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TLV320AIC3101: pop sound appears

Part Number: TLV320AIC3101
Other Parts Discussed in Thread: TLV320AIC31

1. When TLV320AIC31 is used, pop sound will appear when the power amplifier is turned on and off. Please  see the appendix for waveform and sch

2. Is the pop tone related to the power on and power off sequence of the power amplifier?

3. Is there a good way to improve pop sound?

codec.pdf

  • Is the pop tone related to the power on and power off sequence of the power amplifier?

    Yes, the proper power on and power off sequence could reject the pop sound.The TLV320AIC31 requires a hardware reset after power-up for proper operation. After all power supplies are at their specified values, the RESET pin must be driven low for at least 10 ns. If this reset sequence is not performed, the TLV320AIC31 may not respond properly to register reads/writes.

    In addition, AIC31 datasheet describes how to do to avoid the pop or clicks sound, please do it according to the three steps.