●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.
●Applications
● 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
●### 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
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● 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.
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