I built an own circuit with this ADAU1701 DSP and with an stm32f103 microcontroller.
In the datasheet of the DSP (page 15.) is a description about the sequence of the initialization.
1. Apply power to ADAU1701
2. Wait for PLL to lock
3. Load Sigma DSP program and parameters
4. Set up registers
5. Turn off the default muting, clear data registers and initialize DAC setup register
How do I know PLL is locked?