Datasheet

TypicalCircuitConnection3(ExampleofDSPSurroundProcessingAmp)
V
BUS
(3)
D+
GND
USB ’B’
Connector
D–
C
7
R
1
SUSPEND
R
8
R
9
Headphone
31 30 29 28 27
FSEL
TEST
SSPND
XTI
XTO
CK
DT
PSEL
(2)
V
COM
AGNDR
V
CCR
V
OUT
R
(1
)
V
OUT
L
(1)
V
CCL
AGNDL
ZGND
32 26
PGND
V
CCP
HOST
(2)
FUNC3
FUNC0
HID0/MS
(4)
HID1/MC
HID2/MD
PCM2707PJT
25
23
22
21
20
19
24
18
17
10 11 12 13 1491 51 6
2
3
4
5
6
1
7
8
V
BUS
D+
D–
V
DD
DGND
FUNC1
FUNC2
DOUT
C
5
+
C
6
C
3
C
4
X
1
C
1
C
2
R
5
+
C
8
+
C
9
R
10
R
11
C
10
R
6
C
11
R
7
R
3
R
4
R
12
R
2
(3)
DOUT
SYSTEMCLOCK
BCK
MD
MC
MS
LRCK
DIN
T AS300X
(4)
I
2
S I/FAudioDevice
Power
3.3V
GND
+
(3)
+
PCM2704, ,PCM2705
PCM2706,PCM2707
SLES081F–JUNE2003–REVISEDJANUARY2009....................................................................................................................................................... www.ti.com
Figure34illustratesatypicalcircuitconnectionforanI
2
S-andSPI-enabledself-poweredapplication.
NOTE:X
1
:12-MHzcrystalresonator.C
1
,C
2
:10-pFto33-pFcapacitors(dependingonloadcapacitanceofcrystalresonator).C
3
,C
4
:1-µF
ceramiccapacitors.C
5
,C
7
:0.1-µFceramiccapacitorand10-µFelectrolyticcapacitor.C
6
:10-µFelectrolyticcapacitors.C
8
,C
9
:100-µF
electrolyticcapacitors(dependingonrequiredfrequencyresponse).C
10
,C
11
:0.022-µFceramiccapacitors.R
1
,R
12
:1MΩresistors.R
2
,R
5
:
1.5kΩresistors.R
3
,R
4
:22Ωresistors.R
6
,R
7
:16Ωresistors.R
8
-R
11
:3.3kΩresistors.
(1)OutputimpedanceofV
OUT
LandV
OUT
Rduringsuspendmodeorlackofpowersupplyis26kΩ±20%,whichisthedischargepathforC
8
andC
9
.
(2)DescriptorprogrammingthroughSPIisonlyavailablewhenPSELandHOSTarehigh.
(3)D+pull-upmustnotbeactivated(HIGH:3.3V)whilethedeviceisdetachedfromUSBorpowersupplyisnotappliedonV
DD
andV
CC
x.
VBUSofUSB(5V)canbeusedtodetectUSBpowerstatus.
(4)MSmustbehighuntilthePCM2707powersupplyisreadyandtheSPIhost(DSP)isreadytosenddata.Also,theSPIhostmusthandle
theD+pull-upifthedescriptorisprogrammedthroughtheSPI.D+pull-upmustnotbeactivated(HIGH=3.3V)beforeprogrammingofthe
PCM2707throughtheSPIiscomplete.
Figure34.Self-PoweredApplication
NOTE:
ThecircuitillustratedinFigure34isforinformationonly.Theentireboarddesign
shouldbeconsideredtomeettheUSBspecificationasaUSB-compliantproduct.
30SubmitDocumentationFeedbackCopyright©2003–2009,TexasInstrumentsIncorporated
ProductFolderLink(s):PCM2704PCM2705PCM2706PCM2707
PCM2704 and PCM2705
Not Recommended For New Designs