LP324M中文资料
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LP2902/LP324Micropower Quad Operational AmplifierGeneral DescriptionThe LP324series consists of four independent,high gain in-ternally compensated micropower operational amplifiers.These amplifiers are specially suited for operation in battery systems while maintaining good input specifications,and ex-tremely low supply current drain.In addition,the LP324has an input common mode range,and output source range which includes ground,making it ideal in single supply appli-cations.These amplifiers are ideal in applications which include por-table instrumentation,battery backup equipment,and other circuits which require good DC performance and low supply current.Featuresn Low supply current:125µA (max)n Low offset voltage:2mV (max)n Low input bias current:4nA (max)n Input common mode to GND n Interfaces to CMOS logicn Wide supply range:3V <V +<32V n Small Outline Package available nPin-for-pin compatible with LM324Connection DiagramSimplified SchematicDual-In-Line (N)and SO (M)DS008562-1Order Number LP324M or LP2902M See NS Package Number M14A Order Number LP324N or LP2902N See NS Package Number N14ADS008562-2September 1999LP2902/LP324Micropower Quad Operational Amplifier©1999National Semiconductor Corporation Absolute Maximum Ratings(Note1)If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.Supply Voltage32V or±16V LP290226V or±13V Differential Input Voltage32V LP290226V Input Voltage(Note2)−0.3V to32V LP2902−0.3V to26V Output Short-Circuit to GND Continuous (One Amplifier)(Note3)V+≤15V and T A=25˚CESD Susceptibility(Note10)±500V Operating ConditionsPackageN M Power Dissipation500mW500mW (Note4)T j Max150˚C150˚C θja90˚C/W140˚C/W Operating Temp.Range(Note5)(Note5) Storage Temp.Range−65˚C≤T≤150˚C SolderingInformation(10sec.)300˚C260˚CVapor Phase(60sec.)215˚C Infrared(15sec.)220˚CElectrical Characteristics(Note6)LP2902(Note9)LP324 Symbol Parameter Conditions Tested Design Tested Design UnitsTyp Limit Limit Typ Limit Limit Limits(Note7)(Note8)(Note7)(Note8) V os Input Offset2410249mV Voltage(Max)I b Input Bias2204021020nACurrent(Max)I os Input Offset0.5480.224nACurrent(Max)A vol Voltage R L=10k7040301005040V/mVGain to GND(Min)V+=30VCMRR Common V+=30V908075908075dB Mode Rej.0V≤V cm(Min)Ratio V cm<V+−1.5PSRR Power V+=5V to30V908075908075dB Supply Rej.(Min)RatioI s Supply R L=∞8515025085150250µACurrent(Max) V o Output I L=350µA 3.6 3.4V+−1.9V 3.6 3.4V+−1.9V V Voltage to GND.(Min)Swing V cm=0VI L=350µA0.70.8 1.00.70.8 1.0Vto V+(Max)V cm=0VI out Output V o=3V10741074mASource Source V in(diff)=1V(Min) CurrentI out Output V o=1.5V543543mASink Sink V in(diff)=1V(Min) CurrentI out Output V o=1.5V421421mASink Sink V cm=0V(Min) CurrentI source Output V in(diff)=1V202535202535mAShort to GND3535(Max)I sink Output V in(diff)=1V153045153045mAShort to V+(Max) V os1010µV/C˚2Electrical Characteristics(Note6)(Continued)LP2902(Note9)LP324Symbol Parameter Conditions Tested Design Tested Design UnitsTyp Limit Limit Typ Limit Limit Limits(Note7)(Note8)(Note7)(Note8)DriftI os1010pA/C˚DriftGBW GainBandwidth100100KHzProductS r Slew Rate5050V/mS Note1:“Absolute Maximum Ratings”indicate limits beyond which damage to the device may occur.Operating Ratings indicate conditions for which the device is functional,but do not guarantee specific performance limits.Note2:The input voltage is not allowed to go more than−0.3V below V−(GND)as this will turn on a parasitic transistor causing large currents to flow through the device.Note3:Short circuits from the output to GND can cause excessive heating and eventual destruction.The maximum sourcing output current is approximately30mA independent of the magnitude of V+.At values of supply voltage in excess of15V DC,continuous short-circuit to GND can exceed the power dissipation ratings(par-ticularly at elevated temperatures)and cause eventual destruction.Destructive dissipation can result from simultaneous shorts on all amplifiers.Note4:For operation at elevated temperatures,these devices must be derated based on a thermal resistance ofθja and T j max.T j=T A+θja P D.Note5:The LP2902may be operated from−40˚C≤T A≤+85˚C,and the LP324may be operated from0˚C≤T A≤+70˚C.Note6:Boldface numbers apply at temperature extremes.All other numbers apply only at T A=T j=25˚C,V+=5V,V cm=V/2,and R L=100k connected to GND unless otherwise specified.Note7:Guaranteed and100%production tested.Note8:Guaranteed(but not100%production tested)over the operating supply voltage range(3.0V to32V for the LP324,LP324,and3.0V to26V for the LP2902), and the common mode range(0V to V+−1.5V),unless otherwise specified.These limits are not used to calculate outgoing quality levels.Note9:The LP2902operating supply range is3V to26V,and is not tested above26V.Note10:The test circuit used consists of the human body model of100pF in series with1500Ω.Typical Performance CurvesInput Voltage RangeDS008562-21Input CurrentDS008562-22Supply CurrentDS008562-23Voltage GainDS008562-24Open LoopFrequency ResponseDS008562-25Power SupplyRejection RatioDS008562-26 3Typical Performance Curves(Continued)Application HintsThe LP324series is a micro-power pin-for-pin equivalent to the LM324op amps.Power supply current,input bias cur-rent,and input offset current have all been reduced by a fac-tor of 10over the LM324.Like its predecessor,the LP324se-ries op amps can operate on single supply,have true-differential inputs,and remain in the linear mode with an input common-mode voltage of 0V DC .The pinouts of the package have been designed to simplify PC board layouts.Inverting inputs are adjacent to outputs for all of the amplifiers and the outputs have also been placed at the corners of the package (pins 1,7,8,and 14).Precautions should be taken to insure that the power supply for the integrated circuit never becomes reversed in polarity or the unit is not inadvertently installed backwards in the test socket as an unlimited current surge through the resulting forward diode within the IC could destroy the unit.Large differential input voltages can be easily accommo-dated and,as input differential voltage protection diodes are not needed,no large input currents result from large differen-tial input voltages.The differential input voltage may be larger than V +without damaging the device.Protection should be provided to prevent the input voltages from going negative more than −0.3V DC (at 25˚C).An input clamp diode with a resistor to the IC input terminal can be used.Voltage Follower Pulse ResponseDS008562-27Voltage Follower Pulse Response (Small Signal)DS008562-28Common Mode Rejection RatioDS008562-29Large SignalFrequency Response DS008562-30Output Characteristics Current Sourcing DS008562-31Output CharacteristicsCurrent SinkingDS008562-32Current LimitingDS008562-33 4Application Hints(Continued)The amplifiers have a class B output stage which allows theamplifiers to both source and sink output currents.In appli-cations where crossover distortion is undesirable,a resistorshould be used from the output of the amplifier to ground.The resistor biases the output into class A operation.The LP324has improved stability margin for driving capaci-tive loads.No special precautions are needed to drive loadsin the50pF to1000pF range.It should be noted howeverthat since the power supply current has been reduced by afactor of10,so also has the slew rate and gain bandwidthproduct.This reduction can cause reduced performance inAC applications where the LM324is being replaced by anLP324.Such situations usually occur when the LM324hasbeen operated near its power bandwidth.Output short circuits either to ground or to the positive powersupply should be of short time duration.Units can be de-stroyed,not as a result of the short circuit current causingmetal fusing,but rather due to the large increase in IC chipdissipation which will cause eventual failure due to exces-sive junction temperatures.For example:If all four amplifierswere simultaneously shorted to ground on a10V supply thejunction temperature would rise by110˚C.Exceeding the negative common-mode limit on either inputwill cause a reversal of phase to the output and force the am-plifier to the corresponding high or low state.Exceeding thenegative common-mode limit on both inputs will force theamplifier output to a high state.Exceeding the positivecommon-mode limit on a single input will not change thephase of the output.However,if both inputs exceed the limit,the output of the amplifier will be forced to a low state.In nei-ther case does a latch occur since returning the input withinthe common mode range puts the input stage and thus theamplifier in a normal operating mode.The circuits presented in the section on typical applicationsemphasize operation on only a single power supply voltage.If complementary power supplies are available,all of thestandard op amp circuits can be used.In general,introduc-ing a pseudo-ground(a bias voltage reference to V+/2)willallow operation above and below this value in single powersupply systems.Many application circuits are shown whichtake advantage of the wide input common-mode voltagerange which includes ground.In most cases,input biasing isnot required and input voltages which range to ground caneasily be accommodated.Driving CMOSDS008562-3Comparator with HysteresisDS008562-6Non-Inverting AmplifierDS008562-4Adder/SubtractorDS008562-7Unity Gain BufferDS008562-5Positive IntegratorDS008562-85Application Hints(Continued)Differential IntegratorDS008562-9Howland Current PumpDS008562-10Bridge Current Amplifier DS008562-11µPower Current SourceDS008562-12Lowpass FilterDS008562-13 6Application Hints(Continued)1kHz Bandpass Active FilterDS008562-14Band-Reject FilterDS008562-15Pulse GeneratorDS008562-167Application Hints(Continued)Window ComparatorDS008562-17 8Physical Dimensions inches(millimeters)unless otherwise notedS.O.Package(M)Order Number LP324M or LP2902MNS Package Number M14ADual-in-Line Package(N)Order Number LP324N or LP2902NNS Package Number N14A9NotesLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION.As used herein:1.Life support devices or systems are devices or systems which,(a)are intended for surgical implant into the body,or (b)support or sustain life,and whose failure to perform when properly used in accordance with instructions for use provided in the labeling,can be reasonably expected to result in a significant injury to the user.2.A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system,or to affect its safety or effectiveness.National Semiconductor Corporation AmericasTel:1-800-272-9959Fax:1-800-737-7018Email:support@National Semiconductor EuropeFax:+49(0)180-5308586Email:europe.support@Deutsch Tel:+49(0)180-5308585English Tel:+49(0)180-5327832Français Tel:+49(0)180-5329358Italiano Tel:+49(0)180-5341680National Semiconductor Asia Pacific Customer Response Group Tel:65-2544466Fax:65-2504466Email:sea.support@National Semiconductor Japan Ltd.Tel:81-3-5639-7560Fax:81-3-5639-7507L P 2902/L P 324M i c r o p o w e r Q u a d O p e r a t i o n a l A m p l i f i e rNational does not assume any responsibility for use of any circuitry described,no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.。
