TPA2054D4A: Can the Class-D amplifiers output and headset amplifiers output of TPA2054D4A adjust the output volume separately?

Hello, 

Yes you can. 

Select the input mode you want to work with, this goes to the left or right channel outputs. Then, configure the volume registers of the selected input mode register bits. Find image below. The same applies to headphone volume control, they're independent.

For example, if the input mode is 'Stereo1' mode using Lin_1 and Rin_1 to the output channels, configure register 5. I have attached images of the 5 bit commands needed to set the gain. Headphone needs 3 bit commands.

images

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Page 22 of DS:

Depending on the input cfg picked, these registers control the volume:

Line input with volume control steps 5 bit commands:

HP max output power and 3 bit commands for different gains:

I hope this was informative.

Regards,

Ore.

Differential input mode is okay and volume control should work simultaneously on both. Make sure each output is enabled.

images

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Enabling Class-D and headphone amp independently

Regards,

Ore. 

Hey David, 

Pay attention to the specific input mode and output mode combinations available on the IC. Find on page 20. The cases apply to the line input mux to the headphone and class-d output outputs.

I hope this is informative.

Regards,

Ore