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1、ICL713541/2Digit,BCDOutput,A/DConverterTheIntersilICL7135precisionA/Dconverter,withitsmultiplexedBCDoutputanddigitdrivers,combinesdual-slopeconversionreliabilitywith+1in20,000countaccuracyandisideallysuitedforthevisualdisplayDVM/DPMmarket.The2.0000Vfullscalecapabili
2、ty,auto-zero,andauto-polarityarecombinedwithtrueratiometricoperation,almostidealdifferentiallinearityandtruedifferentialinput.AllnecessaryactivedevicesarecontainedonasingleCMOSlC,withtheexceptionofdisplaydrivers,reference,andaclock.TheICL7135bringstogetheranunpreced
3、entedcombinationofhighaccuracy,versatility,andtrueeconomy.Itfeaturesauto-zerotolessthan10µV,zerodriftoflessthan1µV/℃,inputbiascurrentof10pA(Max),androllovererroroflessthanonecount.TheversatilityofmultiplexedBCDoutputsisincreasedbytheadditionofseveralpinswhichallowit
4、tooperateinmoresophisticatedsystems.TheseincludeSTROBE,OVERRANGE,UNDERRANGE,RUN/HOLDandBUSYlines,makingitpossibletointerfacethecircuittoamicroprocessororUART.Features*AccuracyGuaranteedto+1CountOverEntire20000Counts(2.0000VFullScale)*GuaranteedZeroReadingfor0VInput*
5、1pATypicalInputLeakageCurrent*TrueDifferentialInput*TruePolarityatZeroCountforPreciseNullDetection*SingleReferenceVoltageRequired*OverrangeandUnderrangeSignalsAvailableforAuto-RangeCapability*AllOutputsTTLCompatible*BlinkingOutputsGivesVisualIndicationofOverrange*Si
6、xAuxiliaryInputs/OutputsareAvailableforInterfacingtoUARTs,Microprocessors,orOtherCircuitry*MultiplexedBCDOutputs*Pb-FreeAvailable(RoHSCompliant)DetailedDescriptionAnalogSectionEachmeasurementcycleisdividedintofourphases.Theyare(1)auto-zero(AZ),(2)signal-integrate(IN
7、T),(3)de-integrate(DE)and(4)zero-integrator(Zl).Auto-ZeroPhaseDuringauto-zero,threethingshappen.First,inputhighandlowaredisconnectedfromthepinsandinternallyshortedtoanalogCOMMON.Second,thereferencecapacitorischargedtothereferencevoltage.Third,afeedbackloopisclosedar
8、oundthesystemtochargetheauto-zerocapacitorCAZtocompensateforoffsetvoltagesinthebufferamplifier,integrator,andcomparator.Sincethecomparator
