LME49721 High Performance, High Fidelity Rail-to-Rail Input/Output Audio Operational Amplifier General Description ■ Gain Bandwidth Product 20MHz (typ) 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. ■ Open Loop Gain (RL = 600Ω) 118dB (typ) Key Specifications ■ Power Supply Voltage Range 2.2V to 5.5V ■ Quiescent Current 2.15mA (typ) ■ THD+N (AV = 2, VOUT = 4Vp-p, fIN = 1kHz) RL = 2kΩ 0.00008% (typ) RL = 600Ω 0.0001% (typ) ■ Input Noise Density ■ Slew Rate 4nV/√Hz (typ), @ 1kHz ■ Input Bias Current 40fA (typ) ■ Input Offset Voltage 0.3mV (typ) ■ PSRR 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 ±8.5V/μs (typ) Typical Connection, Pinout, and Package Marking 20204909 FIGURE 1. Buffer Amplifier © 2007 National Semiconductor Corporation 202049 20204910 Order Number LME49721MA Se NS Package Number M08A www.national.com LME49721 High Performance, High Fidelity Rail-to-Rail Input/Output Audio Operational Amplifier October 2007 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 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 θJA (SO) Temperature Range 6V −65°C to 150°C Output Short Circuit (Note 3) Internally Limited 2000V 200V 150°C 165°C/W TMIN ≤ TA ≤ TMAX Supply Voltage Range (V-) - 0.7V to (V+) + 0.7V Continuous –40°C ≤ TA ≤ 85°C 2.2V ≤ VS ≤ 5.5V Electrical Characteristics for the LME49721 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 Symbol Parameter Conditions Typical Limit (Note 6) (Note 7) 0.0002 0.0002 0.001 Units (Limits) AV = +1, VOUT = 2Vp-p, THD+N Total Harmonic Distortion + Noise RL = 2kΩ RL = 600Ω AV = +1, VOUT = 2Vp-p, Two-tone, 60Hz & 7kHz 4:1 IMD Intermodulation Distortion GBWP Gain Bandwidth Product SR Slew Rate AV = +1 8.5 V/μs (min) FPBW Full Power Bandwidth VOUT = 1VP-P, –3dB referenced to output magnitude at f = 1kHz 2.2 MHz ts Settling time AV = 1, 4V step 0.1% error range 800 ns Equivalent Input Noise Voltage en 0.0004 % (max) 20 fBW = 20Hz to 20kHz, A-weighted Equivalent Input Noise Density f = 1kHz A-weighted in Current Noise Density f = 10kHz VOS Offset Voltage .707 % 15 1.13 MHz (min) μVP-P (max) 4 6 nV/√Hz (max) fA/√Hz 4.0 0.3 Average Input Offset Voltage Drift vs ΔVOS/ΔTemp 40°C ≤ TA ≤ 85°C Temperature 1.5 mV (max) μV/°C 1.1 PSRR Average Input Offset Voltage Shift vs Power Supply Voltage ISOCH-CH Channel-to-Channel Isolation fIN = 1kHz 117 dB IB Input Bias Current VCM = VS/2 40 fA ΔIOS/ΔTemp Input Bias Current Drift vs Temperature –40°C ≤ TA ≤ 85°C 48 fA/°C IOS Input Offset Current VCM = VS/2 60 VIN-CM CMRR 103 Common-Mode Input Voltage Range Common-Mode Rejection VSS - 100mV < VCM < VDD + 100mV 1/f Corner Frequency 93 85 dB (min) fA (V+) – 0.1 (V-) + 0.1 V (min) 70 dB (min) 2000 Hz VSS - 200mV < VOUT < VDD + 200mV AVOL Open Loop Voltage Gain RL = 600Ω 118 RL = 2kΩ 122 RL = 10kΩ 130 3 100 dB (min) dB (min) 115 dB (min) www.national.com LME49721 Power Dissipation ESD Rating (Note 4) ESD Rating (Note 5) Junction Temperature Thermal Resistance Absolute Maximum Ratings (Notes 1, 2) LME49721 LME49721 Symbol Parameter Conditions RL = 600Ω VOUTMIN Output Voltage Swing RL = 10kΩ, VS = 5.0V IOUT Output Current IOUT-SC Short Circuit Current RL = 250Ω, VS = 5.0V ROUT Output Impedance fIN = 10kHz Closed-Loop Open-Loop IS Quiescent Current per Amplifier IOUT = 0mA Typical Limit Units (Limits) (Note 6) (Note 7) VDD – 30mV VDD – 80mV V (min) VSS + 30mV VSS + 80mV V (min) VDD – 10mV VDD – 20mV V (min) VSS + 10mV VSS + 20mV V (min) 9.7 9.3 mA (min) 100 mA 0.01 46 Ω 2.15 3.25 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 Graphs were taken in dual supply configuration. THD+N vs Frequency VS = ±2.5V, VOUT = 4VP-P RL = 2kΩ, AV = 2, BW = 22kHz 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 202049u1 202049u2 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 202049u6 202049u5 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 www.national.com 202049v8 8 LME49721 Crosstalk vs Frequency VS = ±1.1V VOUT = 2Vp-p RL = 10kΩ Crosstalk vs Frequency VS = ±1.1V VOUT = 2Vp-p RL = 2kΩ 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 = 10kΩ Crosstalk vs Frequency VS = ±2.5V VOUT = 4Vp-p RL = 2kΩ 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 www.national.com 202049k9 10 LME49721 PSRR vs Frequency VS = ±1.1V VRIPPLE = 200mVP-P RL = 10kΩ PSRR vs Frequency VS = ±1.1V VRIPPLE = 200mVP-P RL = 2kΩ 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 = 10kΩ PSRR vs Frequency VS = ±2.5V VRIPPLE = 200mVP-P RL = 2kΩ 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 202049x0 202049w9 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 = 600Ω CMRR vs Frequency VS = ±2.5V RL = 10kΩ 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 www.national.com 202049t1 14 Output Voltage Swing Pos vs Power Supply RL = 10kΩ 202049t2 202049t3 Supply Current per amplifier vs Power Supply RL = 2kΩ, Dual Supply Output Voltage Swing Pos vs Power Supply RL = 600Ω 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 Output Voltage Swing Pos vs Power Supply RL = 2kΩ LME49721 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. 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 202049x2 FIGURE 1. THD+N and IMD Distortion Test Circuit with AV = 2 should be equal to VDD/2. This is done by putting a resistor divider ckt at this node, see Figure 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 FIGURE 2. Single Supply Inverting Op Amp www.national.com 16 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 pow- 202049n1 FIGURE 4. Buffer 17 www.national.com LME49721 Figure 3 shows the typical connection for a dual supply inverting amplifier. The output voltage is centered on zero. 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 www.national.com 202049o4 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) C1 C2 R1 R2 32 0.12μF 4.7μF 75kΩ 500Ω 64 0.056μF 3.3μF 68kΩ 510Ω 125 0.033μF 1.5μF 62kΩ 510Ω 250 0.015μF 8200pF 0.82μF 68kΩ 470Ω 500 0.39μF 62kΩ 470Ω 1k 3900pF 0.22μF 68kΩ 470Ω 2k 2000pF 0.1μF 68kΩ 470Ω 4k 1100pF 0.056μF 62kΩ 470Ω 8k 510pF 0.022μF 68kΩ 510Ω 16k 330pF 0.012μF 51kΩ 510Ω Note 8: At volume of change = ±12 dB Q = 1.7 Reference: “AUDIO/RADIO HANDBOOK”, National Semiconductor, 1980, Page 2–61 23 www.national.com LME49721 Revision History Rev Date 1.0 09/26/07 Initial release. 1.1 10/01/07 Input more info under the Buffer Amplifier. www.national.com Description 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. 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