TPD12S521: Differential line trace impedance

Kazuki Itoh

Part Number: TPD12S521

Hello team,

According to the DS 11.2 layout example, the input and output patterns are connected at both side on the board via the IC.

In this case, I think it seems like the both PCB trance and IC's impedance should be considered.

Does it require any impedance adjustment considering IC's impedance?

Could you please let me know the recommended impedance adjustment procedure? (e.g. Impedance value, sub-layer GND, etc)

Also, I'd like to perform simulation after the impedance adjustment.

Could you please give me the S-parameter? I found IBIS model but didn't find S-parameter description.

On the other hand, the 2.3 Routing with VIAs explains one-sided connection. It focuses on explaining the effect of vias. However this device should be used with small VIA inductance and both-sided connection, correct?

Regards,

Itoh

over 3 years ago

0 Ansel Song over 3 years ago

TI__Expert 3890 points

Hi Itoh,

Please see the below comments:

1. There are special tools for impedance matching for HDMI traces, please follow layout guidelines.

2. This device did not have S--parameter, you can refer to IBIS model at ti.com.

3. Yes, for vias, should be small to reduce parasitic parameters.

Best regards,

Ansel

0 Kazuki Itoh over 3 years ago in reply to Ansel Song

TI__Genius 9615 points

Hello Ansel-san,

Thank you for your reply.

I don't get your answer #1.

What do you mean by the "special tools"? I can't find it from the layout guidelines on the DS nor SLVA680.

Regards,

Itoh

0 Ansel Song over 3 years ago in reply to Kazuki Itoh

TI__Expert 3890 points

Hi Itoh,

I mean impedance matching for HDMI traces can be match by some EDA tools.

Regards,

Ansel

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TPD12S521: Differential line trace impedance