PCM1864: PCM1864 SCH review

Hello,

Some Comments:

1.It looks the 2 stereo input channels are created for this application.   However unused analog pins have capacitors(c233,c234,c249,c250) tied to gnd. The datasheet says to leave unused analog pins unconnected.  we can  remove these capacitors.

 2. The device has a Slave mode where an external BCK is given to the device and this can be read by the PLL to  generate a master clock. in the chip. In the Schematic  R64 from BCK to SCK input. can be deleted.  The PLL already has the BCK input. In this mode the crystal can be removed. . 

Alternatively the Master mode can be used when the crystal is in place

3. Decoupling capacitors of Avdd  C40,C41 should be connected to Analog GND.

 4.I2C translator Transistors M7 and M6 should have pullups to 1.8v  on source of M7 and M6.

5. An anti aliasing filter on the analog inputs.

Best Regards

Sanjay