The12-channelAD8802/AD8804providesindependentdigitally-controllablevoltageoutputsinacompact20-leadpackage.ThispotentiometerdividerTrimDAC(allowsreplacementofthemechanicaltrimmerfunctioninnewdesigns.TheAD8802/AD8804isidealfordcvoltageadjustmentapplications.
Easilyprogrammedbyserialinterfacedmicrocontrollerports,theAD8802withitsmidscalepresetisidealforpotentiometerreplacementwhereadjustmentsstartatanominalvalue.Applicationssuchasgaincontrolofvideoamplifiers,voltagecontrolledfrequenciesandbandwidthsinvideoequipment,geometriccorrectionandautomaticadjustmentinCRTcomputergraphicdisplaysareafewofthemanyapplicationsideallysuitedfortheseparts.TheAD8804providesindependentcontrolofboththetopandbottomendofthepotentiometerdividerallowingaseparatezero-scalevoltagesettingdeterminedbytheVREFLpin.Thisishelpfulformaximizingtheresolutionofdeviceswithalimitedallowablevoltagecontrolrange.
InternallytheAD8802/AD8804contains12voltage-outputdigital-to-analogconverters,sharingacommonreference-voltageinput.
EachDAChasitsownDAClatchthatholdsitsoutputstate.TheseDAClatchesareupdatedfromaninternalserial-to-parallelshiftregisterthatisloadedfromastandard3-wireserialinputdigitalinterface.Theserial-data-inputwordisdecodedwherethefirst4bitsdeterminetheaddressoftheDAClatchestobeloadedwiththelast8bitsofdata.TheAD8802/AD8804consumesonly10µAfrom5Vpowersupplies.Inaddition,inshutdownmodereferenceinputcurrentconsumptionisalsoreducedto10µAwhilesavingtheDAClatchsettingsforuseafterreturntonormaloperation.
TheAD8802/AD8804isavailableinthe20-pinplasticDIP,theSOIC-20surfacemountpackage,andthe1mmthinTSSOP-20package.
