【应用】小尺寸3225封装的低相位抖动石晶体振荡器用于光模块,常温频率偏差±15ppm
光模块(Optical Modules)作为光纤通信中的重要组成部分,是实现光信号传输过程中光电转换和电光转换功能的光电子器件。光模块产品中晶振的作用为提供频率脉冲信号源,通常一个系统共用一个晶振,使各部分保持同步。
本文主要推荐采用EPSON公司的晶体振荡器(SPXO)——SG3225EEN,具备低相位抖动优势(典型值46fs,在输出频率156.25MHz、VCC=3.3V±0.165V条件下)。此外,SG3225EEN具备LV-PECL(低压正发射极耦合逻辑)输出,电源电压支持3.3V ± 0.165V或者2.5V ± 0.125V,频率范围为25MHz~500MHz,频率稳定度为±25ppm(最大值,包括初始频率公差、温度变化、电源电压变化以及5年老化),完全可满足光模块的设计要求。
表1 SG3225EEN的电性能参数
图1 SG3225EEN在156.25MHZ条件下相位抖动
此外,SG3225EEN的外部封装为3225封装,尺寸仅为3.2mm × 1.5mm × 1.05mm,可有效降低对系统空间的占用。同时,振荡启动时间不超过10ms,起振速度快;工作电流不超过60mA,有利于降低系统功耗。
图2 SG3225EEN的封装与引脚
综上所述,该晶体振荡器SG3225EEN的性能参数完全符合光模块的要求,是一个优秀解决方案。
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