GeneralDescriptionTheMAX5422/MAX5423/MAX5424nonvolatile,linear-taper,digitalpotentiometersperformthefunctionofamechanicalpotentiometer,butreplacethemechanicswithasimple3-wireSPI™-compatibledigitalinterface.Eachdeviceperformsthesamefunctionasadiscretepotentiometerorvariableresistorandhas256tappoints.Thedevicesfeatureaninternal,nonvolatileEEPROMusedtostorethewiperpositionforinitializationduringpower-up.The3-wireSPI-compatibleserialinterfaceallowscommunicationatdataratesupto5MHz,mini-mizingboardspaceandreducinginterconnectioncom-plexityinmanyapplications.TheMAX5422/MAX5423/MAX5424providethreenomi-nalresistancevalues:50kΩ(MAX5422),100kΩ(MAX5423),or200kΩ(MAX5424).Thenominalresistortemperaturecoefficientis35ppm/°Cend-to-endandonly5ppm/°Cratiometric.Thismakesthedevicesidealforapplicationsrequiringalow-temperature-coefficientvariableresistor,suchaslow-drift,programmablegain-amplifiercircuitconfigurations.TheMAX5422/MAX5423/MAX5424areavailableina3mmx3mm8-pinTDFNpackage,andarespecifiedovertheextended-40°Cto+85°Ctemperaturerange.ApplicationsMechanicalPotentiometerReplacementLow-DriftProgrammableGainAmplifiersAudioVolumeControlLiquid-CrystalDisplay(LCD)ContrastControlLow-DriftProgrammableFiltersFeatures♦WiperPositionStoredinNonvolatileMemory(EEPROM)andRecalledUponPower-UporInterfaceCommand♦3mmx3mmx0.8mmTDFNPackage♦35ppm/°CEnd-to-EndResistanceTemperatureCoefficient♦5ppm/°CRatiometricTemperatureCoefficient♦50kΩ,100kΩ,and200kΩResistorValues♦5MHzSPI-CompatibleSerialInterface♦500nA(typ)StaticSupplyCurrent♦Single-SupplyOperation:+2.7Vto+5.25V♦256TapPositions♦±0.5LSBDNLinVoltage-DividerMode♦±0.5LSBINLinVoltage-DividerModeMAX5422/MAX5423/MAX5424256-Tap,Nonvolatile,SPI-Interface,DigitalPotentiometers________________________________________________________________MaximIntegratedProducts1OrderingInformation/SelectorGuide19-3371;Rev0;7/04Forpricing,delivery,andorderinginformation,pleasecontactMaxim/DallasDirect!at1-888-629-4642,orvisitMaxim’swebsiteatwww.maxim-ic.com.EVALUATIONKITAVAILABLEPARTTEMPRANGEEND-TO-ENDRESISTANCE(kΩ)PIN-PACKAGETOPMARKMAX5422ETA-40°Cto+85°C508TDFN-EP*AIJMAX5423ETA-40°Cto+85°C1008TDFN-EP*AIIMAX5424ETA-40°Cto+85°C2008TDFN-EP*AIHVDDSCLKDINGND12345WH678LTDFN(3mmx3mm)TOPVIEWCSMAX5422MAX5423MAX5424PinConfigurationWLSPIINTERFACE256-POSITIONDECODERVDDGNDSCLK8-BITNVMEMORY8-BITLATCH8-BITSHIFTREGISTERPORH88256DINCSMAX5422MAX5423MAX5424FunctionalDiagramSPIisatrademarkofMotorola,Inc.*EP=Exposedpad.MAX5422/MAX5423/MAX5424256-Tap,Nonvolatile,SPI-Interface,DigitalPotentiometers2_______________________________________________________________________________________ABSOLUTEMAXIMUMRATINGSELECTRICALCHARACTERISTICS(VDD=+2.7Vto+5.25V,H=VDD,L=GND,TA=-40°Cto+85°C.TypicalvaluesareatVDD=+5.0V,TA=+25°C,unlessotherwisenoted.)Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.VDDtoGND...........................................................-0.3Vto+6.0VAllOtherPinstoGND.................................-0.3Vto(VDD+0.3V)MaximumContinuousCurrentintoH,L,andWMAX5422....................
