• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 882 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV320AIC3268: Single-ended line out and differential line out simultaneously

Steven Weng1
Expert 2200 points
Part Number: TLV320AIC3268
Other Parts Discussed in Thread: DRV632

Hi TI,

There are two output on our custom board: one is single-ended stereo output HPL/HPR and the other is differential stereo output LOL/LOR, RECP/RECM.

These two output could not use simultaneously in AIC3268. We must select one route to DAC output.

If we need two output(single-ended and differential) simultaneously and modify the hardware design that split LOL(Right channel P) and RECP(Left channel P) to singled-ended output  instead of HPL/HPR.

Is it OK? I am concern about output load impedance.

I am new to this. Could you give some suggestions? or could I add other chips to achieve this goal?

Thank you very much!

  • 0
    TI__Guru 57800 points

    Hi, Steven,

    The approach you are mentioning is not recommended; when the device is configured in differential output mode, the signal is expected to return through the negative output.

    The DAC outputs could be routed at the same time to both headphone drivers and LINE/REC outputs, can you try this? please refer to below simplified diagram as reference.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Expert 2200 points

    Hi Diego,

    Very thank for your quick reply.

    The output route you mentioned is the output route setting on our board now.

    And there is a configuration for user setting in our GUI:  single-ended output mode or differential output mode.

    If user choose single-ended mode, DAC is only route to HPL/HPR. In differential mode, DAC is only route to LOL/LOR,RECP/RECM.

    It cant route at the same time. Please see below register.

    In register 22, set D5 bit for routing RDACP to LOL driver only when B0_P1_R27_D4=0(means RDACP cant route to HPR)

    It seems we need set the output route as differential mode and do some hardware modification for the single-ended output derived from differential output.

    Any advice and suggestions will be greatly appreciated.

    Thanks again

    BR,

    Steven

  • 0 in reply to Steven Weng1
    TI__Guru 57800 points

    Hi, Steven,

    Thanks for the clarification, I missed that note. Unfortunately, I have not seen an application like this so I am afraid I don't have a good suggestion for you. Perhaps a differential to single-ended line driver like the DRV632 can be added in parallel to the differential output. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer