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TAS2505: Noise at SPK output driver switch off

John Hulst40
Prodigy 240 points
Part Number: TAS2505

My question is related to the following register:
Page 1 / Register 45: Speaker Amplifier Control 1 - 0x01 / 0x2D
  D1 R/W 0 Speaker Driver Power
     0: SPK output driver is powered down
     1: SPK output driver is powered up

I manipulate the SPK output driver to reduce EMC transmission.

I switch on the SPK output driver before playing a sound. D1=1, Unmute, start I2S CLKs

After the sound I Mute the audio, Stop the I2S CLKs and  switch off the SPK output driver again D0=0

When I switch the SPK output driver off there is short noise audible.

I would like to know how to get rid of this short noise.

  • 0
    TI__Guru** 109315 points
    Hi John,

    With short noise you mean something like pop noise?
    Perhaps you can mute the DAC and/or SPK driver prior to powering off the SPK driver.
    DAC mute is controlled through Page 0 Reg 0x40 bit D3 =1
    SPK mute is controlled through Page 1 Reg 0x30 bits D6-D4=000

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Prodigy 240 points
    Hi Ivan,
    Thank you for your reply.
    Yes I was referring to pop noise. This is only present when powering off speaker driver.
    In the current implementation I am only muting with register 0x40 at page 0, setting it at 0x0C. This does not help reducing the noise pop.

    Next step, I will test your idea for the SPK mute: Page 1 Reg 0x30 bits D6-D4=000

    Best regards,

    John