TMDS181: TMDS181 Retimer input impedance

Shu-Cheng LIN

Guru 11785 points

Part Number: TMDS181

Hi Sirs,

Sorry to bother you.

Some questions on TMDS181 impedance need confirm,

1. We saw spec impedance is 100 ohm (TYP). The test environment is mean power on or power off??

2. We need to pass HDMI logo.

Our final test results is 72 ohm on TMDS181 input(CLK,data), the impedance couldn't meet 100 ohm

Could you share experience for us?

Thanks for your reply

over 7 years ago

0 Moises Garcia over 7 years ago

TI__Mastermind 23815 points

Hi Shu-Cheng,

The impedance is typically 100ohms in both scenarios TMDS181 on and off.
Could you provide the markings on TMDS181? customer may have a pre-production sample.

Regards

0 Shu-Cheng LIN over 7 years ago in reply to Moises Garcia

Guru 11785 points

Hi Moises,

Please refer pic as below

Kindly let us know if need others information. Thanks!!

0 Moises Garcia over 7 years ago in reply to Shu-Cheng LIN

TI__Mastermind 23815 points

Hi ShuCheng,

I can't see clearly if the mark says TI 58 it is a preproduction sample, you need sample 5A or newer.

If the mar says TI 68, please submit a HelpMe ticket to continue debugging.

Regards

0 Shu-Cheng LIN over 7 years ago in reply to Moises Garcia

Guru 11785 points

Hi Moises,
The mar is TI68. What is mean submit a HelpMe ticket ??

0 Sam Ting over 7 years ago in reply to Shu-Cheng LIN

TI__Intellectual 2720 points

The application is video capture card. Please find the system block diagram below. I've submitted the HelpMe ticket.

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TMDS181: TMDS181 Retimer input impedance