【产品】FemtoClock NG通用频率转换器8T49N287(2输入/ 2-PLL / 8输出)




Renesas旗下IDT推出的FemtoClock NG通用频率转换器8T49N287具有两个独立的分数反馈锁相环,可用作具有抖动衰减的频率转换器或频率合成器。 它配有六个整数和两个分数输出分频器,可以产生多达八种范围从8 kHz到1 GHz的不同输出频率。 输出频率可以完全独立于输入频率,并且在这些频率中,多达四个频率可以完全彼此独立。 八个输出可以选择LVPECL,LVDS,HCSL或LVCMOS输出电平。
产品框图:
图1 8T49N287功能框图
应用:
8T49N287非常适用于各种设备,包括10G / 40G / 100G SONET / SDH和以太网网络线卡,无线基站基带单元,广播视频,运营商以太网交换机,OTN或测试和测量应用。 8T49N287可用于GbE / 10GbE / 100GbE同步以太网线卡应用,以保证时钟卡上的同步设备定时源(SETS)符合G.8262标准。
相关器件:
IDT的第三代通用频率转换器系列还包括8T49N285(2输入/ 1-PLL / 8输出),8T49N286(4输入/ 2-PLL / 8输出)和8T49N242(2输入/ 1-) PLL / 4输出)。 这些器件分别由同步以太网(SyncE)和10G-40G SyncE的82P33714和82P33731同步设备定时源(SETS)补充。
特征:
• 在保持模式下支持GR.1244 Stratum 3稳定性
• 与同步设备定时源(SETS)设备配对时,符合Telcordia GR-253-CORE(SONET)和ITU- T G.813 / G.8262(SDH / SONET 和SyncE)中列出的要求
• 产生多达8个LVPECL / LVDS / HCSL或16个LVCMOS输出时钟,范围从8kHz到1.0 GHz(差分),8 kHz到250 MHz(LVCMOS),满足10G到100G以太网和STM-256 / OC -768应用的抖动限制
· 0.3ps RMS(包括杂散),12 kHz至20 MHz
• 可接受最多两个LVPECL,LVDS,LVHSTL,HCSL或LVCMOS输入时钟,范围为8 kHz至875 MHz
· 自动和手动输入时钟选择,无中断切换
· 时钟输入监控,包括支持有间隙的时钟
• 相位斜率限制和完全无中断开关选项可控制输出相位瞬变
• 采用10 MHz至40 MHz基模晶体工作
• 通过I2C / SPI或外部I2C EEPROM进行寄存器编程
• 8T49N287-998“从EEPROM启动”
• 8T49N287-999“已禁用通电”
• 由IDT Timing Commander软件支持
产品选型:
图2 产品选型
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本文由ChangeArmy翻译自IDT(Renesas收购),版权归世强硬创平台所有,非经授权,任何媒体、网站或个人不得转载,授权转载时须注明“来源:世强硬创平台”。
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