Overview

Features and Benefits

  • Supports Stratum 2 stability in holdover mode
  • Supports reference switchover with phase build-out
  • Supports hitless reference switchover
  • Automatic/manual holdover and reference switchover
  • 2 pairs of reference input pins, with each pair configurable as a single differential input or as 2 independent single-ended inputs
  • Input reference frequencies from 1 kHz to 750 MHz
  • Reference validation and frequency monitoring (1 ppm)
  • Programmable input reference switchover priority
  • 30-bit programmable input reference divider
  • 2 pairs of clock output pins, with each pair configurable as a single differential LVDS/LVPECL output or as 2 single-ended CMOS outputs
  • Output frequencies up to 450 MHz
  • See data sheet for additional features

Product Details

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 con-tinuously 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.


Applications
  • Network synchronization
  • Cleanup of reference clock jitter
  • SONET/SDH clocks up to OC-192, including FEC
  • Stratum 2 holdover, jitter cleanup, and phase transient control
  • Stratum 3E and Stratum 3 reference clocks
  • Wireless base stations, controllers
  • Cable infrastructure
  • Data communications
  • Product Lifecycle icon-recommended Recommended for New Designs

    This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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    Evaluation Boards Pricing displayed is based on 1-piece.
    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.