TAS5782MEVM: Unable to Playback Audio

Hello Kato-san, Roy can help you with your question. Thanks, Jeff

Hi Roy-san,

Thank you for your quick response.

I will try to verify TAS5782MEVM with the maximum volume and get back to you.
TAS5782MEVM is used with the default setting, so could you please give me your advice about the root cause for this pop noise which I found if possible ?

Best regards,
Kato

Hi Roy-san,

As you said, the error of "Unable to playback audio" is clear when verifying TAS5782MEVM with the maximum volume.
However, the pop noise issue keeps occurring for OUTB+/- outputs, so the captures which I got are showns as below.
This pop noise issue doesn't occur by setting TAS5782M to the standby mode or the power-down mode.
Could you please give me your advice about it ?
* yellow : OUTB+, bule : OUTB-, purple : OUTA+, green : OUTA-
* PVDD = 12V, Configuration = stereo 2.0, Load Impedance = 8ohm

- run "System Checks"

- run "Tuning and Audio Processing"

- set to standby mode or power-down mode

Best regards,
Kato

Hi Kato,

It seems that there could be errors occurring when you're running the above measurements.

Please connect a probe to testpoint "FAULT1" to see if it's pulled low on your EVM.

Thank you!

Best regards,
-Roy Hsu
Texas Instruments

Hi Roy-san,

Thank you for your advice.
I will observe the testpoint of "FAULT1" on the TAS5782EVM tomorrow and get back to you.

Best regards,
Kato

Hi Roy-san,

I got the following capture for the testpoints of "FAULT1" and "FAULT2" on the TAS5782EVM.
As you said, the /SPK_FAULT(FAULT1) pin is asserted to low and this period is 1.376s, so it seems that TAS5782M detects OCE or OTE although the appearance is no problem.
Could you please tell me how to investigate the root cause and how to improve this issue ?

* yellow : OUTB+, bule : OUTB-, purple : FAULT2, green : FAULT1

Best regards,
Kato

Hi Kato,

I think it's unlikely to be OTE since you were just running System Calibration.

To find out the root cause, we would need to look at a few things:

1. Impedance of the speaker ( Have you also tried with different speakers?)

2. Speaker Configuration: What is your configuration and have you connected it correctly? ( Please attach a photo of your connection)

3. Are jumpers J10 and J11 placed properly according to the speaker configuration?

Let's see if we can find some clue out of the above. Thank you.

Best regards,

-Roy Hsu

Texas Instruments

Hi Roy-san,

Thank you for your support.

Please see my comments as below.

Q1
Yes, this issue occurs even if changing the load impedance.

Q2 & Q3
Please see the following pictures and check them.

Could you please give me your advice ?

Best regards,
Kato

Hi Roy-san,

Thank you for your reply.

This pop noise issue occurs even if using a shorter cables.
As I mentioned above, it keeps occurring after running "System Checks" with "Stereo 2.0" configuration so that "System Calibration" isn't also completed.
Then, the device B works normally as below if running "Mono 1.0 PBTL / *Stereo 2.0 PBTL" configuration.
So, I believe that the device A has been damaged in the OUTB+/- outputs since it was shipped.
Have you ever had this kind of experience ?

* yellow : OUT2A+/-, bule : OUT2B+/-, orange : "OUT2A+/- -OUT2B+/-"

Best regards,
Kato

Hi Roy-san,

I have an additional information.
This pop noise issue also occurs even if setting "Stereo 2.0" configuration without the load impedance.

Best regards,
Kato

Hi Roy-san,

Thank you for your continuous support.

This pop noise issue occurs even if running "Mono 1.1" configuration, so I also believe that TAS5782MEVM has some problems in either Device A or the board.
In addition, it seems that there isn't any issue for Device B.
Unfortunately, I don't have another EVM, so cannot try it.
Then, I will get the cooperation to your local FAE and try to obtain new EVM.

I greatly appreciate your cooperation.

Best regards,
Kato

Hi Roy-san,

OK, I will get back to you when trying to test with another one.

Best regards,
Kato