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PCM2903: Echo Problem and Unused Pin Vinr and Vout Right

Part Number: PCM2903


I'm using this device to connect a headset + microphone but I'm having an echo problem. I set windows to voice recording and when I'm playing music and recording voice at the same time, the music is echoing to the mic input is getting recorded as well. Is this echo feedback internal to the chip?

I am also not using Pin13 and pin 14 of the device. Is it ok to keep the Right input and output channel or do you have a recommended way to terminate them?