Texas Instruments DEM-PCM2912 EVM, User Manual, Page: 13 / 43

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1.3 Functional Block Diagram
S
S
XTI XTO
6.000 MHz
96 MHz
PLL (x16)
Tracker
(SpAct )
â
USB protocol
controller
ISO-out
endpoint
Control
endpoint
ISO-in
endpoint
FIFO
FIFO
XCVR
Selector
Selector
Analog
PLL
Analog
PLL
USB SIE
V
REF
5 V to 3.3 V
Voltage
Regulator
Power
Manager
ADC
DAC
MIC
Bias
MIC
Amp
BGND V /V /V /V /V
CCA CCP CCL CCR DD
AGND/HGND/PGND/DGND
SSPND
V
BUS
D+
D -
POWER
MAMP
MMUTE
PLAY
REC
TEST0
TEST1
MBIAS
V
IN
V
COM2
V
COM1
V L
OUT
V R
OUT
FL
FR
PGA +30 dB to
12 dB
in 1-dB steps
-
ATT 0 dB to 76 dB
in 1-dB steps with Mute
-
ATT 0 dB to 76 dB
in 1-dB steps with Mute
-
HP AMP 15 mW (at 32 ) W
Functional Block Diagram
Figure 1-2 illustrates the functional block diagram of the DEM-PCM2912 EVM.
Figure 1-2. DEM-PCM2912 EVM Functional Block Diagram
SBAU132 – March 2008 Description 13
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