RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
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- Patricia Carpenter
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1 DVNCD INR DVICS, INC. D74/D74B RITORI CMOS OPRTION MPIFIR GNR DSCRIPTION Th D74/D74B/ is a CMOS monolithic oprational amplifir with MOSFT input that has railtorail input and output voltag rangs. Th input voltag rang and output voltag rang ar vry clos to th positiv and ngativ powr supply voltags. Typically th input voltag can yond positiv powr supply voltag V, or th ngativ powr supply voltag V y up to 3mV. Th output voltag swings to within 6mV of ithr positiv or ngativ powr supply voltags at ratd load. This dvic is dsignd as an altrnativ to th popular JFT input oprational amplifirs in applications whr lowr oprating voltags, such as 9V attry or ±3.25V to ±5V powr supplis ar ing usd. It offrs high slw rat of 5V/µs at low oprating powr of 3mW. Sinc th D74/D74B/ is dsignd and manufacturd with dvancd inar Dvics' standard nhancd CMOS silicon gat CMOS procss, it also offrs low unit cost and xcptional rliaility. Th railtorail input and output fatur of th D74/D74B/ allows a lowr oprating supply voltag for a givn signal voltag rang and allows numrous analog srial stags to implmntd without losing oprating voltag margin. Th output stag is dsignd to driv up to m into 4pF capacitiv and.5kω rsistiv loads at unity gain and up to 4 pf at a gain of 5. Short circuit protction to ithr ground or th powr supply rails is at approximatly 5m clamp currnt. Du to complmntary output stag dsign, th output can oth sourc and sink m into a load with symmtrical driv and is idally suitd for applications whr pushpull voltag driv is dsird. Th offst voltag is trimmd onchip to liminat th nd for xtrnal nulling in many applications. For prcision applications, th output is dsignd to sttl to.% in 2µs. For larg signal uffr applications, th oprational amplifir can function as an ultra high input impdanc voltag followr/uffr that allows input and output voltag swings from positiv to ngativ supply voltags. This fatur is intndd to gratly simplify systms dsign and liminat highr voltag powr supplis in many applications. dditionally, roust dsign and rigorous scrning mak this dvic spcially suital for opration in tmpraturxtrm nvironmnts and ruggd conditions. FTURS Railtorail input and output voltag rangs 5.V/µs slw rat Output sttls to 2mV of supply rails High capacitiv load capaility up to 4pF Symmtrical pushpull output drivs No frquncy compnsation rquird unity gain stal xtrmly low input ias currnts.p typical (2pMax) Idal for high sourc impdanc applications High voltag gain typically 5V/mV Output short circuit protctd Unity gain andwidth of 2.MHz Suital for ruggd, tmpraturxtrm nvironmnts PPICTIONS Voltag amplifir Voltag followr/uffr Charg intgrator Photodiod amplifir Data acquisition systms High prformanc portal instrumnts Signal conditioning circuits ow lakag amplifirs ctiv filtrs Sampl/Hold amplifir Picoammtr Currnt to voltag convrtr Coaxial cal drivr Capacitiv snsor amplifir Pizolctric transducr amplifir PIN CONFIGURTION ORDRING INFORMTION ( suffix dnots ladfr (RoHS)) Oprating Tmpratur Rang C to 7C C to 7C 55 C to 25 C 8Pin 8Pin 8Pin Small Outlin Plastic Dip CRDIP Packag (SOIC) Packag Packag D74S D74P D74D D74BS D74BP D74BD D74S D74P D74D D74GS D74GP D74GD * Contact factory for ladd (nonrohs) or xtndd high/low tmpratur vrsions. N/C IN IN V TOP VIW S, P, D PCKGS * N/C pins ar intrnally connctd. Do not connct xtrnally N/C V OUT N/C Rv 2. 2 dvancd inar Dvics, Inc. 45 Tasman Driv, Sunnyval, C Tl: (48) Fax: (48)
2 BSOUT MXIMUM RTINGS Supply voltag, V.6V Diffrntial input voltag rang.3v to V.3V Powr dissipation 6 mw Oprating tmpratur rang S, P packags C to 7C D packag 55 C to 25 C Storag tmpratur rang 65 C to 5C ad tmpratur, sconds 26C CUTION: SD Snsitiv Dvic. Us static control procdurs in SD controlld nvironmnt. OPRTING CTRIC CHRCTRISTICS unlss othrwis spcifid 74 74B 74 74G Tst Paramtr Symol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Conditions Supply V S ±3.25 ±5. ±3.25 ±5. ±3.25 ±5. ±3.25 ±5. V Dual Supply Voltag V V Singl Supply Input Offst V OS mv R S KΩ Voltag mv C T 7C Input Offst I OS p Currnt p C T 7C Input Bias I B p Currnt p C T 7C Input Voltag V IR ±5. V Rang Input R IN Ω Rsistanc Input Offst TCV OS µv/ C R S KΩ Voltag Drift Powr Supply PSRR db R S KΩ Rjction Ratio C T 7C Common Mod CMRR db R S KΩ Rjction Ratio C T 7C arg Signal V V/ mv R = KΩ Voltag Gain V/ mv No oad V/ mv C T 7C Output V O low V R = KΩ Voltag V O high C T 7C Rang V O low V R =MΩ V O high C T 7C Output Short I SC m Circuit Currnt Supply Currnt I S m = V No oad Powr P D mw V S = ±5. Dissipation No oad Input C IN pf Capacitanc Bandwidth B W MHz Slw Rat S R V/µs V = R = 2.KΩ Ris tim t r.... µs R = 2.KΩ Ovrshoot % R = 2.KΩ Factor C = pf D74/D74B dvancd inar Dvics 2 of 9
3 OPRTING CTRIC CHRCTRISTICS (cont'd) unlss othrwis spcifid 74 74B 74 74G Paramtr Symol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Tst Conditions Maximum oad C pf Gain = Capacitanc pf Gain = 5 Input Nois Voltag n nv/ Hz f = KHZ Input Currnt Nois i n f/ H Z f = HZ Sttling t s µs.% Tim µs.% V = R = 5KΩ C = 5pF 55 C T 25 C unlss othrwis spcifid 74D 74BD 74D Paramtr Symol Min Typ Max Min Typ Max Min Typ Max Unit Tst Conditions Input Offst Voltag V OS mv R S KΩ Input Offst Currnt I OS n Input Bias Currnt I B... n Powr Supply PSRR db R S KΩ Rjction Ratio Common Mod CMRR db R S KΩ Rjction Ratio arg Signal V V/mV R = KΩ Voltag Gain Output Voltag V O low V R = KΩ Rang V O high V R = KΩ D74/D74B dvancd inar Dvics 3 of 9
4 Dsign & Oprating Nots:. Th D74/D74B/ CMOS oprational amplifir uss a 3 gain stag architctur and an improvd frquncy compnsation schm to achiv larg voltag gain, high output driving capaility, and ttr frquncy staility. Th D74/ D74B/ is intrnally compnsatd for unity gain staility using a novl schm that producs a clan singl pol roll off in th gain charactristics whil providing for mor than 7 dgrs of phas margin at th unity gain frquncy. unity gain uffr using th D74/D74B/ will typically driv 4pF of xtrnal load capacitanc without staility prolms. In th invrting unity gain configuration, it can driv up to 8pF of load capacitanc. Compard to othr CMOS oprational amplifirs, th D74/D74B/ has shown itslf to mor rsistant to parasitic oscillations. 2. Th D74/D74B/ has complmntary pchannl and nchannl input diffrntial stags connctd in paralll to accomplish rail to rail input common mod voltag rang. This mans that with th rangs of common mod input voltag clos to th powr supplis, on of th two diffrntial stags is switchd off intrnally. To maintain compatiility with othr oprational amplifirs, this switching point has n slctd to aout.5v aov th ngativ supply voltag. Sinc offst voltag trimming on th D74/ D74B/ is mad whn th input voltag is symmtrical to th supply voltags, this intrnal switching dos not affct a larg varity of applications such as an invrting amplifir or noninvrting amplifir with a gain largr than 2 (V opration), whr th common mod voltag dos not mak xcursions low this switching point. 3. Th input ias and offst currnts ar ssntially input protction diod rvrs ias lakag currnts, and ar typically lss than p at room tmpratur. This low input ias currnt assurs that th analog signal from th sourc will not distortd y input ias currnts. For applications whr sourc impdanc is vry high, it may ncssary to limit nois and hum pickup through propr shilding. 4. Th output stag consists of symmtrical class B complmntary output drivrs, capal of driving a low rsistanc load with up to m sourc currnt and m sink currnt. Th output voltag swing is limitd y th drain to sourc onrsistanc of th output transistors as dtrmind y th ias circuitry, and th valu of th load rsistor. Whn connctd in th voltag followr configuration, th oscillation rsistant fatur, comind with th railtorail input and output fatur, maks th D74/D74B/ an ffctiv analog signal uffr for mdium to high sourc impdanc snsors, transducrs, and othr circuit ntworks. 5. Th D74/D74B/ oprational amplifir has n dsignd to provid full static discharg protction. Intrnally, th dsign has n carfully implmntd to minimiz latch up. Howvr, car must xrcisd whn handling th dvic to avoid strong static filds that may dgrad a diod junction, causing incrasd input lakag currnts. In using th oprational amplifir, th usr is advisd to powr up th circuit for, or simultanously with, any input voltags applid and to limit input voltags to not xcd.3v of th powr supply voltag lvls. TYPIC PRFORMNC CHRCTRISTICS COMMON MOD INPUT VOTG RNG (V) ±7 ±6 ±5 ±4 ±3 COMMON MOD INPUT VOTG RNG S FUNCTION OF SUPPY VOTG ±2 ±2 ±3 ±4 ±5 ±6 ±7 SUPPY VOTG (V) OPN OOP VOTG GIN (V/mV) OPN OOP VOTG GIN S FUNCTION OF SUPPY VOTG ND TMPRTUR } 55 C } 25 C } 25 C ±2 ±4 ±6 SUPPY VOTG (V) R = KΩ R = 5KΩ ±8 INPUT BIS CURRNT (p).. 5 INPUT BIS CURRNT S FUNCTION OF MBINT TMPRTUR MBINT TMPRTUR ( C) SUPPY CURRNT (m) SUPPY CURRNT S FUNCTION OF SUPPY VOTG T = 55 C 25 C 25 C 8C 25 C ± ±2 ±3 ±4 ±5 ±6 SUPPY VOTG (V) INPUTS GROUNDD OUTPUT UNODD D74/D74B dvancd inar Dvics 4 of 9
5 TYPIC PRFORMNC CHRCTRISTICS (cont'd) OUTPUT VOTG SWING (V) ±7 ±6 ±5 ±4 ±3 ±2 OUTPUT VOTG SWING S FUNCTION OF SUPPY VOTG 55 C T 25 C R = KΩ R = KΩ R = 2KΩ ± ±2 ±3 ±4 ±5 ±6 ±7 SUPPY VOTG (V) OPN OOP VOTG GIN (db) OPN OOP VOTG S FUNCTION OF FRQUNCY 2 8 K K K M M FRQUNCY (Hz) PHS SHIFT IN DGRS INPUT OFFST VOTG (mv) INPUT OFFST VOTG S FUNCTION OF MBINT TMPRTUR RPRSNTTIV UNITS MBINT TMPRTUR ( C) INPUT OFFST VOTG (mv) INPUT OFFST VOTG S FUNCTION OF COMMON MOD INPUT VOTG COMMON MOD INPUT VOTG (V) OPN OOP VOTG GIN S FUNCTION OF OD RSISTNC 5 VOTG NOIS DNSITY S FUNCTION OF FRQUNCY OPN OOP VOTG GIN (V/mV) VOTG NOIS DNSITY (nv/ Hz) K K K K OD RSISTNC (Ω) K K K FRQUNCY (Hz) K RG SIGN TRNSINT RSPONS SM SIGN TRNSINT RSPONS 5V/div R = KΩ C = 5pF mv/div V S = ± 5.V R =.KΩ C = 5pF 5V/div 2µs/div 5mV/div µs/div D74/D74B dvancd inar Dvics 5 of 9
6 TYPIC PPICTIONS RITORI VOTG FOOWR/BUFFR RITORI VOTG COMPRTOR Z IN ~ = 2 Ω V V 4pF.µF C R.5KΩ 2V 5K 2V.µF M OW OFFST SUMMING MPIFIR PHOTO DTCTOR CURRNT TO VOTG CONVRTR R F = 5M K 5K INPUT INPUT 2 K GIN = 5 * Circuit Drivs arg oad Capacitanc 4pF 5V 5V.µF.µF C = 4pF PHOTODIOD I 5V 5V = I X R F R.5K WIN BRIDG OSCITOR (RITO RI) SIN WV GNRTOR BNDPSS NTWORK C 2 5V 5V K C R R 2 5V C =.µf.µf K R = K f = ~ 2πRC = ~.6K Hz K ow Frquncy Brakpoint ƒ = = 6Hz 2π R C High Frquncy Cutoff ƒh = = 32KHz 2π R2C2 5V R = K C = nf R 2 = K C 2 = 5pF OW PSS FITR (RFI FITR) PRCISION CHRG INTGRTOR R F K 5K 5K R R 9V C.2µF Cutoff frquncy = = 3.2kHz π RC MΩ pf 5V 5V Gain = Frquncy rolloff 2dB/dcad D74/D74B dvancd inar Dvics 6 of 9
7 SOIC8 PCKG DRWING 8 Pin Plastic SOIC Packag Millimtrs Inchs S (45 ) D Dim C D8 Min Max Min Max BSC.5 BSC H S S (45 ) H C D74/D74B dvancd inar Dvics 7 of 9
8 PDIP8 PCKG DRWING 8 Pin Plastic DIP Packag Millimtrs Inchs Dim Min Max Min Max c S D D S c D74/D74B dvancd inar Dvics 8 of 9
9 CRDIP8 PCKG DRWING 8 Pin CRDIP Packag Millimtrs Inchs D Dim Min Max Min Max s C D BSC BSC 7.62 BSC BSC S Ø 5 5 C D74/D74B dvancd inar Dvics 9 of 9
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