ADI AD9547网络时钟发生与同步方案

ADI 公司的AD9547是双路/四路输入网络时钟发生器/同步器,能为许多系统包括同步光网络(SONET/SDH)提供同步.输入基准频率从1 kHz 到750 MHz,频率监视1ppm,输出频率高达450MHz,主要应用在网络同步,OC-192的SONET/SDH时钟,无线基站,控制器,有线基础设备和数据通信. 本文介绍了AD9547主要特性, 功能方框图,详细方框图, 输出同步方框图和评估板电路图以及评估板材料清单.

AD9547: Dual/Quad Input Network Clock Generator/Synchronizer

The AD9547 provides synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9547 generates an output clock that is synchronized to one of two differential or four single-ended external input references. The digital PLL allows for reduction of input time jitter or phase noise associated with the external references. The AD9547 continuously generates a clean (low jitter), valid output clock, even when all references fail, by means of digitally controlled loop and holdover circuitry. The AD9547 operates over an industrial temperature range of −40℃ to +85℃.

AD9547主要特性:

Supports Stratum 2 stability in holdover mode

Supports reference switchover with phase build-out

Supports hitless reference switchover

Automatic/manual holdover and reference switchover
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