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TPA6120A2: Recommended wiring of PCM5102A > TPA6120A2!

Neil Henry
Intellectual 965 points
Part Number: TPA6120A2
Other Parts Discussed in Thread: PCM2706C, PCM5102A, , PCM5242

HELLO:

SYSTEMS DESIGN FLOW:-

PCM2706C > PCM5102A > TPA6120A2

Kindly recommended wiring for the DAC PCM5102A to the HPA TPA6120A2. This is a split power supply \ 12V design.

Note the design works, however the auxiliary output is not balance.

The left speaker louder than the right speaker. Also on the headphone, right is weak!

Please provided recommended wiring for the DAC PCM5102A to the HPA TPA6120A2. Trying to get the optimal sound quality for these devices.

SCENARIOS:

1. DAC PCM5102A  => HPA TPA6120A2 => Speaker

2. DAC PCM5102A  => HPA TPA6120A2 => Headphones

Regards,

Neil Henry
IRAD LLC

  • 0
    TI__Guru** 103925 points
    Hi Neil,

    Is there a schematic you can share so we can take a look?
    Is right channel weak only at the output of TPA6120A2? Or is it weak at the output of PCM5102A too?
    TPA6120A2 is a differential input device, while PCM5102A is a single-ended output device. Are you using the same (positive or negative) input of each channel?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Guru** 103925 points

    Neil,

    BTW, I forgot to mention that in TPA6120A2 data sheet, page 14 (

    http://www.ti.com/lit/ds/symlink/tpa6120a2.pdf#page=14

    ) there is an example application that interfaces PCM5242 to TPA6120A2.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • 0 in reply to Ivan Salazar
    Intellectual 965 points

    Hi Ivan,

    Kindly see the schematic.

    The right channel is weak at the output of TPA6120A2 and at the output of PCM5102A too. The left channel seems predominant, over-powering the right channel at the output.

    Best Regards,

    Neil Hnery

    RE: schematic inspired!

  • 0 in reply to Ivan Salazar
    Intellectual 965 points
    Not sure where to connect the LIN- AND RIN- however I have the circuit wire as in the schematic!

    Looking for the optimal connection for the while PCM5102A is a single-ended output device.
  • 0 in reply to Ivan Salazar
    Intellectual 965 points
    Yes using the same (positive or negative) input of each channel. Please see the schematic, however not sure on the RIN- AND LIN- on best wiring for this setup while PCM5102A is a single-ended output device.
  • 0 in reply to Neil Henry
    TI__Guru** 103925 points

    Neil,

    The schematic looks good. I think the current connection of xIN- is correct, although I'll double check.
    However, you've mention that the right channel signal is weak even at the output of PCM5102A, have you verified that this device connections are OK? I can ask the responsible team of this device to take a look, if needed.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • 0 in reply to Ivan Salazar
    Intellectual 965 points

    Ivan,

    Thank you for the review.

    I have double checked all the connection, however the same as before.

    Kindly have the device team check-it-out, another set of eyes as you suggested!

    Most appreciative!

    Regards,

    Neil Henry

    IRAD

  • 0 in reply to Neil Henry
    Intellectual 965 points

    Hello Ivan,

    Any word from the Device team!

    Regards,

    Neil Henry

    IRAD

  • 0 in reply to Neil Henry
    TI__Guru 53623 points
    Hi Henry,

    Your schematic looks okay to me.

    Try disconnecting the TPA circuit from the PCM and verify the amplitude output of the PCM5102A again - this will remove any potential problems with the TPA from affecting the PCM. If it is still unbalanced, verify that the values populated on R6, R7, C1, and C2 are correct. Next, I would check your digital source to see if there is some imbalance there as well.

    Thanks!
    Paul
  • 0 in reply to Neil Henry
    TI__Guru** 103925 points
    Paul - Thanks for your inputs.

    Neil,
    Do you have any more comments? Can we consider this as closed?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators