PCM63 Piggy Back forums

Do NOT connect the following pins when installing the PCM63 as a Piggy Back:
Pins: 1, 3, 4, 9, 10, 23, 24, 25

Connect only the following signal paths between the Upper DAC and the Lower  DAC:
a) digital inputs
  b) signal outputs
    c)  power supplies

The Data Sheet of PCM63
PCM63 Pin Assignment

The Piggy Back killer
PCM63 Adaptor Application Note
Exploring the world of DAC chips