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TPA2000D1-Q1: power/GND/IO noise

user5029190
Prodigy 185 points
Part Number: TPA2000D1-Q1
Other Parts Discussed in Thread: TPA2000D1

dear TI:

  I'm currently evaluating the TPA2000D1 amplifier in an audio application similar to  smartphone.now I'm having issues with some  noise coming out of the TPA2000D1.

  the noise  interferes with all the signal lines,such as power,GNDI,/O.As long as I enable PA, the noise will occur. The frequency of noise is about 500K.I think it was produced by ROSC pin.

 Anybody got any idea why I have this noise and how can I remove it? 

  following picture1 is the nosie on VDD, picture2 is schematic.

 thanks！

  • 0
    TI__Mastermind 20085 points
    Hello,

    Welcome to E2E, thanks for your interest in our products.
    It seems to be decoupling problems. It is always recommended to use two decoupling capacitors the first one should be of 1uF for high-frequency transients, spikes, or digital hash on the line and the second one should be of 10uF or greater for filtering lower-frequency noise, both should be placed as close as possible to the device and should be good low ESR ceramic capacitors.
    Could you provide me the schematic of your application and Layout PCB?

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Prodigy 185 points

    Hello:

     thanks for you reply，i use two 10uf capacitors on pin pvdd,but the noise Still exist，even i Parallel multiple 10 uf capacitors，Noise is still present.

     following pictures are schematic，PCB and My board。

     thanks very much!

  • 0 in reply to user5029190
    TI__Mastermind 20085 points

    Hi,

    The decoupling capacitors should be added all the power supply pins.
    This problem could also be caused by Out-of-Band Noise since you mentioned that the noise frequency is 500 kHz. You could add a small, low pass RC filter in the amplifier's input in order to reduce the out-of-band noise. You can refer the next application report: Out-of-Band Noise Measurement Issues for Audio Codecs to find further information about this.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer

  • 0 in reply to José Luis
    Prodigy 185 points

    dear sir:

      I add a small low pass RC filter in amplifier's output，The noise has been reduced a lot.

      thanks very much for your support!

      Best regards！