how to make pcm1704x4 to output balanced signal?

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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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