TAS5828M: TAS5828M I2S single on off have pop noise

James Lin3

Part Number: TAS5828M
Other Parts Discussed in Thread: TAS5754M

Hi ,

We use TAS5828 for speaker design, after initial parameter speaker is normal, but when I2S single off or on, speaker have pop noise output, any solution for this case? We did not have this problem with TAS5754M before.

over 2 years ago

0 Luis Fernandes de Pina over 2 years ago

TI__Genius 14630 points

Hello James,

Is the I2S signal being turned off/on while the device is in play mode?

best regards,

Luis

0 James Lin3 over 2 years ago in reply to Luis Fernandes de Pina

Prodigy 10 points

Hi Luis,

Yes, TAS5825 is play mode, because we don't know when the audio source turned off/on the I2S signal, so we keep play mode.

0 Luis Fernandes de Pina over 2 years ago in reply to James Lin3

TI__Genius 14630 points

Hello James,

You are changing I2S signals and clocks while the device is in play so you will have click/pops, you need to put the device in mute or some other state to avoid this.

best regards,
Luis

0 James Lin3 over 2 years ago in reply to Luis Fernandes de Pina

Prodigy 10 points

Hi Luis，

I tried mute the device first, but there is still Pop noise when the I2S signal is ON (of course, because there is no music playing behind the mute state). it seems that mute can't solve the noise generated when the I2S signal is ON

0 Luis Fernandes de Pina over 2 years ago in reply to James Lin3

TI__Genius 14630 points

Hello James,

If you are removing I2S signals during device operation this pop noise can't be avoided, this is causing an error state on our device so it would be recommended to put the device in Hi-Z or a sleep mode as disabling the clocks will effect the PWM switching behavior.

best regards,

Luis

0 James Lin3 over 2 years ago in reply to Luis Fernandes de Pina

Prodigy 10 points

Hi Luis，

I tried set device to Hi-Z or sleep mode, when I2S on and set to play mode still have noise。

0 Shadow He over 2 years ago in reply to James Lin3

TI__Mastermind 37960 points

Hi James

When the I2S is back, is there audio data in SDIN line? Or there's only SCLK and LRCLK, no data in SDIN line?

Also may I know how do you listen to this pop noise? Do you connect your ear directly to the speaker to hear it?

0 James Lin3 over 1 year ago in reply to Shadow He

Prodigy 10 points

Hi Shadow，

SCLK and LRCLK is first output， data out have a little delay， The noise is heard from the speaker.

We received Demo board, connected speaker and use PurePath Console 3 control, we change device status to sleep mode play from sleep mode or change to sleep from play mode, heard noise too, but switch status on Hi-Z and play mode not noise. We will check this case

0 Shadow He over 1 year ago in reply to James Lin3

TI__Mastermind 37960 points

Hi James

From our experience, there should be no difference between you change Sleep/Play or HiZ/Play. Also if you stop I2S and give it back, it's also change between HiZ/Play. Anyway, the pop happens when you changing the state can't be completely eliminated. It caused by the DC offset voltage established or disappeared. The DC offset voltage rage is written in the datasheet, we control them between min/max value.

Audio

Audio forum

TAS5828M: TAS5828M I2S single on off have pop noise