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TAS5754M: TAS5754M pop

KesTam
Genius 9550 points
Part Number: TAS5754M

Hello Audio Folks, a customer is using TAS5754M and encounter a pop noise issue when playing/stopping a sound output. It is Android system. Pops are in each key click and beginning of a song/music.

Customer finds that even they dis-connect the DAC output (DAC_OUTA/DAC_OUTB) and amp input (SPK_INA+/SPK_INB+), the pop noise are still there.


I have asked them to check the IC output pin. There is no PWM in idle. This means the pop should be due to PWM starting/stopping. I have asked the customer to disconnect I2C control after init. The problem is still there. Also, there is no control on SPK_MUTE. So, the conclusion is that I2S makes PWM on/off.


The question is how I2S to trigger PWM on/off. I know there is auto-mute. I will go to ask customer to disable the auto-mute with P0-R65. Other than this, is there other I2S related like clock error will cause this?

Regards,


Kes

  • 0
    TI__Guru 57800 points

    Hi, Kes,

    This device starts streaming audio as soon as valid I²S input signals are provided and power supplies are stable. You might try also disabling clock detection in register P0-R37 to identify of the issue is related to a clock error. You can also suggest to change the Ramp down time when a clock error is detected via register P0-R64.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    TI__Genius 9550 points
    Hi Diego, thanks for reply. Is it possible to keep the amp PWM running even for clock error or no clock? I think the amp portion is something like TPA3118. There should be no need to stop PWM even for clock error. It only needs to ramp down DAC output.

    For customer issue, they do see there is no PWM in idle.

    Regards,
    Kes