Differential output DACs, can I use only one output.

oon_the_kid · 17th June 2011, 01:45 AM

I have a AD1853 DAC differential output current DAC. Can I check if it is okay to use only one of the current output instead of both the outputs as a single ended output DAC?

Thanks.

Oon

esangenisd · 18th June 2011, 05:32 AM

I use only one ouput i+ r+ to a resistor to a srpp and is playing music really nice. The bad thing is that i only get 2 miliamps at output and not 4 ma in differential.

abraxalito · 18th June 2011, 05:57 AM

That's an interesting point yeah. It makes me wonder if we couldn't use the other channel in an interesting way to get back to the 4mA again. Just thinking aloud here, don't know if this will work but have you heard of mid-side format for stereo?

qusp · 20th June 2011, 05:29 PM

wouldnt you just use some form of instrumentation amp to get SE output using all of the DNR?

ThorstenL · 20th June 2011, 07:05 PM

Hi,

Quote:

Originally Posted by oon_the_kid

I have a AD1853 DAC differential output current DAC. Can I check if it is okay to use only one of the current output instead of both the outputs as a single ended output DAC?

Yes, you can, one caveat, make sure you load both outputs equally, also, you may have to return the I/V resistor to Vref, not ground to make sure the DAC works correctly.

Ciao T

oon_the_kid · 21st June 2011, 04:13 PM

What do you mean load the output equally? How would you do that?

Oon

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ThorstenL · 21st June 2011, 05:08 PM

Hi,

Quote:

Originally Posted by oon_the_kid

What do you mean load the output equally? How would you do that?

Sorry, I spoke out of turn, never mind.

Ciao T

oon_the_kid · 25th June 2011, 05:09 PM

Huh, what do you mean spoke out of turn? Not sure what you mean by that, but an apology is definitely not needed. How did you say I should load them equally?

Oon

TV Man · 25th June 2011, 09:10 PM

oon,
I believe what Thorsten meant was to make sure to use the same impednace on both the + and - outputs of your DAC chip. If you're taking signal from the + line and it's loaded with 3k ohms for example also put 3k ohms across the - output even if you don't take any signal from there. The DAC chip will work best with equal resistance on both output phases.

oon_the_kid · 28th June 2011, 11:13 AM

Ok, that makes sense, so if I use it on a normal op amp based I/V stage with a voltage at 2.5V, I would then connect the other ouput differential to a 2.5V source as well... correct...?

Oon

17th June 2011, 01:45 AM	#1
oon_the_kid diyAudio Member Join Date: May 2008	Differential output DACs, can I use only one output. I have a AD1853 DAC differential output current DAC. Can I check if it is okay to use only one of the current output instead of both the outputs as a single ended output DAC? Thanks. Oon

18th June 2011, 05:57 AM	#3
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	That's an interesting point yeah. It makes me wonder if we couldn't use the other channel in an interesting way to get back to the 4mA again. Just thinking aloud here, don't know if this will work but have you heard of mid-side format for stereo? __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

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18th June 2011, 05:32 AM	#2
esangenisd diyAudio Member Join Date: Oct 2009	I use only one ouput i+ r+ to a resistor to a srpp and is playing music really nice. The bad thing is that i only get 2 miliamps at output and not 4 ma in differential.

20th June 2011, 05:29 PM	#4
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	wouldnt you just use some form of instrumentation amp to get SE output using all of the DNR?

21st June 2011, 04:13 PM	#6
oon_the_kid diyAudio Member Join Date: May 2008	What do you mean load the output equally? How would you do that? Oon Sent from my Milestone using Tapatalk

25th June 2011, 05:09 PM	#8
oon_the_kid diyAudio Member Join Date: May 2008	Huh, what do you mean spoke out of turn? Not sure what you mean by that, but an apology is definitely not needed. How did you say I should load them equally? Oon

25th June 2011, 09:10 PM	#9
TV Man diyAudio Member Join Date: Dec 2002 Location: US	oon, I believe what Thorsten meant was to make sure to use the same impednace on both the + and - outputs of your DAC chip. If you're taking signal from the + line and it's loaded with 3k ohms for example also put 3k ohms across the - output even if you don't take any signal from there. The DAC chip will work best with equal resistance on both output phases.

28th June 2011, 11:13 AM	#10
oon_the_kid diyAudio Member Join Date: May 2008	Ok, that makes sense, so if I use it on a normal op amp based I/V stage with a voltage at 2.5V, I would then connect the other ouput differential to a 2.5V source as well... correct...? Oon