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TPA3221: Comparison of Analog In vs Digital In Class D for system > 50W?

AnBer
Mastermind 29565 points
Part Number: TPA3221

Team,

Do we have an high level comparison that compares analog In (like TPA322x) vs digital in Class D Amplifier?
I am more interested in topics related to cost (device and total BOM), board area, PCB constrains side (heat dissipation, .etc), design tradoffs.

I looked already at the below video that gives great details about TPA3221:
https://training.ti.com/webinar-above50W-audio-amps

Thanks in advance,

Anthony

  • 0
    TI__Guru 63420 points

    AnBer,

    This largely depends on the application and what is already available in the system design. 

    For example, if there is already a system MCU that has an I2S input, it doesn't make sense to pick an analog in part and have to add a DAC IC.

    Likewise if the system is for professional audio such as a guitar, analog in makes more sense.

    Can you explain the application or system?

    On a basic level, TPA3221 has adjustable input gain so input op-amps are not needed. This means the BOM between analog and digital in from the amp standpoint is the same. The front end doesn't contribute to the thermals of the board so that wouldn't change the heat dissipation or similar. 

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    TI__Mastermind 29565 points

    Hi Adam,

    Thanks of the inputs.

    In this particular system the Audio quality is not such a high concern. Assuming that the MCU card can output both analog and Digital (I2S) what would be the key differences for using Class with analog or digital IN (in term of cost (device and total BOM), board area, PCB constrains side (heat dissipation, .etc), design tradoffs) for a 300 to 400W system?

    Thanks in advance,

    Anthony

  • 0 in reply to AnBer
    TI__Guru 63420 points
    Anthony,

    If your system already has Analog input or Digital input for the device then the use/BOM cost/size/thermal design will be very similar if not the same.

    At the moment we have more analog input devices in that power range but any of our devices can use a PCM device to make them digital input.

    If you have specific device questions, please create a thread for them.

    Regards,

    -Adam