From AD1934's datasheet, I understand that I can run this device without the PLL. My case is the following :
- AD1934 is master on the I2S link (the device outputs both the bit clock and the L/R clock)
- Stereo data, bit clock at 64xFs, 16-b data, I2S mode
- Input clock : 12.288MHz
- Frame rate : 192000kHz
Here is how the AD1934 is programmed :
PLL and Clock Control 0 : 0x99
PLL and Clock Control 1 : 0x03
DAC Control 0 : 0x04
DAC Control 1 : 0x30
DAC Control 2 : 0x18
The result is that the Frame rate is 96kHz instead of 192k...The bit clock runs at 6.144MHz.
PS : A block diagram showing the entire clock tree would help a lot in complement of the description text.