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TLV320AIC23B: Thump at startup

Dara Ros
Prodigy 20 points
Part Number: TLV320AIC23B
Other Parts Discussed in Thread: TLV320AIC3104

Hi there,

I am currently working on a project dealing with the TLV320AIC23B. I am using the LOUT pin for outputting signal to an amplifier (also have a high-pass filter in between). Every time I turn on, there's always a thump of approximately 0.2 to 0.3V then logarithmically rises to 1.66V (which is the Vref). We don't this behavior at all since it would make a thump for an audio application.

My question is that is that possible at all to have a smooth offsetting at the line output when turning on.

Best regards,

Dara

  • 0
    TI__Mastermind 30210 points
    Dara,

    If you are going to an amplifier it might be ideal to keep the amplifier muted during power up.
    I'm curious, if you toggle Bit 7 of the power down control register (shutdown) do you hear the pop?

    This is also a very old device, I would recommend similar newer devices that have far better performance and lower cost. for example the TLV320AIC3104.

    best regards,
    Steve Wilson
  • 0 in reply to Steve-Wilson
    Prodigy 20 points
    I appreciate your response, Mr. Wilson.

    I would be great if I had control over amplifier, but I don't. I do not see or hear the pop when powering down.

    Thanks for the suggestion. I will look into it for a future modification/improvement.

    Best regards,
    Dara Ros
  • 0 in reply to Dara Ros
    TI__Mastermind 30210 points

    hello Dara,

    Interesting, so when you power down and then power back up using the power down control register, you do not get the pop?  I wonder if it would be possible to quickly put the device in shutdown as part of the initialization,  then power it up after a short delay?

    Best regards,
    -Steve