-.. ANALOG DEVICES. HighSpeed,LowDrift FEYOperationalAmplifieṛ !'

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1 - ANALOG W DEVCES, - - -:-!' -- - FEATRES Hgh Slew Rte 3V/p,s Fst Settlng to 1%: 7ns Hgh Output Current: 5mA for AD382 (1mA for AD381 Low Drft (5p,Vf'C-L Grdes Low Offset Voltge (25p,V-L Grdes Low nput Bs Currents Low Nose (2p,V pop HghSpeed,LowDrft FEYOpertonlAmplfeṛ PRODCT DESCRPTON The AD3811AD382 re hybrd opertonl mplfers combnng the very low nput bs current dvntges of FET nput stge wth hgh slew rte nd lne drvng cpblty of hgh power output stge The offset voltge (2SmV mxmum for the L grdes nd offset voltge drft (SfLV/oCmxmum for the L grdes re exceptonlly low for hgh speed opertonl mplfers n ddton to superor low drft performnce, the AD381 nd AD382 offer the lowest gurnteed nput bs currents of ny wdebnd FET mplfer wth loopamx for the J grdes of ech nd SOpAmx for the AD382 K, L nd S grdes Snce Anlog Devces, unlke most other mnufcturers, specfes nput bs current wth the mplfers wrmed-up, our FET mplfers re specfed under ctul opertng condtons The AD381 nd AD382 re especlly desgned for use n pplctons, such s precson hgh speed dt cquston systems nd sgnl condtonng crcuts, tht requre excellent nput prmeters nd fst, hgh power output The AD381 nd AD382 re offered n three commercl versons, J, K nd L specfed from to + 7 C, nd one extended temperture verson, the S specfed from - 55 C to c All grdes re pckged n hermetclly seled metl cns PRODCT HGHLGHTS Lser trmmng technques reduce offset voltge drft to SfLVrC mx nd reduce offset voltge to only 2SfLV mx on the L grde versons 2 Anlog Devces FET processng provdes loopa mx (2pA typcl bs currents specfed fter 5 mnutes of wrm-up 3 nternl frequency compenston, low offset voltge, nd full devce protecton elmnte the need for externl components nd djustments Ths reduces crcut se nd complexty nd ncreses relblty 4 The fst settlng output (7ns to 1% mkes the AD381 nd AD382 del for D/A nd AD converter mplfer pplctons 5 The AD382's hgh output current (SOmA mnmum t :t 1 volts mkes t sutble for drvng termnted (2n twsted pr cbles over the commercl temperture rnges 6 The hgh slew rte (3V/fLS nd hgh gn bndwdth product (SMH mke the AD381 nd AD382 n del choce for smple nd holds nd for hgh speed ntegrtor crcuts nformton furnshed by Anlog Devces s beleved to be ccurte nd relble However no responsblty s ssumed by Anlog Devces for ts use; nor for ny nfrngements of ptents or other rghts of thrd prtes whch my result from ts use No lcense s grnted by mplcton or otherwse under ny ptent or ptent rghts of Anlog Devces Route 1 ndustrl Prk; PO Box 28; Norwood, Mss 262 Tel: 617/ TWX: 71/ West Cost Md-West Texs 714/ / /

2 'C Fgure 1 nput Voltge Rnge vs Supply Voltge :;: c! g 'C -r ;! ADJ2 R, = 2n ADJ1 R, = 2kf SPPLY VOLTAGE -- tv Fgure 2 Output Voltge Swng vs Supply Voltge : 2 u 5 15 u : : 1 Vs' t15v = 5mV 5-3 j - - t 1'11 t- r!,t -\ r 1 FREO'1kH,,5V do SPPLES - n 12 c! 1 Fgure 3 Output Voltge Swng vs Lod Resstor forad381 Vs 15V ' 5mV LOAD RESSTANCE-11 Fgure 3b Output Voltge Swng vs Lod Resstor forad ;: B ! Fgure 5 Permtted Dsspton vs Temperture for AD382 1pA 1OOnA-- -JK,L S k TEMPERATRE -- 'c 125 Ė Fgure4 ShortCrcutCurrentvs Temperture for AD381 4 ff 35 : : 3- w :5 ff AD382 [ AD31 SPPLY VOLTAGE - tv Fgure 6 Quescent Current vs Supply Voltge CASE TEMPERATRE -'C Fgure 4b Short Crcut Current vs Temperture for AD ' l-!1: _ ; ; ; L : 25'C 15 2 POWER SPPLY VOLTAGE -- tv Fgure 7 nput Bs Current vs Supply Voltge 2!Z 1nA,--- :,1nAo--- 1pA '----; ;' ;' ; ;' ;' - 5 : 'C Vs t15v 15 25'C 1pA 1pA TEMPERATRE -- 'c Fgure 8 nput Bs Current vs Temperture common MODEVOLTAGE - V Fgure 9 nput Bs Current vs CMV -3- TlME-m;n Fgure 1, nput Offset Voltge Turn On Drftvs Tme

3 SPECFCATONS ModeJ OPEN LOOP GAN Vour = :t JOV,RL2kO(AD381 Vour = :t OV, RL = 2 (AD382 RL = OkO(AD382 OTPT CHARACTERSTCS (AD382 Voltge@RL = 2 Voltge@RL = JOkO Short Crcut Current, Contnuous OTPT CHARACTERSTCS (AD381 Voltge@RL = ko, TA = rnn to mx Voltge@RL = 2kO, TA = rnn to mx Voltge@RL= 1kO, TA = rnntomx Short Crcut Current, Contnuous DYNAMC RESPONSE nty Gn, Smll Sgnl Full Power Response Slew Rte, nty Gn Settlng Tme: 1VSteptoO% 1VStep tooo% NPT OFFSET VOLTAGE vs Temperture, T A = rnn to mx3 vs Supply NPT BAS CRRENT' Ether nput (AD381 Ether nput (AD382 nput Offset Current NPT MPEDANCE Dfferentl Common Mode NPT VOLTAGE RANGE Dfferentls Common Mode Common-Mode Rejecton, VN = :t 1V POWER SPPLY Rted Performnce Opertng Quescent Current AD382 AD381 VOLTAGE NOSE OH-OH 1H 1H 1kH 1kH TEMPERATRE RANGE6 Opertng, Rted Performnce Storge Therml Resstnce- OJA(AD382 Therml Resstnce - OJC(AD382 (typcl@ +25(: ndvs= :!:15Vdc unlessotherwsespecfed AD381JH AD381KH AD381LH AD382jH AD382KH AD382LH 2pA(OOpAmx 2pA(OOpAmx SpA 1O12117pF pF :t2v :t 12V(:t 1Vrnn 76dB rnn :t 15V :t (5 to 18V 34mA(6mAmx 2jLVPOp 35nV/YHZ 22nV/YHZ 18nV/YHZ 16nV/YHZ to + 7 C -65 C to + 15 C loo C/W 7 C/W NOTES 'TheAD382SHbsnoutputvotgeofot2V(o OVmnfor 2flod from Tmnto + looc To + 12SC the output current s3sma 'TheAD381SHbsnoutputvotgeofo12V(oJOVmnfor kf lodfromtmnto +7CFrom + 7Cto + 12SCtheoutputcurrent s7ma 'nput Offset Voltge Drft s specfed wth the offset voltge undulled Nullng wllnduce nddtonl3fl VCfor every mv of offset nulled 6, rnn 1, rnn 25,OOOrnn 35,OOOmn 1, rnn 15,OOOmn :t 12V (:t OV mll :t BV(:t 12Vrnn 8mA :t 12V (:t 1V mll :t 12V (:t OV mll :t BV(:t 12Vrnn 2mA 5MH 5kH 3V/jLs (2V/jLs mll 7ns 12jLs 1pA (5pA mx 8OdBrnn 'Bs Current specfctons re gurnteed mxmum t ether nput fter 5 mnutes of operton t T A = + 2SC For hgher temperrures, the current doubles every JOoe 'Defmed s the mxmum sfe voltge between nputs, such tht nether exceeds o JOV from ground e S-grde s vlble n full complnce wth ML-STD-883 Rev C Ask for the ML-dt sheet Specfctons sme s J grde Specfctons sme s K grde Specfctons subject to chnge wthout notce ORDERNG GDE ntl Model Offset OffsetTC Output Prce (loo's AD381SH AD382SH Note Note 2 1mVmx 15jLV/oCmx 2jLVNmx 12jLs(2jLsmx 5mVmx 1OjLVCmx loojlvnmx 25mVmx 5jLVCmx AD38ljH mv SfLvre loma $ 83 AD381KH OSmV loflvre 1mA $125 AD381LH 2SmV SfLVDe loma $129 AD381SH mv lollvre loma $1625 AD382JH 1mV 15ftVDe SOmA $19 AD382KH O_SmV lollve SOmA $23 AD382LH 2SmV SfLVe SOmA $3 AD382SH 1mV 1fLVre SOmA $ OjLVCmx - 55 C to C J J

4 ' : g w 1 w N :; «' : ,-- 9, C, SPPLYVOLTAGE - tv 12 Fgure 11 Open Loop Gn vs Temperture for AD381 11,----!g 1 Z - « ī g! Fgure llb Open Loop Gn vs Temperture for A !g Fgure 12 Open Loop 1(oltge Gn vs Supply Voltge 12! --J'kn4- - C,5pFAO3821! C,2pFAD381' f k 2k 5k 1k 2k LOAO RESSTANCE- Ohms 5k 6 2 1k O 1k 1k look 1 1 FREQENCY - H, 1M Fgure 13 Voltge Gn vs Lod Resstnce for AD Fgure 13b Voltge Gn vs Lod Resstnce for A Fgure 14 Open Loop Gn vs Frequency ; : «' 4 f 2 R,,kn!g Z 8 ;:: 6 w ' 4 ' 2!g Z 8 ;:: 6!5 ff ;: Vs=t15V t Wpp SNEWAVE M 1M ' 1 1k 1Ok look FREOENCY - H, 1M 1M 1 1k 1Ok look 1M 1M FREQENCY - H, Fgure 15 Phse Mrgn vs Frequency Fgure 16 Common-Mode Rejecton vs Frequency Fgure 17 Power Supply Rejecton vs Frequency == 3 1 «'1< Fgure 18 Lrge Sgnl Frequency Response 4 3 n «: look Fgure 19 Nose vs Frequency 1M 5 ' - Z <5-5 == ' SETTLNGTME- ' Fgure 2 AO381 Output Settlng Tme vs Output Voltge Swng nd Error (Crcut of Fgure 22 :J r l -4-

5 1!! 6 1V 2k 'pf SCOPE VERTCAL 1mV/DV V'RROR VN; ' '-- l- e: Fgure 2b AD382Settlng Tme vs Output Swng nd Error (Crcut of Fgure ;:: ' 4 :; : m CLOSED LOOP GAN - v!v Fgure 21 Settlng Tme vs Closed Loop Gn (Crcuts of Fgures 22 & 23 2 SCOPE VERTCAL NPT REFERENCE -Vs C 2PF Fgure 22 AD381 nty Gn nverter Settlng Tme Test Crcut Fgure 22b AD381 nty Gn nverter Pulse Response (Lrge Sgnl SCOPE VERTCAL - 'mv/dv 2 2 ; R 'pf Fgure 22c AD381 nty Gn nverter Pulse Response (Lrge Sgnl Error Voltge Fgure 22d AD381 nty Gn nverter Pulse Response (Smll Sgnl 5k C1PF -Vs Fgure 23 AD382 nty Gn nverter Settlng Tme Test Crcut Fgure 23b AD382 nty Gn nverter Pulse Response (Lrge Sgnl Fgure 23c AD382 nty Gn nverter Pulse Response (Lrge Sgnl Error Voltge Vs Al 2 &F j Fgure23d AD382 nty Gn nverter Pulse Response (Smll Sgnl -Vs O'F 'PF Fgure 24 AD382 nty Gn Follower Fgure 24b AD382 nty Gn Follower Pulse Response (Lrge Sgnl -5-

6 Ys ' -Vs 7 ',' Fgure 24c A 382 nty Gn Follower Pulse Response (Smll Sgnl Fgure 25 AO382 Overdrve Recovery Test Crcut Fgure 25b AO382 Overdrve Recovery Response Vs 3 25 g 2 ;J: 15 ;: ' 1, AD382 +lv -tv JJ -v, NPT DFFERENTAL VOLTAGE - <V Fgure 26 Slew Rte vs nput Voltge 16 Fgure 27 AO381 Overdrve Recovery Test Crcut Fgure 27b AO381 Overdrve Recovery Response Ys ' RL 2kf! J -Vs O,' 'o, Rgum28 Follower AO381nftyGm Fgure 28b AO381 nty Gn Follower Lrge Sgnl Pulse Response Compenston Cpctor The AD381 nd AD382 hve suffcent phse mrgn to nsure stblty n most pplctons wthout compenston However, n pplctons wth cpctve lod, very hgh speed, low gn or hgh resstor vlues (RN,5kO the hgh frequency nose rejecton wll be mproved by ddng compenston cpctor The AD381 nd AD382 hve n nput cpctnce of 7pF When soldered on prnted crcut bord or nserted n socket the totl nput cpctnce could be lopf Ths nput cpctnce cn lower the phse mrgn crossover pont from 8MH, s shown n Fgure S, to round MH By ddng smll compenston cpctor n the feedbck loop we cn cncel the effects of the nput cpctnce nd reduce hgh frequency nose gn 5 to lopf wll suffce n most pplctons n some current output, dgtl-to-nlog converter pplctons the output cpctnce of the DAC my be 2pF whch would requre lrge compenston cpctor n the mplfer feedbck loop A scheme for compenstng nvertng nd nonnvertng crcuts s shown n Fgure 29 Choose CF = CN Rl -L CON R2 C, AD381 OR AD382 +/ (NCLDE HGH FREQENCY SQRCE MPEDANCE N Rll nvertng Amplfer C, b Nonnvertng Amplfer Fgure 29

7 Offset Null The AD3811AD382 should not hve to be offset nulled for most pplctons becuse of ts low ntl offset voltge f nullng s requred for very hgh precson pplctons, such s n output mplfer for 13-bt or better dgtl-to-nlog converters, connect lokn potentometer between the offset null pns (pns nd 5 for the AD381 nd pns 2 nd 8 for the AD382 The wper of the potentometer s ted to the negtve supply Wth the nlog nput sgnl to the crcut grounded, djust the potentometer for ero output DGTAL NPTS AD7545 AD382 Het Snkng A het snk for convecton coolng s requred f opertng t full power nd t mbent tempertures greter thn 7 C As shown n Fgure 5 the free r power dsspton curve for the AD382 crosses the full power dsspton pont (75W t 7 C The power dsspton cn be mproved by usng het snk up to the cse power dsspton curve (lso referred to s the nfnte het snk power dsspton curve We recommend connectng the het snk to the AD382 cse nd keepng the combnton ungrounded The cse of the AD382 s not connected to ny pn nd should be llowed to flot TYPCAL CRCTS n mny dgtl-to-nlog converter pplctons, ncludng utomtc test equpment, the lod my be lrge enough to requre buffer mplfer The AD382 cn supply:!: lov nto 2 lod The AD381 cn supply up to :!:1V nto 1kn lod The AD381 nd AD382 re lso well suted for CMOS DAC output mplfer pplctons due to ther low ntl offset voltge Fgure 31 CMOS DAC Output Amplfer NPT GROND 1kl! lok!' 3pF' 3pF RF 1kl! AGND 'Optonl Dfferentl nput Components sed to Reject Nose Between nput Gund nd the AD Anlog Gund AD T AD Fgure 32 Fst-Settlng Buffer DGTAL OTPTS Mny hgh speed AD convertersrequre wdebndbuffer tht cn hold constnt output voltge under dynmclly-chngng lod condtons tht fluctute t the bt decson rte ts quck recovery from lod vrtons mkes the AD382 n excellent buffer for fst successve pproxmton AD converters 12-81T DGTAL NPT Your Fgure 3 Buffer Amplfer to 12-Bt Voltge Output DAC No externl trms re requred wth 12-bt CMOS DACs Snce the output mpednce of CMOS DACs vres wth nput code, the output voltge could pper nonmonotonc f the offset voltge s greter thn 12LSB An LSB for 12-bt DAC such s the AD7545 s 244mV (1 volts full scle/496 Thus the AD381 nd AD382, wth only 1mV of offset mxmum, ssure monotonc performnce wthout externl trms -7-

8 R C R/2 C NOTCHFREQENCY= Fgure 33 Hgh Q Notch Flter 6 The bove notch flter wll hve notch of - SS To obtn Q of 1 the cpctors should be well mtched Polystyrene, Teflon or NPO cermc cpctors nd metl-f1lm resstors re recommended For low frequency flter pplctons resstor vlues wll be lrge The AD381 s well suted for ths pplcton due to ts low nput bs current t s lso good for hgh frequency flterng becuse of ts wde gn bndwdth product Ths flter s cpble of drvng k!1 lods over :t JOV output rnge Fgure 34 shows fst smple nd hold crcut tht cn cqure smple to 1% n 2J1s(2 volt swng The AD381 s well suted for fst 12-bt smple/hold mplfer crcuts R nd R2 set the crcut gn R3 s djusted for mnmum c feedthrough Potentometer R4 s set for mnmum smple/hold offset voltge R6 mproves the settlng tme nd crcut stblty by ddng phse mrgn Bs resstors R7 nd R8 nsure complete shut-off of the D-MOS FET swtches t TTL logc ero Pull up resstors R9 nd RO lower the on resstnce of the D-MOS swtches The SDSOOOD-MOS swtch s recommended for ts fst trnston speed nd low on resstnce 5V, SAMPLE RO 22kl! OV \ HOLO 1/6 74LS4 +5V +5V R 3kl! R6 15kl! R2 3kl1 CHDLD 47OpF VDT Ln co r:: Ln N Fgure 34 Fst Smple/Hold Amplfer OTLNE Dmensons DMENSONS shown n nches nd (mm TO-99 PACKAGE (AD381 AD381 PN CONFGRATON TOP VEW TAB tt-t REF PLANE 165 ( (47 37 S4O = 35( (SOO = = 4MAX (12 MAX-J 1--,J,-- [ = ;;':: NYpRJNG(2 OFFSET OFFSET SEATNGPLANE' --:J L :1]1 4 (25 (121 4 V- 5L T L KEEP THS LEAD AS SHORT AS POSSBLE T-8 STYLE CAN PNS ARE GOLD PLATED OTLNE DMENSONS Dmensons shown n nches nd (mm TO-8 STYLE PACKAGE (AD ( O:'' '15 L (42 T 375 L f (s5lng, MN 18 (461 DA AD382 PN CONFGRATON TOP VEW OFFSET Nll OFFSET Nll V- KEEP THS LEAD AS SHORT AS POSSBLE < u1 : w : D BOTTOM VEW -8-