AD9549集成电路（IC）的应用特定时钟/定时规格书PDF中文资料

AD9549属于集成电路（IC）的应用特定时钟/定时。由亚德诺半导体技术有限公司制造生产的AD9549应用特定时钟/定时专用时钟和计时 IC（集成电路）产品族中的产品主要用于执行与时间或频率信息生成和分配相关的各种操作，适合的设计环境较特定，例如 AMD 和 Intel 的中央处理单元 (CPU) 或图形处理单元 (GPU)、DVD 音频设备、蓝光光盘播放器、以太网设备、PCIe、SATA、光纤通道接口、车载娱乐总线等。

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 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.

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

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