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DS90UB913A-Q1: AC coupling value when connecting with DS90UB954-Q1

Ryuji
Guru 20090 points
Part Number: DS90UB913A-Q1
Other Parts Discussed in Thread: DS90UB954-Q1

Hello,

Could you please let me know the concern when we use 33nF AC coupling capacitor for connection of  DS90UB913A-Q1 and DS90UB954-Q1 with STP cable?
I understand that the recommended value is 100nF for pair of 913A and 954 due to difference the line rate between 913A and 953. 
However, our customer would like to connect 913A camera to 954 ECU which is not designed for 913A.

Best Regards,
Ryuji

  • 0
    TI__Genius 12705 points
    Hello,
    When using smaller capacitor value for connection with 913A the link margin will not be optimized. The forward channel may have minor effect, however lower frequency on the back channel will be affected also. The lower capacitor value can cause some droop in the back channel waveform.