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SN65HVD24: Transmission using long cable with surge absorption

Guru 16770 points
Part Number: SN65HVD24

Hi

Used SN65HVD24, failing transmission of 300 meter cable at 4MHz rates.

At this point, a surge absorption part is used for requirement of IEC61000-4-5.

If absorption part is removed, transmission can be passed above use case.

(It is no wonder because SN65HVD24 has internal equalizer.)

So, the cause of fail seems to be a capacitance of absorption part.

Do you have reference material for achieving transmission with long distance (300 m) using absorption part like CDSOT23-SM712?

Could you please tell me your view?

BestRegards

  • Can you please check the waveform at receiver end with and without surge protection diode? Unfortunately I don't have any test data for your specific application. But please be aware each equalizer in HVD2x devices has different frequency repsonse characteristics. You may try HVD23 to see if it could make a difference.

    Regards,