DP141RLJEVM: 90 ohm differential impedance

Areej Sajjad

Part Number: DP141RLJEVM
Other Parts Discussed in Thread: SN65DP141

Hi, I have been working with the evaluation module for SN65DP141. My particular application is for DisplayPort. I noticed the DP141 schematic specifies a 90 ohm differential. Is there a reason for that? The DP standard calls out 100 ohms.

Thanks,

Areej

10 months ago

0 David (ASIC) Liu 10 months ago

TI__Guru**** 158871 points

Areej

From the DP specification, it requires the differential impedance to be 100ohms +-10%. Using 90ohm differential impedance would help reducing the insertion loss of the transmission line.

Thanks

David

0 Areej Sajjad 10 months ago in reply to David (ASIC) Liu

Prodigy 20 points

Thanks, David. Can you explain how this reduces insertion loss?

0 David (ASIC) Liu 10 months ago in reply to Areej Sajjad

TI__Guru**** 158871 points

Areej

I will point you to this link for the explanation, https://www.signalintegrityjournal.com/articles/1734-how-to-reduce-attenuation-in-a-differential-channel.

Thanks

David

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DP141RLJEVM: 90 ohm differential impedance