The LMX2820 is a high-performance, wideband synthesizer that can generate any frequencyin the range of 43.75 MHz to 22.4 GHz. The high-performance PLL with figure of merit of –236 dBc/Hzand high phase detector frequency can attain very low in-band noise and integrated jitter. Thehigh-speed N-divider has no pre-divider, thus significantly reducing the amplitude and number ofspurs. There is also a programmable input multiplier to mitigate integer boundary spurs.
The LMX2820 allows users to synchronize the output of multiple devices and also enablesapplications that need deterministic delay between input and output. The fast calibration algorithmgreatly reduces the VCO calibration time to under 5 µs, enabling systems requiring fast frequencyhopping. The LMX2820 can generate or repeat SYSREF that is compliant to the JESD204B standard,allowing for its use as a low-noise clock source for high-speed data converters. This synthesizercan also be used with an external VCO. A direct PFD input pin is provided to support offset mixingfor low spurious transmission.
The device runs from a single 3.3-V supply and has integrated LDOs that eliminate theneed for onboard low-noise LDOs.