TAS2563: How to increase the output level

Hello Makino, 

I recommend using the input gain at the top of the tuning and audio processing page of PPC3 to increase the volume. You can also make sure that the "Volume Control" setting in the Device control is set to 0dB (max). 

I recommend leaving the AMP_LEVEL as default for now as you should be able to obtain loud volumes without changing it. 

Best Regards, 

Justin Beigel

Hi Justin Beigel-san

Thank you for reply.

The "Volume Control" setting is already 0dB (max).
The DRC tuning of PPC3 makes the volume louder but the sound quality worse. So I'm looking for another way to increase the volume.

I tried changing AMP_LEVEL [4:0] from 16dBV to 22dBV, and the result was satisfactory.
Are there any concerns about setting it to 22dBV? (ex, Speaker protection / Waveform clipping / Background noise / Current consumption)
I would like to know the conditions under which 22 dBV can be set.

Thanks
Makino

Hello Makino-san, 

When I say the "input gain", I don't go into the DRC page of the tuning. See the image below: 

Something to note when using the AMP_LEVEL combines analog and digital gain above 16dB. If that is acceptable to you, then I don't see any issues with setting it to 22dBV. 

Best Regards, 

Justin Beigel

Hi Justin Beigel-san

Thank you for reply.

>Something to note when using the AMP_LEVEL combines analog and digital gain above 16dB. If that is acceptable to you, then I don't see any issues with setting it to 22dBV.
I would like to know the specific acceptable conditions. What are the negative consequences of improper Analog Gain settings?
We want to increase the volume with Analog Gain whenever possible.

In addition, we are considering Gain settings at PPC3 as shown in the xlsx file below.
Will clipping occur if a full-scale signal is input? Or does the anti-clipping feature work?
Do I need to adjust the total Gain settings to less than 0dB to prevent clipping?

Thanks

Makino

TAS2563_gain-tuning.xlsx

Hello Makino-san, 

If you are using ROM mode, then there is no issue using the full 22dBV. The speaker protection algorithm in the smart amp mode uses the assumption that the analog gain provides a full scale signal. 

If you are using ROM mode, I would suggest checking the output signal on the gain settings you use to make sure you are not clipping. 

Best Regards, 

Justin Beigel

Hi Justin Beigel-san

Thank you for reply.

We use tuning mode for music playback.
Does clipping occur in the attached Excel Gain distribution in tuning mode?
Or does the anti-clipping function work, so the sound quality does not deteriorate so much?
I would like to know if there is a problem with the Gain distribution of the attached Excel.

Also, under what conditions can AMP_LEVEL [4: 0] be raised when using the tuning mod?

Thanks
Makino2806.TAS2563_gain-tuning.xlsx

HI Makino-san,

AMP_LEVEL should not be modified in tuning mode. The processing tools like speaker protection, anti-clipping, etc, are operating under the assumption AMP_LEVEL is default 16dBV.

AMP_LEVEL can only be changed in ROM mode.

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

Hi Ivan Salazar-san

Thank you for reply.

OK, we use 16dBV.

By the way, is SmartAMP's Protection Tuning automatically determined by Characterization?
Is it better not to change the parameters in the figure below?

Also, please tell us the effect of the DEQ Advanced parameters shown in the figure below.

Thanks
Makino

Hello Makino-san, 

The Protection Tuning can be altered as desired. For general recommendations, please see the TAS2563 Tuning Guide app note. This app note also has some information on the DEQ parameters. 

Best Regards, 

Justin Beigel

Hi Justin Beigel-san

Thank you for reply.

I checked the attached "TAS2563 Tuning Guide.pdf" about the above, but I didn't understand.
Please tell me the detail.

1, Is SmartAMP's Protection Tuning automatically determined by Characterization?

2, Are there any concerns that changing the Protection Tuning could damage the speakers?

3, Please tell me the meaning of the following parameters of DEQ.
   -Gain CutOff Frequency
   -Peak Smooth Time Constant

ThanksTAS2563 Tuning Guide.pdf
Makino

Hello Makino-san, 

1. No. The values for the Protection Tuning are not automatically determined by characterization. 
2. There are no concerns in changing these values. Our general recommendation is to set all thermal priorities to 1. 
3. I am still waiting to hear back on clarification for these two parameters and will update you as soon as I can. 

Best Regards, 

Justin Beigel