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1、ICL713541/2Digit,BCDOutput,A/DConverterTheIntersilICL7135precisionA/Dconverter,withitsmultiplexedBCDoutputanddigitdrivers,combinesdual-slopeconversionreliabilitywith+1in20,000countaccuracyandisideallysuitedforthevisualdisplayDVM/DPMmarket.The2.0000Vfullsc
2、alecapability,auto-zero,andauto-polarityarecombinedwithtrueratiometricoperation,almostidealdifferentiallinearityandtruedifferentialinput.AllnecessaryactivedevicesarecontainedonasingleCMOSlC,withtheexceptionofdisplaydrivers,reference,andaclock.TheICL7135br
3、ingstogetheranunprecedentedcombinationofhighaccuracy,versatility,andtrueeconomy.Itfeaturesauto-zerotolessthan10µV,zerodriftoflessthan1µV/℃,inputbiascurrentof10pA(Max),androllovererroroflessthanonecount.TheversatilityofmultiplexedBCDoutputsisincreasedbythe
4、additionofseveralpinswhichallowittooperateinmoresophisticatedsystems.TheseincludeSTROBE,OVERRANGE,UNDERRANGE,RUN/HOLDandBUSYlines,makingitpossibletointerfacethecircuittoamicroprocessororUART.Features*AccuracyGuaranteedto+1CountOverEntire20000Counts(2.0000
5、VFullScale)*GuaranteedZeroReadingfor0VInput*1pATypicalInputLeakageCurrent*TrueDifferentialInput*TruePolarityatZeroCountforPreciseNullDetection*SingleReferenceVoltageRequired*OverrangeandUnderrangeSignalsAvailableforAuto-RangeCapability*AllOutputsTTLCompat
6、ible*BlinkingOutputsGivesVisualIndicationofOverrange*SixAuxiliaryInputs/OutputsareAvailableforInterfacingtoUARTs,Microprocessors,orOtherCircuitry*MultiplexedBCDOutputs*Pb-FreeAvailable(RoHSCompliant)DetailedDescriptionAnalogSectionEachmeasurementcycleisdi
7、videdintofourphases.Theyare(1)auto-zero(AZ),(2)signal-integrate(INT),(3)de-integrate(DE)and(4)zero-integrator(Zl).Auto-ZeroPhaseDuringauto-zero,threethingshappen.First,inputhighandlowaredisconnectedfromthepinsandinternallyshortedtoanalogCOMMON.Second,ther
8、eferencecapacitorischargedtothereferencevoltage.Third,afeedbackloopisclosedaroundthesystemtochargetheauto-zerocapacitorCAZtocompensateforoffsetvoltagesinthebufferamplifier,integrator,andcomparator.Sincethecomparator
