Features and Benefits

  • Supports Stratum2 stability in holdover mode
  • Supports reference switchover with phase build-out
  • Supports hitless reference switchover
  • Auto/manual holdover and reference switchover
  • 4 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 Hz to 750 MHz
  • Reference validation and frequency monitoring (1ppm)
  • Programmable input reference switchover priority
  • Please see data sheet for additional features.

Product Details

The AD9548 provides synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9548 generates an output clock synchronized to one of up to four differential or eight single-ended external input references. The digital PLL allows for reduction of input time jitter or phase noise associated with the external references. The AD9548 continuously generates a clean (low jitter), valid output clock even when all references have failed by means of a digitally controlled loop and holdover circuitry.

The AD9548 operates over an industrial temperature range of −40°C to +85°C.


  • Network synchronization
  • Cleanup of reference clock jitter
  • GPS 1 pulse per second synchronization
  • 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.

Evaluation Kits (2)

Documentation & Resources

  • View All (14)
  • Data Sheet (1)
  • Application Note (4)
  • User Guide (1)
  • Frequently Asked Question (1)
  • Product Selection Guide (1)
  • Technical Article (1)
  • Video (4)
  • Webcast (1)
  • Software & Systems Requirements

    Evaluation Software

    JESD204 Interface Framework

    Integrated JESD204 software framework for rapid system-level development and optimization
    1.71 K

    AD9547/AD9548 Evaluation Board USB Flash Programmer Readme


    Tools & Simulations

    IBIS Model

    AD9548 IBIS Models

    Evaluation Boards

    Pricing displayed is based on 1-piece.

    Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

    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.