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Commercial DAC output voltage.
Commercial DAC output voltage.
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Old 24th February 2019, 11:57 PM   #1
oon_the_kid is online now oon_the_kid  Malaysia
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Default Commercial DAC output voltage.

Hi,

I was designing and amp on day and I wanted to figure out what is the commercial output DAC output?

On checking it out it seems to be 2Vrms. However by standard conversion that would be almost 6V p-p. Is that correct?

I even see that from usb DAC where supply is only 5V.

Is there something wrong with the calculations. Is the Vrms from DACs calculated differently...?

Oon
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Old 25th February 2019, 12:49 AM   #2
Ken Newton is offline Ken Newton  United States
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Yes, 2VRMS is the standard, but only by popular convention. Yes, that's nearly 6V pk-pk. This level of peak-peak output can also be achieved from an 5V supply by employing differential output operation.
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Old 25th February 2019, 02:42 AM   #3
BesPav is offline BesPav  Russian Federation
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Quote:
Originally Posted by oon_the_kid View Post
I wanted to figure out what is the commercial output DAC output?

+4 dBu - “pro” equipment

-10 dBv - “consumer” equipment
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Old 25th February 2019, 05:52 AM   #4
oon_the_kid is online now oon_the_kid  Malaysia
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What does that mean?

Oon
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Old 25th February 2019, 06:36 AM   #5
BesPav is offline BesPav  Russian Federation
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Line level - Wikipedia
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Old 25th February 2019, 06:54 AM   #6
oon_the_kid is online now oon_the_kid  Malaysia
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Hi Bes,

Thanks for the link. Always wondered what they mean. -10dbV is listed as about 300mVrms. However I believe most DACs list their output as 2Vrms that is more like 6dbV.

The reason I am asking this is because I can't imagine what happens inside pre amps because if it is not designed to handle 6Vp-p, it would most certainly saturate.

The only to handle this is the volume control must be the first thing it sees. So no clipping occurs in subsequent stages. Any thoughts?

Oon

Oon
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Old 25th February 2019, 07:27 AM   #7
BesPav is offline BesPav  Russian Federation
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Quote:
Originally Posted by oon_the_kid View Post
The only to handle this is the volume control must be the first thing it sees. So no clipping occurs in subsequent stages. Any thoughts?

Clearly!
They usually drop out dynamical range and diesn’t provide ultra-low input noise.
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Old 25th February 2019, 11:57 AM   #8
lcsaszar is online now lcsaszar  Hungary
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Only a source selector is necessary w/o gain. Or perhaps a unity gain buffer.
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Old 25th February 2019, 12:01 PM   #9
BesPav is offline BesPav  Russian Federation
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Originally Posted by lcsaszar View Post
Only a source selector is necessary w/o gain. Or perhaps a unity gain buffer.


You are really need an input stage with high CMRR and low noise, while gain and sensitivity are very secondary parameters.
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Old 25th February 2019, 08:48 PM   #10
MarcelvdG is offline MarcelvdG  Netherlands
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Quote:
Originally Posted by oon_the_kid View Post
-10dbV is listed as about 300mVrms. However I believe most DACs list their output as 2Vrms that is more like 6dbV.
That -10 dBV is supposed to be a nominal level, while 2 V is usually the maximum level (not taking into account so-called intersample overshoots). Similarly, a professional mixing desk usually has a nominal level of +4 dBu, but only starts clipping somewhere around +24 dBu.
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