Enhanced product 15-GHz RF synthesizer with phase synchronization


Product details


Integrated VCO Yes Output frequency (Min) (MHz) 39.3 Output frequency (Max) (MHz) 15100 Normalized PLL phase noise (dBc/Hz) -236 Current consumption (mA) 360 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -129 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


  • 39.3-MHz to 15.1-GHz output frequency
  • –110 dBc/Hz phase noise at 100-kHz offset with 15-GHz carrier
  • 54-fs RMS jitter at 8 GHz (100 Hz to 100 MHz)
  • Programmable output power
  • PLL key specifications
    • Figure of merit: –236 dBc/Hz
    • Normalized 1/f noise: –129 dBc/Hz
    • Up to 200-MHz phase detector frequency
  • Synchronization of output phase across multiple devices
  • Support for SYSREF with 9-ps resolution programmable delay
  • 3.3-V single power supply operation
  • Operating temperature range: –55°C to 125°C
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The LMX2694-EP device is a high-performance, wideband phase-locked loop (PLL) with an integrated voltage-controlled oscillator (VCO) and voltage regulators that can output any frequency between 39.3 MHz and 15.1 GHz without a doubler, eliminating the need for ½ harmonic filters. The VCO on this device covers an entire octave to complete the frequency coverage down to 39.3 MHz. The high-performance PLL, with a –236-dBc/Hz figure of merit and high-phase detector frequency, can achieve very low in-band noise and integrated jitter.

The LMX2694-EP allows designers to synchronize the output of multiple instances of the device. This means that deterministic phase can be obtained from a device in any use case, including one with the fractional engine or output divider enabled. The device also allows designers to generate or repeat SYSREF (compliant to JESD204B standard) to use the device as a low-noise clock source for high-speed data converters.

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Technical documentation

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Type Title Date
* Data sheet LMX2694-EP 15-GHz Wideband PLLatinum RF Synthesizer With Phase Synchronization datasheet (Rev. B) Jun. 16, 2020
User guide LMX2694EPEVM Evaluation Instructions May 23, 2019

Design & development

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Hardware development

document-generic User guide
This evaluation module is for the LMX2694-EP, which is an extended temperature, 15-GHz wideband RF synthesizser. This synthesizer supports JESD204B compliant SYSREF signal buffering and generation. The LMX2694-EP allows designers to synchronize the output of multiple instances of the device.
  • 15-GHz direct VCO output
  • 54-fs RMS jitter (100 Hz - 100 MHz) at 8-GHz carrier
  • Synchronization of output phase across mulitple devices
  • Support for SYSREF
  • Operating temperature range: -55°C to +115°C
  • This evaluation module has the complete circuit for the synthesizer, optimized and tested for performance (...)

Design tools & simulation

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

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VQFN (RTC) 48 View options

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