AD2025

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e ,.ANALOG W DEVICES

FEATURES

"Second Generation" MOS-lSI Design large 0.43" (11mm) lED Displays 4* DigitResolution- 40,000 Counts FullScale limited DifferentialInput EitherLine Powered (AD2025) or logic Powered (AD2028) Interchangeablewith 4% DigitDPMs (AD2024 or AD2027) IndustryStandard Case Designs

APPLICATIONS

High Resolution/High Accuracy Readout for: Test Equipment ProcessControl Instrumentation Analyticaland ScientificInstruments GENERAL DESCRIPTION The AD2025 and AD2028 arelow cost4% digitDPMs with largeLED displays.Both unitsofferthe same featuresand iden- ticalperformance, but the AD2025 isac linepowered and the AD2028 is+5V dc powered. The AD2025 and AD2028 are interchangeablewith two 4\\-2 digitDPMs availablefrom Analog Devices,the AD2024 and AD2027 respectively.Thus, they can be used in applications where eithera 4% or 4\\-2digitdisplaymay be desirableinone basicapplication. THE BENEFITS OF SECOND GENERATION DESIGN The AD2025 and AD2028 aredesignedaround MOS-LSI (Metal Oxide Semiconductor, Large ScaleIntegration)inte- gratedcircuitswhich greatlyreduce the number of components and interconnectionsrequiredto providethe performance and featuresexpected ina high resolution4% digitDPM. This "Second Generation" design,therefore,offersgreatly increasedreliabilityand significantlylower costat littlecom- promise inperformance. The large0.43 inch (11mm) LED dis- playsofferthe brightnessand readabilitypreviouslyavailable only with gas dischargedisplayswith the added advantage of an allsolidstatecomponent. HIGH RESOLUTION AND VERSATILE FEATURES These DPMs measure DC inputvoltagesover a fullscalerange of :t3.9999V or :t39.999V with an accuracy of :to.005% reading :to.005% of fullscale:tldigit.Using the "limiteddifferential~, inputfirstused by Analog Deviceson the AD2010, the AD2025 and AD2028 prevent ground loop problems and pro- vide 50dB of common mode rejectionat common mode vol- tagesup to :t200mV. Normal mode rejectionis25dB at 50-60Hz. Information furnished by Analog Devices is believed to be accurate and reliable.However. no responsibilityisassumed by Analog Devices for itsuse; nor for any infringements of patents or other rightsof third parties which may result from itsuse. No licenseisgranted by implica- tion or otherwise under any patent or patent rightsof Analog Devices. Low Cost4% Digit DPMs WithLEDDisplays -I j:" 'Ii.) , .""> ~;'- -.1 \\: "'~ " ' . ~'"'\\ ., ...' BCD data outputs areprovided in a bitparallel,characterserial format compatible with CMOS logicsystems.When applica- tionsrequireparallelBCD data,such as interfacesto printers, comparators or slavedisplays,parallelBCD output optionsare availablethatarecompatible to standardTTL logicsystems. Externalpower supply outputs at +5V and -25V (-25V only on the AD2028) aremade availableforpowering externalcir- cuitry.In addition,controlinputsfor conversion "Hold", displayblanking and decimal point selectionareprovided. INDUSTRY STANDARD CASE DESIGNS Although both the AD2025 and AD2028 have identicalelec- tricaldesigns,they arepackaged in the casesizesthathave become industrystandardsforac linepowered and +5V dc logicpowered DPMs respectively.The AD2025 fitsthe 3.924" x 1.682" (99.67 x 42.74mm) panel cutout common to most ac linepowered DPMs, and the AD2028 fitsthe 3.175" x 1.810" (80.65 x 45.97mm) panel cutout of the Analog Deviceslogic power casedesign,now used by severalother manufacturers of logicpowered DPMs. Thus, interchangeabilityisassured, allowingmechanical second sourcingforboth theseDPMs. DESIGNED AND BUILT FOR RELIABILITY Even beyond the reliabilityadvantagesof the LSI-IC design and LED displays,the AD2025 and AD2028 have had extreme caretaken in theirdesignand manufacture to insurereliability. Manufacturing processesaremonitored by continualquality assuranceinspectionsto insureproper workmanship and test- ing.AutomatictestequipmentisusedtotesteachDPM thor- oughlyand withouterror.And eachAD2025 and AD2028, likeeveryAnalogDevicesDPM, receivesa fullone week failure- freeburn-inwith power cyclingbefore shipment. Tel:617/329-4700 Twx: 710/394-6577 Telex: 924491 Cables: ANALOG NORWOODMASS OBSOLETE

SPECIFICATIONS (typicalat+25°Candnominalpowersupplyvoltage) EXTERNAL POWER SUPPLY OUTPUTS .AD2025: +5V at 25mA, -25V at SmA . AD2028: -25V at SmA POWER SUPPLY INPUTS . AD2025:ac line,50-60Hz, 4W . AD2028: 5V dc,:!:5%at 800mA CALIBRATION ADjUSTMENTS . Gain . Zero . Recommended recalibrationinterval:6 months DISPLAY OUTPUTS . SevenSegment LED Display,0.43"(llmm) high,for fourdatadigitsand 300% overrange. . Overloadindicationby blankingalldigitsexceptover- range,which indicates"0". . Decimalpoints(5)selectableatinput. . DisplayBlanking ANALOGINPUT . Configuration:Bipolar,limiteddifferential . FullScaleRange::!:3.9999V(:!:39.999V,"V" option) . AutomaticPolarity(Seeapplicationssectionfordetails on polaritydisplay) . InputImpedance:1O0Mn (lMn. "V" oPtion) . BiasCurrent:30nA (3nA,"V" option) . OvervoltageProtection:120V rms sustained ACCURACY . :!:0.005%reading:!:0.005%fullscale:!:1digiti . Resolution:100llV(lmV, "V" option) . TemperatureRange2: 0 to+50°C operating.-20 to+85°C storage.(AD2025/B: 0 to+45°C operatin8) . TemperatureCoefficient:Gain::!:30p~m/C.ZeroOffset: :!:lOllV/C(:!:40ppm/Cand :!:IOOllV/C, "V" option) . Warmup Time: One minutetoratedaccuracy . SettlingTime toRated Accuracy:450ms NORMAL MODE REJECTION . 25dB at 50-60Hz COMMON MODE REJECTION .50dB, DC to 1kHz, :!:200mV common mode voltage . AD2025 (floatedon power supply transformerifdata out- puts and controlsignalsare not used) - II0dB at 120V rms common mode voltage,Ikn imbalance at input. CONVERSION TIME . 300ms forfullscalereading . 400ms foroverload conversion CONVERSION RATE . 3 conversionsper second DIGITAL INTERFACE SIGNALS . Inputs Display Blank - (open collectorTTL Compatible, 4 TTL Loads). Logic "0" or grounding blanksdisplay,but not decimal points.The displayisvalidimmediately upon removal of the blanking signal. Hold - (DTL/TTL Compatible, 2 TTL Loads). Logic "0" or grounding causesthe DPM to hold and displaythe last conversion.Upon removal of the hold,the DPM resumes conversIOns. Decimal Points- (Not TTL Compatible). Logic "0" or grounding turns on appropriatedecimal point.External circuitrymust sink 35mA when a decimal point is illuminated. . Outputs DTL/TTL Compatible3- Status. Logic" 1" indicates con- versionin process.Alldigitaloutputs arevalidwhen status isat logic"0". 4 TTL loads.- Polarity.Logic "I" indi- cates positivepolarity,unlatched.6 TTL loads.- Over- load, Logic "I" indicatesoverload (:;>40,000),unlatched 4 TTL Loads. CMOS and LP Schottky Compatible - BCD outputs,4% BCD digits,characterserial,bitparallel,I LP Schottky load. ParallelBCD Output (Option"B"). - 4% BCD digits, positivetrue,latched.Drives 5 TTL loads.- Data Ready. Logic" I" indicatesoutput data isvalid.Drives2 TTL loads.- Polarity.Logic "I" indicatespositivepolarity, latched,Drives2 TTL loads. SIZE . AD2025: 3.92"W x 1.67"Hx 4.48"D (l00 x 42 x 114mm) Panelcutout:3.930"x 1.682"(99.8x 42.7mm) . AD2028: 3"W x 1.8"Hx 4"D (76x 46 x 102mm) Panelcutout:3.175"x 1.810"(80.65x 45.97mm) WEIGHT . AD2025: 14 ounces (395 grams) . AD2028: 10 ounces(280grams) OPTIONS - ORDERING GUIDE4 . AD2025 AC Power Inputs - No costoption AD2025 - 117V ac AD2025/E - 220V ac AD2025/F - 100V ac :!:IO% AD2025/H - 240V ac Input Range Options - No costoption AD2025 - :!:3.9999VFull Scale AD2025/V - :!:39.999VFullScale Data Output Options AD2025 - Character serialdata outputs AD2025/B - ParallelBCD option Display Lens Options5 Lens 7 - Red with ADI logo Lens 8 - Red without ADI logo Connector - 36 pin,0.156" spacing,card edge connector, Viking 2VK18DIl-2 or equivalent.- Optional:Order AC2610. AD2025/B option alsorequiresa 30 pin,0.156" spacing, card edge connector,Viking 2VKI5D/I-2 or equivalent. - Optional: Order ACI501. . AD2028 Input Range OPtions - No cost option AD2028 - :!:3.9999V Full Scale AD2028/V - :!:39.999V Full Scale Data Output Options AD2028 - Character serialdata outputs AD2028/B - Parallel BCD option Display Lens OPtions5 Lens 5 - Red with ADI logo Lens 6 - Red without ADI logo Connector - ACI501 (see above) or equivalent. AD2028/B option requires two each. NOTES 1 Guaranteedat+25°C and nominalpower supplyvoltage. 2Guaranteed. 3For CMOS compatibility,3.3k pullup resistorsto the +5V output of the DPM are required. 4Only one AC Power Input and/or Input Range option may be specified. The "8" option can be ordered with any combination of power and range options. 'Ifno lensisspecified,Lens 5 or 7 issuppliedas appropriate. Specificationssubjectto change without notice. -2- OBSOLETE

PARALLEL.DATA READY FLAG (NOTE 2) APPLYING THE AD2025 AND AD2028 Wirim! Connections Figures 1 and 2 arewiringdiagrams forAD2025 and AD2028 applications.The "limiteddifferential"inputusesa lOOn resistorto isolatethe analog inputfrom the digitaland power supply sectionsto prevent ground loop problems.The analog input must be connected between the "analog high" and "analog ground" inputsonly,sincein some applicationsthere may be up to a :t200mV CMV differencebetween analog and digitalgrounds. "">cOG HIGH '.K Figure 1.AD2025Wiring Interconnections Figure2.AD2028 Wiring Interconnections PolarityIndication No directpolarityindicationisprovidedon the AD2025 or AD2028 although both DPMs measure bipolarinputs.If indicationof negativepolarityisdesired,the "polarity"out- put can be connected to the farleft-handdecimal point (DP .XXXXX) provided.When the polarityisnegative,this decimal pointwillthen be illuminated. InterfacingData OutPuts The standarddata outputs are ina bitparallelcharacterserial format compatible to CMOS and LP Schottky logicsystems. The BCD outputs are multiplexed,and a digitoutput ispro- vided for each of the fivedigitsof output. Thus, the four BCD lineson the output at a given time are validfor the digitwhose digitlineiscurrentlyhigh.The bitparallel characterserialdata isvalidwhen the DPM statuslineis low for a period of 150ms between each conversioncycle. The overload lineislatched output which isat logic"1", whenever the input exceeds the full40,000 count range. Optional parallelBCD outputs ("B" option) areavailableon a separatecard which isinternallyconnected to the DPM. The output data then ispresentedina fullparallelformat and is latched.The paralleldata isvalidwhenever the data ready output ishigh. Pin connections forthe "B" option areshown inthe intercon- nection tablesand a fulltimingdiagram isshown in Figure 3. INTEGRATION CYCLE j I I I I ' "-- ". ',' "', SIGNAL REFERENCE IOIL RECOVER & I INTEGRATE INTEGRATE I IDLE TIME I ,150m» (200n" MAX) :(150m> MIN) I STATUS ~ I rI I, I I I : U ! --ii--NOTE 1 I II NOTE 1. APPROXIMATE Sm> REOUIRED TO LOAD PARALLEL.QUT REGISTERS. NOTE 2. BOPTION. Figure3. AD2025/AD2028 Timing Diagram NOTE 1: BCD multiplexerclock pulse availablefor remote placement of BCD option. AD2025 - Signaland PinConnections AD2028 - Signaland Pin Connections NOTES: 11 Overload output ison main DPM connector.

21 Pins marked "In" are made availablefor remote

placement of BCD option card and are not normally used sinceallconnections are intemal. AD2025/AD2028 BCD Options - Signaland Pin Connections -3- PIN FUNCTION PIN FUNCTION

1 Analog Gmund A Analog High

2 10' Digit B 10' Digit(LSDI =KEY = KEY

3 BCD2 C 10' Digit

4 10' Digit D BCD 4 S BCD8 E BCD 1

6 Mux Step' F 10' DigitIMSDI

.7 +5V de (Out) H -25V de (Outl

8 NC J NC

9 AC High K AC High

10 NC L NC

12 NC N NC

13 DigitalGround P DigitalGryund

14 DP .XXXXX R Status

15 Polarity S Hold

16 Display Blank T DPX.XXXX 17 DPXXXX.X U DPXX.xXX 18 Overload V DPXXX.XX PIN FUNCTION PIN FUNCTION

1 Analog High A Analog Ground

2 10' Digit(LSDI B Mux Step'

3 BCD 8 C BCD 1

4 BCD 2 D BCD 4

5 10' Digit(MSD) E 10' Digit 6 10' Digit F 10' Digit

7 NC H -25V de (Out)

8 Power Ground J DigitalGround

9 +5V (In) K +5V (In) =KEY = KEY 11 Display Blank M DP.XXXXX

12 Hold N Polarity

13 Overload P Status

14 DPX.XXXX R DPXX.XXX 15 DPXXX.XX S DPXXXX.X PIN FUNCTION

1 I +5V de linl

2 IBCD I (lnl

= KEY

3 BCD 4 (lnl

4 BCD 2000

5 BCD 40

6 BCD 800

7 BCD 100

8 BCD 10,000

9 BCD 20

10 BCD8

11 BCD 1

12 BCD 400

13 Data Ready

14 PolarityIlnl

15 Polarity(Out)

A BCD 20,000 B IBCD 8 (In) = KEY C BCD 2 (Inl D BCD4 E BCD 80 F BCD 8000 H BCD 1000 J BCD 200 K BCD2 L BCD 10 M BCD 4000 N 10' Digit(lnl P Status IInl R Mux Step (lnl S Digi"'lGround OBSOLETE

Figure 4. AD2025Mechanical Outline