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