SN65DPHY440SS: Equalization feature

Kei,

Kei Kuwahara said:

This means that if the input signal was attenuated by 4.5dB along the data line, this device can output a signal with 0.5dB attenuated signal compared to the original signal?

Yes. The device would only be able to compensate for 4 dB of the total 4.5 dB loss. Therefore, a trace length reduction would be recommended or another way to mitigate the excessive loss going into the receiver side of the device.

Thanks,

Zach

Kuwahara-san

The receiver equalization works at the receive end of the signal path by selectively boosting the high-frequency data. An equalizer circuit has a frequency response that in a perfect world, is exactly opposite to the transmission media’s loss profile that the equalizer is attempting to compensate, resulting in the data having zero attenuation in the targeted frequency band. In this way equalizer help to compensate for the insertion loss in a channel and also reduce ISI.

In your example, 4dB compensation will be provided by DPHY440 equalizer and leave 0.5dB loss uncompensated.

Thanks

David