DAC0830/DAC08328-BitμPCompatible,Double-BufferedDtoAConvertersMay1999
DAC0830/DAC0832
8-BitμPCompatible,Double-BufferedDtoAConverters
GeneralDescription
TheDAC0830isanadvancedCMOS/Si-Cr8-bitmultiplyingDACdesignedtointerfacedirectlywiththe8080,8048,8085,Z80?,andotherpopularmicroprocessors.Adepositedsilicon-chromiumR-2Rresistorladdernetworkdividesthereferencecurrentandprovidesthecircuitwithexcellenttem-peraturetrackingcharacteristics(0.05%ofFullScaleRangemaximumlinearityerrorovertemperature).ThecircuitusesCMOScurrentswitchesandcontrollogictoachievelowpowerconsumptionandlowoutputleakagecurrenterrors.SpecialcircuitryprovidesTTLlogicinputvoltagelevelcom-patibility.
DoublebufferingallowstheseDACstooutputavoltagecor-respondingtoonedigitalwordwhileholdingthenextdigitalword.ThispermitsthesimultaneousupdatingofanynumberofDACs.
TheDAC0830seriesarethe8-bitmembersofafamilyofmicroprocessor-compatibleDACs(MICRO-DAC?).
Features
nDouble-buffered,single-bufferedorflow-throughdigitaldatainputs
nEasyinterchangeandpin-compatiblewith12-bitDAC1230series
nDirectinterfacetoallpopularmicroprocessorsnLinearityspecifiedwithzeroandfullscaleadjustonly—NOTBESTSTRAIGHTLINEFIT.
nWorkswith±10Vreference-full4-quadrantmultiplicationnCanbeusedinthevoltageswitchingmode
nLogicinputswhichmeetTTLvoltagelevelspecs(1.4Vlogicthreshold)
nOperates“STANDALONE”(withoutμP)ifdesired
nAvailablein20-pinsmall-outlineormoldedchipcarrierpackage
KeySpecifications
nnnnnn
Currentsettlingtime:1μsResolution:8bits
Linearity:8,9,or10bits(guaranteedovertemp.)GainTempco:0.0002%FS/?CLowpowerdissipation:20mWSinglepowersupply:5to15VDCTypicalApplication
DS005608-1
BI-FET?andMICRO-DAC?aretrademarksofNationalSemiconductorCorporation.Z80?isaregisteredtrademarkofZilogCorporation.
?1999NationalSemiconductorCorporationDS005608www.national.com
ConnectionDiagrams
(TopViews)
MoldedChipCarrierPackage
Dual-In-LineandSmall-OutlinePackages
DS005608-22
DS005608-21
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AbsoluteMaximumRatings(Notes1,2)
IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.SupplyVoltage(VCC)
VoltageatAnyDigitalInputVoltageatVREFInput
StorageTemperatureRangePackageDissipationatTA=25?C(Note3)DCVoltageAppliedtoIOUT1orIOUT2(Note4)ESDSusceptability(Note4)
17VDCVCCtoGND
±25V
?65?Cto+150?C
500mW
?100mVtoVCC800V
LeadTemperature(Soldering,10sec.)Dual-In-LinePackage(plastic)Dual-In-LinePackage(ceramic)SurfaceMountPackageVaporPhase(60sec.)Infrared(15sec.)
260?C300?C215?C220?C
OperatingConditions
TemperatureRange
Partnumberswith“LCN”suffixPartnumberswith“LCWM”suffixPartnumberswith“LCV”suffixPartnumberswith“LCJ”suffixPartnumberswith“LJ”suffixVoltageatAnyDigitalInput
TMIN≤TA≤TMAX0?Cto+70?C0?Cto+70?C0?Cto+70?C?40?Cto+85?C?55?Cto+125?C
VCCtoGND
ElectricalCharacteristics
VREF=10.000VDCunlessotherwisenoted.Boldfacelimitsapplyovertemperature,TMIN≤TA≤TMAX.ForallotherlimitsTA=25?C.
VCC=4.75VDCVCC=15.75VDCTyp(Note12)
TestedLimit(Note5)
8
VCC=5VDC±5%VCC=12VDC±5%to15VDC±5%
DesignLimit(Note6)
8
ParameterConditions
SeeNoteLimitUnits
CONVERTERCHARACTERISTICSResolutionLinearityErrorMaxDAC0830LJ&LCJDAC0832LJ&LCJDAC0830LCN,LCWM&LCV
DAC0831LCN
DAC0832LCN,LCWM&LCV
DifferentialNonlinearityMax
DAC0830LJ&LCJDAC0832LJ&LCJDAC0830LCN,LCWM&LCV
DAC0831LCN
DAC0832LCN,LCWM&LCVMonotonicityGainErrorMaxGainErrorTempcoMaxPowerSupplyRejection
?10V≤VREF≤+10VUsingInternalRfb?10V≤VREF≤+10VUsinginternalRfb
AlldigitalinputslatchedhighVCC=14.5Vto15.5V
11.5Vto12.5V4.5Vto5.5V
ReferenceInput
MaxMin
VREF=20Vp-p,f=100kHzAlldatainputslatchedlow
0.00020.00060.01315153
0.0152010
2010
k?k?mVp-p
0.0025
%FSR/V
0.0002
0.0006
%FS/?C
LJ&LCJ
LCN,LCWM&LCV
74
Zeroandfullscaleadjusted?10V≤VREF≤+10V
0.10.40.10.20.488
0.10.40.10.20.488
%FSR%FSR%FSR%FSR%FSRbitsbits%FS
4,8
Zeroandfullscaleadjusted?10V≤VREF≤+10V
0.050.20.050.10.2
0.050.20.050.10.2
%FSR%FSR%FSR%FSR%FSR
4,8
8
bits
±0.2±1±1
OutputFeedthroughError
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ElectricalCharacteristics
(Continued)
VREF=10.000VDCunlessotherwisenoted.Boldfacelimitsapplyovertemperature,TMIN≤TA≤TMAX.ForallotherlimitsTA=25?C.
VCC=4.75VDCVCC=15.75VDCTyp(Note12)
TestedLimit(Note5)1005010050
4511513030
LJ:LJ:LCJ:LCJ:
Min
DigitalInputCurrents
Max
LogicHigh
4.75V15.75V4.75V15.75V
0.60.80.70.80.952.01.9
?50
?200?160
0.11.2
+10+83.51.7
0.82.02.0?200?200+10+103.52.0
mAμAμAμAVDCVDCpF
VCC=5VDC±5%VCC=12VDC±5%to15VDC±5%
DesignLimit(Note6)100100100100
pFnA
ParameterConditions
SeeNoteLimitUnits
CONVERTERCHARACTERISTICSOutputLeakageCurrentMax
IOUT1IOUT2
OutputCapacitance
IOUT1IOUT2IOUT1IOUT2
DigitalInputVoltages
Max
AlldatainputslatchedlowAlldatainputslatchedhighAlldatainputslatchedlowAlldatainputslatchedhighLogicLow
LJ&LCJ
LCN,LCWM&LCVLJ&LCJ
LCN,LCWM&LCV
10
nA
DIGITALANDDCCHARACTERISTICS
LCN,LCWM,LCVLJ&LCJ
LCN,LCWM,LCV
Digitalinputs<0.8V
LJ&LCJ
LCN,LCWM,LCV
Digitalinputs>2.0V
LJ&LCJ
LCN,LCWM,LCV
SupplyCurrentDrain
Max
LJ&LCJ
LCN,LCWM,LCV
ElectricalCharacteristics
VREF=10.000VDCunlessotherwisenoted.Boldfacelimitsapplyovertemperature,TMIN≤TA≤TMAX.ForallotherlimitsTA=25?C.
VCC=15.75VDC
Symbol
Parameter
Conditions
SeeNote
Typ(Note12)
TestedLimit(Note5)
VCC=12VDC±5%to15VDC±5TsignLimit(Note6)
VCC=4.75VDCTyp(Note12)
TestedLimit(Note5)
VCC=5VDC±5TsignLimit(Note6)
LimitUnits
ACCHARACTERISTICStstWtDStDHtCStCH
CurrentSettingTime
WriteandXFERPulseWidthMinDataSetupTimeMin
DataHoldTimeMin
ControlSetupTimeMin
ControlHoldTimeMin
VIL=0V,VIH=5V
9
0
VIL=0V,VIH=5V
9
110
VIL=0V,VIH=5V
9
VIL=0V,VIH=5VVIL=0V,VIH=5V
1199
100100
250320250320303025032000
32010
0600
320320
375375
6009006009005050900110000
1100900
ns
900
VIL=0V,VIH=5V
1.0
1.0
μs
Note1:AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.DCandACelectricalspecificationsdonotapplywhenoperatingthedevicebeyonditsspecifiedoperatingconditions.
Note2:AllvoltagesaremeasuredwithrespecttoGND,unlessotherwisespecified.
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ElectricalCharacteristics
(Continued)
Note3:ThemaximumpowerdissipationmustbederatedatelevatedtemperaturesandisdictatedbyTJMAX,θJA,andtheambienttemperature,TA.ThemaximumallowablepowerdissipationatanytemperatureisPD=(TJMAX?TA)/θJAorthenumbergivenintheAbsoluteMaximumRatings,whicheverislower.Forthisdevice,TJMAX=125?C(plastic)or150?C(ceramic),andthetypicaljunction-to-ambientthermalresistanceoftheJpackagewhenboardmountedis80?C/W.FortheNpack-age,thisnumberincreasesto100?C/WandfortheVpackagethisnumberis120?C/W.
Note4:Forcurrentswitchingapplications,bothIOUT1andIOUT2mustgotogroundorthe“VirtualGround”ofanoperationalamplifier.ThelinearityerrorisdegradedbyapproximatelyVOS÷VREF.Forexample,ifVREF=10Vthena1mVoffset,VOS,onIOUT1orIOUT2willintroduceanadditional0.01%linearityerror.Note5:TestedlimitsareguaranteedtoNational’sAOQL(AverageOutgoingQualityLevel).
Note6:Guaranteed,butnot100%productiontested.Theselimitsarenotusedtocalculateoutgoingqualitylevels.
Note7:GuaranteedatVREF=±10VDCandVREF=±1VDC.
Note8:Theunit“FSR”standsfor“FullScaleRange.”“LinearityError”and“PowerSupplyRejection”specsarebasedonthisunittoeliminatedependenceonapar-ticularVREFvalueandtoindicatethetrueperformanceofthepart.The“LinearityError”specificationoftheDAC0830is“0.05%ofFSR(MAX)”.Thisguaranteesthatafterperformingazeroandfullscaleadjustment(seeSections2.5and2.6),theplotofthe256analogvoltageoutputswilleachbewithin0.05%xVREFofastraightlinewhichpassesthroughzeroandfullscale.
Note9:BoldfacetestedlimitsapplytotheLJandLCJsuffixpartsonly.
Note10:A100nAleakagecurrentwithRfb=20kandVREF=10Vcorrespondstoazeroerrorof(100x10?9x20x103)x100/10whichis0.02%ofFS.Note11:TheentirewritepulsemustoccurwithinthevaliddataintervalforthespecifiedtW,tDS,tDH,andtStoapply.Note12:Typicalsareat25?Candrepresentmostlikelyparametricnorm.Note13:Humanbodymodel,100pFdischargedthrougha1.5k?resistor.
SwitchingWaveform
DS005608-2
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dac0832资料 - 图文
