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Original question:

ADC12DJ5200RFEVM: Error message on HSDC pro

ADC12DJ5200RFEVM: Some questions

ttd
Mastermind 8600 points
Part Number: ADC12DJ5200RFEVM
Other Parts Discussed in Thread: ADC12DJ2700EVM,

Tool/software:

Dear Technical Support Team,

Thanks to the support I received in the following post, my evaluation has progressed since then. Thank you.

(+) ADC12DJ5200RFEVM: Error message on HSDC pro - Data converters forum - Data converters - TI E2E support forums

I have a few questions regarding that.

・ENOB measurements were not as good as the datasheet values.
　At 997MHz, -1dBFS: Datasheet: 8.7bits, Measurement: 8.04bits
Do you have advice to improve ENOB?

・Prolonged use caused heat generation, leading to increased noise and offset drift.
　Applying a fan reduced these issues, indicating this requires attention during design.

The default clock source on the evaluation board is set to an external clock.
ADC12DJ2700EVM, the onboard clock was the default.
Is there a specific reason for this change?

Best Regards,

ttd

  • 0
    TI__Mastermind 39020 points

    Hi Ishii,

    How is the measurement collected? Please send over a block diagram with details. The more details the better.

    We would need to understand all the details on the test setup of the 5200RF ADC and what spurs are included or excluded in the SINAD measurement in order to derive the ENOB number that you are measuring.

    Regards,

    Rob

  • 0 in reply to Rob Reeder
    Mastermind 8600 points

    Hi Rob,

    Thank you for your reply.

    I will make a report for ENOB and send it you.

    Could you comment following question?

    Why is default clock of ADC12DJ5200RFEVM external?

    --------------------

    The default clock source on the evaluation board is set to an external clock.
    ADC12DJ2700EVM, the onboard clock was the default.
    Is there a specific reason for this change?

    --------------------

    Best Regards

    ttd

  • 0 in reply to ttd
    TI__Mastermind 39020 points

    Hi Ishii,

    The on board clocking cannot handle all use cases on the EVM and we have had various customer run into issues.

    Its best to have the clocking be external.

    Regards,

    Rob