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PCM2904: Headphone Output

Sadanori Kato
Guru 36490 points
Part Number: PCM2904

Hi,

Should the active low pass filter be added to the signal output path if using VOUTL and VOUTR as the headphone output ?
In addition, is a click sound heard if using PCM2904 without the active low pass filter ?

Best regards,
Kato

  • 0
    TI__Guru 57800 points

    Hi, Kato-san,

    The Analog outputs of this device are targeted for line applications, so they cannot be used as headphone drivers. For a headphone application, an external headphone amplifier should be used. 

    For this application, the click and pop suppression may be implemented on the amplifier stage. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Guru 36490 points

    Hi Diego-san,

    Thank you for your prompt reply.

    I haven't received any comments about this point from you when asking you to review customer's schematic which is used the headphone jack in the past, so the active filter isn't applied to PCM2904.
    Is this noise improved by applying the active filter ?

    Best regards,
    Kato