1 Reply Latest reply on Jun 20, 2017 6:17 AM by rghe

    FX3 Oscillator Phase Noise




      Quick question on the FX3 USB3014 chip and the phase noise requirements.  On one of the App notes Cypress recommends using the ASEMB-19.200MHz-LY oscillator.  I wanted to run the FX3 at 26MHz so I asked Abracon about using the ASEMB-26.00MHz-LY oscillator and sent them the phase noise requirements outlined in the FX3 datasheet.  They returned the phase noise of the ASEMB-26.00MHz-LY and it does not meet the requirements outlined in the FX3 datasheet.  They did recommend the following oscillator which does meet the phase noise requirements Abracon - ASTMUPCE-33-26.000MHz-LJ-E-T but the only difference is this oscillator has a stability of +/-20ppm while the ASEMB is +/-10ppm.
      What is the requirement on the Frequency Stability of the oscillator?


      Thank you