SHA4

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SAMPLE-AND-HOLD AMPLIFIERS SHA-IA,'lA,3,4,5,6"---=- GENERAL DESCRIPTION Analog Devices'wide selectionof Sample-and-Hold Amplifiers (SHA's) permitsthe selectionof a SHA thatiswell suitedfor virtuallyany application.Each type offersa unique combina- tionof speed,accuracy,and cost. SHA-IA The SHA-1A isa generalpurpose SHA offeringmoderately high speed and accuracy ata reasonableprice.Itsettlesto 0.01% inunder5IJ.S,and itsdrooprate(decaywhen inHOLD) isno greaterthan 50pV IIJ.S. SHA-2A The SHA-2A isa very fastSample-and-Hold module with ac- curacy and dynamic performance thatmake itappropriatefor use with very fast12 bitAID converters.Itsettlesto 0.1% in lessthan 300ns,and to 0.01% inlessthan 500ns. SHA-3 and SHA-4 These two SUA's were designedforhigh accuracyat longer hold times.They settleto 0.01% in75ps or less.The two differ inthatwhen switched from HOLD to SAMPLE, the SHA-4 settlesmore rapidlythan does the SHA-3. f l t l SHA-5 The SHA-5 isa low costgeneralpurpose sample-and-holdthat offersgood performance ata very low price.Itsettlesto 0.01% in 15ps,and has a droop rateof only 5pV Ims. SHA-6 The SHA-6 was designedas a companion to the high resolution ADC-16QA/D converter.Itwillacquirea signalto 16 bitac- curacy (0.00075%) in 5ms, and then hold itlong enough for the ADC-16Q to convertitto a 16 bitdigitalword. Itfeatures excellentgainstabilityover both time and temperatUre. BLOCK DIAGRAM SHA-2A ILLUSTRATION OF SPECIFICATIONS HOLD TO SAMPLE I ,ACOUISITION 1 INPUT --1 r-- TIME I OUTPUT I I~'APERTURE I SETTJ.d TIME I TIME : IN SAMPLE I LOGIC~ '1 --- 0 l HOLO J- SAMPLE-+I ITRACK' -of -I<-,.OLOTO SAMPLE DROOP' I ACOUISITION TIME IN HOLD I c:= I -r-SAMPLEHOLD PIN DESIGNATIONS: SHA-5 1.ANALOG GROUND 2. -15V 3. +15V 4. N.C. 5. N.C. 6. SIGNAL IN 7. CONTROL IN 8. LOGIC GROUND 9. N.C. 10. N.C. 11. N.C. 12. ANALOG OUTPUT 13.NO PIN 14.N.C. TOO CONVERTERS OBSOLETE

0.0007S% IOmV/sec Max :!:l1V I to 1000 :!:0.2%4 109n -1.71/5 -10ns 17mA 2" x 4" x 0.4" C-3 5375. CD E eft Z..I I Mode controlinputon allSHA's isTTLlDTL compatible.On allmodels exceptSHA-6, Logic "I" issample and Logic "0" ishold.On SHA-6, Logic "0" issample and Logic "I" ishold. 2SHA-2A may be used as a follower or inverter.It can also be used at gains higher than unity with appropriate degradation in bandwidth. 3SHA-3 and SHA-4 differonly in that SHA-4 settlesmuch fasterwhen switched from HOLD to SAMPLE. SettlingTime to :!:1m V is lOOp:;for SHA-3 and 20p:; for SHA-4. . 4Gain error from formula used to calculatevalue of gain resistor.Gain stabilityis:to.0002%/month and :!:0.0002%f C. SHA-IA

1 CONTROL

0 :N ANALOG 28 0IN ANALOG 26 0GRDPIN DESIGNATIONS: SHA-6 I I t 16. 18. 19. 36. 37. 59. 64. 67. 69. 0 4 DIGITALGRD 0 6 ANALOGGRD+EOUT -EOUT -15V ANALOG COMMON +15V MODE CONTROL INPUT MODE CONTROL COMMON -EIN GAIN CONTROL +EIN GAIN CONTROL Top View NANALOG WOEVICES MADE IN U.S.A.010 -15V 012P~'ii'~R ANALOG 17 0OUT ANALOG 15 0GRD014 +15V SHA 1A SAMPLE HOLD AMPLIFIER SHA-5 NOTE: The pinslistedabove arethe only pinsthatappear on the SHA-6. Top View SHA-2A Top View CONVERTERS 101 - -.-- SPEOFICATION SUMMARY (Typical @ +25°C unless otherwise noted) APPLICATIONS General Fast Low Droop Low Droop Low Purpose Slow Setde Fast Setde Colt Modell SHA-IA SHA-lA2 SHA-33 SHA-43 SHA-S Acquisition SI/5to SOOns to 7S1/5to 7S1/5to IS/olSto Droop Rate SO/olVIms Max 10/olV/1/5 10/olV/ms 10/olV/ms S/olV/ms Input Range :tIOV :tIOV :tIOV :tIOV :tIOV Gain I I I I I Input 1O'lnImpedance 1O'2n 10'n lOan 4 x 109n Apenure Delay 4Ons IOns SOns SOns 40ns Aperture -} Jitter Sns 0.2Sns 5ns 5ns 4ns Power Require- menu :t15V @ lSmA lOOmA ISmA ISmA 2SmA Package Style C-l C-2 C-4 C-4 C-4 (100+) 532. OBSOLETE

The SHA IA isa fastsample-and-hold module with low droop rateand overallaccuracy compatible with 12-bitA/D conversionsystems opera- tingto %LSB accuracy.When inthe "sample" mode, the module appears as a fastamplifierwith 51lssettlingtime to 0.01%, 1nA input current, 251lVIC drift,and unity gain with :t10V at :t20mA output current capability.When in the "hold" mode, the droop rate is501lV/ms max, so the SHA IA willhold an input signalto 0.01% of fullscale(20V pop) for 40ms, sufficientfor 12-bitA/D conversion. SAMPLE TO HOLD CHARACTERISTICS Of prime importance in selectingSample-and-Hold amplifiersis the transitioncharacteristicswhen the module iscommanded intohold by the digitalcontrol line.A finitedelay willoccur between initiationof the hold command, and actualdisconnectionof the hold capacitorfrom the input buffer amplifier.In the SHA lA, thisdelay time is40ns maxi- mum. The uncertainty,or jitterover which thisdelay time willvary from cycle to cycle,as the module isrepeatedlycomma,nded intohold, is:t5ns.In most systems,the jitterspecificationisthe limitingfactoron overallsystem speed for a given accuracy, since fixeddelays can be re- moved by adjusting the system timing. The 5ns jitterspecification means the SHA IA can track a signal slewing up to 0.2V Ills,and "capture" thatsignalto within a 1mV accuracy for A/D conversion. OVERALL ACCURACY The SHA IA isguaranteed to have an overallthroughput non linearity of 2mV max over a :t10V input range, or 1mV max over 0 to +10V inputs.This specificationcombines the effectsof common mode errors. gain non linearityand sample to hold offsetnonlinearity.Itisno longer necessaryto guess at the combined effectsof individualerrorssincethe SHA IA specificationguarantees that itstotalnon-linearityerrorsare sufficientlylow to insure%LSB accuracy in 12-bitsystems. GROUNDING Many data acquisitionsystems sufferfrom digitalground induced noise appearing in the analog system. To counteractthisproblem, the SHA IA hasthreeseparategroundsystems.The digitalground isactual~ Iy one sideof a differentialamplifier,with the Sample/Hold digital controlinputbeingthe other inputof thisamplifier.Thiseffectively prevents digitalground noise from being impressed into the analog signalchannel.The power ground and analog input/outputgrounds are also separate,so that power supply ground noise isreduced by the re- jectioncoefficientsof the amplifiers,normally well over 9OdB. Ground connection instructionsaregivenin Figure 1. A DC path must existbetween the Analog, Digital,and power supply grounds. Multiplegrounds on signaland power return lines should be avoided. If possible, only one externalground should existon theAnalog ground system ANALOG iN CONTROL ANALOG iNGRO iNPUT ANALOG I - SIGNAL OIGITAL CONTROL SIGNAL -= DIG GRD ANALOGOUTPUT ANALDG OUT ANALOG GRD -15 PWR GRD -15 CO., I POWERSUPPL Y .15 0'5 = Fig. 1 SHA fA Connections and Grounding PRINTED IN U.S.A.CO98c-1 0-1 /80 ---- -..ANALOG W DEVICES OBSOLETE

SPECIFICATIONS(tvPi~.1 0'" 'k ' ..C and nominaJ. supply voltages, unfes$otherwise noted. ..W ~ ?<j1: ' OU~ Ou' Max imum to~ . 4, at Output? DIGITAL CONTR' Logic levels(OT (!'1")Sampkf p~., ("0") HOld ,59 at4OnA: V to +O.BV at 20~ POWER REQUIREMENTS ...'" '" m :l:t5VDCat+tOmA,-t5mA (:1:3%toleranceon voltage), 'f"" TEMPERATURE RANGE ", Rated AcCuracy Storage 0°C~o.+10°C -55°C to +85°C Specificationssubjectto change without notice OUTLINE DIMENSIONS AND PIN CONNECTIONS (In Inches) 010J~2.0 J---t30 TYP --.l~25 MIN 18 1 r-°1 KEY0 l'81.7

028 Analog Input Cont,"1 In 10 U

G,ound 0;g;1al Ground 40 11.4 Analog Ground 60 112 -15VOC 100 0.5 017 Analog Output ~~:U';;d 120 0.5 13\\ 015 Analog Ground +15VOC 140 0,3 ° 80TTOM VIEW Reference for P;n Loca1;on Pins: 0.019 :1:.001dia, Gold plated half-hard brass,per MIL-G-45204. Pin designationsareshown on bottom view forreferenceonly. SAMPLE TO HOLD SWITCHING 3OOn0 /' INPU OUTPUT ',,"Vim.mu -I 1--+i.!i.NGTIME ACQUISITION TIME IN SAMPLE IHOLD TO SAMPLE! ... TO 0.01" ...TO 0.01" "1" SAMPLE "O"HOLDJ "0" HOLD Fig. 2 Illustrationof Dynamic Specifications(not to scale) OTHER PRODUCTS MultiplexerMPX-8A Available with 8 channels,digitalad- dressing,expandable to 64 channels.In- put range :t10V with standard:t15VDC supplies.Mosfet design prevents burn out due to power failure,-80dBcross- talk,2J.1.smax switchingtime.Accuracy to 0.01%. Analog to DigitalConverter ADC-OM Available in 8-, 10-,or 12-bitresolu- tion and accuracy.A 25J.1.sconversion time and low 5ppmtC gain TC. 2" x 4" x 0.4" package. Analog to DigitalConverter ADC-120Z An economical 12 bit device with a 40J.l.sconversion time. Package size is 2" x 4" x 0.4" OBSOLETE