AD9549

双输入网络时钟发生器/同步器 Dual Input Network Clock Generator/Synchronizer

Product Details

The provides synchronization for many systems, including synchronous optical networks SONET/SDH. The AD9549 generates an output clock, synchronized to one of two external input references. The external references may contain significant time jitter, also specified as phase noise. Using a digitally controlled loop and holdover circuitry, the AD9549 continues to generate a clean low jitter, valid output clock during a loss of reference condition, even when both references have failed.

The AD9549 operates over an industrial temperature range of −40°C to +85°C.

**Applications**

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Network synchronization

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Reference clock jitter cleanup

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SONET/SDH clocks up to OC-192, including FEC

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Stratum 3/3E reference clocks

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Wireless base stations, controllers

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Cable infrastructure

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Data communications

### Features and Benefits

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Flexible reference inputs

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Input frequencies: 8 kHz to 750 MHz

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Two reference inputs

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Loss of reference indicators

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Auto and manual holdover modes

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Auto and manual switchover modes

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Smooth A-to-B phase transition on outputs

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Excellent stability in holdover mode

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Programmable 16 + 1-bit input divider, R

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Differential HSTL clock output

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Output frequencies to 750 MHz

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Low jitter clock doubler for frequencies >

400 MHz

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Please see Data Sheet for additional features.