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Original question:

LMK05318BEVM: BAW not lock after status read

LMK05318BEVM: Hardware changes for programming eval through external controller

Akshay Rathod
Prodigy 40 points

Part Number: LMK05318BEVM
Other Parts Discussed in Thread: USB2ANY, , LMX2595, LMK05318B

The Eval works fine now, to evaluate further we wish to program the eval from our inhouse controller, we have the register files, can you guide on jumper settings and hardware changes, where resisters need to be removed and cables need to be soldered?

  • 0
    TI__Genius 17380 points

    Hi Akshay, 

    To connect an external I2C/SPI controller to the EVM, you should be able to connect through jumper wires to the J6 header. I would recommend removing resistors R96/R97 to prevent driving the onboard USB2ANY pins while it's not powered on. Let me know if you have any other questions on this. 

  • 0 in reply to Connor Lewis
    Prodigy 40 points

    the signal was with lot of spurious. so i reverted the connection but still i see one spurious which was not present earlier.

  • 0
    Prodigy 40 points

    One SMA port got damaged while working, could that be a reason. We terminated that port but still could that be a reason

  • 0 in reply to Akshay Rathod
    TI__Genius 17380 points

    Hi Akshay, 

    If I'm reading the phase noise measurement correctly, it looks like the measured frequency is ~2.4GHz which is greater than the max supported output frequency of 1250MHz. Can you share your .tcs configuration file and expected output frequency? 

  • 0 in reply to Connor Lewis
    Prodigy 40 points

    We are using the LMK05318BEVM in our up-converter to give reference for the LMX2595. We made the hardware modifications as discussed in the TI E2E thread to enable programming through an external controller.

    After the modification, we observed additional spikes in the system-level phase-noise measurement. The phase-noise performance of the LMK05318B is also attached for reference, which shows some spurious, however, the integrated system phase-noise plot shows discrete spurious components that were not present in our previous measurements.

    Furthermore, after reverting the hardware modifications and restoring the original EVM configuration, the system-level phase-noise performance has not returned to the previous baseline, and the additional spurious components are still observed. Could this be related to a grounding issue, since after I put the top plate of the enclosure, one of the spike reduced. Now the PCB is standing on studs; we are planning to make a ground plate for it to rest. Your guidance would be helpful.

    Also attached is the .tcs file for reference.

    UP_MANUAL HOLDOVER.TCS

  • 0 in reply to Akshay Rathod
    TI__Genius 17380 points

    Hi Akshay, 

    Thanks for the clarification, I think I understand the issue now. That is odd that you're seeing more spurious behavior after the rework. I looked through your .tcs configuration and I don't see any obvious settings in the configuration which could introduce spurs. If one of the SMA ports was damaged that could affect the signal integrity of the output, but it's hard to say without seeing the EVM. Are you measuring the output single-ended, or differentially using a balun? Do you also have the correct termination for the AC-LVDS output format? And just to double check that the device is booting up correctly, can you try this startup sequence:

    1. Power up LMK05318B or toggle PDN pin to trigger power-on-reset sequence 

    2. Read back all registers in TICS Pro 

    3. Load your .tcs file 

    4. In TICS Pro toolbar, click "Write all registers"

    5. In TICS Pro toolbar, click "Soft-reset chip"