EV-ADIN1100EBZ Signal voltage of twisted wire pair

Hi TrashBoat 

Thank you for reaching out to us.

When two ADIN1100 devices are connected via short cable, the signal is not attenuated, meaning you’re effectively seeing the contribution from two PHYs instead of just one. This can result in a voltage of up to 4.8Vpp.
With a long cable, the signal doesn’t drop to 2.4Vpp, it’s attenuated over longer cable length.

Kind Regards,

Shazia

Thank you for your response. 

Does this mean that as the cable is longer, signal attenuation is greater, causing the signal voltage to decrease from 4.8Vpp to closer to 2.4Vpp?

 (However, because two signals exist, it will not drop completely to 2.4Vpp.)

Hi TrashBoat,

You are correct as the cable is longer, the insertion loss of the cable will cause a decrease in the amplitude of the received signal from the device on the other end. And thus, if you look at the signal with an oscilloscope at one end of the cable, the signal will be closer to 2.4. And correct, not exactly 2.4Vpp because you would still have some signal from the received signal.

Kind Regards

Olivier

Thank you for your answer.