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ANALOG DEVICES fAX-ON-DEMAND HOTLINE - Page 32 r-.ANALOG W DEVICES

FEATURES

LED Display with Latched DigitalOutputs Small Size,Ughtweight Automatic Zero Correction; Max Error:0.05% :t:1 Digit High Normal Mode ReJection:4OdB @ 50 or 60Hz Optional Ratlometric Operation leading "0" Display Blanking 5VDC Powered

APPLICATIONS

MedicaJ/ScientificlAnalyticInstruments Data AcquisitionSystems IndustrialWeighing Systems Radouts in EngineeringUnits Digi18lThennometen GENERAL DESCRIPTION Analog Devices'model AD2010 representsan advance in price! performance capabilitiesof 3~ digitdigitalpanel meters.The AD20l0 offersO.OS% ~l digitmaximum errorwith bipolar, singleended input,resolutionof lO°StV,.anda common mode rejectionratioof 60dB (CMRR) at %lOOm V (CMV). The AD20l0 featuresa light-cmitting-diode(LED) display with a fullscalerange of 0 to ~l99.9 miRivolts,latcheddigital data outputs and controlinterfacesignals,and leadingzero dis- play blanking.Automatic-zero correctioncircuitrymeasures and compensates foroffsetand offsetdrifterrors,thereby providingvirtuallyno error.Another usefulfeatureof the AD20l0 isitsSV de operation.The AD20l0 can operatefrom the users'SV de system supply,therebyeliminatingtheshield- ingand dc:couplingneeded forlinepowered unitswhen the ac linemust be routed near signalleads. To satisfymost applicationrequirements,the conversionrate of the AD2010 isnormal1y 4 readingsper second. However, an externaltriggermay be appliedto vary the sampling ratesfrom a maximum of 24 readingsper second down to an indef'mite hold time.The AD2010 can alsobe connected forautomaric conversionat itsmaximum conversionrate.During conversion, the previousreadingisheld by the latchedlogic.The numeric readout isavailableas BCD da.ta.Applica.tionof themetering system ina computer or data loggingsystem ismade easy with the availabilityof the "overrange,""polarity,It...overload," and "statUs"signals. A simplifiedblock diagram of the AD20l0, illustratingthe featuresdescribedabove isshown in Figure 1. Foe detaikod information, contact &ctmy. REV. A Infonnationfurnishedby Analog Devices isbelievedto be accurateand reliable.However, no responsibilityisassumed by Analog Devicesforits use,nor forany infringementsof patentsor other rightsofthirdparties which may resultfrom itsuse. No licenseisgranted by implicationor otherwise under any patentor patentrightsof Analog Devices. Low Cost,3 1/2Digit DPM forOEM Applications AD2010 I '{.. ..'9 .~~ "", ,,-' :!: -',",: ". "'"'-. ANALOG IN ANALOG GHD DIGITAL GND 6Vdo lieD DATA POu.RITY SIGNAL OVERl,QAI> SIGNAL OVERRANaE SIGNAL STATUS SIGNAl. Figure1.SimplifiedFunctionalBlockDiagram IMPROVED NOISE IMMUNITY, ACCURACY AND ZERO STABILITY Dual-slopeintegration,asused inthe AD2010 and as described inthetbeory of operationsection,offersseveraldesignbenefits. . Conversion accuracy,forexample, isindependent of both the timingcapacitorvalueand the clockfrequency,since they affectboth the up ramp and down ramp integration inthe same ratio. . Normal mode noiseatlinefrequenciesor itsharmonics is rejectedsincethe averagevalue of thisnoiseiszero over the integrationperiod. . To achieveZero stability,a time intervalduringeach conver- sion isprovided to allow the automatic-zerocorrectioncir- cuitryto measure and compensate foroffsetand offsetdrift errors,thereby,providingvirtUallyno zero error. Tel; 617/329-4700 Fax; 617/326.8703 Twx: 710/394-6577 Telex: 924491 Cable: ANALOG NORWOODMASS ANAlOG SECTION DIGITAL SEA:TlCN 31IiDIGIT A TO 0 /888 OBSOLETE

AHALOG DEVICES fAX-OH-DEMAHD HOTLIHE - Page 33 AD2010-SPECIFICATIONS(typicalat+25°C and +5V de unlessotherwisenoted) DISPLA Y OUJ'PUT . DisplayconsistsoffourLED's( 0.27" (6.9mm) high). fOl"datadigitsplus100'11.overrangeand polarity indication. . Overload- three data digitsdisplay zeros and flashes. . Decimal Points- selectableat inputconnector. . Leading"0"DisplayBlanking- controlled externally. INPUT . Full ScaleRange - 0 to :1:199.9millivolts . Automatic Zero . Automatic Polarity . BiasCurrent- 3nA . DC Impcciance- l00MD . OvervoltageProtection- 20V sustained,50V momentary without damage. . Decimal Points(3)- illuminatewith logic"1",extin- guishwith logic"0". ACCURACY . Maximum Error-0.05% ofreading:l:ldigit. Resolution- 0.1 millivolt . T~pera[Ure Range- 0 to+SO°C operating -30°C to +8SoC storage . Temperature Coefficient- :tSOppm/oC NORMAL MODE REJECfION .4OdB @ 60Hz COMMON MODE REJECTION .6OdB @ :t200mV CONVERSION RATE . ExternalTrigger- up to 24 conversions per second . InternalTrigger - 4 conversions per second . Automatic- A new conversion is initiated automatically upon completion of conversion in procC$S;conversion rate wiD vary from 24/Kc (0 4O/sec depending on input magnitude. . Holdand Read upon command. CONVERSION TIME . NormalConversion- 42ms max (full scale input) . OverloadConversion- 62ms max INTERFACE SIGNALS . DTLITTL Compatible logic"0" logic"I" IN <0.8V >2.0V OUT <0.4V >2.4V .InputS External Trigger - Operation in the "External Trigger" mode requiresthat the "EXternal Hold" input be a logic "0" or sround. Neptive Triaer Pulses - Applying a logical"low" to the "HOLD" input disablesthe internaltrigger.A negative triggerpulse (logic"I" to logic"0") of 1.0p.sminimum applied to the "EXT TRIGGER" in- put will initiateconversion in the same manner as the internaloscillator.The eXternal triggershould not be repeated, however, untilthe "status" indicates com- pletion of the convetsion in process. Positive Trigger Pulses - The "HOLD" input can be . used to triggerthe AD20 10 from a "normally low" signalwith the "EXT TRIGGER" input open or logic "1". Following a "hold" a new reading willbe initiatedon the leading edge of the "hold" signal Thus, a mo~ntary positivepulse on the "HOLD" input can be used to triggerthe AD201O. The driftcorrect interval,how- ever,begins on the trailingedge of the positivepulse, so if[he pulse width exceeds 1ms, the conversion will actually be initiatedby the internaltrigger. SpecificationssubjeCtto ebanJe without notice. Maximum Conversion Rate -Automatic - The AD2010 can also be connected for automatic conversion at its maximum conversion rare by connecting the "Status" output back into the "hold" input. In this manner the statussignalgoing high at the end of one conversion immediately initiatesa new conversion. The pu!$es appearing on the statusline can be used to step a multiplexer directly,since the built-indrift-correCt delay of 8.33ms willaRow settlingof the input prior to convCtsion. A logic"0" applied to the "EXT TRIGGER" willinhibit[he automatic triggermode. EXtetnal Hold - Logic "0" or ground applied to this in. put disablesthe internaltriggeran~ the lastconversion is held and displayed. For a new conversion under internal control the input must be opened or at logic"1", For a new conversion under external control,a positivepulse of lessthan 1.0ms can be applied (as previously explained). OUTPUTS . 3 BCD DigitS(8421 PositiveTrue) .latched - 3TTL loads . Overrange -logic "." -latched -6TTL loads, indicates overrange. . Overload.logic"0" indicates overload (>199.9mV) logic"I" -latched.6TTL loads,indicates. datavalid. . Polarity-logic"I" -latched-6TTL loads.indicates positivepolarityinput. . Status-logic"0" -conversioninprocess logic"I" -latched-6TTL loads,indicatescon- versioncomplete:. POWER . +SV dc :1:5%,50OmA WARM UP . Essentiallynone to specifiedaccuracy ADJUSTMENTS . Range potentiometerforfullscalecalibration.Calibra- tionrecommended everysixmonths. SIZE depth forcaseand printedcircuitboard extensionis 1.40"(35.6mm». ORDERING GUIDE . AD2010' StandardAD2010 as describedabove -tUned forpeak normal mode rejectionat60Hz and itS harmonics. WEIGHT . 4 oz.(113.Sgm) OVERALL DIMENSIONS Alldimensions aregivenin inchesand (nun). PIN "A" PIN "S" 1.41 ~ 1 ~ ---, L 0.840 (21.31 MAX. . --1 11-- NORMAL MODE ADJUSTMENT (AD201OR ONLY) -2- REV.A OBSOLETE