TI LMK5C33216高性能网络时钟发生同步与抖动衰减器解决方案

TI公司的LMK5C33216是高性能网络时钟发生器,时钟同步器和抖动衰减器,具有先进的基准时钟选择和无损伤切换功能,以满足通信基础设备应用兵的严格要求.LMK5C33216集成了可编回路带宽和没有外接回路滤波器的3 DPLL,最大化灵活性和容易使用.每个DPLL相位锁住一对APPL到DPLL基准输入.3 APLL工作于独立于它们配对的DPLL,和另外的APLL级联,以提供可编程频率变换.APLL3具有超高性能PLL和TI专有的体声波(BAW) VCBO技术,能产生输出时钟,其抖动器为40fs RMS抖动独立性,以及XO频率和基准输出.APLL1和APLL2提供了选择另外的频域.BAW APLL在491.52 MHz的抖动为40 fs RMS,可编DPLL回路带宽从0.01Hz到4kHz.100Hz失调122.88 MHzDPLL TDC噪音为-116 dBc/Hz,有两个差分或单端DPLL输入,1Hz到800MHz差分,无损伤切换和相位消除和/或相位斜率控制,有16个可编格式的输出:1000 MHz LVPECL/LVDS/HSDS,OUT4和OUT6的3000 MHz CML以及OUT0和OUT1的200 MHz LVCMOS.带内部LDO的单个3.3V电源,器件有用户可编EEPROM,支持105 C PCB温度.主要用在4G和5G无线网络,基带单元(BBU),有源天线阵列(AAU),遥控无线电单元(RRU),网络交换(5G HUB)和小型基站.本文介绍了LMK5C33216主要特性,高等级框图,PLL架构图, DPLL独立模式图和级联模式图, APLL和DPLL级联使能/失能案例图, 评估模块LMK5C33216EVM主要特性和参考电路图和材料清单.

The LMK5C33216 is a high-performance networkclock generator, synchronizer, and jitter attenuatorwith advanced reference clock selection andhitless switching capabilities designed to meetthe stringent requirements of communicationsinfrastructure applications.

The LMK5C33216 integrates 3 DPLLs withprogrammable loop bandwidth and no external loopfilters, maximizing flexibility and ease of use. EachDPLL phase locks a paired APLL to a DPLL referenceinput. The APLL reference determines the long termfrequency accuracy.

The 3 APLLs may operate independent of their pairedDPLL and be cascaded from another APLL to provideprogrammable frequency translation. APLL3 featuresultra high performance PLL with TIs proprietaryBulk Acoustic Wave (BAW) VCBO technology and

can generate output clocks with 40-fs RMS jitterindependent of the jitter and frequency of...