STMicroelectronics Pop-free 120 mW stereo headphone amplifier DEMOTS488S DEMOTS488S データシート

Doc ID 11971 Rev 5

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Generally headphones are connected using jack connectors. To prevent a pop in the 
headphones when plugging in the jack, a pulldown resistor should be connected in parallel 
with each headphone output. This allows the capacitors C

out

 to be charged even when the 

headphones are not plugged in. 

Pulldown resistors with a value of 1 k

Ω are high enough to be a negligible load, and low 

enough to charge the capacitors C

out

 in less than one second.