HDMI Audio Voltage Spec - AVS Forum
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Old 05-20-2013, 12:04 PM - Thread Starter
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From what I can research AES/EBU has an output voltage that ranges between 2V and 7V with a maximum of 7V and S/PDIF has an output voltage of 0.5V with a maximum of 0.6V (all peak to peak).

Does anyone know what is the output voltage of HDMI audio from a BD? Could not find any specs with google. Just curious.
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Old 05-20-2013, 12:55 PM
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You mean the digital TMDS signal? For HDMI 1.3, termination is to 3.3 V and swing is 400 to 600 mV single-ended into 50 ohms (800 to 1200 mV into 100 ohms differential). The 1.4 spec is not available as a free download.

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Old 05-20-2013, 12:59 PM
 
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Audio is interleaved with video and control signals, there isn't really an HDMI audio signal.
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Old 05-20-2013, 02:30 PM - Thread Starter
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Quote:
Originally Posted by DonH50 View Post

You mean the digital TMDS signal? For HDMI 1.3, termination is to 3.3 V and swing is 400 to 600 mV single-ended into 50 ohms (800 to 1200 mV into 100 ohms differenital). The 1.4 spec is not available as a free download.

Thanks. Very helpful.

I thought all the TMDS signals are balanced. What would be an example of a single ended HDMI termination?
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Old 05-20-2013, 02:30 PM
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@SAM64: Isn't ARC on its own pair? Don't really know, not an HDMI guru or even all that knowledgeable, just curious. I thought the OP might mean ARC at first then realized it was (probably) the serial digital interface signals.

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Old 05-20-2013, 02:32 PM
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Quote:
Originally Posted by GGA View Post

Quote:
Originally Posted by DonH50 View Post

You mean the digital TMDS signal? For HDMI 1.3, termination is to 3.3 V and swing is 400 to 600 mV single-ended into 50 ohms (800 to 1200 mV into 100 ohms differenital). The 1.4 spec is not available as a free download.

Thanks. Very helpful.

I thought all the TMDS signals are balanced. What would be an example of a single ended HDMI termination?

They are balanced but the spec provides SE and diff levels. That is typical with differential signaling as you must also specify the absolute range the transceivers must abide.

In this case, there are a pair of 50-ohms R pulled to 3.3 V that present a 100-ohm differential impedance.

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