LF353

LF353Wide Bandwidth Dual JFET Input Operational AmplifierGeneral DescriptionThese devices are low cost,high speed,dual JFET input operational amplifiers with an internally trimmed input offset voltage (BI-FET II ™technology).They require low supply current yet maintain a large gain bandwidth product and fast slew rate.In addition,well matched high voltage JFET input devices provide very low input bias and offset currents.The LF353is pin compatible with the standard LM1558allowing designers to immediately upgrade the overall performance of existing LM1558and LM358designs.These amplifiers may be used in applications such as high speed integrators,fast D/A converters,sample and hold circuits and many other circuits requiring low input offset voltage,low input bias current,high input impedance,high slew rate and wide bandwidth.The devices also exhibit low noise and offset voltage drift.Featuresn Internally trimmed offset voltage:10mV n Low input bias current:50pA n Low input noise voltage:25nV/√Hz n Low input noise current:0.01pA/√Hzn Wide gain bandwidth:4MHz n High slew rate:13V/µs n Low supply current: 3.6mA n High input impedance:1012Ωn Low total harmonic distortion :≤0.02%n Low 1/f noise corner:50Hz nFast settling time to 0.01%:2µsTypical Connection 00564914Simplified Schematic1/2Dual00564916Connection DiagramDual-In-Line Package00564917Top ViewOrder Number LF353M,LF353MX or LF353N See NS Package Number M08A or N08EBI-FET II ™is a trademark of National Semiconductor Corporation.December 2003LF353Wide Bandwidth Dual JFET Input Operational Amplifier©2003National 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 Voltage ±18VPower Dissipation(Note 2)Operating Temperature Range 0˚C to +70˚CT j (MAX)150˚CDifferential Input Voltage ±30V Input Voltage Range (Note 3)±15VOutput Short Circuit Duration Continuous Storage Temperature Range −65˚C to +150˚CLead Temp.(Soldering,10sec.)260˚CSoldering Information Dual-In-Line Package Soldering (10sec.)260˚CSmall Outline Package Vapor Phase (60sec.)215˚C Infrared (15sec.)220˚CSee AN-450“Surface Mounting Methods and Their Effect on Product Reliability”for other methods of soldering surface mount devices.ESD Tolerance (Note 8)1000V θJA M PackageTBDNote 1: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.Elec-trical Characteristics state DC and AC electrical specifications under particu-lar test conditions which guarantee specific performance limits.This assumes that the device is within the Operating Ratings.Specifications are not guar-anteed for parameters where no limit is given,however,the typical value is a good indication of device performance.DC Electrical Characteristics(Note 5)Symbol ParameterConditionsLF353Units MInTyp Max V OS Input Offset VoltageR S =10k Ω,T A =25˚C 510mV Over Temperature 13mV ∆V OS /∆T Average TC of Input Offset Voltage R S =10k Ω10µV/˚C I OS Input Offset Current T j =25˚C,(Notes 5,6)25100pA T j ≤70˚C4nA I B Input Bias Current T j =25˚C,(Notes 5,6)50200pA T j ≤70˚C 8nA R IN Input ResistanceT j =25˚C1012ΩA VOLLarge Signal Voltage GainV S =±15V,T A =25˚C 25100V/mVV O =±10V,R L =2k ΩOver Temperature15V/mVV O Output Voltage Swing V S =±15V,R L =10k Ω±12±13.5V V CM Input Common-Mode Voltage V S =±15V±11+15V Range−12V CMRR Common-Mode Rejection Ratio R S ≤10k Ω70100dB PSRR Supply Voltage Rejection Ratio (Note 7)70100dB I SSupply Current3.66.5mAAC Electrical Characteristics(Note 5)SymbolParameterConditionsLF353UnitsMinTyp MaxAmplifier to Amplifier CouplingT A =25˚C,f=1Hz−20kHz −120dB (Input Referred)SR Slew RateV S =±15V,T A =25˚C 8.013V/µs GBW Gain Bandwidth Product V S =±15V,T A =25˚C 2.74MHze n Equivalent Input Noise Voltage T A =25˚C,R S =100Ω,16f=1000Hzi nEquivalent Input Noise CurrentT j =25˚C,f=1000Hz0.01L F 353 2AC Electrical Characteristics (Continued)(Note5)Symbol Parameter Conditions LF353UnitsMin Typ MaxTHD Total Harmonic Distortion A V=+10,RL=10k,V O=20Vp−p,BW=20Hz-20kHz<0.02%Note2:For operating at elevated temperatures,the device must be derated based on a thermal resistance of115˚C/W typ junction to ambient for the N package, and158˚C/W typ junction to ambient for the H package.Note3:Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.Note4:The power dissipation limit,however,cannot be exceeded.Note5:These specifications apply for V S=±15V and0˚C≤T A≤+70˚C.V OS,I B and I OS are measured at V CM=0.Note6:The input bias currents are junction leakage currents which approximately double for every10˚C increase in the junction temperature,T j.Due to the limited production test time,the input bias currents measured are correlated to junction temperature.In normal operation the junction temperature rises above the ambient temperature as a result of internal power dissipation,P D.T j=T A+θjA P D whereθjA is the thermal resistance from junction to e of a heat sink is recommended if input bias current is to be kept to a minimum.Note7:Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice.V S =±6V to±15V.Note8:Human body model,1.5kΩin series with100pF.Typical Performance CharacteristicsInput Bias Current Input Bias Current0056491800564919Supply Current Positive Common-Mode Input Voltage Limit0056492000564921LF3533Typical Performance Characteristics(Continued)Negative Common-Mode Input Voltage LimitPositive Current Limit0056492200564923Negative Current Limit Voltage Swing0056492400564925Output Voltage Swing Gain Bandwidth0056492600564927L F 353 4Typical Performance Characteristics(Continued)Bode PlotSlew Rate0056492800564929Distortion vs.Frequency Undistorted Output Voltage Swing0056493000564931Open Loop Frequency Response Common-Mode Rejection Ratio0056493200564933LF3535Typical Performance Characteristics(Continued)Power Supply Rejection RatioEquivalent Input Noise Voltage0056493400564935Open Loop Voltage Gain (V/V)Output Impedance0056493600564937Inverter Settling Time00564938L F 353 6Pulse ResponseSmall Signaling Inverting00564904Large Signal Inverting00564906Small Signal Non-Inverting00564905Large Signal Non-Inverting00564907Current Limit(R L=100Ω)00564908Application HintsThese devices are op amps with an internally trimmed inputoffset voltage and JFET input devices(BI-FET II).TheseJFETs have large reverse breakdown voltages from gate tosource and drain eliminating the need for clamps across theinputs.Therefore,large differential input voltages can easilybe accommodated without a large increase in input current.The maximum differential input voltage is independent of thesupply voltages.However,neither of the input voltagesshould be allowed to exceed the negative supply as this willcause large currents to flow which can result in a destroyedunit.Exceeding the negative common-mode limit on either inputwill force the output to a high state,potentially causing areversal of phase to the output.Exceeding the negativecommon-mode limit on both inputs will force the amplifieroutput to a high state.In neither case does a latch occurLF3537Application Hints(Continued)sinceraising the input back within the common-mode range again puts the input stage and thus the amplifier in a normal operating mode.Exceeding the positive common-mode limit on a single input will not change the phase of the output;however,if both inputs exceed the limit,the output of the amplifier will be forced to a high state.The amplifiers will operate with a common-mode input volt-age equal to the positive supply;however,the gain band-width and slew rate may be decreased in this condition.When the negative common-mode voltage swings to within 3V of the negative supply,an increase in input offset voltage may occur.Each amplifier is individually biased by a zener reference which allows normal circuit operation on ±6V power sup-plies.Supply voltages less than these may result in lower gain bandwidth and slew rate.The amplifiers will drive a 2k Ωload resistance to ±10V over the full temperature range of 0˚C to +70˚C.If the amplifier is forced to drive heavier load currents,however,an increase in input offset voltage may occur on the negative voltage swing and finally reach an active current limit on both posi-tive and negative swings.Precautions should be taken to ensure that the power supply for the integrated circuit never becomes reversed in polarityor that the unit is not inadvertently installed backwards in a socket as an unlimited current surge through the resulting forward diode within the IC could cause fusing of the internal conductors and result in a destroyed unit.As with most amplifiers,care should be taken with lead dress,component placement and supply decoupling in order to ensure stability.For example,resistors from the output to an input should be placed with the body close to the input to minimize “pick-up”and maximize the frequency of the feed-back pole by minimizing the capacitance from the input to ground.A feedback pole is created when the feedback around any amplifier is resistive.The parallel resistance and capacitance from the input of the device (usually the inverting input)to AC ground set the frequency of the pole.In many instances the frequency of this pole is much greater than the expected 3dB frequency of the closed loop gain and consequently there is negligible effect on stability margin.However,if the feed-back pole is less than approximately 6times the expected 3dB frequency a lead capacitor should be placed from the output to the input of the op amp.The value of the added capacitor should be such that the RC time constant of this capacitor and the resistance it parallels is greater than or equal to the original feedback pole time constant.Detailed Schematic00564909L F 353 8Typical ApplicationsThree-Band Active Tone Control0056493900564940Note 1:All controls flat.Note 2:Bass and treble boost,mid flat.Note 3:Bass and treble cut,mid flat.Note 4:Mid boost,bass and treble flat.Note 5:Mid cut,bass and treble flat.•All potentiometers are linear taper•Use the LF347Quad for stereo applicationsLF3539Typical Applications(Continued)Improved CMRR Instrumentation Amplifier00564941Fourth Order Low Pass Butterworth Filter00564942L F 353 10Typical Applications (Continued)Fourth Order High Pass Butterworth Filter0056494311Typical Applications (Continued)Ohms to Volts Converter00564944L F 12Physical Dimensions inches (millimeters)unless otherwise notedOrder Number LF353M or LF353MXNS Package Number M08AMolded Dual-In-Line PackageOrder Number LF353NNS Package N08E13Notes LIFE 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 orsystems which,(a)are intended for surgical implantinto the body,or (b)support or sustain life,andwhose failure to perform when properly used inaccordance with instructions for use provided in thelabeling,can be reasonably expected to result in asignificant 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.BANNED SUBSTANCE COMPLIANCENational Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2)and the Banned Substances and Materials of Interest Specification (CSP-9-111S2)and contain no ‘‘Banned Substances’’as defined in CSP-9-111S2.National SemiconductorAmericas CustomerSupport CenterEmail:new.feedback@Tel:1-800-272-9959National Semiconductor Europe Customer Support Center Fax:+49(0)180-5308586Email:europe.support@ Deutsch Tel:+49(0)6995086208English Tel:+44(0)8702402171Français Tel:+33(0)141918790National Semiconductor Asia Pacific Customer Support Center Email:ap.support@ National Semiconductor Japan Customer Support Center Fax:81-3-5639-7507Email:jpn.feedback@ Tel: L F 353W i d e B a n d w i d t h D u a l J F E T I n p u t O p e r a t i o n a l A m p l i f i e r National 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.。