About I2S settings for nRF5340

[okasa]

Hi There,

We are currently developing a prototype using the mRF5340.
(MDBT53-1M )
The key is to operate I2S at 192kHz.

Please let me confirm the following:

Is LRCK's maximum limit 96kHz?
It is described in the I2S timing specification.
docs.nordicsemi.com/.../i2s.html

Best regards
- satoshi

[Turbo J]

Yes, the I²S peripherial is limited to 96kHz according to its electrical specifications in the datasheet.

You would also get problems with 8MHz f_SCK limit - 2*24 bits at 192kHz require more than 8MBit/sec of data.

Note that there should be zero audible difference between running codec at 96kHz and running at 192kHz for the human ear (assuming properly configured codec chip).

[okasa]

Hi There,

Due to the SCLK limit of 8MHz, the LRCK limit is 125kHz.
In that case, LRCK may have an upper limit of 96kHz.

I'd like to test this out with a prototype.
Thanks for the advice!!

Best regards
- satoshi