LM4980资料

LM4980

2CellBattery,1mA,42mWPerChannelHighFidelity

StereoHeadphoneAudioAmplifierforMP3players

GeneralDescription

TheLM4980isastereoheadphoneaudioamplifier,which

whenconnectedtoa3.0Vsupply,delivers42mWtoa16Ω

loadwithlessthan1%THD+N.WiththeLM4980packaged

intheSDpackage,thecustomerbenefitsincludelowprofile

andsmallsize.ThispackageminimizesPCBareaandmaxi-

mizesoutputpower.

TheLM4980featurescircuitrythatsignificantlyreducesout-

puttransients(“clicks”and“pops”)whiledrivingheadphones

duringdeviceturn-onandturn-offwithoutcostlyexternal

additionalcircuitry.TheLM4980alsoincludesanexternally

controlledlow-powerconsumptionactive-lowshutdown

mode,andthermalshutdown.Boomeraudiopoweramplifi-

ersaredesignedspecificallytousefewexternalcompo-

nentsandprovidehighqualityoutputpowerinasurface

mountpackage.KeySpecifications

jOutputpower

(RL=16Ω,VDD=3.0V,THD+N=1%)42mW(typ)

jQuiescentcurrent(VDD=3V)1mA(typ)

jMicropowershutdowncurrent0.1µA(typ)

jSupplyvoltageoperatingrange1.5V

jPSRR@1kHz,VDD=3.0V90dB(typ)

jPSRR@217Hz,VDD=3.0V100dB(typ)

Features

n2-cell1.5Vto3.3Vbatteryoperation

nUnity-gainstable

n“Clickandpop”suppressioncircuitryforshutdownand

poweron/offtransientwithheadphoneloads

nActivelowmicro-powershutdown

nThermalshutdownprotectioncircuitry

Applications

nPortabletwo-cellaudioproducts

nPortabletwo-cellelectronicdevices

nPortableMP3player/recorders

TypicalApplication

Boomer®isaregisteredtrademarkofNationalSemiconductorCorporation.20142901

FIGURE1.BlockDiagramJuly2005LM4980

2

Cell

Battery,

1mA,

42mW

Per

Channel

High

Fidelity

Stereo

Headphone

Audio

Amplifierfor

MP3

players

©2005NationalSemiconductorCorporationDS201429www.national.com元器件交易网www.cecb2b.comConnectionDiagram

SDPackage

20142902TopView

OrderNumberLM4980SD

SeeNSPackageNumberSDA10ALM4980

www.national.com2元器件交易网www.cecb2b.comTypicalConnection

20142903

FIGURE2.TypicalApplicationCircuitLM4980

www.national.com3元器件交易网www.cecb2b.comAbsoluteMaximumRatings(Note1)

IfMilitary/Aerospacespecifieddevicesarerequired,

pleasecontacttheNationalSemiconductorSalesOffice/

Distributorsforavailabilityandspecifications.

SupplyVoltage3.6V

StorageTemperature−65˚Cto+150˚C

InputVoltage−0.3VtoVDD+0.3V

PowerDissipation(Note2)Internallylimited

ESDSusceptibility(Note3)2000V

ESDSusceptibility(Note4)200V

JunctionTemperature150˚C

SolderInformation

SmallOutlinePackageVaporPhase(60sec)215˚CInfrared(15sec)220˚C

SeeAN-450“SurfaceMountingandtheirEffectson

ProductReliablilty”forothermethodsofsoldering

surfacemountdevices.

ThermalResistance

θJA(typ)SDA10A73˚C/W

OperatingRatings

TemperatureRange

TMIN≤TA≤TMAX−40˚C≤TA≤+85˚C

SupplyVoltage1.5V≤VDD≤3.3V

ElectricalCharacteristicsVDD=3.0V(Notes1,5)

ThefollowingspecificationsapplyforthecircuitshowninFigure2,unlessotherwisespecified.AV=0dB,RL=32Ω.

LimitsapplyforTA=25˚C.

SymbolParameterConditionsLM4980Units

(Limits)TypicalLimit

(Note6)(Note7)

IDDQuiescentPowerSupplyCurrentVIN=0V,IO=0A,RL=∞(Note8)1.01.5mA(max)

ISDShutdownCurrentVSHDN=GND0.11µA(max)

VOSOutputOffsetVoltage15mV

POOutputPower(Note9)RL=16Ω,

THD+N=1%,f=1kHz,perchannel4235mW(min)

RL=32Ω,

THD+N=1%,f=1kHz,perchannel28mW(min)

VNOOutputVoltageNoise20Hzto20kHz,A-weighted,Fig.210µVRMSTHD+NTotalHarmonicDistortion+NoiseRL=32Ω,POUT=10mW,f=1kHz0.02%

CrosstalkFreq=1kHz,POUT=28mW,RL=32Ω77dB

PSRRPowerSupplyRejectionRatioVRIPPLE=200mVP-Psinewave

fRIPPLE=1kHz,CMIDCAP=4.7µF,

VMIDVoltageisRipple-Free90dB

VRIPPLE=200mVP-Psinewave

fRIPPLE=217Hz,CMIDCAP=4.7µF,

VMIDVoltageisRipple-Free100dB

CMRRCommon-ModeRejectionRatioInputcouplingcapacitorswith5%

tolerance,VIN=VMID,

fRIPPLE=1kHz47dB

TWAKE-UPWake-upTimeCMIDCAP=4.7µF,Fig2.250ms

VIHControlLogicHigh1.5V≤VDD≤3.3V1.4VV(min)

VILControlLogicLow1.5V≤VDD≤3.3V0.4VV(max)

ElectricalCharacteristicsVDD=1.8V(Notes1,5)

ThefollowingspecificationsapplyforthecircuitshowninFigure2,unlessotherwisespecified.AV=0dB,RL=32Ω.

LimitsapplyforTA=25˚C.

SymbolParameterConditionsLM4980Units

(Limits)TypicalLimit

(Note6)(Note7)

IDDQuiescentPowerSupplyCurrentVIN=0V,IO=0A,RL=∞(Note8)0.9mA

ISDShutdownCurrentVSHDN=GND0.1µA

VOSOutputOffsetVoltage1mVLM4980

www.national.com4元器件交易网www.cecb2b.comElectricalCharacteristicsVDD=1.8V(Notes1,5)(Continued)

ThefollowingspecificationsapplyforthecircuitshowninFigure2,unlessotherwisespecified.AV=0dB,RL=32Ω.

LimitsapplyforTA=25˚C.

SymbolParameterConditionsLM4980Units

(Limits)TypicalLimit

(Note6)(Note7)

POOutputPower(Note9)RL=16Ω,

THD+N=1%,f=1kHz,perchannel11mW(min)

RL=32Ω,

THD+N=1%,f=1kHz,perchannel9mW(min)

VNOOutputVoltageNoise20Hzto20kHz,A-weighted,Fig.29µVRMSTHD+NTotalHarmonicDistortion+NoiseRL=32Ω,POUT=10mW,f=1kHz0.03%

CrosstalkFreq=1kHz,POUT=9mW,RL=32Ω79dB

PSRRPowerSupplyRejectionRatioVRIPPLE=200mVP-Psinewave

fRIPPLE=1kHz,CMIDCAP=4.7µF,

VMIDVoltageisRipple-Free78dB

VRIPPLE=200mVP-Psinewave

fRIPPLE=217Hz,CMIDCAP=4.7µF,

VMIDVoltageisRipple-Free85dB