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Old 27th April 2012, 12:32 AM   #1
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Default how to make pcm1704x4 to output balanced signal?

I'm making a pcm1704 dac, is there anyone can tell me how to make it output balanced signal?
Thanks.
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Old 27th April 2012, 02:45 AM   #2
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Yes. The PCM1704 is a mono DAC, so you will need two of them per channel. Set the phase of one PCM1704 as non-inverting, and set the phase of the other PCM1704 as inverting. The PCM1704 is unique in that it allows it's absolute phase to be set via a dedicated control pin, making this all very easy to implement.
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Last edited by Ken Newton; 27th April 2012 at 02:48 AM.
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Old 27th April 2012, 02:06 PM   #3
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Thank u!
I'll try it.
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Old 27th April 2012, 03:47 PM   #4
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As an alternative, you might want to consider the quad PCM1704 DAC module soon to be offered by AD Labs. It features balanced current outputs intended to feed I/V conversion and analg output circuits of your choice. QUAD PCM DAC (RD30) | AD LABS
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Old 29th April 2012, 02:30 PM   #5
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any schematic ?

Is It really needed a single dac chip per phase for a balanced output dac
I have read that that Is a wrong conception
there are many balanced output dacs with a single dac chip per channel
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Old 29th April 2012, 03:46 PM   #6
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for this dac, yes as its a mono dac chip
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Old 29th April 2012, 09:09 PM   #7
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Quote:
Originally Posted by samoloko View Post
any schematic ?

Is It really needed a single dac chip per phase for a balanced output dac
I have read that that Is a wrong conception
there are many balanced output dacs with a single dac chip per channel
The answers to your questions will become rather self-evident once you examine the PCM1704's datasheet.
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Old 1st May 2012, 12:30 AM   #8
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Quote:
Originally Posted by samoloko View Post
Is it really needed a single dac chip per phase for a balanced output dac?
It is not; figure 3 in the LME49274 datasheet is a good starting point.
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