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Original question:

ADC12DJ5200RFEVM: Change from external to onboard clock

ADC12DJ5200RFEVM: HSDC Pro error when changing on board clock with ADC12DJ5200RFEVM

ttd
Mastermind 9065 points

Part Number: ADC12DJ5200RFEVM
Other Parts Discussed in Thread: TSW14J58EVM, LMX2594

Dear Technical Support Team,

I changed onboard clock from external clock (default).

ADC12DJ5200RFEVM: Change from external to onboard clock - Data converters forum - Data converters - TI E2E support forums

We changed the clock source and connected the system to the capture board TSW14J58EVM.

However, when we clicked the Capture button, the following error occurred and the system did not operate.

Could you please advise on how to resolve this error? See attached file.

HSDC_ADC_Settings.pdf 

 

Configure ADC

SH_MB_LOCK_ERROR

Unable to obtain SH and MB lock. Please check if the ADC is configured.

 

The changes made compared to the configuration before changing the clock source are listed below.

Is there anything missing or incorrect?

・Circuit modifications

　Removed C2, C3, C60, and C61

　Installed R171 (0 Ω) and R174 (0 Ω) → shorted

　Installed C52 (0.1 µF) and C306 (0.1 µF)

　Removed J13

 

・ADC GUI settings

EVM tab

#1 Clock Source: On-board

#2 On-board Fs Selection: Fs = 5000 MSPS

 

Best Regards,

ttd

  • 0
    TI__Mastermind 45670 points

    TTD,

    Please check the soldering and make sure with an oscope that the appropriate clock frequencies and levels are coming and going into and out of the LMK, LMX and ADC appropriately. This is the best place to start.

    The onboard clocking option does work. Customers us it all the time.

    Regards,

    Rob

  • 0 in reply to Rob Reeder
    Mastermind 9065 points

    Hi Rob,

    LMX2594 doesn't output. Input for OSCINP/N is applied 250MHz.

    Is there anything that ADC GUI should set the register or paramator?

    See file I send via Email . 

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Guru** 117260 points

    Hi ttd,

    Would you confirm you can see the 250MHz signal at R265?

    Would you also measure the LMX_VTUNE voltage at R263?

    Is there no output at all or the output frequency is not correct?

  • 0 in reply to Noel Fung
    Mastermind 9065 points

    Hi Noel,

    Thank you for your reply.

    >Would you confirm you can see the 250MHz signal at R265?

    →Yes

    >Would you also measure the LMX_VTUNE voltage at R263?

    →Measurements of R263 showed an output of approximately 100MHz and 120mV as shown in the attachment, but it was unstable.

    　The attached waveform has persistence enabled.

    >Is there no output at all or the output frequency is not correct?

    →The output was also similar to that of LMX_VTUNE.Could you please explain the role of LMX_VTUNE and its intended voltage level?

    See attached file.
    LMX_OutputClock_VTUNE.pdf

    Best Regards,

    ttd