LMV771/LMV772/LMV774 Single/Dual/Quad, Low Offset,
LMV771/LMV772/LMV774Single/Dual/Quad, Low Offset, Low Noise, RROOperational AmplifiersGeneral DescriptionFeaturesThe LMV771/LMV772/LMV774 are Single, Dual, and Quadlow noise precision operational amplifiers intended for use ina wide range of applications. Other important characteristicsof the family include extended operating temperature range, 40 C to 125 C, tiny SC70-5 package for LMV771, and lowinput bias current.(Typical 2.7V Supply Values; Unless Otherwise Noted)n Guaranteed 2.7V and 5V specificationsn Maximum VOS (LMV771)850µV (limit)n Voltage Noise— f 100Hz12.5nV/— f 10kHz7.5nV/n Rail-to-Rail output swing— w/600Ω load100mV from rail— w/2kΩ load50mV from railn Open loop gain w/2kΩ load100dBn VCM0 to V -0.9Vn Supply current (per amplifier)550µAn Gain bandwidth product3.5MHzn Temperature range 40 C to 125 CThe extended temperature range of 40 C to 125 C allowsthe LMV771/LMV772/LMV774 to accommodate a broadrange of applications. LMV771 expands National Semiconductor’s Silicon Dust amplifier portfolio offering enhancements in size, speed, and power savings. The LMV771/LMV772/LMV774 are guaranteed to operate over thevoltage range of 2.7V to 5.0V and all have rail-to-rail output.The LMV771/LMV772/LMV774 family is designed for precision, low noise, low voltage, and miniature systems. Theseamplifiers provide rail-to-rail output swing into heavy loads.The maximum input offset voltage for LMV771 is 850 µV atroom temperature and the input common mode voltagerange includes ground.The LMV771 is offered in the tiny SC70-5 package, LMV772in space saving MSOP-8 and SOIC-8, and the LMV774 inTSSOP-14.Connection DiagramApplicationsnnnnnnnTransducer amplifierInstrumentation amplifierPrecision current sensingData acquisition systemsActive filters and buffersSample and holdPortable/battery powered electronicsInstrumentation AmplifierSC70-520039667Top View 2003 National Semiconductor LMV772/LMV774 Single/Dual/Quad, Low Offset, Low Noise, RRO Operational AmplifiersNovember 2003
LMV771/LMV772/LMV774Absolute Maximum RatingsStorage Temperature Range(Note 1)Junction Temperature (Note 5)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.Supply Voltage200VHuman Body Model Supply Voltage (V –V ) 40 C to 125 CThermal Resistance (θJA) Supply Voltage 2.7V to 5.5VTemperature Range2000VDifferential Input Voltage150 COperating Ratings (Note 1)ESD Tolerance (Note 2)Machine Model 65 C to 150 CSC70-5 Package5.5V440 C/WOutput Short Circuit to V (Note 3)8-Pin MSOPOutput Short Circuit to V (Note 4)8-Pin SOIC190 C/W14-Pin TSSOP155 C/WMounting TempertureInfrared or Convection (20 sec)235 CWave Soldering Lead Temp (10sec)260 C235 C/W2.7V DC Electrical Characteristics(Note 13)Unless otherwise specified, all limits guaranteed for TJ 25 C. V 2.7V, VRL 1MΩ. Boldface limits apply at the temperature extremes.SymbolVOSParameterInput Offset VoltageCondition 0V, VCM V /2, VO V /2 andMin(Note 7)Typ(Note 6)Max(Note ut Offset Voltage AverageDriftIBInput Bias Current (Note 8) 0.1100pAIOSInput Offset Current (Note 8)0.004100pAISSupply Current (Per Amplifier)550900910µACMRRCommon Mode Rejection Ratio0.5 VCM 1.2V747280PSSRPower Supply Rejection Ratio2.7V V 5V827690VCMInput Common-Mode VoltageRangeFor CMRR 50dB0AVLarge Signal Voltage Gain(Note 9)RL 600Ω to 1.35V,VO 0.2V to 2.5V, (Note 10)9280100RL 2kΩ to 1.35V,VO 0.2V to 2.5V, (Note 11)9886100RL 600Ω to 1.35VVIN 100mV, (Note 10)0.110.140.084 to2.622.592.56RL 2kΩ to 1.35VVIN 100mV, (Note 11)0.050.060.026 to2.682.652.64Sourcing, VO 0VVIN 100mV181124Sinking, VO 2.7VVIN 100mV181122VOIOOutput SwingOutput Short Circuit Currentwww.national.com 0.45Units2µV/ CdBdB1.8VdBVmA
(Note 13)Unless otherwise specified, all limits guaranteed for TJ 25 C. V 5.0V, VBoldface limits apply at the temperature extremes.SymbolParameter Conditions 0V, VCM V /2, VO V /2 and RL 1MΩ.Min(Note 7)(Note 12)Typ(Note 6)Max(Note 7)UnitsSRSlew Rate1.4V/µsGBWGain-Bandwidth Product3.5MHzΦmPhase Margin79DegGmGain MarginenInput-Referred Voltage Noise(Flatband)f 10kHz7.5nV/enInput-Referred Voltage Noise(l/f)f 100Hz12.5nV/inInput-Referred Current Noisef 1kHz0.001pA/THDTotal Harmonic Distortionf 1kHz, AV 1RL 600Ω, VIN 1 VPP0.007 15dB%5.0V DC Electrical Characteristics(Note 13)Unless otherwise specified, all limits guaranteed for TJ 25 C. V 5.0V, VRL 1MΩ. Boldface limits apply at the temperature extremes.SymbolVOSParameterInput Offset VoltageCondition 0V, VCM V /2, VO V /2 andMin(Note 7)Typ(Note 6)Max(Note CVOSInput Offset Voltage AverageDrift 0.35IBInput Bias Current (Note 8) 0.23100pAIOSInput Offset Current (Note 8)0.017100pAISSupply Current (Per Amplifier)600950960µACMRRCommon Mode Rejection Ratio0.5 VCM 3.5V807990PSRRPower Supply Rejection Ratio2.7V V 5V827690VCMInput Common-Mode VoltageRangeFor CMRR 50dB0AVLarge Signal Voltage Gain(Note 9)RL 600Ω to 2.5V,VO 0.2V to 4.8V, (Note 10)9289100RL 2kΩ to 2.5V,VO 0.2V to 4.8V, (Note 11)9895100RL 600Ω to 2.5VVIN 100mV, (Note 10)0.150.230.112 to4.94.854.77RL 2kΩ to 2.5VVIN 100mV, (Note 11)0.060.070.035 to4.974.944.93Sourcing, VO 0VVIN 100mV353575Sinking, VO 2.7VVIN 100mV353566VOIOOutput SwingOutput Short Circuit Current(Note 8),(Note 14)3µV/ 2.7V AC Electrical Characteristics
LMV771/LMV772/LMV7745.0V AC Electrical Characteristics(Note 13)Unless otherwise specified, all limits guaranteed for TJ 25 C. V 5.0V, VBoldface limits apply at the temperature extremes.SymbolParameterConditions(Note 12) 0V, VCM V /2, VO V /2 and RL 1MΩ.Min(Note 7)Typ(Note 6)Max(Note 7)UnitsSRSlew Rate1.4V/µsGBWGain-Bandwidth Product3.5MHzΦmPhase Margin79DegGmGain MarginenInput-Referred Voltage Noise(Flatband)f 10kHz6.5nV/enInput-Referred Voltage Noise(l/f)f 100Hz12nV/pA/ 15inInput-Referred Current Noisef 1kHz0.001THDTotal Harmonic Distortionf 1kHz, AV 1RL 600Ω, VIN 1 VPP0.007dB%Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device isintended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.Note 2: Human body model, 1.5kΩ in series with 100pF. Machine model, 0Ω in series with 20pF.Note 3: Shorting output to V will adversely affect reliability.Note 4: Shorting output to V will adversely affect reliability.Note 5: The maximum power dissipation is a function of TJ(MAX) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature isPD (TJ(MAX)–T A)/θJA. All numbers apply for packages soldered directly into a PC board.Note 6: Typical Values represent the most likely parametric norm.Note 7: All limits are guaranteed by testing or statistical analysis.Note 8: Limits guaranteed by design.Note 9: RL is connected to mid-supply. The output voltage is set at 200mV from the rails. VO GND 0.2V and VO V 0.2VNote 10: For LMV772/LMV774, temperature limits apply to 40 C to 85 C.Note 11: For LMV772/LMV774, temperature limits apply to 40 C to 85 C. If RL is relaxed to 10kΩ, then for LMV772/LMV774 temperature limits apply to 40 C to125 C.Note 12: Connected as voltage follower with 2VPP step input. Number specified is the slower of positive and negative slew rates.Note 13: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heatingof the device such that TJ TA . No guarantee of parametric performance is indicated in the electrical tables under the conditions of internal self-heating where TJ TA. Absolute Maximum Rating indicated junction temperature limits beyond which the device may be permanently degraded, either mechanically or electrically.Note 14: Continuous operation of the device with an output short circuit current larger than 35mA may cause permanent damage to the device.www.national.com4
PackagePart NumberLMV771MGSC70-5LMV771MGXLMV772MA8-Pin SOICLMV772MAXLMV772MM8-Pin MSOPLMV772MMXLMV774MT14-Pin TSSOPLMV774MTXPackage MarkingA75LMV772MAA91ALMV774MTTransport MediaNSC Drawing1k Units Tape and Reel3k Units Tape and Reel95 Units/Rail2.5k Units Tape and Reel1k Units Tape and Reel3.5k Units Tape and Reel95 Units/Rail2.5k Units Tape and ReelMAA05AM08AMUA08AMTC14Connection DiagramsSC70-58-Pin MSOP/SOIC20039667Top View14-Pin TSSOP20039671Top View520039672Top Viewwww.national.comLMV771/LMV772/LMV774Ordering Information
LMV771/LMV772/LMV774Typical Performance CharacteristicsVOS vs. VCM Over TemperatureVOS vs. VCM Over Temperature2003962620039627Output Swing vs. VSOutput Swing vs. VS2003962520039624Output Swing vs. VSIS vs. VS Over Temperature2003963020039623www.national.com6
LMV771/LMV772/LMV774Typical Performance Characteristics(Continued)VIN vs. VOUTVIN vs. VOUT2003962820039629Sourcing Current vs. VOUT (Note 14)Sourcing Current vs. VOUT (Note 14)2003963120039664Sinking Current vs. VOUT (Note 14)Sinking Current vs. VOUT (Note 14)20039632200396637www.national.com
LMV771/LMV772/LMV774Typical Performance Characteristics(Continued)Input Voltage Noise vs. FrequencyInput Bias Current Over Temperature2003960820039635Input Bias Current Over TemperatureInput Bias Current Over Temperature2003963420039633THD N vs. FrequencyTHD N vs. VOUT20039607www.national.com200396668
(Continued)Slew Rate vs. Supply VoltageOpen Loop Frequency Response Over Temperature2003960120039602Open Loop Frequency ResponseOpen Loop Frequency Response2003960320039604Open Loop Gain & Phase with Cap. LoadingOpen Loop Gain & Phase with Cap. 772/LMV774Typical Performance Characteristics
LMV771/LMV772/LMV774Typical Performance Characteristics(Continued)Non-Inverting Small Signal Pulse ResponseNon-Inverting Large Signal Pulse Response2003961720039611Non-Inverting Small Signal Pulse ResponseNon-Inverting Large Signal Pulse Response2003961020039616Non-Inverting Small Signal Pulse ResponseNon-Inverting Large Signal Pulse Response20039615www.national.com2003960910
(Continued)Inverting Small Signal Pulse ResponseInverting Large Signal Pulse Response2003961920039614Inverting Small Signal Pulse ResponseInverting Large Signal Pulse Response2003962020039613Inverting Small Signal Pulse ResponseInverting Large Signal Pulse MV772/LMV774Typical Performance Characteristics
LMV771/LMV772/LMV774Typical Performance Characteristics(Continued)Stability vs. VCMStability vs. VCM2003962120039622PSRR vs. FrequencyCMRR vs. Frequency2003966520039668Crosstalk Rejection vs. Frequency20039694www.national.com12
LMV771/LMV772/LMV774The LMV771/LMV772/LMV774 is a family of precision amplifiers with very low noise and ultra low offset voltage.LMV771/LMV772/LMV774’s extended temperature range of 40 C to 125 C enables the user to design this family ofproducts in a variety of applications including automotive.(1)By Ohm’s Law:LMV771 has a maximum offset voltage of 1mV over theextended temperature range. This makes LMV771 ideal forapplications where precision is of importance.LMV772/LMV774 have a maximum offset voltage of 1mV atroom temperature and 1.2mV over the extended temperature range of 40 C to 125 C. Care must be given whenLMV772/LMV774 are designed in applications with heavyloads under extreme temperature conditions. As indicated inthe DC tables, the LMV772/LMV774’s gain and output swingmay be reduced at temperatures between 85 C and 125 Cwith loads heavier than 2kΩ.(2)However:INSTRUMENTATION AMPLIFIER(3)Measurement of very small signals with an amplifier requiresclose attention to the input impedance of the amplifier, gainof the overall signal on the inputs, and the gain on each inputsince we are only interested in the difference of the twoinputs and the common signal is considered noise. A classicsolution is an instrumentation amplifier. Instrumentation amplifiers have a finite, accurate, and stable gain. Also theyhave extremely high input impedances and very low outputimpedances. Finally they have an extremely high CMRR sothat the amplifier can only respond to the differential signal.A typical instrumentation amplifier is shown in Figure 1.So we have:(4)Now looking at the output of the instrumentation amplifier:(5)Substituting from equation 4:(6)This shows the gain of the instrumentation amplifier to be: K(2a 1)Typical values for this circuit can be obtained by setting: a 12 and K 4. This results in an overall gain of 100.Figure 2 shows typical CMRR characteristics of this Instrumentation amplifier over frequency. Three LMV771 amplifiers are used along with 1%resistors to minimize resistormismatch. Resistors used to build the circuit are: R1 21.6kΩ, R11 1.8kΩ, R2 2.5kΩ with K 40 and a 12.This results in an overall gain of 1000, K(2a 1) 1000.20039636FIGURE 1.There are two stages in this amplifier. The last stage, outputstage, is a differential amplifier. In an ideal case the twoamplifiers of the first stage, input stage, would be set up asbuffers to isolate the inputs. However they cannot be connected as followers because of real amplifiers mismatch.That is why there is a balancing resistor between the two.The product of the two stages of the gain will give the gain ofthe instrumentation amplifier. Ideally, the CMRR should beinfinity. However the output stage has a small non-zerocommon mode gain which results from resistor mismatch.13www.national.comLMV771/LMV772/LMV774In the input stage of the circuit, current is the same across allresistors. This is due to the high input impedance and lowinput bias current of the LMV771. With the node equationswe have:Application Note
LMV771/LMV772/LMV774Application NoteSimplifying this further results in:(Continued)(8)or(9)Now, substituting ω 2πf, so that the calculations are in f(Hz)andand not ω(rad/s), and setting the DC gain(10)Set:20039673FIGURE 2. CMRR vs. Frequency(11)Low pass filters are known as lossy integrators because theyonly behave as an integrator at higher frequencies. Just bylooking at the transfer function one can predict the generalform of the bode plot. When the f/fO ratio is small, thecapacitor is in effect an open circuit and the amplifier behaves at a set DC gain. Starting at fO, 3dB corner, thecapacitor will have the dominant impedance and hence thecircuit will behave as an integrator and the signal will beattenuated and eventually cut. The bode plot for this filter isshown in the following picture:ACTIVE FILTERActive Filters are circuits with amplifiers, resistors, and capacitors. The use of amplifiers instead of inductors, whichare used in passive filters, enhances the circuit performancewhile reducing the size and complexity of the filter.The simplest active filters are designed using an inverting opamp configuration where at least one reactive element hasbeen added to the configuration. This means that the op ampwill provide "frequency-dependent" amplification, since reactive elements are frequency dependent devices.LOW PASS FILTERThe following shows a very simple low pass filter.2003964720039653FIGURE 3.FIGURE 4.The transfer function can be expressed as follows:By KCL:(7)www.national.com14
LMV771/LMV772/LMV774Application Note(Continued)HIGH PASS FILTERIn a similar approach, one can derive the transfer function ofa high pass filter. A typical first order high pass filter is shownbelow:2003965820039654FIGURE 6.FIGURE 5.BAND PASS FILTERWriting the KCL for this circuit :(V1 denotes the voltage between C and R1)(12)(13)Solving these two equations to find the transfer function andusing:20039660FIGURE 7.(high frequency gain)Combining a low pass filter and a high pass filter will generate a band pass filter. In this network the input impedanceforms the high pass filter while the feedback impedanceforms the low pass filter. Choosing the corner frequencies sothat f1 f2, then all the frequencies in between, f1 f f2, willpass through the filter while frequencies below f1 and abovef2 will be cut off.The transfer function can be easily calculated using thesame methodology as before.andWhich results:(14)Looking at the transfer function, it is clear that when f/fO issmall, the capacitor is open and hence no signal is getting into the amplifier. As the frequency increases the amplifierstarts operating. At f fO the capacitor behaves like a shortcircuit and the amplifier will have a constant, high frequency,gain of HO. The bode plot of the transfer function follows:(15)WhereThe transfer function is presented in the following figure.15www.national.com
LMV771/LMV772/LMV774Application NoteSTATE VARIABLE ACTIVE FILTERState variable active filters are circuits that can simultaneously represent high pass, band pass, and low pass filters. The state variable active filter uses three separateamplifiers to achieve this task. A typical state variable activefilter is shown in Figure 9. The first amplifier in the circuit isconnected as a gain stage. The second and third amplifiersare connected as integrators, which means they behave aslow pass filters. The feedback path from the output of thethird amplifier to the first amplifier enables this low frequencysignal to be fed back with a finite and fairly low closed loopgain. This is while the high frequency signal on the input isstill gained up by the open loop gain of the 1st amplifier. Thismakes the first amplifier a high pass filter. The high passsignal is then fed in to a low pass filter. The outcome is aband pass signal, meaning the second amplifier is a bandpass filter. This signal is then fed into the third amplifiersinput and so the third amplifier behaves as a simple low passfilter.(Continued)20039662FIGURE 8.20039674FIGURE 9.The transfer function of each filter needs to be calculated.The derivations will be more trivial if each stage of the filter isshown on its own.The three components are:2003968020039681For A1 the relationship between input and output is:www.national.com16
A design example is shown here:(Continued)Designing a bandpass filter with center frequency of 10kHzand Quality factor of 5.5To do this, first consider the quality factor. It is best to pickconvenient values for the capacitors. C2 C3 1000pF.Also, choose R1 R4 30kΩ. Now Values of R5 and R6need to be calculated. With the chosen values for the capacitors and resistors, Q reduces to:This relationship depends on the output of all the filters. Theinput-output relationship for A2 can be expressed as:And finally this relationship for A3 is as follows:orRe-arranging these equations, one can find the relationshipbetween VO and VIN (transfer function of the lowpass filter),VO1 and VIN (transfer function of the highpass filter), and VO2and VIN (transfer function of the bandpass filter) These relationships are as follows:R5 10R6R6 1.5kΩR5 15kΩAlso, for f 10kHz, value of center frequency is ωc 2πf 62.8kHz.Lowpass filterUsing the expressions above, the appropriate resistor valueswill be R2 R3 16kΩ.The following graphs show the transfer function of each ofthe filters. The DC gain of this circuit is:20039690The following graphics show the frequency response of eachof the stages when using LMV774 as the amplifier:Highpass filterBandpass FilterThe center frequency and quality factor for all of these filtersis the same. The values can be calculated in the followingmanner:20039691FIGURE 10. Lowpass Filter Frequency ication Note
LMV771/LMV772/LMV774Application Note(Continued)20039692FIGURE 11. Bandpass Filter Frequency Respo
Single/Dual/Quad, Low Offset, Low Noise, RRO Operational Amplifiers General Description The LMV771/LMV772/LMV774 are Single, Dual, and Quad low noise precision operational amplifiers intended for use in a wide range of applications. Other important characteristics of
LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004– REVISED SEPTEMBER 2010 Absolute Maximum Ratings (1) ES
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