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ADI 公司的AD9547是雙路/四路輸入網絡時鐘發生器/同步器,能為許多系統包括同步光網絡(SONET/SDH)提供同步.輸入基準頻率從1 kHz 到750 MHz,頻率監視1ppm,輸出頻率高達450MHz,主要應用在網絡同步,OC-192的SONET/SDH時鐘,無線基站,控制器,有線基礎設備和數據通信. 本文介紹了AD9547主要特性, 功能方框圖,詳細方框圖, 輸出同步方框圖和評估板電路圖以及評估板材料清單.
AD9547: Dual/Quad Input Network Clock Generator/Synchronizer
The AD9547 provides synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9547 generates an output clock that is synchronized 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. The AD9547 operates over an industrial temperature range of ?40℃ to +85℃.
AD9547主要特性:
Supports Stratum 2 stability in holdover mode
Supports reference switchover with phase build-out
Supports hitless reference switchover
Automatic/manual holdover and reference switchover
2 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 kHz to 750 MHz
Reference validation and frequency monitoring (1 ppm)
Programmable input reference switchover priority
30-bit programmable input reference divider
2 pairs of clock output pins, with each pair configurable as a single differential LVDS/LVPECL output or as 2 single-ended CMOS outputs
Output frequencies up to 450 MHz
20-bit integer and 10-bit fractional programmable feedback divider
Programmable digital loop filter covering loop bandwidths from 0.001 Hz to 100 kHz
Optional low noise LC-VCO system clock multiplier
Optional crystal resonator for system clock input
On-chip EEPROM to store multiple power-up profiles
Software controlled power-down
64-lead LFCSP package
AD9547應用:
Network synchronization
Cleanup of reference clock jitter
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
?圖1.AD9547功能方框圖
圖2.AD9547詳細方框圖
圖3.AD9547輸出同步方框圖
圖4.AD9547評估板電路圖(1)
圖5.AD9547評估板電路圖(2)
圖6.AD9547評估板電路圖(3)
AD9547評估板材料清單(BOM)見:
AD9547: Dual/Quad Input Network Clock Generator/Synchronizer
The AD9547 provides synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9547 generates an output clock that is synchronized 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. The AD9547 operates over an industrial temperature range of ?40℃ to +85℃.
AD9547主要特性:
Supports Stratum 2 stability in holdover mode
Supports reference switchover with phase build-out
Supports hitless reference switchover
Automatic/manual holdover and reference switchover
2 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 kHz to 750 MHz
Reference validation and frequency monitoring (1 ppm)
Programmable input reference switchover priority
30-bit programmable input reference divider
2 pairs of clock output pins, with each pair configurable as a single differential LVDS/LVPECL output or as 2 single-ended CMOS outputs
Output frequencies up to 450 MHz
20-bit integer and 10-bit fractional programmable feedback divider
Programmable digital loop filter covering loop bandwidths from 0.001 Hz to 100 kHz
Optional low noise LC-VCO system clock multiplier
Optional crystal resonator for system clock input
On-chip EEPROM to store multiple power-up profiles
Software controlled power-down
64-lead LFCSP package
AD9547應用:
Network synchronization
Cleanup of reference clock jitter
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
?圖1.AD9547功能方框圖
圖2.AD9547詳細方框圖
圖3.AD9547輸出同步方框圖
圖4.AD9547評估板電路圖(1)
圖5.AD9547評估板電路圖(2)
圖6.AD9547評估板電路圖(3)
AD9547評估板材料清單(BOM)見:
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