TI LMX282022．6－GHz宽带PLLatinum RF合成器解决方案

TI公司的LMX2820是高性能宽带PLLatinum RF合成器,能产生45MHz到22.6-GHz间任何频率,其高性能PLL品质因数为–236 dBcHz,高相位检测频率可以得到非常低的带内噪音和积分抖动.高速N分频器没有预分频器,因此大大地降低尖峰的幅度和数量.同时可编程输入乘法器能减轻积分边界尖峰. 6 GHz时在12 kHz – 95 MHz的抖动为36-fs rms,归一化1f噪音为–134 dBcHz. fPD=100 MHz时的积分模式尖峰为-95 dBc,高相位检测频率有400MHz的整数模式和300MHz小数分频模式.器件具有2.5-μs快速VCO 校准时间.支持外接VCO高达22.6-GHz,输出相位多个器件同步.主要用在雷达和电子战,5G和mm波无线基础设备.微波回程,测试和测量设备,高速数据转换器时钟.本文介绍了LMX2820主要特性,框图和典型应用电路图以及评估板LMX2820EVM主要特性,连接图,电路图,材料清单和PCB设计图.

The LMX2820 is a high-performance, widebandsynthesizer that can generate any frequency in therange of 45 MHz to 22.6 GHz. The high performancePLL with figure of merit of –236 dBcHz and highphase detector frequency can attain very low in-bandnoise and integrated jitter. The high-speed N-dividerhas no pre-divider, thus significantly reducing theamplitude and number of spurs. There is also aprogrammable input multiplier to mitigate integerboundary spurs.

The LMX2820 allows users to synchronize the outputof multiple devices and also enables applications thatneed deterministic delay between input and output.The fast calibration algorithm greatly reduces theVCO calibration time, enabling systems requiring fastfrequency hopping. The LMX2820 can generate orrepeat SYSREF that is compliant to the JESD204Bstandard, allowing for its use as a low-noise clocksource for high-speed data converters. Thissynthesizer can also be used with an external VCO. Adirect PFD input pin is provided to support offsetmixing for low spurious transmission.

The device runs from a single 3.3-V supply and hasintegrated LDOs that eliminate the need for onboardlow-noise LDOs.

LMX2820主要特性:

• Output frequency: 45 MHz to 22.6 GHz

• 36-fs rms jitter (12...