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双/四输入网络时钟发生器/同步器ad9547数据表
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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°C to +85°C.
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