LME49721MA

LME49721 High Performance, High Fidelity Rail-to-Rail Input/Output Audio Operational Amplifier October 2007 LME49721 High Performance, High Fidelity Rail-to-Rail Input/Output Audio Operational Amplifier General Description The LME49721 is a low distortion, low noise Rail-to-Rail Input/ Output operational amplifier optimized and fully specified for high performance, high fidelity applications. Combining advanced leading-edge process technology with state-of-the-art circuit design, the LME49721 Rail-to-Rail Input/Output operational amplifier delivers superior signal amplification for outstanding performance. The LME49721 combines a very high slew rate with low THD+N to easily satisfy demanding applications. To ensure that the most challenging loads are driven without compromise, the LME49721 has a high slew rate of ±8.5V/μs and an output current capability of ±9.7mA. Further, dynamic range is maximized by an output stage that drives 10kΩ loads to within 10mV of either power supply voltage. The LME49721 has a wide supply range of 2.2V to 5.5V. Over this supply range the LME49721’s input circuitry maintains excellent common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49721 is unity gain stable. ■ Gain Bandwidth Product ■ Open Loop Gain (RL = 600Ω) ■ Input Bias Current ■ Input Offset Voltage ■ PSRR 20MHz (typ) 118dB (typ) 40fA (typ) 0.3mV (typ) 103dB (typ) Features ■ Rail-to-rail Input and Output ■ Easily drives 10kΩ loads to within 10mV of each power supply voltage ■ Optimized for superior audio signal fidelity ■ Output short circuit protection Applications ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Ultra high quality portable audio amplification High fidelity preamplifiers High fidelity multimedia State of the art phono pre amps High performance professional audio High fidelity equalization and crossover networks High performance line drivers High performance line receivers High fidelity active filters DAC I–V converter ADC front-end signal conditioning Key Specifications ■ Power Supply Voltage Range ■ Quiescent Current ■  THD+N (AV = 2, VOUT = 4Vp-p, fIN = 1kHz) RL = 2kΩ RL = 600Ω 0.00008% (typ) 0.0001% (typ) 4nV/√Hz (typ), @ 1kHz ±8.5V/μs (typ) 2.2V to 5.5V 2.15mA (typ) ■ Input Noise Density ■ Slew Rate Typical Connection, Pinout, and Package Marking 20204909 20204910 FIGURE 1. Buffer Amplifier Order Number LME49721MA Se NS Package Number M08A © 2007 National Semiconductor Corporation 202049 www.national.com LME49721 Package Marking 202049x1 NS = National Logo Z = Assembly plant code X = 1 Digit date code TT = Lot traceability L49721 = LME49721 MA = Narrow SOIC package code www.national.com 2 LME49721 Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Supply Voltage (VS = V+ - V-) Storage Temperature Input Voltage Output Short Circuit (Note 3) 6V −65°C to 150°C (V-) - 0.7V to (V+) + 0.7V Continuous Power Dissipation ESD Rating (Note 4) ESD Rating (Note 5) Junction Temperature Thermal Resistance  θJA (SO) Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage Range Internally Limited 2000V 200V 150°C 165°C/W –40°C ≤ TA ≤ 85°C 2.2V ≤ VS ≤ 5.5V Electrical Characteristics for the LME49721 Symbol Parameter The following specifications apply for the circuit shown in Figure 1. VS = 5V, RL = 10kΩ, RSOURCE = 10Ω, fIN = 1kHz, and TA = 25°C, unless otherwise specified. LME49721 Conditions AV = +1, VOUT = 2Vp-p, THD+N Total Harmonic Distortion + Noise RL = 2kΩ RL = 600Ω IMD GBWP SR FPBW Intermodulation Distortion Gain Bandwidth Product Slew Rate Full Power Bandwidth A V = +1 VOUT = 1VP-P, –3dB referenced to output magnitude at f = 1kHz AV = 1, 4V step 0.1% error range fBW = 20Hz to 20kHz, A-weighted f = 1kHz A-weighted f = 10kHz AV = +1, VOUT = 2Vp-p, Two-tone, 60Hz & 7kHz 4:1 0.0002 0.0002 0.0004 20 8.5 2.2 15 0.001 % (max) % MHz (min) V/μs (min) MHz Typical (Note 6) Limit (Note 7) Units (Limits) ts Settling time Equivalent Input Noise Voltage 800 .707 4 4.0 0.3 1.1 103 85 1.5 1.13 6 ns μVP-P (max) en Equivalent Input Noise Density Current Noise Density Offset Voltage  nV/√Hz (max) in VOS  fA/√Hz mV (max) μV/°C dB (min) dB fA fA/°C fA (V+) – 0.1 (V-) + 0.1 V (min) dB (min) Hz 100 dB (min) dB (min) 115 dB (min) Average Input Offset Voltage Drift vs ΔVOS/ΔTemp 40°C ≤ TA ≤ 85°C Temperature PSRR ISOCH-CH IB ΔIOS/ΔTemp IOS VIN-CM CMRR Average Input Offset Voltage Shift vs Power Supply Voltage Channel-to-Channel Isolation Input Bias Current Input Bias Current Drift vs Temperature Input Offset Current Common-Mode Input Voltage Range Common-Mode Rejection 1/f Corner Frequency VSS - 200mV < VOUT < VDD + 200mV AVOL Open Loop Voltage Gain RL = 600Ω RL = 2kΩ RL = 10kΩ VSS - 100mV < VCM < VDD + 100mV fIN = 1kHz VCM = VS/2 –40°C ≤ TA ≤ 85°C VCM = VS/2 117 40 48 60 93 2000 118 122 130 70 3 www.national.com LME49721 LME49721 Symbol Parameter Conditions Typical (Note 6) RL = 600Ω VOUTMIN Output Voltage Swing RL = 10kΩ, VS = 5.0V IOUT IOUT-SC ROUT IS Output Current Short Circuit Current Output Impedance Quiescent Current per Amplifier fIN = 10kHz Closed-Loop Open-Loop IOUT = 0mA RL = 250Ω, VS = 5.0V VDD – 30mV VSS + 30mV VDD – 10mV VSS + 10mV 9.7 100 0.01 46 2.15 3.25 Limit (Note 7) VDD – 80mV VSS + 80mV VDD – 20mV VSS + 20mV 9.3 Units (Limits) V (min) V (min) V (min) V (min) mA (min) mA Ω mA (max) Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the device should not be operated beyond such conditions. All voltages are measured with respect to the ground pin, unless otherwise specified Note 2: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed. Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower. Note 4: Human body model, applicable std. JESD22-A114C. Note 5: Machine model, applicable std. JESD22-A115-A. Note 6: Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of product characterization and are not guaranteed. Note 7: Datasheet min/max specification limits are guaranteed by test or statistical analysis. www.national.com 4 LME49721 Typical Performance Characteristics THD+N vs Frequency VS = ±2.5V, VOUT = 4VP-P RL = 2kΩ, AV = 2, BW = 22kHz Graphs were taken in dual supply configuration. THD+N vs Frequency VS = ±2.5V, VOUT = 4VP-P RL = 2kΩ, AV = 2 202049t6 202049t5 THD+N vs Frequency VS = ±2.5V, VOUT = 4VP-P RL = 10kΩ, AV = 2, BW = 22kHz THD+N vs Frequency VS = ±2.5V, VOUT = 4VP-P RL = 10kΩ, AV = 2 202049t8 202049t7 THD+N vs Frequency VS = ±2.5V, VOUT = 4VP-P RL = 600Ω, AV = 2, BW = 22kHz THD+N vs Frequency VS = ±2.5V, VOUT = 4VP-P RL = 600Ω, AV = 2 202049u0 202049t9 5 www.national.com LME49721 THD+N vs Frequency VS = ±2.75V, VOUT = 4VP-P RL = 2kΩ, AV = 2, BW = 22kHz THD+N vs Frequency VS = ±2.75V, VOUT = 4VP-P RL = 2kΩ, AV = 2 202049u2 202049u1 THD+N vs Frequency VS = ±2.75V, VOUT = 4VP-P RL = 10kΩ, AV = 2, BW = 22kHz THD+N vs Frequency VS = ±2.75V, VOUT = 4VP-P RL = 10kΩ, AV = 2 202049u4 202049u3 THD+N vs Frequency VS = ±2.75V, VOUT = 4VP-P RL = 600Ω, AV = 2, BW = 22kHz THD+N vs Frequency VS = ±2.75V, VOUT = 4VP-P RL = 600Ω, AV = 2 202049u5 202049u6 www.national.com 6 LME49721 THD+N vs Output Voltage VS = ±1.1V RL = 2kΩ, AV = 2 THD+N vs Output Voltage VS = ±1.1V RL = 10kΩ, AV = 2 202049u7 202049u8 THD+N vs Output Voltage VS = ±1.1V RL = 600Ω, AV = 2 THD+N vs Output Voltage VS = ±1.5V RL = 2kΩ, AV = 2 202049u9 202049v0 THD+N vs Output Voltage VS = ±1.5V RL = 10kΩ, AV = 2 THD+N vs Output Voltage VS = ±1.5V RL = 600Ω, AV = 2 202049v1 202049v2 7 www.national.com LME49721 THD+N vs Output Voltage VS = ±2.5V RL = 2kΩ, AV = 2 THD+N vs Output Voltage VS = ±2.5V RL = 10kΩ, AV = 2 202049v3 202049v4 THD+N vs Output Voltage VS = ±2.5V RL = 600Ω, AV = 2 THD+N vs Output Voltage VS = ±2.75V RL = 2kΩ, AV = 2 202049v5 202049v6 THD+N vs Output Voltage VS = ±2.75V RL = 10kΩ, AV = 2 THD+N vs Output Voltage VS = ±2.75V RL = 600Ω, AV = 2 202049v7 202049v8 www.national.com 8 LME49721 Crosstalk vs Frequency VS = ±1.1V VOUT = 2Vp-p RL = 2kΩ Crosstalk vs Frequency VS = ±1.1V VOUT = 2Vp-p RL = 10kΩ 202049r4 202049r5 Crosstalk vs Frequency VS = ±1.1V VOUT = 2Vp-p RL = 600Ω Crosstalk vs Frequency VS = ±1.5V, VOUT = 2Vp-p RL = 2kΩ 202049r6 202049k1 Crosstalk vs Frequency VS = ±1.5V VOUT = 2Vp-p RL = 10kΩ Crosstalk vs Frequency VS = ±1.5V VOUT = 2Vp-p RL = 600Ω 202049k2 202049k3 9 www.national.com LME49721 Crosstalk vs Frequency VS = ±2.5V VOUT = 4Vp-p RL = 2kΩ Crosstalk vs Frequency VS = ±2.5V VOUT = 4Vp-p RL = 10kΩ 202049k4 202049k5 Crosstalk vs Frequency VS = ±2.5V VOUT = 4Vp-p RL = 600Ω Crosstalk vs Frequency VS = ±2.75V VOUT = 4Vp-p RL = 2kΩ 202049k6 202049k7 Crosstalk vs Frequency VS = ±2.75V VOUT = 4Vp-p RL = 10kΩ Crosstalk vs Frequency VS = ±2.75V VOUT = 4Vp-p RL = 600Ω 202049k8 202049k9 www.national.com 10 LME49721 PSRR vs Frequency VS = ±1.1V VRIPPLE = 200mVP-P RL = 2kΩ PSRR vs Frequency VS = ±1.1V VRIPPLE = 200mVP-P RL = 10kΩ 202049v9 202049w0 PSRR vs Frequency VS = ±1.1V VRIPPLE = 200mVP-P RL = 600Ω PSRR vs Frequency VS = ±1.5V VRIPPLE = 200mVP-P RL = 2kΩ 202049w1 202049w2 PSRR vs Frequency VS = ±1.5V VRIPPLE = 200mVP-P RL = 10kΩ PSRR vs Frequency VS = ±1.5V VRIPPLE = 200mVP-P RL = 600Ω 202049w3 202049x4 11 www.national.com LME49721 PSRR vs Frequency VS = ±2.5V VRIPPLE = 200mVP-P RL = 2kΩ PSRR vs Frequency VS = ±2.5V VRIPPLE = 200mVP-P RL = 10kΩ 202049w5 202049w6 PSRR vs Frequency VS = ±2.5V VRIPPLE = 200mVP-P RL = 600Ω PSRR vs Frequency VS = ±2.75V VRIPPLE = 200mVP-P RL = 2kΩ 202049w7 202049w8 PSRR vs Frequency VS = ±2.75V VRIPPLE = 200mVP-P RL = 10kΩ PSRR vs Frequency VS = ±2.75V VRIPPLE = 200mVP-P RL = 600Ω 202049w9 202049x0 www.national.com 12 LME49721 CMRR vs Frequency VS = ±1.5V RL = 2kΩ CMRR vs Frequency VS = ±1.5V RL = 10kΩ 202049l3 202049l4 CMRR vs Frequency VS = ±1.5V RL = 600Ω CMRR vs Frequency VS = ±2.5V RL = 2kΩ 202049l5 202049l6 CMRR vs Frequency VS = ±2.5V RL = 10kΩ CMRR vs Frequency VS = ±2.5V RL = 600Ω 202049l7 202049l8 13 www.national.com LME49721 CMRR vs Frequency VS = ±2.75V RL = 2kΩ CMRR vs Frequency VS = ±2.75V RL = 10kΩ 202049l9 202049m0 CMRR vs Frequency VS = ±2.75V RL = 600Ω Output Voltage Swing Neg vs Power Supply RL = 2kΩ 202049s9 202049m1 Output Voltage Swing Neg vs Power Supply RL = 10kΩ Output Voltage Swing Neg vs Power Supply RL = 600Ω 202049t0 202049t1 www.national.com 14 LME49721 Output Voltage Swing Pos vs Power Supply RL = 2kΩ Output Voltage Swing Pos vs Power Supply RL = 10kΩ 202049t2 202049t3 Output Voltage Swing Pos vs Power Supply RL = 600Ω Supply Current per amplifier vs Power Supply RL = 2kΩ, Dual Supply 202049t4 20204953 Supply Current per amplifier vs Power Supply RL = 10kΩ, Dual Supply Supply Current per amplifier vs Power Supply RL = 600Ω, Dual Supply 20204954 20204956 15 www.national.com LME49721 Application Information DISTORTION MEASUREMENTS The vanishingly low residual distortion produced by LME49721 is below the capabilities of all commercially available equipment. This makes distortion measurements just slightly more difficult than simply connecting a distortion meter to the amplifier's inputs and outputs. The solution. however, is quite simple: an additional resistor. Adding this resistor extends the resolution of the distortion measurement equipment. The LME49721's low residual is an input referred internal error. As shown in Figure 1, adding the 10Ω resistor connected between athe amplifier's inverting and non-inverting inputs changes the amplifier's noise gain. The result is that the error signal (distortion) is amplified by a factor of 101. Although the amplifier's closed-loop gain is unaltered, the feedback available to correct distortion errors is reduced by 101. To ensure minimum effects on distortion measurements, keep the value of R1 low as shown in Figure 1. This technique is verified by duplicating the measurements with high closed loop gain and/or making the measurements at high frequencies. Doing so, produces distortion components that are within equipments capabilities. This datasheet's THD+N and IMD values were generated using the above described circuit connected to an Audio Precision System Two Cascade. 202049x2 FIGURE 1. THD+N and IMD Distortion Test Circuit with AV = 2 OPERATING RATINGS AND BASIC DESIGN GUIDELINES The LME49721 has a supply voltage range from +2.2V to +5.5V single supply or ±1.1 to ±2.75V dual supply. Bypassed capacitors for the supplies should be placed as close to the amplifier as possible. This will help minimize any inductance between the power supply and the supply pins. In addition to a 10μF capacitor, a 0.1μF capacitor is also recommended in CMOS amplifiers. The amplifier's inputs lead lengths should also be as short as possible. If the op amp does not have a bypass capacitor, it may oscillate. BASIC AMPLIFIER CONFIGURATIONS The LME49721 may be operated with either a single supply or dual supplies. Figure 2 shows the typical connection for a single supply inverting amplifier. The output voltage for a single supply amplifier will be centered around the commonmode voltage Vcm. Note, the voltage applied to the Vcm insures the output stays above ground. Typically, the Vcm 202049n3 should be equal to VDD/2. This is done by putting a resistor divider ckt at this node, see Figure 2. FIGURE 2. Single Supply Inverting Op Amp www.national.com 16 LME49721 Figure 3 shows the typical connection for a dual supply inverting amplifier. The output voltage is centered on zero. er consumption in the source, or to drive heavy loads. The input impedance of the op amp is very high. Therefore, the input of the op amp does not load down the source. The output impedance on the other hand is very low. It allows the load to either supply or absorb energy to a circuit while a secondary voltage source dissipates energy from a circuit. The Buffer is a unity stable amplifier, 1V/V. Although the feedback loop is tied from the output of the amplifier to the inverting input, the gain is still positive. Note, if a positive feedback is used, the amplifier will most likely drive to either rail at the output. 202049n2 FIGURE 3. Dual Supply Inverting Op Amp Figure 4 shows the typical connection for the Buffer Amplifier or also called a Voltage Follower. A Buffer Amplifier can be used to solve impedance matching problems, to reduce pow202049n1 FIGURE 4. Buffer 17 www.national.com LME49721 Typical Applications ANAB Preamp NAB Preamp Voltage Gain vs Frequency 202049n5 202049n4 AV = 34.5 F = 1 kHz En = 0.38 μV A Weighted Balanced to Single Ended Converter Adder/Subtracter 202049n7 VO = V1 + V2 − V3 − V4 202049n6 VO = V1–V2 Sine Wave Oscillator 202049n8 www.national.com 18 LME49721 Second Order High Pass Filter (Butterworth) Second Order Low Pass Filter (Butterworth) 202049n9 202049o0 Illustration is f0 = 1 kHz Illustration is f0 = 1 kHz State Variable Filter 202049o1 Illustration is f0 = 1 kHz, Q = 10, ABP = 1 19 www.national.com LME49721 AC/DC Converter 202049o2 2 Channel Panning Circuit (Pan Pot) Line Driver 202049o3 202049o4 www.national.com 20 LME49721 Tone Control 202049o5 Illustration is: fL = 32 Hz, fLB = 320 Hz fH =11 kHz, fHB = 1.1 kHz 202049o6 RIAA Preamp 202049o8 Av = 35 dB En = 0.33 μV S/N = 90 dB f = 1 kHz A Weighted A Weighted, VIN = 10 mV @f = 1 kHz 21 www.national.com LME49721 Balanced Input Mic Amp 202049o7 Illustration is: V0 = 101(V2 − V1) www.national.com 22 LME49721 10 Band Graphic Equalizer 202049p0 fo (Hz) 32 64 125 250 500 1k 2k 4k 8k 16k Note 8: At volume of change = ±12 dB C1 0.12μF 0.056μF 0.033μF 0.015μF 8200pF 3900pF 2000pF 1100pF 510pF 330pF C2 4.7μF 3.3μF 1.5μF 0.82μF 0.39μF 0.22μF 0.1μF 0.056μF 0.022μF 0.012μF R1 75kΩ 68kΩ 62kΩ 68kΩ 62kΩ 68kΩ 68kΩ 62kΩ 68kΩ 51kΩ R2 500Ω 510Ω 510Ω 470Ω 470Ω 470Ω 470Ω 470Ω 510Ω 510Ω   Q = 1.7   Reference: “AUDIO/RADIO HANDBOOK”, National Semiconductor, 1980, Page 2–61 23 www.national.com LME49721 Revision History Rev 1.0 1.1 Date 09/26/07 10/01/07 Description Initial release. Input more info under the Buffer Amplifier. www.national.com 24 LME49721 Physical Dimensions inches (millimeters) unless otherwise noted NS Package M08A 25 www.national.com LME49721 High Performance, High Fidelity Rail-to-Rail Input/Output Audio Operational Amplifier Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. 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All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright© 2007 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530-85-86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +49 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com