determineddvdes-644

DSC-644TheDSC-644isalow-profileDigital-to-Synchro(D/S)andDigital-to-Resolver(D/R)converter.
Itisonly0.
52incheshigh.
TheDSC-644hasastandardpinconfigurationandhasaruggeddesign.
Thepoweroutputstagehasoverloadandtransientpro-tection,andathermalcut-offtopre-ventoverheating.
Theoutputhasshort-circuitprotectionandanalu-minumtopplatetoimprovethermaldissipation.
TheDSC-644alsohasacircuitdesignthatprovidesamoreaccurateoutputwithanimprovedtransientresponseandanegligiblescalefactorvariation.
Reliabilityhasalsobeenincreased.
TheDSC-644modulecontainsaninputreferenceisolationtransformer.
Aninternaloutputtransformerisalsoincludedforall400Hzversions.
The60Hzoptionrequiresaseparateout-puttransformer.
APPLICATIONSTheDSC-644canbeusedwhendigi-tizedshaftangledatamustbeconvert-edtosynchroorresolverformtodrivecontroltransformerscontroldifferentialtransmittersandangleindicators.
BecausetheseconvertersareveryruggedandmeettherequirementsofMIL-STD-202E,theyaresuitableforthemostsevereindustrialandmilitaryapplications,includingmilitarygroundsupportandavionics.
Theyareidealforcomputer-basedsystemswheredigitalinformationisprocessed,suchassim-ulators,flighttrainersflightinstrumenta-tion,andfirecontrolsystems.
DESCRIPTION14-BITD/SANDD/RCONVERTERLOW-PROFILEINDUSTRYSTANDARDFEATURES1.
5VADriveCapabilityProtectedOutput:RuggedCurrent-LimitedOutputShort-CircuitProtectionOvervoltageTransientProtectionThermalCutoffMetalHeatsinkatTopofCase:ConservativeThermalDesignVeryLowScaleFactorVariation:0.
05%TypicalOutput:Internal400HzIsolationTransformerAllCommonSynchro/ResolverVoltageLevelsandFrequenciesDigitalInput:CMOSandTTLCompatibleParallelBinaryAngleInputREFINPUTRHRLREFERENCEISOLATIONTRANS-FORMERDIGITALANGLEINPUTBIT1BIT14DIGITAL-TO-RESOLVERCONVERTER(HIGHACCURACY:LOWSCALEFACTORVARIATION)OUTPUTPOWERAMPLIFIERSSIN(S)COS(C)OUTPUTTRANSFORMER*SYNCHROORRESOLVEROUTPUT*OUTPUTTRANSFORMERISINTERNALFOR400Hz.
ASEPERATETRANSFORMERISNEEDEDFOR60Hz.
FIGURE1.
DSC-644BLOCKDIAGRAM*Patented1999DataDeviceCorporation21MSB234567891011121314LSB180904522.
511.
255.
6252.
8131.
4060.
70310.
35160.
17580.
08790.
04390.
0220BITDEG/BITMIN/BIT10,8005,4002,7001,350675337.
5168.
7584.
3842.
1921.
0910.
555.
272.
641.
32TABLE2.
BITWEIGHTTABLEINTRODUCTIONTheDSC-644(seeFIGURE1)containsaninternaldigital-to-resolver(D/R)converterwhichhasaninherentlyhighaccuracyandlowscalefactorvariation.
ThecircuitintheinternalD/Rcon-verterisbasedonanalgorithmwhosetheoreticalmatherrorisisonly±3.
5arc-seconds(lessthan5%of1LSB),andwhosethe-oreticalscalefactorvariationwithangleislessthan±0.
015%.
Theoutputiswellbehaved,withnegligibleglitchesatmajortran-sitionpoints.
Theaccuracyandscalefactorerrorarenowlimit-edbythephysicalcomponents,notbythealgorithm.
ThedigitalimputsaretransientprotectedCMOSswitcheswith33kpullupresistorstothe+5Vsupply,andcanbedrivenbyallstandardTTLgates.
IftheTTLgatesdriveotherloadsaswell,thecircuitmustallowthe33kresistorstopullupthelogicleveltowithin1.
0Vofthe+5Vsupply.
Bitweightsforthe14binaryinputsaregiveninthebitweighttable.
Angleisdeterminedbyaddingbitsinthelogic1state.
Theinternalreferenceinputtransformerprovidesisolationatboth60Hzand400Hz,soachangeoffrequencywillnotcausedamage.
Theinputisspecifiedforoperationatareferencelevelofeither115Vor26Vrms.
Theoutputsignalsareproportionaltotheappliedreference,andanydistortioninthereferenceinputwillappearintheoutputsignals.
Athermalcutoutdisablestheoutputpoweramplifierswhentheinternaltemperaturereaches125°C.
Theoutputisautomaticallyrestoredwhenthetemperaturedropsagain.
TheDSC-644willnotbedamagedbyanysequencingorderorinterruptionsineitherthedcsuppliesorthereferenceinput.
However,ifoneofthedcsuppliesisshutdownorsubsequentlypoweredup,maximumturnoncurrent(450mA)willbedrawnfromtheother15Vsupplyuntilthemissing15Vsupplyisrestored.
The60Hzsynchrounitrequiresbothaconvertermodule(DSC-644-6)andaseparatetansformerbecauseofthetransformersize.
Theoutputpoweramplifiersonthe-6moduleprovidea7Vrmsnominal±2%resolversignalfortheexternaltransformerwhenthereferenceinputis115Vrms.
TABLE1.
DSC-644SPECIFICATIONSAppliesoveroperatingtemperaturesandfrequencyranges,±5%variationofpowersupplies.
±10%referenceamplitudevariation,upto10%refer-enceharmonicdistortion,andforanybalancedloaduptofullload.
PARAMETERVALUERESOLUTION14bitsACCURACY(TOFULLLOAD)OutputAccuracyDifferentialLinearity±4minutes±1LSBmaxDIGITALINPUTLogicTypeLoadingNaturalbinaryangle.
parallelpositivelogicTTLcompatibleTransientprotectedCMOS33kpull-upto+5V0.
13StdTTLloadsREFERENCEINPUT(TRANSFORMER-ISOLATED)Unitswith90VrmsL-LoutputUnitswith11.
8VrmsL-LoutputReferenceMax.
Ref.
VoltageLevel*Current115Vrms0.
6mA26Vrms0.
6mA*+20%absolutemax.
toavoiddamage.
ANALOGOUTPUT(TRANSFORMER-ISOLATED)DriveCapability(L-LBalanced*)SynchroOutput90VrmsL-L,360-440Hz(OptionH)90VrmsL-L,57-440Hz(Option6)11.
8VrmsL-L,360-440Hz(OptionL)ResolverOutput11.
8rmsL-L,360-440Hz(OptionL)OutputScaleFactorAbsolute(AllCauses)VariationWithDigitalAngleOutputQuadrature*Theoutputamplifierswilldriveloadswithanyphaseanglefrom-90°to+90°4kmin4kmin70min93min±2%maxsimultaneousamplitudevariationonalloutputlines,includ-ingvariationwithdigitalangle.
Outputamplitudetracksreferenceinputamplitude.
±0.
1%max±0.
3%maxPOWERSUPPLYVoltageMaxVoltageWithoutDamageAverageCurrentPeakCurrentwithNormalLoadPeakCurrentatPowerTurn-onorShortCircuit+15V-15V+5V+18V-18V+7V150mAmax150mAmax5mAmax330mAmax330mAmax5mAmax600mAmax600mAmax5mAmaxTEMPERATURERANGESOperating(TemperatureOfMetalPlateOnTopOfCase-1Option-3OptionStorage-55°Cto+85°C0°Cto+70°C-55°Cto+125°CPHYSICALCHARACTERISTICSConverterModule(encapsulated)SizeWeight60HzTransformerModule(encapsulated)SizeWeight3.
125x2.
625x0.
52inch(7.
94x6.
67x1.
32cm)5.
1ozmax(145g)2.
25x2.
25x0.
81inch(5.
7x5.
7x2.
1cm)10.
5ozmax(298g)33090150210270330360θ(DEGREES)CCWInPhasewithRH-RLofConverter0S1-S3=VSINθMAXS3-S2=VSIN(θ+120°)MAXS2-S1=VSIN(θ+240°)MAX-VMAX+VMAXFIGURE2A.
SYNCHROOUTPUTSIGNALSS32/3Zso2/3Zso2/3ZsoS1S2Z=R+jXsoLFIGURE3.
ZSOMEASUREMENT26V08CT4c26V11CT4d11CT4e15CT4c15CT6b18CT4c18CT6b23CT4a23CT6a081111151518182323MILITARYPARTNUMBERZSOSIZE100+j49021+j132838+j49551600+j93001170+j67801420+j132601680+j50401460+j110501250+j3980TABLE3.
TYPICALCONTROLTRANSFORMERSANDTHEIRLOADIMPEDANCESMinimumloadimpedancesarelistedintheSpecificationsTableunderDriveCapabilty.
TheDSC-644candrivetheseimped-ancesundertheworstcaseconditionsstatedinthetable.
Theminimumloadimpedancescorrespondtoa1.
5VAdrivecapabil-itywhenthelinevoltagesandfrequenciesareattheirnominalvalues.
Themetaltopoftheconvertermoduleshouldbeprovid-edwithsufficientaircirculation.
DDCalsomanufacturestheDSC-544,anotherD/Sconverterwhichprovides60and400Hz90VL-Lsynchrooutput.
TheDSC-544isahighefficiency,referencepoweredconverterwithastandard0.
82inchhighprofile.
Itdoesnotrequire±15Vpowersupplies.
Whendrivingthesameload,theDSC-544dissipateshalfasmuchpowerastheDSC-644.
At400HztheDSC-544candrive4.
5VAcomparedto1.
5VAfortheDSC-644.
Bothunitscandrive1.
5VAat60Hz,buttheDSC-544doesnotrequireanexternaltransformeratthisfrequency.
OUTPUTPHASINGANDSCALEFACTORTheanalogoutputsignalshavephasingasshowninFIGURES2Aand2B.
03060120150210240300330360S2-S4=VMAXCOSθMAX+VθCCW(DEGREES)S1-S3=-VSINθMAXRESOLVEROUTPUTSIGNALS-VMAXINPHASEWITHRH-RLResolveroutputS1-S3=-(RH-RL)A0(1+A(θ))sinθS2-S4=(RH-RL)A0(1+A(θ))cosθFIGURE2B.
RESOLVEROUTPUTSIGNALSTheoutputamplitudessimultaneouslytrackreferencevoltagefluctuationsbecausetheyareproportionaltoRH-RL.
Theampli-tudefactorA0is90/115Vfor90VrmsL-Loutputand11.
8/26for11.
8VrmsL-Loutput.
ThemaximumvariationinA0fromallcausesis±1.
9%.
ThetermA(θ)representsthevariationoftheamplitudewiththedigitalinputangle.
A(θ),whichiscalledthescalefactorvariation,isasmoothfunctionofθwithoutdisconti-nuitiesandislessthan±0.
001forallvaluesofθ.
Thetotalmax-imumvariationinA0(1+A(θ))istherefore±2%.
BecauseAθissosmall,theDSC-644canbeusedtodrivesystemssuchasX-YplottersorCRTdisplaysinwhichthesinandcosoutputsareusedindependently(notratiometricallyasinacontroltrans-former).
DRIVINGCTLOADSWhendrivingCTloadstheDSC-644musthaveenoughpowerdrivecapabilitytodrivetheZsooftheload.
Zso(statorimpedancewithrotoropen-circuited)ismeasuredasshowninFIGURE3.
TABLE3showstheloadimpedanceofsometypicalcontroltransformers.
4S1S2S3CCCFIGURE4.
DELTATUNINGCONFIGURATIONTABLE4.
MIL-STD-202ETESTMETHODSMETHOD204C213B106D*107D101D105CCONDITIONCA--ABBCOMMENT10G,2000Hzvibration50G,11msshockMoistureThermalshockSaltspray50,000ft,altitude*whenconformallycoatedonP.
C.
boardMSBREFERENCELSBBIT1BIT14DSC-644SYNCHROORRESOLVERSIGNALSCTLOADS/RANGLEINDICATORAP-30711Controltransformersarehighlyinductiveloadsanditispossibletosavepowerbytuningsuchloads.
Threecapacitorsmaybeplacedacrossthelegsofthesynchrostatorinadeltaconfigura-tion:ThecorrectvalueofthecapacitanceinFaradsisgivenby:C=wherefisthecarrierfrequencyandRandXLaretheseriesrealandreactivecomponentsofZso.
HighgradecapacitorsmustbeusedandtheymustbeabletowithstandthefullACoutputvolt-age.
Whentheloadhasbeentunedmoreloadscanbedriveninpar-allel,becausetheloadimpedanceisincreasedto:Z=XL4πf(R2+XL2)R2+XL2RACCURACYTESTSTheaccuracyoftheDSC-644maybetestedwithahighaccura-cysynchro/resolverangleindicatorandaloadsuchasacontroltransformer,asshowninFIGURE5.
Thebitswitchesaresettothedesiredtestanglesandtheoutputangleismeasuredunderload.
Theaccuracyshouldconformtothespecifications.
TESTMETHODSTheDSC-644convertermodulesarehigh-qualityproducts.
ThesemodulesweredesignedtomeetthespecifictestmethodsandconditionsofMIL-STD-202E(seeTABLE4)unlessalterna-tivemethodsarespecifiedbythecustomerinhisprocurementdocumentation.
FIGURE5.
ACCURACYTESTCIRCUITPRINTEDCIRCUITBOARDMOUNTINGWhenmountingaconverteronaprintedcircuitboard,itisveryimportanttokeeplogiclevelsignalsasfarawayfromtheACandpowersignalsaspossible.
UndernocircumstancesshouldACorpowerpinsbeadjacenttodatapinsattheconnector.
ItisalsoprudenttokeeptheACandpowerpinsseparatedfromeachother.
Theintentistomakeitimpossibletoshortcircuitlogicinputs/outputstoACorpowerpinswithscopeprobes,etc.
Itisstronglyrecommendedthatcircuitlayoutsbedesignedinsuchawaythatplatedthrough-holesarenotrequiredwhenmountinghybridordiscretemodules.
Ifalllandsconnectingtopinsarelocatedontheopposite(DIP)sideofthePCboardfromthemodule,therewillbenoriskofdestroyingapinconnectionbyrippingouttheplatedthrough-holeconnectionifthemodulehastoberemoved.
Itwillalsobemucheasiertounsolderamod-ulewithoutdamagingit.
52.
3MAX2.
041256730.
71.
01.
32.
02.
3MAX.
15MAX(TYP)(Dimensionsininches,±0.
01inch,unlessotherwiseindicated.
).
040±.
0020DIA(TYP)x.
2MINPINNUMBERSNOTLABELEDONBOTTOMCRESORBRASSINSERT4-40THRU(2).
82MAX1234756PINNUMBERSMARKEDONTOPFACEONLYTOPVIEWBOTTOM(PIN)VIEWDDC25924+S-S+C-C14576S1S332S2SYNCHROOUTPUT90VL-LRESOLVERINPUT7VTRANSFORMERCONNECTIONSTransformerPinNumberConnectTo1234567S1S3S2SINGNDGNDCOSSynchroOutput90vL-L57-440HzToConverterModule3.
80±.
06.
50±.
06.
30±.
03typ.
NON-CUMULATIVE125643911712108TRANSFORMERPARTNUMBER3932TOPVIEW1.
50MAXSILVERDOTNEARPIN1.
20±.
03.
30MAX.
1.
375±.
011.
90MAX.
30MAX3.
813±.
014.
40MAXSIDEVIEW6.
32NC-2BX1/4MINBRASSINSERTS(4ONEACHSIDE).
25MAXTERMINALENVELOPEPINCALL-OUTSSHOWNFORREFERENCEONLY.
.
125SIDEVIEW.
096.
071.
187.
125DETAILOFPINS1S3S2SINGNDGNDCOSSynchroOutput90vrmsL-L47-440HzToConverterModuleDoNotUseDoNotUseRHRL+RRC-RTransformerPinNumberConnectTo123456789101112TRANSFORMERCONNECTIONS.
035*For50HzapplicationsP/NDDC-3932mustbeordered.
Dimensionsareininches.
FIGURE7.
MECHANICALOUTLINE,50HZEXTERNALSYNCHROTRANSFORMER-DDC-3932*FIGURE6.
MECHANICALOUTLINE,60HZEXTERNALSYNCHROTRANSFORMER-DDC-2592414LSB13±0.
0150.
26±0.
010.
26±0.
01±0.
01±0.
10(Min)++++++121110DSC-644-62.
6252.
600.
212.
200.
250.
2±001NonCumulative.
040Dia(±.
002)3.
125±0.
0150.
52MAXBOTTOMVIEWBOTTOMVIEWSIDEVIEW(H,L,or6)SIN9COS8765GND+15V-15V43+5V2RL1MSBRH14LSB13±0.
015±0.
01±0.
10++++121110DSC-644-HorDSC-644-LorDRC-644-L2.
6252.
600.
212.
20S3S49S28S1765GND15V-15V432RL1MSBRH+Notes:1.
Pinlabelsonbottomviewareforreferenceonly.
2.
Alldimensionsshownareininches.
3.
PinmaterialmeetssolderabilityrequirementsofMIL-STD-202E,Method208C.
FIGURE8.
DSC-644MECHANICALOUTLINE4.
CasematerialisglassfilledDiallylPhthalateperMIL-M-14,TypeSDG-F,excepttopsurfaceisablackanodizedaluminumplateforheattransfer.
5.
PinS4ispresentonresolverunitsonly.
6.
AnyLSBpinsnotusedshouldbegrounded6ORDERINGINFORMATION1.
Orderconvertermodulesasfollows:400Hzunits(HandL)haveaninternaloutputtransformer.
60Hzunitsrequireanexternaltransformerthatmustbeorderedseparatelyasshownbelow.
Ifaconvertersocketisrequired,ordersocketnumber9010.
DXC–644–X–X–XReliabilityR=EnhancedReliabilityOperatingTemperatureRangeofMetalTop:1=-55°Cto+85°C3=0°Cto+70°COutputVoltageLevelandFrequency:H=90VrmsL-L,360-440Hz(Synchroonly)L=11.
8VrmsL-L,360-440Hz(SynchroorResolver)6=90VrmsL-L,47-440Hz(Synchroonly).
SeeNumber2below.
OutputType:DSC=SynchroDRC=Resolver2.
For-6Option:a)For57-440Hzapplication,eitherthetransformerP/NDDC-3932orDDC-25924maybeused.
b)For47-440Hzapplications,transformerP/NDDC-3932mustbeused.
Referencepinsshouldnotbeconnected.
F-10/98-0Theinformationprovidedinthisdatasheetisbelievedtobeaccurate;however,noresponsibilityisassumedbyDataDeviceCorporationforitsuse,andnolicenseorrightsaregrantedbyimplicationorotherwiseinconnectiontherewith.
Specificationsaresubjecttochangewithoutnotice.
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