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LMX2592: LMX2592 programming problem 3500-3550MHz

Allison Saldana
Prodigy 40 points

Part Number: LMX2592
Other Parts Discussed in Thread: LMX2582

Greetings,

We are sweeping frequencies on the LMX2592 EVM board using the TICS PRO SW, and in the range 3500-3550 MHz the programming automation is not enabling the VCO div/2 in time and the VCO is operating at too low frequency.

Is there a bug in the code, or are we doing something incorrectly?

Here is a screen shot of the problem:

The N divider is also complaining, but can be worked around using a 2nd order mash order.

Thank you for your guidance.

Allison 

 

  • 0
    TI__Mastermind 28031 points

    3056.LMX2582.zipAllison,

    Thank you for your feedback.  In regards to the output frequency, this was an error in the code.  I have fixed it and it will be in the next TICSPro release.  Also, if you want to try the newer one now, I am attacing it.  To use this one,  you can go to the menu of "Select Device" -> "Import User Device"

    Regards,

    Dean

  • 0 in reply to Dean Banerjee
    Prodigy 40 points

    Hi Dean,

    Sorry for the delayed reply I did not receive a notification of your response.

    Thank you for the new TICS release.  When the LMX2582 device is selected in TICS the LMX2592 eval board seems to work as expected .  However, when the LMX2592 device is selected in TICS, the new release does not appear to be programming the device properly as there there is no output signal.  Can you confirm?

    Thanks for your help!

    Allison

      

  • 0 in reply to Allison Saldana
    Prodigy 40 points

    Hi Dean,

    When will the updated TICS Pro be released?  The latest one I see is v1.6.6.6, 30-Aug-2017  (http://www.ti.com/tool/TICSPRO-SW

    Looking for the output frequency error fix in the code.  

    Thanks!

    Allison

  • 0 in reply to Allison Saldana
    TI__Mastermind 28031 points

    Allison,

    It's on the web now.  If you unzip the file, it has a date of 10-30-2017.

    The confusion is that it says on the web that its 30-AUG-2017, and version 1.6.6.6.  But this is not really true.

    Although the main program was not updated (thus the old revision number), the part files were.

    I am going to tell them to change the date to 30-OCT-2017 on web.

    Regards

    Dean

  • 0 in reply to Dean Banerjee
    Prodigy 40 points
    Dean,

    Thank you for this, I was able to download and the glitch is fixed!

    Using the automated settings provided when changing the output frequency we do get a orange highlighted warning for the N-divider being too low and have to reduce the prescaler in order to lock on certain frequencies like 730-750 and 1750MHz. At 3550MHz the Fpd had to be adjusted from 100MHz to 50MHz. A quick manual change to the prescaler and it works.

    Our plan is to program the LMX2592 from a microcontroller. Do you have any code examples or pseudo-code on how to implement this in the simplest way?

    Best,
    Allison
  • 0 in reply to Allison Saldana
    TI__Genius 9920 points
    Hi Allison,
    We haven't MCU code. You could follow below operations steps.
    1, Make sure MCU GPIOs could work as in SPI/uwire communication.
    2, Programming LMX2592 as datasheet recommended.
    7.5.1 Recommended Initial Power on Programming Sequence
    7.5.2 Recommended Sequence for Changing Frequencies

    Regards,
    Shawn