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ISO6760: Input RC filter value

Hideki Hayashi1
Expert 6000 points
Part Number: ISO6760

Hi team,

Customer implements RC filter at ISO6760 input. The value is R = 600ohm, C = 330pF.

Do you have recommended range for each value? Are there any effect by increasing resistor value?

Best regards,

Hayashi

  • +1
    TI__Genius 13015 points

    Hello Hayashi-san, 

    Thank you for your question.

    Hideki Hayashi1 said:
    Are there any effect by increasing resistor value?

    The equation for calculating cut-off frequency is f= 1/(2*pi*R*C). R and C are 600ohm and 330pF respectively.

    Using these values, the cut-off frequency of the filter is roughly 804kHz. Raising R would lower the cut-off frequency further.

    The max data rate of ISO6760 is 50MHz. The filter currently has a cut off frequency that is less than the data rate of the device. This is okay as long as the customer is using a data rate that is <804kHz. However, if the customer is using a data rate that is near or above the cutoff frequency, the data will be filtered out.   

    Hideki Hayashi1 said:
    Do you have recommended range for each value?

    The specific values of the filter depend on what the customer is trying to accomplish with the RC filter. The recommended range for R and C depends on system requirements such as what data rate is used and what frequencies the customer is trying to attenuate. 

    I hope this helps. Please follow up if you have further questions.

    Best Regards,

    Andrew