• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 32 subscribers
  • Views 1123 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS5760M noise

KesTam
Genius 9550 points

Other Parts Discussed in Thread: TAS5760M

Hello Audio Folks, I have a customer using TAS5760M. They have encounter a background noise issue. Interestingly, it is only on channel A. It is perfectly silent for channel B.

I have worked with customer to isolate the possible source of noise like supply and input. Unfortunately, it still cannot fix.

So, I take back customer's board to TI office to debug. Right now, I have tried to isolate the TAS5760M from the other parts of the circuit. I use external supply to both TAS5760M 3.3V and PVDD (I use 12V for PVDD). I connect the I2S and I2C to our Purepath Motherboard. I have able to use PPC1 to do control and output sound. For this setup, only TAS5760M is running. Every other thing is isolated. But, very unfortunately, the problem is still there. I just don't understand. Looks like the only possibilty is the noise is from IC internal. Is there anyone can help?

Regards,

Kes

  • 0
    TI__Guru 57800 points

    Hi, Kes,

    This seems to be related to a board issue, did your customer changed the IC in the board?, also, If possible, could you test the IC with the noise in the EVM? it would be good to have the schematic and layout, if available can you please send them to me via email?. Any other information you have would be useful, as the operation mode, PVDD, noise frequency, etc. 

    Thanks and Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    TI__Genius 9550 points
    Hi Diego, the issue is finally confirmed to be the IC issue. Customer has made a second version board and using new IC, then, it is OK. If putting the new IC back to the old version one board, there is also no noise. This means the problem is on the old IC.

    For the old IC, customer is not getting from TI but brought from outside. It is because we gave them 48 pin IC but their board is 32 pin. Due to very tight schedule at that time, they don't wait for us but brought IC from outside (don't know the source). So, the IC should have problem.

    Regards,
    Kes
  • 0 in reply to KesTam
    Prodigy 100 points

    Hi Diego,

    We have just encountered the same issue where channel A is noisy (TAS5760M, 32Pins version).  In our case the whole batch of 5 prototype boards each equipped with 3 amplifiers are behaving the same.  We have first believe that it was a PCB design issue until we decided to change the 3 TAS5760 on one of the board, which fixed the problem.  We had multiple prototypes boards made in the last year with no issue.  

    We are looking to go into production with the TAS5760 soon, what can be done to guaranty that we won't end up with throw away boards?

    Regards,

    Michel

  • 0 in reply to gali12345
    Prodigy 100 points

    Hi,

    Can anyone from TI tell me if they have quality control tests to guaranty that the noise level is within specifications?  How can this IC problem be explained?, how can this be avoid for our future production boards?

    Sorry for the multiple questions but this issue is a real show stopper for us, any help would be apreciated.

    Regards,

    Michel