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SN65HVD62: About output emissions

Toshiyuki
Mastermind 7075 points

Part Number: SN65HVD62

Hi,

I'm confirming the schematic of SN65HVD62EVM. Please let me know the reason why C6/470pF and L1/0.22uF are used. We couldn't use the same parameter for these capacitance..

Best Regards,

Toshiyuki

  • 0
    TI__Mastermind 25705 points
    Toshiyuki-san,
    L1 0.22uF is used to AC couple the signal. With 50Ohm resistance, the cut off frequency is about 15kHz, which is 5 times slower than the data rate (115.2kbps). On the other hand, C6 470pF combining with 50Ohm to create a low pass filter on the IO, which has cut off frequency of 6kHz. In general we don't recommend to change this values. What's your data rate and what values do you want to use?
    Regards,
    Hao