• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 21 subscribers
  • Views 474 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMX2820: Spurious while sweeping the Entire VCO Frequency Range with 25kHz Step Size

Krishnaprasad C
Prodigy 60 points
Other Parts Discussed in Thread: LMX2820

Hi TI Support,

Can the LMX2820 PLL sweep its entire VCO frequency range with a 25kHz step size, utilize instant calibration to maintain a lock time under 25us, and keep spurious levels under -55dbc? If so, what settings or configurations are needed?

Thank you for your assistance.

Best regards,

Krishnaprasad 

  • +1
    TI__Guru** 110330 points

    Hi Kris,

    25kHz per step means you will put it in fractional mode, likely your loop bandwidth is much higher than 25kHz, so spurs will happen. I could not tell exactly, as there are too many channels, but I think it is possible that some channels cannot meet -55dBc requirement.