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PCM6020-Q1: The issue of loud noise on PCM6020

dirk du
Prodigy 10 points
Part Number: PCM6020-Q1

For PCM6020 background noise,when we use noise gate, the noise is about 10uv, and on the contrary, it is about 200uv. This value is obviously too high. Can you help us analyze the reason? The MIC noise I found in the specification is 6.8uv

  • 0 in reply to dirk du
    TI__Expert 7575 points

    Hey dirk,

    Thanks for bringing this to our attention. While we look into this, allow 24-48 business hours for a response. Thanks.

    Ore. 

  • 0 in reply to Ore Ogundana
    TI__Expert 5385 points

    Hi Ore,

    May you kindly feedback on this E2E thread? My customer is facing some issues that will have impact on their schedule. 

    Thanks!

    Ethan Wen

  • 0
    TI__Expert 7575 points

    Hello Dirk,

    Are these measurements taken before or after noise gate was implemented? Describe the noise gate setup in relation to the pcm6260. Also describe the signal entering into the pcm6260 and how it is entering. 

    Ore. 

  • 0 in reply to Ore Ogundana
    Prodigy 10 points

    Hi Ore:

    1.According to the circuit diagram, we connect the analog output port of the Audio Precision to the PCM6020, enter the PCM6020 through PIN9 and PIN10, and then pass the TDM signal through DSP and POWER IC in turn. We test the output background noise of the power IC.

    2.Usage of noise gate:Filter in the DSP. When the input signal of the DSP is PCM6020, filter out the noise and signal below - 85db

    3.Why is it determined that the noise comes from the PCM6020? Because when the input signal of the DSP comes from A2B or SPDIF, it doesn't make much noise

    4.Before noise gate，test result is 200uv，after noise gate test result is 12uv，our spec is 150uv.I want to know why the background noise of the PCM6020 is so high during normal use.

    Thanks!

    Dirk

  • 0 in reply to dirk du
    TI__Expert 7575 points

    Thanks for the clarification dirk, this would be looked into. 

  • 0 in reply to Ore Ogundana
    Prodigy 10 points

    Hi Ore:

    Looking forward to your reply

    Thanks!

    Dirk

  • 0 in reply to dirk du
    TI__Mastermind 39235 points

    Hi Dirk,

    Today is a TI Holiday. You should expect an update from Ore within 48 hours from now.

    Please wait to reply unless we have failed to respond to you in a timely manner.

    Thank you for your patience,

    Jeff McPherson

  • 0 in reply to dirk du
    TI__Expert 7575 points

    Hi dirk, 

    Apologies for the late response. I am working with a team on this noise issue. 

    BR,

    Ore.

  • 0 in reply to dirk du
    TI__Expert 7575 points

    Hi Dirk,

    So you tested the output background noise of the powered IC. Please provide your schematic hooked up to your ic, and attach the FFT plot showing your noise floor in dBFS from your AP with the description of your input signal(single-ended? At what frequency? AC or DC coupling?).

    When formatting your test set up, make sure the TDM/DSP configurations are in sync for the PPC3 and AP. I mean this in terms of where the data packet starts:

    • Do you have a slot offset on the ppc3 format? 
    • Are you using the DSP format on the AP?

    Please consider these and clarify your set up so we could better help you. And look at this post on noise to see if it would help:

    e2e.ti.com/.../pcm6020-q1-noise-issue-even-though-the-input-line-has-been-removed

    Best regards,

    Ore. 

  • 0 in reply to dirk du
    TI__Expert 7575 points

    Hello Dirk, 

    It is difficult to determine if these suggestions helped you figure out your issue. If you can, please confirm.

    Thanks,

    Ore.