AD346_15 AD | Alldatasheet

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ANALOG DEVICES fAX-ON-DEHAND HOTLINE - Page 111 -. ANALOG WDEVICES I

FEATURES

Fast2.0fLSAcquisitionTime to :0.01% Low Droop Rate:O.5mV/ms Low Offset Low Glitch:<40mV ApertureJitter:4OOps Extended Temperature Range: -55"C to + 125.C InternalHold Capacitor MIL-STD-883B ProcessingAvailable PRODUCT DESCRIPTION The AD346 isa high speed (2J.lSto0.01%), adiustmem free sample-and-holdamplifierdesignedforhigh throughput rate data acquisitionapplications.The fastacquisitiontime (211s(0 0.01%) and low aperturejitter(400ps)make itsuitableforuse with fastAID converterstodigitizesignalsup to97kHz. The AD346 iscomplete with an internalhold capacitorand it incorporatesa compensationnetwork which minimizesthesample tohold chargeoffset.The AD346 isalsolasertrimmed toeliminate the need forexternaltrimming potentiometers. TypicalapplicationsfortheAD346 includesampled datasystems, D/A deglitchers,peak hold functions,strobcdmeasurement systemsand simultaneoussampling convertersystems. The deviceisavailablein tWo versions:the "J" specifiedfor operationover the0 to + 700C commercial temperaturerange and the "S" specifiedover theextended temperaturerange, -55°C to + 125°C. ORDERING GUIDE *DH-14A = Ceramic DIP. REV. A Informationfurnishedby Analog Devices isbelievedto be accurateand reliable.However, no responsibilityisassumed by Analog Devicesforits use: nor forany infringementsof patentsor otherrightsofthirdparties which may resultfrom itsuse. No licer\\$eisgranted by implicationor otherwiseunder any patentor patentrightsof Analog Devices. HighSpeed Sample-and- Hold Amplifier AD346 I FUNCTIONAL BLOCK DIAGRAM +vs 8) ~~~t~ S)~~~LOG PRODUCT HIGHLIGHTS 1. The AD346 isan improved second sourceforothersample and holdsof the same pin configuration. 2. The AD346 providesseparateanalogand digitalgrounds, thusimproving thedevice'simmunity toground and switching transients. 3. The droop rateisonly O.SmV/ms so thatitmay be used in slowerhigh accuracysystemswithout thelossof accuracy. 4. The fastacquisitiontime and low aperturemake itsuitable forvery high speed dataacquisitionsystems. PIN CONFIGURATION

13 I ANAlOG INPUT

DlGrrAL OND I . ANAlOG GND L.! OFFSET AOJ r7 !JOFFSET AOJ

81 ANALOG OUTPUT

Tel: 617/329-4700 Fax; 6171326-8703 Twx: 710(354-6577 Telex: 924491 Cable: ANALOG NORWOODMASS Temperature Package MocIcl Range Option. AD 346JD Oto +700C DH-14A AD346SD -55°to+ 125°C DH-14A AD346SD/883B - SSOC'to+ J2S.C DH-14A OBSOLETE

ANALOG DEVICES fAX-ON-DEMAND HOTLINE - Page 11 AD346-SPECIFICATIONS(typical@ +25°C, Vs = :t15Y unlessotherwisenoted) NOTES 'Maximum outpUt swing is4V lesstban + Vs. *Specificationssame as AD346JD. Specificationssubjectto change without notice. -2- REV. A Model AD 346JD AD346SD Units ANALOG INPUT VoltageRange :!:1O.0 * Volts InputImpedance 3.0 * kO DIGITAL INPUT "0" InputThresholdVoltage(Hold) +O.8max * Volts "1" InputCurrent 2.0min * Volts "0" InputCurrent -360JLA(max) * JLA "I" InputCurrent 20JLA(max) * JLA TRANSFER CHARACTERISTICS Gain -1.0 '" VN Gain Error :!::0.02max (:!:0.01typ) '" %FSR Gain Error, T miD-T max :!::O.05max( :to.O3 typ) * %FSR OffsetVoltage :!::3max(:tltyp) '" mV OffsetVoltage, Tmin- T max :!::20max(:!:6typ) * mV Pedestal :!::4max(:t2ryp) * mV Pedestal,T miD-T""'" :!::20max(:t8typ) :t20max(:!:10typ) mV Droop Rate O.Smax(O.l ryp) * mV/ms Droop Rate, T min-T mu: 60 max (20typ) 650 max (200typ) mV/ms DYNAMIC CHARACTERISTICS FullPower Bandwidth Vour= +lOV, -3dB 1.4 * MHz Output Slew Rate 50 * V/JLS AcquisitionTime To :!::O.OI%10VStep Z.Omax (1.0typ) * IJ.S To :!::0.01%20V Step 2.5max(1.6typ) * IJ.S ApertU1'eDelay 60 max (30ryp) * os ApertureJitter 0.4 * ns SettlingTime Sample Mode (10V Step) 2.0max(1.0typ) * IJ.S Sample toHold SOO * ns Feedthrough(Hold Mode) at1kHz 0.02max (0.005typ) '" %FSR TransientPeak Amplitude Sample/Hold/Sample 40 * mV ANALOG OUTPUT Output VoltageSwing I :!:IO.Omin * Volts Output Current 3.0 '" mA POWER REQUIREMENTS OperatingVoltageRange :tlZto:!:18 * Volts Supply Current +V 18max (9typ) '" mA -V -lOmax(-3typ) * mA Power Supply RejectionRatio 100 * JLVN Power Consumption 500 max(ZOOtyp) * mW OBSOLETE

ANALOG DEVICES fAX-ON-DEMAND HOTLINE - Page 12 AD346 3.2 %.II iUz 2.0 ~~ u8 1.Z0( 0.8 0.4 10 150 5 OUTPUT VOLTAGE SWING Figure1.AcquisitionTime vs.Output Voltage 4.0 3.5 3.2 i u ~ U i 2.0:I ~ 1.6 1.2 0.1 0..4 -II -25 0 +10 +1211+25 TEMPERATUIIf -"C Figure2. AcquisitionTime vs.Temperature 5IH OFFSETINMV -55 0 +125+25 +10-25 TEMPERATURE - "C Figure3. S/H OffsetDrift(Typical) 460 405 360 ~ 315 ~ 210 i!:225 B 180Q 135 110 -55 +70 +125-111 0 +25 TEMPERATURE - "C Figue 4. Droop vs. Temperature (;1:5Volts) GROUNDING Many data-acquisitioncomponents have two or more ground pinswhich arenot connected togetherwithinthe device.These "grounds" areusuallyreferredtoas the Logic Power Return, Analog Common (Analog Power Return),and Analog Signal Ground. These grounds must be tiedtogetheratone point, usuallyatthe system power-supplyground. Ideally,a single solidground would be desirable.However, sincecurrentflows through theground wiresand etchstripesof the circuitcards, and sincethesepathshave resistanceand inductancc,hundreds of millivoltscan be generatedbetween the system ground point and the ground pinsof tbe AD346. Separateground retUrns should be providedto minimize the currentflow in the path from sensitivepointsto the system ground point.In thisway supply currentsand logic-gatereturncurrentsare not summed intothe same returnpath as analogsignalswhere tbey would causemeasurement errors. REV,A SIGNAL GROUND DIGITAL DATA OUTPUTAD ADC8S 'If INDEPENDENT, OTHERWISE RETURN AM~LIFI~II REf£A~NCE TO MECCA AT ANALOG P.S.COMMON Figure5. BasicGrounding Practice -3- 0.01"f$R --- V Input-"'SV 0.01%FSR I

0.1 F$R

J I I I I OBSOLETE

0 TO 1OV

13 AO3411 6

Figure 6. 153kHz-12-Bit,AID Conversion System Figure 7. 142.8kHz-72-Bit,AID Conversion System Dimensions shown in inches and (mm).