20-pin TQFN package. The device operates from a single +3.3 V supply and operates over the extended temperature range (-40 °C to +85 °C). Prices start at $3.35, in 1000 pieces and up.

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© 2012 Penton Media Inc.


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