Block Diagram
1-2
1.1
Block Diagram
Figure 1–1. DEM-PCM2900/2902 Block Diagram
PCM2900
PCM2902
S/PDIF IN
S/PDIF OUT
USB
Connector
USB Interface
SW001 – SW003
Operation Control
3.3 V
REG
12M XTAL
CN002
CN001
Analog Out
Lch
Rch
SSPND
VOUTL/R
VINL/R
DIN
DOUT
D+/–
VBUS
OPA2353
LPF
OPA2353
LPF
CN101
Analog In
Lch
Rch
CN102
1.2
Connection Setting
-
CN001
: USB port (series B connector), connects to a USB cable/
connector
-
CN101
: Audio LINE OUT (stereo minijack, 1.98 V
PP
full scale)
-
CN102
: Audio LINE IN (stereo minijack, 1.98 V
PP
full scale)
-
CN002
: S/PDIF IN/OUT for DEM-PCM2902
GND GND
OUT
IN
1.3
Switch Settings
-
SW001: HID key state (mute)
-
SW002: HID key state (volume up)
-
SW003: HID key state (volume down)
These switches should be set to LOW logic level for software control, or
toggled HIGH for manual control of their respective parameters.