22.6-GHz wideband RF synthesizer with phase synchronization, JESD and <5-µs frequency calibration


Product details


Integrated VCO Yes Output frequency (Min) (MHz) 45 Output frequency (Max) (MHz) 22600 Normalized PLL phase noise (dBc/Hz) -236 Current consumption (mA) 500 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -134 open-in-new Find other RF PLLs & synthesizers

Package | Pins | Size

VQFNP (RTC) 48 49 mm² 7 x 7 open-in-new Find other RF PLLs & synthesizers


  • Output frequency: 45 MHz to 22.6 GHz
  • 36-fs rms jitter (12 kHz – 95 MHz) at 6 GHz
  • High-performance PLL
    • Figure of merit: –236 dBc/Hz
    • Normalized 1/f noise: –134 dBc/Hz
    • -95 dBc Integer Mode Spurs (fPD=100 MHz)
    • High phase detector frequency
      • 400-MHz integer mode
      • 300-MHz fractional mode
    • Programmable input multiplier
    • Direct PFD input for offset mixing support allowing PLL N divider to be one for ultra-low jitter
  • 2.5-µs fast VCO calibration time
  • Mute pin with 200-ns mute/unmute time
  • –45-dBc VCO leakage with doubler enabled
  • Support for external VCO up to 22.6-GHz
  • Synchronization of output phase across multiple devices
  • Two differential RF outputs and one differential SYSREF output for JESD204B support

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open-in-new Find other RF PLLs & synthesizers


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.

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Technical documentation

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Type Title Date
* Data sheet LMX2820 22.6-GHz Wideband PLLatinum RF Synthesizer With Phase Synchronization and JESD204B Support datasheet (Rev. C) Feb. 04, 2021
User guide LMX2820 Register Map (Rev. A) Dec. 09, 2020
Application note Dramatically Improve Your Lock Time with VCO Instant Calibration Sep. 17, 2020
Certificate LMX2820EVM EU Declaration of Conformity (DoC) Jun. 09, 2020
User guide LMX2820EVM Evaluation Module (Rev. A) Jan. 05, 2020

Design & development

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Hardware development

document-generic User guide
This evaluation module is for the LMX2820, which is a 22.6-GHz wideband RF synthesizser. This synthesizer supports JESD204B compliant SYSREF signal buffering and generation. The LMX2820 allows designers to synchronize the output of multiple instances of the device.
  • 22.6-GHz output
  • 40-fs RMS jitter (10 kHz - 20 MHz) at 6-GHz carrier
  • Synchronization of output phase across multiple devices
  • Support for SYSREF
  • Support external VCO input up to 22.6 GHz
  • This evaluation module has the complete circuit for the synthesizer, optimized and tested for performance, and includes (...)

Software development

SNAC072AJ.ZIP (61109 KB)

Design tools & simulation

SNAM245.ZIP (45 KB) - IBIS Model
Clock tree architect programming software
CLOCK-TREE-ARCHITECT Clock tree architect is a clock tree synthesis tool that streamlines your design process by generating clock tree solutions based on your system requirements. The tool pulls data from an extensive database of clocking products to generate a system-level multi-chip clocking solution.
  • Accepts customer specific design requirements such as input frequencies, output frequencies, clock formats and clock counts
  • Generates clock trees by taking into account a variety of advanced specifications, such as noise floor and phase determinism requirements
  • Presents clear and intuitive block (...)

CAD/CAE symbols

Package Pins Download
VQFN (RTC) 48 View options

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