Texas Instruments PCM2704 User manual

Burr-Brown Audio
1FEATURES
APPLICATIONS
DESCRIPTION
PCM2704, ,PCM2705
PCM2706,PCM2707
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STEREOAUDIODACWITHUSBINTERFACE,
SINGLE-ENDEDHEADPHONEOUTPUTANDS/PDIFOUTPUT
–ExternalROMInterface(PCM2704/6)
2345•On-ChipUSBInterface:–SerialProgrammingInterface(PCM2705/7)
–NoNeedofDedicatedDeviceDriver–I2SInterface(SelectableonPCM2706/7)
–WithFull-SpeedTransceivers•Package:
–FullyCompliantWithUSB1.1Specification–28-PinSSOP(PCM2704/5)
–CertifiedbyUSB-IF–32-PinTQFP(PCM2706/7)
–PartiallyProgrammableDescriptors
–AdaptiveIsochronousTransferfor•USBHeadphones
Playback•USBAudioSpeaker
–Bus-PoweredorSelf-PoweredOperation•USBCRT/LCDMonitor
•SamplingRate:32,44.1,48kHz•USBAudioInterfaceBox
•On-ChipClockGeneratorWithSingle12-MHz•USB-FeaturedConsumerAudioProduct
ClockSource
•SinglePowerSupply:
–Bus-Powered:5V,Typical(VBUS)ThePCM2704/5/6/7isTI'ssingle-chipUSBstereo
–Self-Powered:3.3V,TypicalaudioDACwithUSB-compliantfull-speedprotocol
•16-BitDelta-SigmaStereoDACcontrollerandS/PDIF.TheUSB-protocolcontroller
workswithnosoftwarecode,butUSBdescriptors
–AnalogPerformanceat5V(Bus-Powered),canbemodifiedinsomeparts(forexample,vendor
3.3V(Self-Powered):ID/productID)throughtheuseofanexternalROM
–THD+N:0.006%RL>10kΩ,(PCM2704/6),SPI(PCM2705/7),oronrequest.(1)
Self-PoweredThePCM2704/5/6/7employsSpAct™architecture,
TI'suniquesystemthatrecoverstheaudioclockfrom
–THD+N:0.025%RL=32ΩUSBpacketdata.On-chipanalogPLLswithSpAct
–SNR=98dBenableplaybackwithlowclockjitter.
–DynamicRange:98dB
–PO=12mW,RL=32Ω
–OversamplingDigitalFilter
–Pass-BandRipple=±0.04dB
–Stop-BandAttenuation=–50dB
–Single-EndedVoltageOutput
–AnalogLPFIncluded
•MultipleFunctions:
–UptoEightHumanInterfaceDevice(HID)
Interfaces(DependingonModeland(1)ThemodificationoftheUSBdescriptorthroughexternalROM
Settings)orSPImustcomplywithUSB-IFguidelines,andthevendor
IDmustbeyourownIDasassignedbytheUSB-IF.The
–SuspendFlagdescriptoralsocanbemodifiedbychangingamask;contact
–S/PDIFOutWithSCMSyourrepresentativefordetails.
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas
Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2SpActisatrademarkofTexasInstruments.
3SystemTwo,AudioPrecisionaretrademarksofAudioPrecision,Inc.
4I2SisatrademarkofNXPSemiconductors.
5Allothertrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.Copyright©2003–2009,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.

ABSOLUTEMAXIMUMRATINGS
RECOMMENDEDOPERATINGCONDITIONS
PCM2704, ,PCM2705
PCM2706,PCM2707
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ThisintegratedcircuitcanbedamagedbyESD.TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwith
appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore
susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
overoperatingfree-airtemperaturerangeunlessotherwisenoted(1)
VBUS–0.3Vto6.5V
SupplyvoltageVCCP,VCCL,VCCR,VDD–0.3Vto4V
SupplyvoltagedifferencesVCCP,VCCL,VCCR,VDD±0.1V
GroundvoltagedifferencesPGND,AGNDL,AGNDR,DGND,ZGND±0.1V
HOST–0.3Vto6.5V
DigitalinputvoltageD+,D–,HID0/MS,HID1/MC,HID2/MD,XTI,XTO,DOUT,SSPND,CK,DT,
–0.3Vto(VDD+0.3)V<4V
PSEL,FSEL,TEST,TEST0,TEST1,FUNC0,FUNC1,FUNC2,FUNC3
VCOM–0.3Vto(VCCP+0.3)V<4V
AnaloginputvoltageVOUTR–0.3Vto(VCCR+0.3)V<4V
VOUTL–0.3Vto(VCCL+0.3)V<4V
Inputcurrent(anypinsexceptsupplies)±10mA
Ambienttemperatureunderbias–40°Cto125°C
Storagetemperature–55°Cto150°C
Junctiontemperature150°C
Leadtemperature(soldering)260°C,5s
Packagetemperature(IRreflow,peak)260°C
(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratings
only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommendedOperating
Conditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
overoperatingfree-airtemperaturerange
MINNOMMAXUNIT
VBUS4.3555.25
SupplyvoltageV
VCCP,VCCL,VCCR,VDD33.33.6
DigitalinputlogiclevelTTLcompatible
Digitalinputclockfrequency11.9941212.006MHz
Analogoutputloadresistance1632Ω
Analogoutputloadcapacitance100pF
Digitaloutputloadcapacitance20pF
Operatingfree-airtemperature,TA–2585C
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ELECTRICALCHARACTERISTICS
PCM2704, ,PCM2705
PCM2706,PCM2707
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allspecificationsatTA=25°C,VBUS=5V,fS=44.1kHz,fIN=1kHz,16-bitdata(unlessotherwisenoted)
PCM2704DB,PCM2705DB,
PCM2706PJT,PCM2707PJT
PARAMETERTESTCONDITIONSUNIT
MINTYPMAX
DIGITALINPUT/OUTPUT
HostinterfaceApplyUSBrevision1.1,full-speed
AudiodataformatUSBisochronousdataformat
INPUTLOGIC
VIH23.3
VIL–0.30.8
InputlogiclevelVdc
VIH(1)25.5
VIL(1)–0.30.8
IIH(2)VIN=3.3V±10
IIL(2)VIN=0V±10
InputlogiccurrentµA
IIHVIN=3.3V65100
IILVIN=0V±10
OUTPUTLOGIC
VOH(3)IOH=–2mA2.8
VOL(3)IOL=2mA0.3
OutputlogiclevelVdc
VOHIOH=–2mA2.4
VOLIOL=2mA0.4
CLOCKFREQUENCY
Inputclockfrequency,XTI11.9941212.006MHz
fsSamplingfrequency32,44.1,48kHz
DACCHARACTERISTICS
Resolution16Bits
Audiodatachannel1,2Channel
DCACCURACY
Gainmismatch,channel-to-channel±2±8%ofFSR
Gainerror±2±8%ofFSR
Bipolarzeroerror±3±6%ofFSR
DYNAMICPERFORMANCE(4)
RL>10kΩ,self-powered,0.006%0.01%
VOUT=0dB
Line(5)
TotalharmonicRL>10kΩ,bus-powered,
THD+N0.012%0.02%
distortion+noiseVOUT=0dB
RL=32Ω,self-/
Headphone0.025%
bus-powered,VOUT=0dB
THD+NTotalharmonicdistortion+noiseVOUT=–60dB2%
DynamicrangeEIAJ,A-weighted9098dB
S/NSignal-to-noiseratioEIAJ,A-weighted9098dB
Channelseparation6070dB
(1)HOST
(2)D+,D–,HOST,TEST,TEST0,TEST1,DT,PSEL,FSEL,XTI
(3)FUNC0,FUNC1,FUNC2
(4)fIN=1kHz,usingtheSystemTwo™CascadeaudiomeasurementsystembyAudioPrecision™intheRMSmodewitha20-kHzLPF
and400-HzHPF.
(5)THD+Nperformancevariesslightly,dependingontheeffectiveoutputload,includingdummyloadR7,R8inFigure32.
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PCM2704 and PCM2705
Not Recommended For New Designs

PCM2704, ,PCM2705
PCM2706,PCM2707
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ELECTRICALCHARACTERISTICS(continued)
allspecificationsatTA=25°C,VBUS=5V,fS=44.1kHz,fIN=1kHz,16-bitdata(unlessotherwisenoted)
PCM2704DB,PCM2705DB,
PCM2706PJT,PCM2707PJT
PARAMETERTESTCONDITIONSUNIT
MINTYPMAX
ANALOGOUTPUT
Outputvoltage0.55VCCL,0.55VCCRVp-p
Centervoltage0.5VCCPV
LineACcoupling10kΩ
LoadimpedanceHeadphoneACcoupling1632Ω
–3dB140kHz
LPFfrequencyresponsef=20kHz–0.1dB
DIGITALFILTERPERFORMANCE
Passband0.454fsHz
Stopband0.546fsHz
Pass-bandripple±0.04dB
Stop-bandattenuation–50dB
Delaytime20/fss
POWERSUPPLYREQUIREMENTS
VBUSBus-powered4.3555.25
VoltagerangeVdc
VCCP,VCCL,VCCR,Self-powered33.33.6
VDD
LineDACoperation2330mA
SupplycurrentHeadphoneDACoperationRL=32Ω)3546
Line/headphoneSuspendmode(6)150190µA
LineDACoperation76108mW
PowerdissipationHeadphoneDACoperationRL=32Ω)116166
(self-powered)Line/headphoneSuspendmode(6)495684µW
LineDACoperation115158mW
PowerdissipationHeadphoneDACoperationRL=32Ω)175242
(bus-powered)Line/headphoneSuspendmode(6)750998µW
Internalpower-supplyVCCP,VCCL,VCCR,Bus-powered3.23.353.5Vdc
voltage(7)VDD
TEMPERATURERANGE
Operatingtemperature–2585°C
28-pinSSOP100
(PCM2704/5)
θJAThermalresistance°C/W
32-pinTQFP80
(PCM2706/7)
(6)UnderUSBsuspendstate.
(7)VDD,VCCP,VCCL,VCCR.Thesepinsworkasoutputpinsofinternalpowersupplyforbus-poweredoperation.
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PINASSIGNMENTS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
XTO
CK
DT
PSEL
DOUT
DGND
VDD
D–
D+
VBUS
ZGND
AGNDL
VCCL
VOUTL
XTI
SSPND
TEST0
TEST1
HID2/MD
HID1/MC
HID0/MS
HOST
VCCP
PGND
VCOM
AGNDR
VCCR
VOUTR
PCM2704/PCM2705
DB PACKAGE
(TOP VIEW)
PCM2706/PCM2707
PJT PACKAGE
(TOP VIEW)
23 22 21 20 19
1 2
25
26
27
28
29
30
31
32
16
15
14
13
12
11
10
9
PSEL
DT
CK
XTO
XTI
SSPND
TEST
FSEL
ZGND
AGNDL
VCCL
VOUTL
VOUTR
VCCR
AGNDR
VCOM
24 18
3 4 5 6 7 8
17
VBUS D+ D– VDD DGND FUNC1 FUNC2 DOUT
PGND
VCCP
HOST
FUNC3 FUNC0
HID0/MS
HID1/MC HID2/MD
P0020-01
PCM2704, ,PCM2705
PCM2706,PCM2707
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PCM2704, ,PCM2705
PCM2706,PCM2707
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TerminalFunctions(PCM2704DB/PCM2705DB)
TERMINALI/ODESCRIPTION
NAMENO.
AGNDL12—AnaloggroundforheadphoneamplifierofL-channel
AGNDR17—AnaloggroundforheadphoneamplifierofR-channel
CK2OClockoutputforexternalROM(PCM2704).Mustbeleftopen(PCM2705).
D+9I/OUSBdifferentialinput/outputplus(1)
D–8I/OUSBdifferentialinput/outputminus(1)
DGND6—Digitalground
DOUT5OS/PDIFoutput
DT3I/ODatainput/outputforexternalROM(PCM2704).Mustbeleftopenwithpullupresistor(PCM2705).(1)
HID0/MS22IHIDkeystateinput(mute),activeHIGH(PCM2704).MSinput(PCM2705).(2)
HID1/MC23IHIDkeystateinput(volumeup),activeHIGH(PCM2704).MCinput(PCM2705).(2)
HID2/MD24IHIDkeystateinput(volumedown),activeHIGH(PCM2704).MDinput(PCM2705).(2)
HOST21IHostdetectionduringself-poweredoperation(connecttoVBUS).Maxpowerselectduringbus-powered
operation(LOW:100mA,HIGH:500mA).(3)
PGND19—AnaloggroundforDAC,OSC,andPLL
PSEL4IPowersourceselect(LOW:self-power,HIGH:bus-power)(1)
SSPND 27OSuspendflag,activeLOW(LOW:suspend,HIGH:operational)
TEST026ITestpin.MustbesetHIGH(1)
TEST125ITestpin.MustbesetHIGH(1)
VBUS10—ConnecttoUSBpower(VBUS)forbus-poweredoperation.ConnecttoVDDforself-poweredoperation.
VCCL13—AnalogpowersupplyforheadphoneamplifierofL-channel(4)
VCCP20—AnalogpowersupplyforDAC,OSC,andPLL(4)
VCCR16—AnalogpowersupplyforheadphoneamplifierofR-channel(4)
VCOM18—CommonvoltageforDAC(VCCP/2).ConnectdecouplingcapacitortoPGND.
VDD7—Digitalpowersupply(4)
VOUTL14ODACanalogoutputforL-channel
VOUTR15ODACanalogoutputforR-channel
XTI28ICrystaloscillatorinput(1)
XTO1OCrystaloscillatoroutput
ZGND11—Groundforinternalregulator
(1)LV-TTLlevel
(2)LV-TTLlevelwithinternalpulldown
(3)LV-TTLlevel,5-Vtolerant
(4)ConnectdecouplingcapacitortoGND.Supply3.3Vforself-poweredapplications.
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PCM2704, ,PCM2705
PCM2706,PCM2707
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TerminalFunctions(PCM2706PJT/PCM2707PJT)
TERMINALI/ODESCRIPTION
NAMENO.
AGNDL26—AnaloggroundforheadphoneamplifierofL-channel
AGNDR31—AnaloggroundforheadphoneamplifierofR-channel
CK14OClockoutputforexternalROM(PCM2706).Mustbeleftopen(PCM2707).
D+23I/OUSBdifferentialinput/outputplus(1)
D–22I/OUSBdifferentialinput/outputminus(1)
DGND20—Digitalground
DOUT17OS/PDIFoutput/I2S™dataoutput
DT15I/ODatainput/outputforexternalROM(PCM2706).Mustbeleftopenwithpullupresistor(PCM2707).(1)
FSEL9IFunctionselect(LOW:I2SDATAoutput,HIGH:S/PDIFoutput)(1)
FUNC05I/OHIDkeystateinput(nexttrack),activeHIGH(FSEL=1).I2SLRclockoutput(FSEL=0).(2)
FUNC119I/OHIDkeystateinput(previoustrack),activeHIGH(FSEL=1).I2Sbitclockoutput(FSEL=0).(2)
FUNC218I/OHIDkeystateinput(stop),activeHIGH(FSEL=1).I2Ssystemclockoutput(FSEL=0).(2)
FUNC34IHIDkeystateinput(play/pause),activeHIGH(FSEL=1).I2Sdatainput(FSEL=0).(2)
HID0/MS6IHIDkeystateinput(mute),activeHIGH(PCM2706).MSinput(PCM2707)(2)
HID1/MC7IHIDkeystateinput(volumeup),activeHIGH(PCM2706).MCinput(PCM2707)(2)
HID2/MD8IHIDkeystateinput(volumedown),activeHIGH(PCM2706).MDinput(PCM2707)(2)
HOST3IHostdetectionduringself-poweredoperation(connecttoVBUS).Maxpowerselectduringbus-powered
operation.(LOW:100mA,HIGH:500mA).(3)
PGND1—AnaloggroundforDAC,OSC,andPLL
PSEL16IPowersourceselect(LOW:self-power,HIGH:bus-power)(1)
SSPND11OSuspendflag,activeLOW(LOW:suspend,HIGH:operational)
TEST10ITestpin.MustbesetHIGH(1)
VBUS24—ConnecttoUSBpower(VBUS)forbus-poweredoperation.ConnecttoVDDforself-poweredoperation.
VCCL27—AnalogpowersupplyforheadphoneamplifierofL-channel(4)
VCCP2—AnalogpowersupplyforDAC,OSC,andPLL(4)
VCCR30—AnalogpowersupplyforheadphoneamplifierofR-channel(4)
VCOM32—CommonvoltageforDAC(VCCP/2).ConnectdecouplingcapacitortoPGND.
VDD21—Digitalpowersupply(4)
VOUTL28ODACanalogoutputforL-channel
VOUTR29ODACanalogoutputforR-channel
XTI12ICrystaloscillatorinput(1)
XTO13OCrystaloscillatoroutput
ZGND25—Groundforinternalregulator
(1)LV-TTLlevel
(2)LV-TTLlevelwithinternalpulldown
(3)LV-TTLlevel,5-Vtolerant
(4)ConnectdecouplingcapacitortoGND.Supply3.3Vforself-poweredapplications.
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EEPROM
Interface(1)
SSPND
VCCP VCCL VCCR VDD ZGNDDGNDAGNDRAGNDLPGND
VCOM
Analog
PLL
FIFO
DAC
VOUTL
S/PDIF Encoder
XTI XTO12 MHz
PLL (×8) 96 MHz Tracker
(SpAct)
USB
Protocol
Controller
Power
Manager
5-V to 3.3-V
Voltage Regulator
Control
Endpoint
ISO-Out
Endpoint
HID
Endpoint
VBUS
USB SIE
D+
D–
XCVR
DT
HOST
HID0/MS
HID1/MC
HID2/MD
CK
VOUTR
DOUT
PSEL
TEST0
TEST1
SPI
Interface(2)
B0054-01
PCM2704, ,PCM2705
PCM2706,PCM2707
SLES081F–JUNE2003–REVISEDJANUARY2009....................................................................................................................................................... www.ti.com
BLOCKDIAGRAM(PCM2704DB/PCM2705DB)
(1)AppliestoPCM2704DB
(2)AppliestoPCM2705DB
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SSPND
VCCP VCCL VCCR VDD ZGNDDGNDAGNDRAGNDLPGND
VCOM
Analog
PLL
FIFO
DAC
VOUTL
S/PDIF
Encoder
XTI XTO12 MHz
PLL (×8) 96 MHz Tracker
(SpAct)
USB
Protocol
Controller
Power
Manager
5-V to 3.3-V
Voltage Regulator
Control
Endpoint
ISO-Out
Endpoint
HID
Endpoint
VBUS
USB SIE
D+
D–
XCVR
DT
HOST
HID0/MS
HID1/MC
HID2/MD
CK
VOUTR
FUNC1
DOUT
FUNC3
I2S I/F
PSEL
TEST
EEPROM
Interface(1)
SPI
Interface(2)
FUNC2
FUNC0
FSEL
BCK
DIN
SYSCK
LRCK
DOUT
HID3: Next Track(1)
HID4: Previous Track(1)
HID5: Stop(1)
HID6: Play/Pause(1)
B0055-01
PCM2704, ,PCM2705
PCM2706,PCM2707
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BLOCKDIAGRAM(PCM2706PJT/PCM2707PJT)
(1)AppliestoPCM2706PJT
(2)AppliestoPCM2707PJT
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TYPICALPERFORMANCECURVESOFINTERNALFILTER
DACDigitalInterpolationFilterFrequencyResponse
f – Frequency [×fS]
−140
−120
−100
−80
−60
−40
−20
0
0 1 2 3 4
Amplitude – dB
G001
f – Frequency [×fS]
−0.05
−0.04
−0.03
−0.02
−0.01
0.00
0.01
0.02
0.03
0.04
0.05
0.0 0.1 0.2 0.3 0.4 0.5
Amplitude – dB
G002
DACAnalogLow-PassFilterFrequencyResponse
−2.0
−1.5
−1.0
−0.5
0.0
f – Frequency – kHz
Amplitude – dB
0.01 1 10 1000.1
G003
−80
−60
−40
−20
0
f – Frequency – kHz
Amplitude – dB
1 100 1k 10k10
G004
PCM2704, ,PCM2705
PCM2706,PCM2707
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AllspecificationsatTA=25°C,VBUS=5V,fS=44.1kHz,fIN=1kHz,16-bitdata(unlessotherwisenoted).
AMPLITUDEAMPLITUDE
vsvs
FREQUENCYFREQUENCY
Figure1.FrequencyResponseFigure2.Pass-BandRipple
AMPLITUDEAMPLITUDE
vsvs
FREQUENCYFREQUENCY
Figure3.Pass-BandCharacteristicsFigure4.Stop-BandCharacteristics
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TYPICALPERFORMANCECURVES
0.00
0.01
0.02
0.03
0.04
0.05
−50 −25 0 25 50 75 100
TA– Free-Air Temperature – °C
THD+N – Total Harmonic Distortion + Noise – %
Bus-Powered
VOUT = 0 dB
32 Ω
10 kΩ
G005
0.00
0.01
0.02
0.03
0.04
0.05
−50 −25 0 25 50 75 100
TA– Free-Air Temperature – °C
THD+N – Total Harmonic Distortion + Noise – %
Self-Powered
VOUT = 0 dB
32 Ω
10 kΩ
G006
0.00
0.01
0.02
0.03
0.04
0.05
4.0 4.5 5.0 5.5
VCC – Supply Voltage – V
THD+N – Total Harmonic Distortion + Noise – %
32 Ω
10 kΩ
Bus-Powered
VOUT = 0 dB
G007
0.00
0.01
0.02
0.03
0.04
0.05
3.0 3.1 3.2 3.3 3.4 3.5 3.6
VCC – Supply Voltage – V
THD+N – Total Harmonic Distortion + Noise – %
32 Ω
10 kΩ
Self-Powered
VOUT = 0 dB
G008
PCM2704, ,PCM2705
PCM2706,PCM2707
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AllspecificationsatTA=25°C,VBUS=5V,fS=44.1kHz,fIN=1kHz,16-bitdata(unlessotherwisenoted).
TOTALHARMONICDISTORTION+NOISETOTALHARMONICDISTORTION+NOISE
vsvs
FREE-AIRTEMPERATUREFREE-AIRTEMPERATURE
Figure5.Figure6.
TOTALHARMONICDISTORTION+NOISETOTALHARMONICDISTORTION+NOISE
vsvs
SUPPLYVOLTAGESUPPLYVOLTAGE
Figure7.Figure8.
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0.00
0.01
0.02
0.03
0.04
0.05
30 35 40 45 50
fS– Sampling Frequency – kHz
THD+N – Total Harmonic Distortion + Noise – %
32 Ω
10 kΩ
Bus-Powered
VOUT = 0 dB
G009
0.00
0.01
0.02
0.03
0.04
0.05
30 35 40 45 50
fS– Sampling Frequency – kHz
THD+N – Total Harmonic Distortion + Noise – %
32 Ω
10 kΩ
Self-Powered
VOUT = 0 dB
G010
95
97
99
101
103
105
−50 −25 0 25 50 75 100
TA– Free-Air Temperature – °C
Dynamic Range and SNR – dB
Bus-Powered
Dynamic Range
SNR
G011
95
97
99
101
103
105
−50 −25 0 25 50 75 100
TA– Free-Air Temperature – °C
Dynamic Range and SNR – dB
Self-Powered
Dynamic Range
SNR
G012
PCM2704, ,PCM2705
PCM2706,PCM2707
SLES081F–JUNE2003–REVISEDJANUARY2009....................................................................................................................................................... www.ti.com
TYPICALPERFORMANCECURVES(continued)
AllspecificationsatTA=25°C,VBUS=5V,fS=44.1kHz,fIN=1kHz,16-bitdata(unlessotherwisenoted).
TOTALHARMONICDISTORTION+NOISETOTALHARMONICDISTORTION+NOISE
vsvs
SAMPLINGFREQUENCYSAMPLINGFREQUENCY
Figure9.Figure10.
DYNAMICRANGEandSNRDYNAMICRANGEandSNR
vsvs
FREE-AIRTEMPERATUREFREE-AIRTEMPERATURE
Figure11.Figure12.
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SNR
VCC – Supply Voltage – V
Dynamic Range and SNR – dB
95
97
99
101
103
105
4.0 4.5 5.0 5.5
Dynamic Range
Bus-Powered
G013
VCC – Supply Voltage – V
Dynamic Range and SNR – dB
SNR
95
97
99
101
103
105
3.0 3.1 3.2 3.3 3.4 3.5 3.6
Dynamic Range
Self-Powered
G014
95
97
99
101
103
105
30 35 40 45 50
SNR
fS– Sampling Frequency – kHz
Dynamic Range and SNR – dB
Dynamic Range
Bus-Powered
G015
95
97
99
101
103
105
30 35 40 45 50
SNR
fS– Sampling Frequency – kHz
Dynamic Range and SNR – dB
Dynamic Range
Self-Powered
G016
PCM2704, ,PCM2705
PCM2706,PCM2707
www.ti.com .......................................................................................................................................................SLES081F–JUNE2003–REVISEDJANUARY2009
TYPICALPERFORMANCECURVES(continued)
AllspecificationsatTA=25°C,VBUS=5V,fS=44.1kHz,fIN=1kHz,16-bitdata(unlessotherwisenoted).
DYNAMICRANGEandSNRDYNAMICRANGEandSNR
vsvs
SUPPLYVOLTAGESUPPLYVOLTAGE
Figure13.Figure14.
DYNAMICRANGEandSNRDYNAMICRANGEandSNR
vsvs
SAMPLINGFREQUENCYSAMPLINGFREQUENCY
Figure15.Figure16.
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0
50
100
150
200
4.0 4.5 5.0 5.5
VBUS – Supply Voltage – V
Suspend Current – µA
G017
0
50
100
150
200
−50 −25 0 25 50 75 100
TA– Free-Air Temperature – °C
Suspend Current – µA
G018
f – Frequency – kHz
−140
−120
−100
−80
−60
−40
−20
0
0 5 10 15 20
Amplitude – dB
G019
f – Frequency – kHz
−140
−120
−100
−80
−60
−40
−20
0
0 20 40 60 80 100 120
Amplitude – dB
G020
PCM2704, ,PCM2705
PCM2706,PCM2707
SLES081F–JUNE2003–REVISEDJANUARY2009....................................................................................................................................................... www.ti.com
TYPICALPERFORMANCECURVES(continued)
AllspecificationsatTA=25°C,VBUS=5V,fS=44.1kHz,fIN=1kHz,16-bitdata(unlessotherwisenoted).
SUSPENDCURRENTSUSPENDCURRENT
vsvs
SUPPLYVOLTAGEFREE-AIRTEMPERATURE
Figure17.Figure18.
AMPLITUDEAMPLITUDE
vsvs
FREQUENCYFREQUENCY
Figure19.OutputSpectrum(–60dB,N=8192)Figure20.OutputSpectrum(–60dB,N=8192)
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DETAILEDDESCRIPTION
ClockandReset
OperationModeSelection
PowerConfigurationSelect/HostDetection
FunctionSelect(PCM2706/7)
PCM2704, ,PCM2705
PCM2706,PCM2707
www.ti.com .......................................................................................................................................................SLES081F–JUNE2003–REVISEDJANUARY2009
ForbothUSBandaudiofunctions,thePCM2704/5/6/7requiresa12-MHz(±500ppm)clock,whichcanbe
generatedbythebuilt-inoscillatorusinga12-MHzcrystalresonator.The12-MHzcrystalresonatormustbe
connectedtoXTI(pin28forPCM2704/5,pin12forPCM2706/7)andXTO(pin1forPCM2704/5,pin13for
PCM2706/7)withonelarge(1-MΩ)resistorandtwosmallcapacitors,thecapacitanceofwhichdependsonthe
specifiedloadcapacitanceofthecrystalresonator.AnexternalclockcanbesuppliedfromXTI(pin28for
PCM2704/5,pin12forPCM2706/7).Ifanexternalclockissupplied,XTO(pin1forPCM2704/5,pin13for
PCM2706/7)mustbeleftopen.Becausenoclockdisablingpinisprovided,itisnotrecommendedtousethe
externalclocksupply.SSPND(pin27forPCM2704/5,pin11forPCM2706/7)isunabletouseclockdisabling.
ThePCM2704/5/6/7hasaninternalpower-onresetcircuit,anditworksautomaticallywhenVDD(pin7for
PCM2704/5,pin21forPCM2706/7)exceeds2Vtypical(1.6V–2.4V),whichisequivalenttoVBUS(pin10for
PCM2704/5,pin24forPCM2706/7)exceeding3Vtypicalforbus-poweredapplications.Approximately700µsis
requireduntilinternalresetrelease.
ThePCM2704/5/6/7hasthefollowingmode-selectpins.
PSEL(pin4forPCM2704/5,pin16forPCM2706/7)isdedicatedtoselectingthepowersource.Thisselection
affectstheconfigurationdescriptor.Whileinbus-poweredoperation,maximumpowerconsumptionfromVBUSis
determinedbyHOST(pin21forPCM2704/5,pin3forPCM2706/7).Forself-poweredoperation,HOSTmustbe
connectedtoVBUSoftheUSBbuswithapulldownresistortodetectattachanddetach.(Toavoidexcessive
suspendcurrent,thepulldownshouldbeahigh-valueresistor.)
Table1.PowerConfigurationSelect
PSELDESCRIPTION
0Self-powered
1Bus-powered
HOSTDESCRIPTION
0DetachedfromUSB(self-powered)/100mA(bus-powered)
1AttachedtoUSB(self-powered)/500mA(bus-powered)
FSEL(pin9)determinesthefunctionofFUNC0–FUNC3(pins4,5,18,and19)andDOUT(pin17).WhentheI2S
interfaceisrequired,FSELmustbesettoLOW.Otherwise,FSELmustbesettoHIGH.
Table2.FunctionSelect
FSELDOUTFUNC0FUNC1FUNC2FUNC3
0Dataout(I2S)LRCK(I2S)BCK(I2S)SYSCK(I2S)Datain(I2S)
1S/PDIFdataNexttrack(HID)(1)Previoustrack(HID)(1)Stop(HID)(1)Play/pause(HID)(1)
(1)ValidonthePCM2706;nofunctionassignedonthePCM2707.
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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+whileVBUSoftheUSBportisinactive.
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
ProductIDmodified.)
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
Powerattributebemodified.)
0x0A,0x32or0xFA(20mAforself-powered,100mAor500mAforbus-powered,dependingon
MaxpowerPSELandHOST.Thisvaluecanbemodified.)
Thefollowinginformationiscontainedinthestringdescriptor.Somepartsofthestringdescriptorcanbemodified
throughexternalROM(PCM2704/6),SPI(PCM2705/7),orinternalmaskROMonrequest.
Table5.StringDescriptor
STRINGDESCRIPTORDESCRIPTION
#00x0409
#1Burr-BrownfromTI(defaultvalue,canbemodified)
#2USBAudioDAC(defaultvalue,canbemodified)
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DeviceConfiguration
Analog Out
Default
Endpoint
Endpoint #2
(IF #1)
Audio Streaming
Interface
Endpoint #0
Endpoint #5
(IF #2)
HID Interface
IT
TID1
FU
UID3
OT
TID2
Standard Audio Control Interface (IF #0)
PCM2704/5/6/7
M0024-01
Interface#0(Default/ControlInterface)
PCM2704, ,PCM2705
PCM2706,PCM2707
www.ti.com .......................................................................................................................................................SLES081F–JUNE2003–REVISEDJANUARY2009
Figure21illustratestheUSBaudiofunctiontopology.ThePCM2704/5/6/7hasthreeinterfaces.Eachinterfaceis
enabledbysomealternativesettings.
Figure21.USBAudioFunctionTopology
Interface#0isthecontrolinterface.Setting#0istheonlypossiblesettingforinterface#0.Setting#0describes
thestandardaudiocontrolinterface.Audiocontrolinterfaceconsistsofaterminal.ThePCM2704/5/6/7hasthree
terminals:
•Inputterminal(IT#1)forisochronous-outstream
•Outputterminal(OT#2)foraudioanalogoutput
•Featureunit(FU#3)forDACdigitalattenuator
Inputterminal#1isdefinedasaUSBstream(terminaltype0x0101).Inputterminal#1canaccepttwo-channel
audiostreamsconstructedofleftandrightchannels.Outputterminal#2isdefinedasaspeaker(terminaltype
0x0301).Featureunit#3supportsthefollowingsoundcontrolfeatures:
•Volumecontrol
•Mutecontrol
Thebuilt-indigitalvolumecontrollercanbemanipulatedbyanaudio-class-specificrequestfrom0dBto–64dB
instepsof1dB.Changesaremadebyincrementingordecrementingonestep(1dB)forevery1/fStimeinterval,
untilthevolumelevelreachestherequestedvalue.Eachchannelcanbesettoaseparatevalue.Themaster
volumecontrolisnotsupported.Arequesttothemastervolumeisstalledandignored.Thebuilt-indigitalmute
controllercanbemanipulatedbyanaudio-class-specificrequest.Amastermutecontrolrequestisacceptable.A
mutecontrolrequesttoanindividualchannelisstalledandignored.Thedigitalvolumecontroldoesnotaffect
theS/PDIFandI2Soutputs(PCM2706/7).
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Interface#1(Isochronous-OutInterface)
Interface#2(HIDInterface)
Endpoints
PCM2704, ,PCM2705
PCM2706,PCM2707
SLES081F–JUNE2003–REVISEDJANUARY2009....................................................................................................................................................... www.ti.com
Interface#1isfortheaudio-streamingdata-outinterface.Interface#1hasthefollowingthreealternativesettings.
Alternativesetting#0isthezero-bandwidthsetting.Allotheralternativesettingsareoperationalsettings.
ALTERNATIVETRANSFERSAMPLINGRATE
DATAFORMAT
SETTINGMODE(kHz)
00Zerobandwidth
0116-bitStereo2scomplement(PCM)Adaptive32,44.1,48
0216-bitMono2scomplement(PCM)Adaptive32,44.1,48
Interface#2istheinterrupt-data-ininterface.Interface#2comprisestheHIDconsumercontroldevice.
Alternativesetting#0istheonlypossiblesettingforinterface#2.
OntheHIDdevicedescriptor,eightHIDitemsarereportedasfollowsforanymodel,inanyconfiguration.
BasicHIDOperation
Interface#2canreportthefollowingthreekeystatusesforanymodel.Thesestatusescanbesetbythe
HID0–HID2pins(PCM2704/6)ortheSPIport(PCM2705/7).
•Mute(0xE2)
•Volumeup(0xE9)
•Volumedown(0xEA)
ExtendedHIDOperation(PCM2705/6/7)
ByusingtheFUNC0–FUNC3pins(PCM2706)ortheSPIport(PCM2705/7),thefollowingadditionalconditions
canbereportedtothehost.
•Play/Pause(0xCD)
•Stop(0xB7)
•Previous(0xB6)
•Next(0xB5)
AuxiliaryHIDStatusReport(PCM2705/7)
OneadditionalHIDstatuscanbereportedtothehostthoughtheSPIport.ThisstatusflagisdefinedbySPI
commandorexternalROM.Thisdefinitionmustbedescribedasonthereportdescriptorwithathree-byteusage
ID.ALA/VCapture(0x0193)isassignedasthedefaultforthisstatusflag.
ThePCM2704/5/6/7hasthreeendpoints:
•Controlendpoint(EP#0)
•Isochronous-outaudiodata-streamendpoint(EP#2)
•HIDendpoint(EP#5)
Thecontrolendpointisadefaultendpoint.Thecontrolendpointisusedtocontrolallfunctionsofthe
PCM2704/5/6/7bystandardUSBrequestandUSBaudio-class-specificrequestfromthehost.The
isochronous-outaudiodata-streamendpointisanaudiosinkendpointthatreceivesthePCMaudiodata.The
isochronous-outaudiodata-streamendpointacceptstheadaptivetransfermode.TheHIDendpointisan
interrupt-inendpoint.TheHIDendpointreportsHIDstatusevery10ms.
TheHIDendpointisdefinedasaconsumer-controldevice.TheHIDfunctionisdesignedasanindependent
endpointfromtheisochronous-outendpoint.ThismeansthattheeffectofHIDoperationdependsonhost
software.Typically,theHIDfunctionisusedtocontroltheprimaryaudio-outdevice.
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DAC
DigitalAudioInterface—S/PDIFOutput
ChannelStatusInformation
CopyrightManagement
DigitalAudioInterface—I2SInterfaceOutput(PCM2706/7)
LRCK
SYSCK
(256 f )
S
BCK
(64 f )
S
R-Channel
L-Channel
DOUT 111
111
222
222
3 3
3 3
MSB MSB MSBLSB LSB
1/fS
14 14
14 14
15 15
15 15
16 16
16 16
DIN
T0009-04
PCM2704, ,PCM2705
PCM2706,PCM2707
www.ti.com .......................................................................................................................................................SLES081F–JUNE2003–REVISEDJANUARY2009
ThePCM2704/5/6/7hasaDACthatusesanoversamplingtechniquewith128-fSsecond-ordermultibitnoise
shaping.Thistechniqueprovidesextremelylowquantizationnoiseintheaudioband,andthebuilt-inanalog
low-passfilterremovesthehigh-frequencycomponentsofthenoise-shapingsignal.DACoutputsthroughthe
headphoneamplifierVOUTLandVOUTRcanprovide12mWat32Ω,aswellas1.8VPPintoa10-kΩload.
ThePCM2704/5/6/7employsS/PDIFoutput.Isochronous-outdatafromthehostareencodedtoS/PDIFoutput
DOUT,aswellastoDACanalogoutputsVOUTLandVOUTR.InterfaceformatandtimingfollowtheIEC-60958
standard.Monauraldataareconvertedtothestereoformatatthesamedatarate.S/PDIFoutputisnot
supportedintheI2SI/Fenablemode.Theimplementationofthisfeatureisoptional.Notethatitisyour
responsibilitytodeterminwhethertoimplementthisfeatureinyourproductornot.
Thechannelstatusinformationisfixedasconsumerapplication,PCMmode,copyright,anddigital/digital
converter.Allotherbitsarefixedas0s,exceptforthesamplefrequency,whichissetautomaticallyaccordingto
thedatareceivedthroughtheUSB.
DigitalaudiodataoutputalwaysisencodedasoriginalwithSCMScontrol.Onlyonegenerationofdigital
duplicationisallowed.
ThePCM2706andPCM2707cansupporttheI2Sinterface,whichisenabledbyFSEL(pin9).IntheI2Sinterface
enabledmode,pins4,18,19,5,and17areassignedasDIN,SYSCK,BCK,LRCK,andDOUT,respectively.
Theyprovidedigitaloutput/inputdatainthe16-bitI2Sformat,whichalsoisacceptedbytheinternalDAC.I2S
interfaceformatandtimingareshowninFigure22,Figure23,andFigure24.
Figure22.AudioDataInterfaceFormat
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t(BCH)
DOUT (Output)
t(BCL) t(BL)
t(BCY)
50% of VDD
50% of VDD
50% of VDD
LRCK (Output)
BCK (Output)
DIN (Input)
t(DH)
t(DS)
50% of VDD
t(BD) t(LD)
T0010-05
SYSCK
(Output)
LRCK
(Output)
BCK
(Output)
t(SLL)
t(SBH) t(SBL)
t(SLH)
T0196-01
PCM2704, ,PCM2705
PCM2706,PCM2707
SLES081F–JUNE2003–REVISEDJANUARY2009....................................................................................................................................................... www.ti.com
SYMBOLPARAMETERMINMAXUNIT
t(BCY)BCKpulsecycletime300ns
t(BCH)BCKpulseduration,HIGH100ns
t(BCL)BCKpulseduration,LOW100ns
t(BL)LRCKdelaytimefromBCKfallingedge–2040ns
t(BD)DOUTdelaytimefromBCKfallingedge–2040ns
t(LD)DOUTdelaytimefromLRCKedge–2040ns
t(DS)DINsetuptime20ns
t(DH)DINholdtime20ns
NOTE:LoadcapacitanceofLRCK,BCK,andDOUTis20pF.
Figure23.AudioInterfaceTiming
SYMBOLPARAMETERMINMAXUNIT
t(SLL),t(SLH)LRCKdelaytimefromSYSCKrisingedge–510ns
t(SBL),t(SBH)BCKdelaytimefromSYSCKrisingedge–510ns
NOTE:Loadcapacitanceis20pF.
Figure24.AudioClockTiming
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