Choosing an Audio D/A converter for I2S digital audio based on 32fs
PCM1748 should be satisfied with the 32fs output of your VS1063A when the output sample rate is set to 48kHz.

According to the documentation, you can generate a 12.288MHz MCLK output, from which a division by 8 will get you an SCLK output of 1.536MHz when 48kHz is selected, and the LROUT output will toggle with the sample rate of 48kHz, whereas SDATA will output the actual data.



You wire MCLK into the SCK input of the PCM1748, SCLK output into BCK, LROUT into LRCK, and SDATA into DATA intput. Figure 21 in the data sheet of PCM1748 suggests that right-justified is the correct format setting for BCK = 32fs. Your misunderstanding might come from the fact that the pins are named a little bit differently by the two vendors.

The difference between PCM1748 &amp; PCM510xA is that the latter can live without getting the 12.288MHz master clock - it can generate it for itself using its internal PLL.