Datasheet

HID
BUS/SELF power control
GND +5 V
3.3-V reg
CN3
CN4
U4
SW1–SW3
TM2 TM1
JP1–JP11
U5
CN1
EXT ROM
CN2
SPI(PCM2705)
U3
B0295-01
USBbus
interface
S/PDIF
output
TOTX141P
12-MHz
XTAL
PCM2704
PCM2705
Stereo
minijack
headphone
output
Description www.ti.com
1.2 Block Diagram
Figure 1. PCM270xEVM-U Block Diagram
1.3 Basic Operating Connections
1.3.1 Universal Serial Bus (USB)
A USB interface is connected to USB connector CN4.
1.3.2 Stereo Headphone Output
A stereo headphone plug is connected to stereo minijack audio output connector CN2.
1.3.3 Bus-Power/Self-Power Selection
Operation in the bus-powered or self-powered mode is user selectable, chosen by jumper plug settings on
the board. The default setting is self-powered operation.
Bus-Powered
JP1, (JP7): Shorting plug of jumper JP1 must be connected. (JP7 can be removed if the
application draws less than 100 mA.)
JP2–JP6, JP8: Shorting plugs of jumpers JP2–JP6, JP8 must be removed.
JP9, JP10, JP11: Shorting plugs of jumpers JP9, JP10, and JP11 must be connected on the BUS
side.
CN3 or TM1, TM2 external power supply:
External 5-V power supply must not be connected.
2
PCM270xEVM-U SLEU114– May 2011
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