TFP401A: LVDS_HDMI Bridge

Teboho Ramakatsa

Prodigy 70 points

Part Number: TFP401A
Other Parts Discussed in Thread: SN75LVDS83B, , TFP401

I'm in the process of implementing a LVDS to HDMI bridge using the TFP401A and SN75LVDS83B two chip approach.

My question is regarding SCDT (pin8), can I leave it not connected?

Thanks

over 7 years ago

0 Joel Jimenez0 over 7 years ago

TI__Mastermind 18655 points

Hello Teboho Ramakatsa ,
With no input the device will output the free-running PLL on ODCK. With no input, the state of the control and data output signals is unknown. Noise on the differential data inputs can be decoded as random data and therefore appears to change on the output as the free-running PLL output changes.
To avoid this situation SCDT pin should be connected to PDO.
Regards

0 Teboho Ramakatsa over 7 years ago in reply to Joel Jimenez0

Prodigy 70 points

Hi Joel

Thanks for the reply.

I sent you a private message with my schematic design, can you please review and give me feedback.

Thanks.

0 Joel Jimenez0 over 7 years ago in reply to Teboho Ramakatsa

TI__Mastermind 18655 points

Hello Teboho Ramakatsa,

The TFP401 seems set up correctly in the schamatics. I only suggest adding an option to tied SCDT to PDO pin in order to power down the output drivers when the link is inactive.

Regards

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TFP401A: LVDS_HDMI Bridge