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TAS6424L-Q1: Need routing guidelines

mallesh vemula
Prodigy 10 points
Part Number: TAS6424L-Q1

Hi,

I'm using below audio amplifier in my design and I'm new to audio section.

TAS6424LQDKQRQ1

Do I need to route audio output (4 channels) with 100E differential impedance? or any other guidelines?

These lines will be connected to a connector.

thanks

mallesh v

  • 0
    TI__Mastermind 45085 points

    Hi Mallesh,

    In the datasheet you will see a Typical Application circuit.  I suggest to follow the circuit if you are new to audio.  Please acquire an Evaluation Module to learn how the device works.

    I do not know what you mean by the "100E differential impedance".  If there is no differential impedance on the typical application circuit, you do not needs it.

    Regards,
    Gregg Scott

  • 0 in reply to Gregg Scott
    Prodigy 10 points

    Hi Gregg,

    Thanks for the quick response. I'm following the typical application circuit for schematic implementation.

    And I'm talking about the differential audio outputs below. These are differential right? so, I'm saying generally in digital interfaces we route differential interfaces like PCIe with 90E/100E track impedance. For these audio outputs do we need to follow 100E differential track impedance. Also the current on these lines will be 4.5A (over current limit). That makes us to use large trace width for these output lines.

    Thanks,

    Mallesh V

  • +1 in reply to mallesh vemula
    TI__Mastermind 45085 points

    Mallesh,

    The trace length from the output pins to the inductors should be as short as possible as indicated in Section 12 of the datasheet.  The switching frequency is low, so you do not need to impedance match these traces.  This is a power amplifier, so you definitely need to increase the trace width and copper thickness to accommodate the higher currents.  After the inductor you only have audio frequencies and impedance matching is not needed at all.

    Regards,
    Gregg Scott

  • 0 in reply to Gregg Scott
    Prodigy 10 points

    Thanks Gregg

    Got the required answer