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LM4675SDBD: Output audio noise.

Kengo.Y
Guru 10965 points
Part Number: LM4675SDBD
Other Parts Discussed in Thread: LM4675, PCM2903C

Hi team,

My customer is suffering from output audio noise.
It consists of the following circuits, and noise is disappeared by OPEN the IN-pin.
What is the effect of opening the IN-pin?
Do you think the cause of the noise is the noise from GND?



And then, the speaker heats up when there is no sound.
What is the cause of this?

Sincerely.
Kengo.

  • +1
    TI__Guru** 106615 points

    Hi Kengo,

    Perhaps there is some high frequency content, causing both heating and noise.
    Have you tried using a filter between PCM2903C and LM4675? RC low-pass filter should be OK.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators