TMDS181: How to deal with SPDIF_IN pin when ARC is unused

Hideki Hayashi1

Part Number: TMDS181

Hi team,

How does customer deal with SPDIF_IN pin when ARC is unused?

Typical application in the datasheet (9.2.1 Source Side Application ) suggest 500k ohm pull-down. If this pin is floating, is there any problems?

Best regards,

Hayashi

over 3 years ago

0 David (ASIC) Liu over 3 years ago

TI__Guru**** 177676 points

Hayashi-san

SPDIF_IN must have ~500K resistor to ground to prevent excess current consumption.

Thanks

David

0 Hideki Hayashi1 over 3 years ago in reply to David (ASIC) Liu

TI__Expert 8400 points

Hi David,

The concern is only increase of current consumption, right? Is there any rush current flow into SPDIF_IN from Vcc or Vdd, then device will be broken?

Best regards,

Hayashi

0 David (ASIC) Liu over 3 years ago in reply to Hideki Hayashi1

TI__Guru**** 177676 points

Hayashi-san

I need to spend some time to take a deeper look into this. Is the customer actually seeing an issue with the SPDIF_IN when they leave it open?

Thanks

David

0 Hideki Hayashi1 over 3 years ago in reply to David (ASIC) Liu

TI__Expert 8400 points

Hi David,

Not yet. Just a concern to keep the pin floating.

Regards,

Hayashi

0 David (ASIC) Liu over 3 years ago in reply to Hideki Hayashi1

TI__Guru**** 177676 points

Hayashi-san

We only looked at the SPDIF_IN floating that will cause high current consumption, but we never looked at the SPD_IF floating that will cause any device damage.

I would recommend that we follow the TMDS181 datasheet recommendation and have it pulled to ground through a ~500k resistor.

Thanks

David

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TMDS181: How to deal with SPDIF_IN pin when ARC is unused