Hello Bob! Real nice one with 4 ADAUs standing in a row) lifts up spirits for sure)))
Could you please further clarify with master clock sync between the ICs? I'm thinking of a design with just two ADAU1701s (1401A in fact) with the main purpose of separate processing of 2 stereo channels but also I'm thinking over the possibility to send I2S or TDM (depends on which is easier to implement) from one ADAU to another in a situation where 4 analog outs suffice but a processing chain I want needs more processing power than one chip can give.
So my question is what do you think about the solution of getting MCLK for the second ADAU from the BCLK output of the first one (MP11 pin), as it is suggested in the datasheet (p. 18, "using the oscillator")?
The second method is to use a clock from the serial output port. Pin 19 (MP11) can be set as an output (master) clock divided down from the internal core clock. If this pin is set to serial output port (OUTPUT_BCLK) mode in the multipurpose pin configuration register (Address 2081) and the port is set to master in the serial output control register (Address 2078), the desired output frequency can also be set in the serial output control register with the OBF[1:0] bits (see Table 49).
If it is a workable solution what would be the best way to implement it?
If still the external "3.3V packaged oscillator" as in your project is a better way to do the job, could you please explain why, and show some link to the device in question?
Anyone who can comment on this, please welcome)