TPA2038D1: cutoff frequency and pop noise

Part Number: TPA2038D1

Hi all

Would you mind if we ask TPA2038D1?

Input coupling capacitor(AC coupling) on TPA2038D1YFFEVM is 0.1uF.

In case of AV = 6 dB   : the cutoff frequency will be 21.2Hz
In case of AV = 12 dB : the cutoff frequency will be 10.6Hz

In generally, we guess that the big capacitance value will be cause of pop-noise.
So, in case of using 0.1uF, as your experience, is it no level which you worry pop-noise?

If you have some advice, please let us.

Kind regards,

Hirotaka Matsumoto

  • Hi Matsumoto-san,

    The cutoff frequency shouldn't change with the gain. is it happening to you?
    As you mentioned, if the capacitor discharge time is very long (bigger capacitors), that could cause Pop noise.
    On the other hand, Pop noise is caused by an unbalanced input in order to avoid it, you can use differential input instead of single-ended input.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer