AD9549 Dual Input Network Clock Generator/Synchronizer

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 a loss of reference condition, even when both references have failed.

The AD9549 operates over an industrial temperature range of −40°C to +85°C.

Applications
  • Network synchronization
  • Reference clock jitter cleanup
  • SONET/SDH clocks up to OC-192, including FEC
  • Stratum 3/3E reference clocks
  • Wireless base stations, controllers
  • Cable infrastructure
  • Data communications
Features and Benefits
  • 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 >
    400 MHz
  • Please see Data Sheet for additional features.
Clock & Timing
RF & Microwave
AD9549 IBIS Models
Data Sheets
Documentnote
AD9549: Dual Input Network Clock Generator/Synchronizer Data Sheet (Rev. D)PDF 1286 kB
Application Notes
Documentnote
AN-0983: Introduction to Zero-Delay Clock Timing TechniquesPDF 162 kB
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (Rev. 0)PDF 291.7 K
AN-769: Generating Multiple Clock Outputs from the AD9540 (Rev. 0)PDF 0
AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (Rev. 0)PDF 221 kB
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0)PDF 313 kB
AN-823: Direct Digital Synthesizers in Clocking Applications Time (Rev. 0)PDF 115 kB
AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies) (Rev. 0)PDF 170 kB
AN-873: Lock Detect on the ADF4xxx Family of PLL Synthesizers (Rev. 0)PDF 207 kB
AN-741: Little Known Characteristics of Phase Noise (Rev. 0)PDF 1679 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD9549ABCPZ Production64 ld LFCSP (9x9mm, 5.21mm exposed pad) OTH 260-40 to 85C14.7812.56Y
AD9549ABCPZ-REEL7 Production64 ld LFCSP (9x9mm, 5.21mm exposed pad) REEL 750-40 to 85C14.7812.56Y
AD9549BCPZ Obsolete64 ld LFCSP (9x9mm, 4.70mm exposed pad)OTH 26000Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
AD9549A/PCBZEvaluation Board250Y
Reference Materials
AD9549: Dual Input Network Clock Generator/Synchronizer Data Sheet (Rev. D) ad9549
AD9549 (All Models/All Speed Grades) ad9549
AN-0983: Introduction to Zero-Delay Clock Timing Techniques ad9510
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (Rev. 0) ad9220
AN-769: Generating Multiple Clock Outputs from the AD9540 (Rev. 0) ad9540
AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (Rev. 0) ad9540
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0) ad9856
AN-823: Direct Digital Synthesizers in Clocking Applications Time (Rev. 0) ad9856
AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies) (Rev. 0) ad9540
AN-769: 基于AD9540产生多时钟输出 (Rev. 0) ad9540
AN-873: ADF4xxx系列PLL频率合成器的锁定检测 (Rev. 0) ad9540
AN-0983: 零延迟时钟定时技术简介 (Rev. 0) ad9510
AN-939: 利用AD9912的超奈奎斯特频率操作得到高RF输出信号 (Rev. 0) ad9540
AN-927: 确定杂散来源是DDS/DAC还是其他器件(例如开关电源)[中文版] (Rev. 0) ad9540
AN-837: 基于DDS的时钟抖动性能与DAC重构滤波器性能的关系[中文版] (Rev. 0) ad9540
AN-873: Lock Detect on the ADF4xxx Family of PLL Synthesizers (Rev. 0) ad9540
AN-823: 时钟应用中的直接数字频率合成器[中文版] (Rev. 0) ad9540
AN-756: 系统采样以及时钟相位噪声和抖动的影响[中文版] (Rev. 0) ad9540
AN-741: Little Known Characteristics of Phase Noise (Rev. 0) ad9221
AN-741: 鲜为人知的相位噪声特性 ad9540
RF Source Booklet adf9010
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