Texas Instruments PCM1795 TV Cables User Manual


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1.1FunctionalBlockDiagram
CN003
Serial
Connector
I/V
5534a
I/V
5534a
I/V
5534a
I/V
5534a
BALAmp
5534a
BALAmp
5534a
LchOUT
(4.5V )
RMS
RchOUT
(4.5V )
RMS
DAI
CS8414
SW001 003
ModeControl
-
S/PDIFIN
OPT
Coax
DSDS1796
PCM1795
PCM1796
PCM1798
DEM-AS/CDACDaughterCard
3.3-V
Regulator
+VCC
(5V)
±
±
AVCC
( 15V)
1.2EVMFeatures
FunctionalBlockDiagram
www.ti.com
Figure1-1illustratesthefunctionalblockdiagramoftheDEM-DSD1796/PCM1795/PCM1796/PCM1798
EVM.
Figure1-1.DEM-DSD1796/PCM1795/PCM1796/PCM1798BlockDiagram
TheDEM-DSD1796/PCM1795/PCM1796/PCM1798seriesofstereoDACsconsistofaDAI(S/PDIF)
sectionthatusesaDSD1796/PCM1795/PCM1796/PCM1798DACsection,adifferentialcurrent/voltage
(I/V)section,andabalancedamplifierwithapost-low-passfilter(LPF)section.
TheDEM-DSD1796/PCM1795/PCM1796/PCM1798requiresa5-Vdigitalpowersupplyforitsdigital
circuits,a5-Vanalogpowersupplyforthedeviceitself,anda±15-Vanalogpowersupplyforthe
balancedamplifiercircuits.
TheDAIsectionhasbothcoaxialandopticalinputsthatareswitch-selectableandcapableofhandling
samplingratesupto96kHz.
TheDSD1796/PCM1795/PCM1796/PCM1798acceptsPCMaudiodatainputatasamplingrateupto192
kHz,ora64-f
S
DSDsignalinput,asdeterminedbyfunctionalcontrolsettingsandjumperconnectionson
theboard.
ThisevaluationfixtureusestheDEM-DSD1796/PCM1795/PCM1796/PCM1798demonstrationboardand
demonstrationsoftwareforfunctionalevaluationandoperationalcontrolofthe
DSD1796/PCM1795/PCM1796/PCM1798DACdevice.
Description8SLEU057A–September2004–RevisedMay2009
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