LMX2820中文资料具有相位同步功能、JESD 且频率校准 <5µs 的 22.6GHz 宽带射频合成器数据手册TI规格书

描述 Description

The LMX2820 is a high-performance, wideband synthesizer that can generate any frequency in the range of 45 MHz to 22.6 GHz. The high performance PLL with figure of merit of –236 dBc/Hz and high phase detector frequency can attain very low in-band noise and integrated jitter. The high-speed N-divider has no pre-divider, thus significantly reducing the amplitude and number of spurs. 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 enables applications that need deterministic delay between input and output. The fast calibration algorithm greatly reduces the VCO calibration time, enabling systems requiring fast frequency hopping. 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 synthesizer can also be used with an external VCO. A direct PFD input pin is provided to support offset mixing for low spurious transmission.

The device runs from a single 3.3-V supply and has integrated LDOs that eliminate the need for onboard low-noise LDOs.

特性 Features

• Output frequency: 45 MHz to 22.6 GHz
• High-performance PLL
• Normalized 1/f noise: –134 dBc/Hz
• High phase detector frequency
• 300-MHz fractional mode
• Programmable input multiplier
• 2.5-µs fast VCO calibration time
• –45-dBc VCO leakage with doubler enabled
• Synchronization of output phase across multiple devices
• Two differential RF outputs and one differential SYSREF output for JESD204B support