TLV320AIC3262: Speaker hissing when amplifier enabled, clicking sound when amplifier enabling/disabling

Part Number: TLV320AIC3262

We are hearing a constant hissing noise from the speaker when the amplifier is enabled in the AIC3262.

When the amplifier is disabled there is no hissing noise.

Also we hear a clicking sound when the amplifier is enabled or disabled.

Here is the schematic for the speaker:

7 Replies

  • Hi, David,

    The hissing sound can be related to different reasons, so it is important to know what is the device configuration and what is the source for the  amplifier itself. I assume you are using the same process flow you shared before, can you confirm?.

    The click sound may be related to the sequence used to power the amplifier ON or OFF, can you please share the register writes used to power the amplifier On and OFF?.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • In reply to Diego Melendez:

    Hi Diego,


    Yes, the hiss is still there even with the latest configuration provided in private message.

    P1_R45_D0 and P1_R45_D1 are the registers we use.

    It looks like even mute is not enough to stop the hiss! We can hear the hiss even when the amplifier are not connected to any source (like MAL, LOL, MAR, LOR).
  • In reply to David-D-Jones:

    Hello - any thoughts on this? Thanks.
  • In reply to David-D-Jones:

    Hi, David,

    Sorry for the delay. This is not an expected behavior, the output of the amplifier should be OFF when muted; this suggests that somehow the noise is being generated within the amplifier. I will try to replicate the problem with an EVM. Do you have a scope capture of the hiss noise you are getting?.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • In reply to Diego Melendez:

    Hello Diego Melendez (4117384) - have you managed to reproduce the two issues and do you have any suggested fixes for us?

    Issue 1: Constant hiss through the speaker when the amplifier is enabled. The hiss stops when the amplifier is disabled. The hiss is present even when the amplifier is not connected to any audio source.

    Issue 2: A loud clicking sound is produced when the amplifier is disabled or enabled.

    I will try to get a scope capture of the hiss and clicks. Our circuit is very simple and the diagram has been provided. Also I've sent you our configuration in a private message.

    Thanks for your help, I hope this can be resolved soon.

  • In reply to David-D-Jones:

    Hello , do you have any update on these two issues reported some time ago?

    Issue 1: Constant hiss through the speaker when the amplifier is enabled. The hiss stops when the amplifier is disabled. The hiss is present even when the amplifier is not connected to any audio source.

    Issue 2: A loud clicking sound is produced when the amplifier is disabled or enabled.

    Our circuit design is very simple. A diagram is provided below. A copy of our device configuration has been provided via private messaging.

    Thanks.

  • In reply to David-D-Jones:

    David,

    Sorry for the delayed response I  haven't been able to reproduce this issue in the EVM yet, but will perform some tests and will provide my feedback as soon as possible. 

    Best Regards,  

      -Diego Meléndez López
       Audio Applications Engineer