I2S MCK not more than 10 MHz.

[Rajat Kumar]

We need to generate MCK of more than 10 MHz to achieve I2S connection between Nordic NRF5340 and MAX9867.

However looking at the data sheet there in no configuration which will generate 10MHz or more, for LRCK 48000.

How can we achieve the same with NRF53 ? please suggest.  

[haakonsh]

The Product Specification for the nRF5340 is not yet complete, therefore I don't know what the maximum MCK frequency can be, but I think there's a good chance of it supporting an MCK frequency of 12288000Hz as that is the Audio PLL clock source frequency. 

The Master clock (MCK) chapter explains how you set an arbitrary MCK frequency. 

[Rajat Kumar]

We are presently using nrf5340 pdk board for evaluation, can you tell how can we achieve I2S MCK more than 10 MHz, as we are not able to find it in the table for available I2S MCKs for 48000 KHz LRCK, Max we can see there for this case is 3.07 MHz.

[haakonsh]

The table is an example, 

haakonsh said:

The Master clock (MCK) chapter explains how you set an arbitrary MCK frequency. 

See Figure 3. MCK clock frequency equation.