The AD9547/PCBZ is an evaluation board for AD9547 devices. The AD9547 provides synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9547 generates an output clock that is synchronised 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 continuously generates a clean (low jitter), valid output clock, even when all references fail, by means of digitally controlled loop and holdover circuitry.
- Supports stratum 2 stability in holdover mode
- Supports reference switchover with phase build-out
- Supports hitless reference switchover
- Automatic/manual holdover and reference switchover
- Input reference frequencies from 1KHz to 750MHz
- Reference validation and frequency monitoring (1ppm)
- Programmable input reference switchover priority
- 30bit programmable input reference divider
- Output frequencies up to 450MHz
- 20bit integer and 10bit fractional programmable feedback divider
通信与网络, 时钟与计时, 无线
