Datasheet

USBInterface
PCM2704, ,PCM2705
PCM2706,PCM2707
SLES081F–JUNE2003–REVISEDJANUARY2009....................................................................................................................................................... www.ti.com
ControldataandaudiodataaretransferredtothePCM2704/5/6/7viaD+(pin9forPCM2704/5,pin23for
PCM2706/7)andD–(pin8forPCM2704/5,pin22forPCM2706/7).D+shouldbepulledupwitha1.5-kΩ(±5%)
resistor.Toavoidbackvoltageinself-poweredoperation,thedevicemustnotprovidepowertothepullup
resistoronD+whileV
BUS
oftheUSBportisinactive.
Alldatato/fromthePCM2704/5/6/7aretransferredatfullspeed.Thefollowinginformationisprovidedinthe
devicedescriptor.SomepartsofthedevicedescriptorcanbemodifiedthroughexternalROM(PCM2704/6),SPI
(PCM2705/7),orinternalmaskROMonrequest.
Table3.DeviceDescriptor
DEVICEDESCRIPTORDESCRIPTION
USBrevision1.1compliant
Deviceclass0x00(devicedefinedinterfacelevel)
Devicesubclass0x00(notspecified)
Deviceprotocol0x00(notspecified)
Maxpacketsizeforendpoint08bytes
VendorID0x08BB(defaultvalue,canbemodified)
0x2704/0x2705/0x2706/0x2707(Thesevaluescorrespondtothemodelnumber,andthevaluecanbe
ProductID
modified.)
Devicereleasenumber1.0(0x0100)
Numberofconfigurations1
VendorstringsBurr-BrownfromTI(defaultvalue,canbemodified)
ProductstringsUSBAudioDAC(defaultvalue,canbemodified)
SerialnumberNotsupported
Thefollowinginformationiscontainedintheconfigurationdescriptor.Somepartsoftheconfigurationdescriptor
canbemodifiedthroughexternalROM(PCM2704/6),SPI(PCM2705/7),orinternalmaskROMonrequest.
Table4.ConfigurationDescriptor
CONFIGURATIONDESCRIPTORDESCRIPTION
InterfaceThreeinterfaces
0x80or0xC0(bus-poweredorself-powered,dependingonPSEL;noremotewakeup.Thisvaluecan
Powerattribute
bemodified.)
0x0A,0x32or0xFA(20mAforself-powered,100mAor500mAforbus-powered,dependingon
Maxpower
PSELandHOST.Thisvaluecanbemodified.)
Thefollowinginformationiscontainedinthestringdescriptor.Somepartsofthestringdescriptorcanbemodified
throughexternalROM(PCM2704/6),SPI(PCM2705/7),orinternalmaskROMonrequest.
Table5.StringDescriptor
STRINGDESCRIPTORDESCRIPTION
#00x0409
#1Burr-BrownfromTI(defaultvalue,canbemodified)
#2USBAudioDAC(defaultvalue,canbemodified)
16SubmitDocumentationFeedbackCopyright©2003–2009,TexasInstrumentsIncorporated
ProductFolderLink(s):PCM2704PCM2705PCM2706PCM2707
PCM2704 and PCM2705
Not Recommended For New Designs