TAS2110EVM: Audible Noise

Hi, Tadahiko-san,

Our team will take a look at this and will provide an answer as soon as possible.

Best regards,

Luis Fernando Rodríguez S.

Hi Kuramochi-san,

Let me add some questions and comments on some tests we can try to identify the root cause:

• What is the difference between right and left from the scope capture? Is this the moment the device is unmuted?
• I assume this is during silence (no input data) correct?
• Can you please also share scope captures of PVDD and VBAT voltages?
• Have you tried to use a different audio source? Like an AP

Please let me know about the questions above and if you have any further details or questions.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

Hi Kuramochi-san,

Do you have any update on my comments above?
Thanks.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

Ivan-san,

I have some additional information.

1. The following is the noise waveform and noiseless waveform.

2. Noise appears when only the I2S signal as below.

Why does the noise appear when only I2S signal?

Best Regards,

Kuramochi

Hi Kuramochi-san,

By cable length and EMI filter, I assume you mean at the output of the amplifier, correct?

Is your GND coupling correctly from I2S source to the EVM? What is your I2S signal source? Is the noise present if using different I2S sources?

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

Ivan-san,

Thank you for your support.

This symptom was caused by EMI interference to I2S signal.

Best Regards,

Kuramochi