How to enable stereo headphone output on the nRF5340 Audio DK

[naka]

Hello,
I have a question about the headphone jack output on the nRF5340 Audio DK.

In past DevZone threads, it has been stated that “the headphone output through the CS47L63 is mono (left channel only).” I would like to clarify the following points:

1. For the latest revision of the nRF5340 Audio DK currently available, is the headphone jack still limited to mono output only?

2. Is it possible to use other analog outputs or the digital I²S/TDM outputs of the CS47L63 to build a stereo output path through external circuitry?

3. If possible, could you provide recommended hardware connection examples and firmware configuration examples (Zephyr-based) for stereo output?

My end goal is to read mono PCM data from an SD card, duplicate it to both left and right channels, adjust the volume balance between them, and play it back in stereo through headphones.

Thank you in advance.

[Turbo J]

Looked at the codec chip itself? It only has a mono amplifier output.

In order to properly connect stereo headphones you need a different codec chip. It may be possible to connect another codec onto the AUX I²S interface.

Firmware for that will be your task though.

[dejans]

Hi,

As shown in the key features, nRF5340 audio DK has mono output and stereo line input. It is possible to connect external hardware codec. You can get more information about needed application changes in this ticket. For receiving stereo signal and hardware connections you can refer to this ticket.

Best regards,
Dejan