AD9549 Dual Input Network Clock Generator/Synchronizer

Product Details

The AD9549 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

  • Network synchronization
  • Reference clock jitter cleanup
  • SONET/SDH clocks up to OC-192, including FEC
  • Stratum 3/3E reference clocks
  • Wireless base stations, controllers
  • Cable infrastructure
  • Data communications

Features and Benefits

  • Flexible reference inputs
  • Input frequencies: 8 kHz to 750 MHz
  • Two reference inputs
  • Loss of reference indicators
  • Auto and manual holdover modes
  • Auto and manual switchover modes
  • Smooth A-to-B phase transition on outputs
  • Excellent stability in holdover mode
  • Programmable 16 + 1-bit input divider, R
  • Differential HSTL clock output
  • Output frequencies to 750 MHz
  • Low jitter clock doubler for frequencies >
    400 MHz
  • Please see Data Sheet for additional features.