Dual Input Network Clock Generator/Synchronizer
FEATURES
Flexible reference inputs Input frequencies: 8 kHz to 750 MHz Two reference inputs Loss of reference indicators...
Description
FEATURES
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 of >400 MHz Single-ended CMOS output for frequencies of <150 MHz Programmable digital loop filter (<1 Hz to ~100 kHz) High speed digitally controlled oscillator (DCO) core
Direct digital synthesizer (DDS) with integrated 14-bit DAC Excellent dynamic performance Programmable 16 + 1-bit feedback divider, S Software controlled power-down Available 64-lead LFCSP package
Dual Input Network Clock Generator/Synchronizer
AD9549
APPLICATIONS
Network synchronization Reference clock jitter cleanup SONET/SDH clocks up to OC-192, including FEC Stratum 3/3E reference clocks Wireless base station, controllers Cable infrastructure Data communications
GENERAL DESCRIPTION
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 ...
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