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OPA1662: Audio amplifer :Differential output layout guidelines

Anand
Intellectual 540 points
Part Number: OPA1662

Hi,

I'm using OPA1662AIDR for audio amplifier where design requirement is to output differential audio signals with 9V p-p at 600ohm line impedance.

I would like to know any recommended layout-routing guidelines to be followed for this differential audio design.

  • 0
    TI__Expert 6250 points

    Hello Anand,

    In terms of layout and routing, there shouldn't be anything unusual - following general layout best practices should be sufficient. It's recommended to keep both signal paths as symmetrical as possible, use a ground plane, and try and keep traces as short as possible.

    If this circuit will be driving an external cable load (through an XLR connector, for instance), I'd recommend adding output resistors to the OPA1662's output to isolate cable capacitance. If you are capacitively coupling the output, we recommend adding a bleeder resistor to ground at the output jack. Adding TVS diodes for ESD protection is a good idea as well. 

    We also recommend tying the shield of your output connection to chassis ground (pin 1 of an XLR connector or the sleeve of a TRS connector).