LMX2572EVM: Using RAMP function for EMI frequency stepping

Bob Haagensen

Part Number: LMX2572EVM
Other Parts Discussed in Thread: LMX2572

I have been asked by Customer Support - Case CS0171405 - to submit this question to E2E.
I would like to use an LMX2572 Eval board as a signal source for Electro Magnetic Immunity testing. I need to step from 800 to 3000 MHz in steps of 8 MHz, and dwell on each frequency for 5 seconds. Phase continuity or relationships are irrelevant.
I believe the RAMP function in TICSPro can be used to do this, but I'm not sufficiently familiar with the set-up process. I've looked at the procedures in the Data sheet (8.1.7) and the Eval board (3.2.2 and 3.2.3). I think this will be a Manual Ramp, but I did not see much reference to Manual Ramp in the Eval board document.
Would it be possible for you to give me the configuration values for the TICSPro RAMP menu, given the objectives above?
Thank you
regards,
Bob

over 4 years ago

0 Vibhu Vanjari over 4 years ago

TI__Genius 11900 points

Hello Bob,

You can sweep this whole frequency range, however there will be manual changes to the channel divider. You will need to do something like this:

Set VCO to 3200 MHz, channel divider to 4, sweep VCO from 3200 MHz to 6400 MHz: to get outputs 800 MHz to 1600 MHz.

Set VCO to 3200 MHz, channel divider to 2, sweep VCO from 3200 MHz to 6000 MHz: to get outputs 1600 MHz to 3000 MHz.

You can use the RAMP tab of the LX2592 TICSPro GUI to configure the RAMP and then hit the Update Ramp GUI to configure the registers. Please let me know if there is anything specific on this tab that you have issues with.

Please also take a look at: https://e2e.ti.com/support/clock-and-timing/f/48/t/803411 which addresses a similar situation.

Thanks,

Vibhu

0 Bob Haagensen over 4 years ago in reply to Vibhu Vanjari

Intellectual 370 points

Hi Vibhu,

Your comment - along with Dean's - puts everything in perspective. I should be good to go.

Thank you, gentlemen!

regards,

Bob

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LMX2572EVM: Using RAMP function for EMI frequency stepping