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PCM4104: Help selecting a mono D amplifier for PCM4104 output

Efrain Avina
Prodigy 50 points
Part Number: PCM4104
Other Parts Discussed in Thread: TPA2005D1

Tool/software:

Hello, I'm a beginner on audio projects and I have many doubts:

I want to amplify 3 outputs of the PCM4104 (working at 24bit and 192kHz) because the sound isn't that loud.

PCM4104 is driving 3 mono channels: 2 of them connected to headphones and the other one to a bone transducer. The three of them have 10Ohm of impedance and I want to be able to deliver 1W maximum.

The schematic is basically a copy:




of the one recommended on PCM4104's datasheet: Figure 21. Single-Ended Output Filter Circuit:


The only differences are the Opamp IC and the rail voltages.


Would the TPA2005D1 amplifier be enough for this purpose (one amplifier for channel)?

also, I don't understand how to correctly connect:

the output of the PCM4104 to the input of the TPA2005D1
the output of TPA2005D1 and the input of the jack


Thanks for your support!


  • 0
    TI__Mastermind 38335 points

    Hi,

    Our team has received your question. Responses may be a little slow due to the holiday in the U.S.

    Thanks for your patience,
    Jeff McPherson

  • 0
    TI__Guru** 103725 points

    Hi Efrain,

    The connection from PCM4104 to TPA2005D1 is pretty straightforward as they're both differential, you just need to add a low-pass filter between these components:

    Class-D amplifiers, like TPA2005D1, are differential output amplifiers. Differential output is not commonly used for headphones as these are usually single ended.

    A few questions to better understand your application:

    • Are you planning to drive 1W into headphones and bone transducer? or you're only trying to increase the power on the bone transducer?
    • Is bone transducer single ended or differential?
    • Is bone transducer connected through a cable, similar to headphones?

    Best regards,
    -Ivan Salazar
    Applications Engineer