Like to get a schematic review on a TMDS442 design.

tom engelberth

Other Parts Discussed in Thread: SN75DP139, TMDS442

I have an application where I have Displayport++ from the CPU and am using a SN75DP139 (DP++ to HDMI) and TMDS442 (HDMI 1:2) to get HDMI outputs to drive two monitors.

This means I am using the TMDS442 as a 1:2 device and have 3 inputs that are just open. Like to reduce the number of resistors used to terminate all of the unused inputs. Since the 3 input ports will never be used, can I just leave things open or tie them to ground / 3.3 instead of all of the resistors?

So I would like to have my schematic reviewed to answer this question and to see if there is any else that I might have missed.

I would prefer to send the material via email.

Thanks

Tom

over 10 years ago

0 Moises Garcia over 10 years ago

TI__Mastermind 23815 points

Hi Tom,

You don't need external termination resistors, TMDS442 have them internally.
For unused TMDS inputs: the negative pin is recommended to be grounded through a 1-kΩ resistor and the positive pin left open.

I'll contact you by email for schematic review.

Regards

0 tom engelberth over 10 years ago in reply to Moises Garcia

Prodigy 20 points

Moises,

So do you have my email address or do I need to send you an email?

I do not have your email address and I do not want to post my email address on the forum. So how do we contact each other?

Thanks

Tom

0 Moises Garcia over 10 years ago in reply to tom engelberth

TI__Mastermind 23815 points

Hi Tom,

Don't worry, I can see you email from e2e account.

Regards

Interface

Interface forum

Like to get a schematic review on a TMDS442 design.