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TPA2006D1: click and pop reduction questions

Dan Andersen
Genius 11430 points
Part Number: TPA2006D1

Hello,

My customer is using the TPA2006D1 in a system hooked up differentially to the HP output of our AIC3204 (using the left and right HP outputs to drive the input BTL).  The '3204 is always on and the '2006 is toggled on/off via the enable pin.  They are noticing objectionable levels of click/pop on enable - and have tired both DC coupled as well as AC coupled (4.7nF input caps)configurations with little difference.  Input resistors are set to 150k.  There is currently no output filter in place.  The supply is decoupled with a 1uF cap close to the Vdd pin. 

What additional steps can we take to help mitigate the turn-on click/pop?  I have suggested altering the input caps to a larger value to move the input high pass filter fc below the audible range (testing 1uF).  Are there better values?  Any other suggestions?

Thanks,

Dan 

  • 0
    TI__Mastermind 20085 points
    Hi Dan,

    Your suggestion is right. To change the input caps would help to reduce pop noise.
    In the other hand, you should take into account that the capacitors must have a tolerance of ±10% or better and any capacitor in the audio path should have a rating of X7R or better. Besides the resistors should have a tolerance of 1% or better.

    Best Regards
    Jose Luis Figueroa
    Audio Applications Engineer