Texas Instruments DEM-DAI3010 - Manual (Page 15)

Setting Functions
1-9 Description
CN057: V
CC
supply selection for the PCM3010
This jumper determines whether V
CC
for the PCM3010 is supplied from a 3.3-V
regulator on this board (U051), or via an external power supply terminal (CN056).
In the initial setting, V
CC
is supplied from the onboard regulator. When V
CC
for the
PCM3010 is to be provided by an external power supply, the jumper is removed
from CN057 and 3.3 V is supplied to CN056. If 3.3 V is supplied externally, 5 V
must still be provided to CN054 in order to supply the analog section of the
PCM3010.
To avoid latch-up of the PCM3010, ensure that V
CC
and V
DD
are switched on
simultaneously at start-up.