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LDC3114-Q1: Sensor Frequency Above 3MHz Recommendation

Jacob Wyrick
Expert 8365 points
Part Number: LDC3114-Q1

Hi team,

In the LDC3114-Q1 datasheet, it is recommended multiple times that, "for optimal performance, configure the sensor frequency to be greater than 3MHz". However, it is not clear to me why we have made that recommendation.

Why would anything below 3MHz not be recommended even if the device can operate between 1MHz - 30MHz?

What would be the ramifications of designing a coil below 3MHz for, say, doing a device-to-device comparison between LDC161x-Q1 and LDC3114-Q1?

Thanks,

Jacob

  • +1
    TI__Mastermind 18545 points

    Hello Jacob, 

    We actually recommend staying above 5MHz for the sensor frequency. The datasheet will be updated to reflect this along with the part's full release. The reason we recommend staying above this frequency is because we noticed cases with poor performance below this value. Going below this can cause the sensor oscillation to start acting in an undesired manner. This can result in cases where you see higher noise on the sensor which impacts the sensed resolution and can sometimes impact the baseline tracking algorithm. 

    Best Regards, 

    Justin Beigel

  • 0 in reply to Justin Beigel
    TI__Expert 8365 points

    Hi Justin,

    Appreciate the insight! The 5MHz comment is aligned with what I had seen in the design calculator tool. Good to know the datasheet will be updated.