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THVD1550: Vcm(common mode) frequency performance

Hisao Uchikoshi
Genius 13560 points
Part Number: THVD1550

Hi Experts,

My customer is asking about any data how high VCM frequency can be accepted without disturbing receiver operation.

Regards,

Uchikoshi

  • 0
    TI__Mastermind 48215 points

    Hi Uchikoshi-san,

    This device has a common-mode range of +-15V. This means that the receiver will remain capable of recognizing the differential signal as long as the common mode remains within this range.

    Let me know if you have any more questions.

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Genius 13560 points

    Hi Eric,

    Thank you for your answer. Please let me confirm again. Though my question might not be good, how fast Vcm transient can be accepted? For example, with 1V/us Vcm transient within +-15V, the receiver still can work well but with 10V/us Vcm transient, the receiver cannot work.

    Does TI have any data?

    Regards,

    Uchikoshi 

  • +1 in reply to Hisao Uchikoshi
    TI__Mastermind 48215 points

    Hi Uchikoshi-san,

    We don't test this condition explicitly for our devices. Because the receiver is differential, it is very resistant to common-mode noise. In a system that expects fast common-mode transients or high frequency common-mode noise, it's more likely that some of this noise will become differential due to asymmetries in the bus topology or layout. This is to say that there are many variables that can impact the exact frequency in which the receiver becomes unreliable. However, the device itself is designed to remain operational as long as the noise remains common-mode and does not become differential noise. 

    Regards,
    Eric Schott