• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 30 subscribers
  • Views 1021 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPA2028D1: Pop Noise and White Noise Issue

Jake Jung
Expert 1915 points
Part Number: TPA2028D1

Hi Ti.

My Customer is designing using TPA2028D1.

They are going to use 4Ohm Speaker and 16dB Gain.

Audio source is analog.

Please refer to attached schematic and register setting.

They has two noise issues.

1. When Audio is started, pop noise is occurred like "TIC"

2. When volume is 0, white noise is occurred like "CHI~~~"

How can I remove these noises?

Please let me know some hints or debugging point.

  • 0
    TI__Mastermind 20085 points
    Hi SS Jung,

    1) When you mention that the audio is started, Do you mean the power supply is applied or shut down pin is tied to Vdd?
    2) I noticed that the device is just using one decoupling capacitor of 10uF. It is always recommended to add another decoupling capacitor of 1uF as this choice of capacitor helps with higher frequency transients, spikes, or digital hash on the line. Both decoupling capacitors should be placed as close as possible to the device in order to work properly. I think this could be causing the white noise.

    Best Regards
    José Luis Figueroa
    Applications Engineer
  • 0 in reply to José Luis
    Expert 1915 points
    Hi Jose. Thanks.

    1) Before audio started, power supply is applied and EN is enabled.
    AMP is ready and then audio started, pop noise is occurred.
    2) I agree your opinion. So I already tried to add 1uF decoupling capacitor and change value of decoupling capacitor.
    But white noise still exist.
    Is there another debugging points?
  • 0 in reply to Jake Jung
    TI__Mastermind 20085 points
    SS Jung,

    1) You set the audio signal immediately after of applying power supply and En pin is enabled, don't you? if so, I recommend you to set the audio signal after of some milliseconds, this could help to eliminate the pop noise. Another way to eliminate pop noise is to reduce the input capacitors value.
    2) Make sure that the capacitors are made of materials with temperature coefficients of X5R, X7R or better and tolerance should be lower than or equal to 10%.

    Best Regards
    José Luis Figueroa
    Applications Engineer