• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 22 subscribers
  • Views 346 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.

Original question:

LMX2595: LMX2595 Sequence of Operation

LMX2595: LMX2595

Narendra S10
Intellectual 470 points

Part Number: LMX2595

Hello guys,

I have one issue with the LMX2595 chip.

I am getting a strong 50Hz spur along with the generated frequency. It is 40 dB down.

Are there any particular ways to filter it out in both hardware or software...

I am using a 230V 50 Hz AC mains to feed  a lab DC power supply from which I am feeding +5V to a low noise regulator.. which generates +3.3V required for the chip.

The same card generates the voltages for the OCXO being used using a low noise regulator.

Please suggest where could be the possible problems.

The

  • 0
    TI__Genius 9920 points
    Hi Narendra,
    When I got such 50 Hz interfering, normally I'll change the DC power supply firstly. Another supply will show a different result, may be better , may be worse. If it is, then the 50 Hz is from supply, otherwise, we will think if current configuration for LMX2595 can generate a 50 Hz spur.
    40 dB is really a large spur. If it is from supply, then we need some components to filter 50 Hz on supply. A power supply expert could help you.

    Regards,
    Shawn