【应用】Epson低相位抖动晶体振荡器SG7050EBN用于帧同步器系统,相位抖动低至65fs
在具备SDI(数字分量串行接口)的相关产品(如高清广电级摄像机)中,为了分离各路时隙信号,通常利用帧同步器对发射端的每帧信号进行标记,并在接收端检测该标记,以实现信号的正确接收与交换。如图1所示的帧同步器系统框图,可以看出,为了保证图像处理模块的正常工作,时钟信号是非常重要的一部分,若时钟信号不准确,轻则导致系统误操作,重则导致设备瘫痪无法运转。因此,在进行帧同步器系统的时钟振荡电路设计时,应当选取高精度的晶体振荡器(如图1中的B所示)。
图1 帧同步器系统框图
EPSON(爱普生)公司具备业界领先的晶体振荡器制造技术,占超过1/5的市场份额,是全球最大的晶体振荡器产品解决方案提供商。对于帧同步器系统的时钟振荡电路设计,本文主要推荐采用Epson公司的晶体振荡器(SPXO)——SG7050EBN,具备低相位抖动优势(典型值65fs,在输出频率156.25MHz、VCC=3.3V±0.165V条件下),详细的相位抖动信息如图2所示。此外,SG7050EBN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100MHz~175MHz,频率稳定度为±50×10-6(最大值,包括初始频率公差、温度变化、电源电压变化、回流焊接漂移以及10年老化),输出精度高,完全可满足帧同步器的设计要求。
图2 SG7050EBN的相位抖动信息
值得一提的是,SG7050EBN的外部封装尺寸仅为7.0mm × 5.0mm × 1.5mm,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,工作温度范围为-40°C~+85°C,存储温度范围为-55°C~+125°C,起振速度快且环境适应性好。此外,工作电流不超过75mA(对应电源电压3.3V ± 0.165V)或者55mA(对应电源电压2.5V ± 0.125V),有利于降低系统功耗。SG7050EBN的订购信息如图3所示,更多关于Epson公司晶体振荡器解决方案以及在线采购等信息均可在世强官网搜索获取,例如:
图3 订购信息
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测试范围:扬兴晶振全系列晶体,通过对晶体回路匹配分析,调整频率、驱动功率和起振能力,解决频偏、不起振、干扰、频率错误等问题。技术专家免费分析,测完如有问题,会进一步晶振烧录/修改电路。
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