LME49720 LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier Literature Number: SNAS393B LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier General Description RL = 2k 0.00003% (typ) The LME49720 is part of the ultra-low distortion, low noise, high slew rate operational amplifier series optimized and fully specified for high performance, high fidelity applications. Combining advanced leading-edge process technology with state-of-the-art circuit design, the LME49720 audio operational amplifiers deliver superior audio signal amplification for outstanding audio performance. The LME49720 combines extremely low voltage noise density (2.7nV/Hz) with vanishingly low THD+N (0.00003%) to easily satisfy the most demanding audio applications. To ensure that the most challenging loads are driven without compromise, the LME49720 has a high slew rate of 20V/s and an output current capability of 26mA. Further, dynamic range is maximized by an output stage that drives 2k loads to within 1V of either power supply voltage and to within 1.4V when driving 600 loads. The LME49720's outstanding CMRR (120dB), PSRR (120dB), and VOS (0.1mV) give the amplifier excellent operational amplifier DC performance. The LME49720 has a wide supply range of 2.5V to 17V. Over this supply range the LME49720's input circuitry maintains excellent common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49720 is unity gain stable. This Audio Operational Amplifier achieves outstanding AC performance while driving complex loads with values as high as 100pF. The LME49720 is available in 8-lead narrow body SOIC, 8- lead Plastic DIP, and 8-lead Metal Can TO-99. Demonstration boards are available for each package. RL = 600 0.00003% (typ) Key Specifications Power Supply Voltage Range 2.5V to 17V Input Noise Density 2.7nV/Hz (typ) Slew Rate 20V/s (typ) Gain Bandwidth Product 55MHz (typ) Open Loop Gain (RL = 600) 140dB (typ) Input Bias Current 10nA (typ) Input Offset Voltage 0.1mV (typ) DC Gain Linearity Error 0.000009% Features Easily drives 600 loads Optimized for superior audio signal fidelity Output short circuit protection PSRR and CMRR exceed 120dB (typ) SOIC, DIP, TO-99 metal can packages Applications Ultra high quality 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 THD+N (AV = 1, VOUT = 3VRMS, fIN = 1kHz) Typical Application 300038k5 Passively Equalized RIAA Phono Preamplifier (c) 2007 National Semiconductor Corporation 300038 www.national.com LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier October 2007 LME49720 Connection Diagrams 30003855 Order Number LME49720MA See NS Package Number -- M08A Order Number LME49720NA See NS Package Number -- N08E Metal Can 300038f3 Order Number LME49720HA See NS Package Number -- H08C 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 36V -65C to 150C Output Short Circuit (Note 3) Power Dissipation ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) 200V 100V 150C JA (SO) 145C/W JA (NA) 102C/W JA (HA) 150C/W JC (HA) Temperature Range (V-) - 0.7V to (V+) + 0.7V Continuous Internally Limited 2000V 35C/W TMIN TA TMAX Supply Voltage Range Electrical Characteristics for the LME49720 (Notes 1, 2) VS = 15V, RL = 2k, fIN = 1kHz, and TA = 25C, unless otherwise specified. -40C TA 85C 2.5V VS 17V The following specifications apply for LME49720 Symbol Parameter Conditions Typical Limit (Note 6) (Note 7) Units (Limits) AV = 1, VOUT = 3Vrms THD+N Total Harmonic Distortion + Noise RL = 2k 0.00003 0.00003 RL = 600 IMD Intermodulation Distortion GBWP Gain Bandwidth Product SR Slew Rate AV = 1, VOUT = 3VRMS Two-tone, 60Hz & 7kHz 4:1 0.00009 0.00005 % 55 45 MHz (min) 20 15 V/s (min) FPBW Full Power Bandwidth VOUT = 1VP-P, -3dB referenced to output magnitude at f = 1kHz ts Settling time AV = -1, 10V step, CL = 100pF 0.1% error range 1.2 Equivalent Input Noise Voltage fBW = 20Hz to 20kHz 0.34 10 MHz s 0.65 VRMS (max) en Equivalent Input Noise Density f = 1kHz f = 10Hz 2.7 6.4 in Current Noise Density f = 1kHz f = 10Hz 1.6 3.1 VOS Offset Voltage 0.1 Average Input Offset Voltage Drift vs VOS/Temp -40C TA 85C Temperature 0.2 PSRR Average Input Offset Voltage Shift vs VS = 20V (Note 8) Power Supply Voltage 120 ISOCH-CH Channel-to-Channel Isolation fIN = 1kHz fIN = 20kHz 118 112 IB Input Bias Current VCM = 0V 10 IOS/Temp Input Bias Current Drift vs Temperature -40C TA 85C 0.1 IOS Input Offset Current VCM = 0V VIN-CM Common-Mode Input Voltage Range CMRR Common-Mode Rejection ZIN % (max) nV/Hz (max) pA/Hz 0.7 mV (max) V/C 110 dB (min) dB 72 nA (max) nA/C 11 65 nA (max) +14.1 -13.9 (V+) - 2.0 (V-) + 2.0 V (min) -10V<Vcm<10V 120 110 dB (min) 30 k -10V<Vcm<10V 1000 M Differential Input Impedance Common Mode Input Impedance 4.7 3 www.national.com LME49720 Pins 1, 4, 7 and 8 Pins 2, 3, 5 and 6 Junction Temperature Thermal Resistance Absolute Maximum Ratings (Notes 1, 2) LME49720 LME49720 Symbol AVOL Typical Limit (Note 6) (Note 7) -10V<Vout<10V, RL = 600 140 125 -10V<Vout<10V, RL = 2k 140 Parameter Open Loop Voltage Gain Conditions -10V<Vout<10V, RL = 10k VOUTMAX IOUT Maximum Output Voltage Swing Output Current dB (min) 140 RL = 600 13.6 RL = 2k 14.0 RL = 10k 14.1 RL = 600, VS = 17V Units (Limits) 26 12.5 V (min) 23 +53 -42 IOUT-CC Instantaneous Short Circuit Current ROUT Output Impedance fIN = 10kHz Closed-Loop Open-Loop CLOAD Capacitive Load Drive Overshoot 100pF 16 IS Total Quiescent Current IOUT = 0mA 10 mA (min) mA 0.01 13 % 12 mA (max) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 3: Amplifier output connected to GND, any number of amplifiers within a package. Note 4: Human body model, 100pF discharged through a 1.5k resistor. Note 5: Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200pF cap is charged to the specified voltage and then discharged directly into the IC with no external series resistor (resistance of discharge path must be under 50). Note 6: Typical specifications are specified at +25C and represent the most likely parametric norm. Note 7: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level). Note 8: PSRR is measured as follows: VOS is measured at two supply voltages, 5V and 15V. PSRR = | 20log(VOS/VS) |. www.national.com 4 LME49720 Typical Performance Characteristics THD+N vs Output Voltage VCC = 15V, VEE = -15V RL = 2k THD+N vs Output Voltage VCC = 12V, VEE = -12V RL = 2k 300038k6 300038k7 THD+N vs Output Voltage VCC = 17V, VEE = -17V RL = 2k THD+N vs Output Voltage VCC = 2.5V, VEE = -2.5V RL = 2k 300038k8 300038i4 THD+N vs Output Voltage VCC = 15V, VEE = -15V RL = 600 THD+N vs Output Voltage VCC = 12V, VEE = -12V RL = 600 300038k9 300038l0 5 www.national.com LME49720 THD+N vs Output Voltage VCC = 17V, VEE = -17V RL = 600 THD+N vs Output Voltage VCC = 2.5V, VEE = -2.5V RL = 600 300038l1 300038i6 THD+N vs Output Voltage VCC = 15V, VEE = -15V RL = 10k THD+N vs Output Voltage VCC = 12V, VEE = -12V RL = 10k 300038l2 300038l3 THD+N vs Output Voltage VCC = 17V, VEE = -17V RL = 10k THD+N vs Output Voltage VCC = 2.5V, VEE = -2.5V RL = 10k 300038l4 300038i5 www.national.com 6 LME49720 THD+N vs Frequency VCC = 15V, VEE = -15V, VOUT = 3VRMS RL = 2k THD+N vs Frequency VCC = 12V, VEE = -12V, VOUT = 3VRMS RL = 2k 30003862 30003863 THD+N vs Frequency VCC = 17V, VEE = -17V, VOUT = 3VRMS RL = 2k THD+N vs Frequency VCC = 15V, VEE = -15V, VOUT = 3VRMS RL = 600 30003864 30003859 THD+N vs Frequency VCC = 12V, VEE = -12V, VOUT = 3VRMS RL = 600 THD+N vs Frequency VCC = 17V, VEE = -17V, VOUT = 3VRMS RL = 600 300038k3 30003860 7 www.national.com LME49720 THD+N vs Frequency VCC = 15V, VEE = -15V, VOUT = 3VRMS RL = 10k THD+N vs Frequency VCC = 12V, VEE = -12V, VOUT = 3VRMS RL = 10k 30003866 30003867 THD+N vs Frequency VCC = 17V, VEE = -17V, VOUT = 3VRMS RL = 10k IMD vs Output Voltage VCC = 15V, VEE = -15V RL = 2k 30003868 300038e6 IMD vs Output Voltage VCC = 12V, VEE = -12V RL = 2k IMD vs Output Voltage VCC = 2.5V, VEE = -2.5V RL = 2k 300038e5 www.national.com 300038e4 8 LME49720 IMD vs Output Voltage VCC = 17V, VEE = -17V RL = 2k IMD vs Output Voltage VCC = 15V, VEE = -15V RL = 600 300038e7 300038e2 IMD vs Output Voltage VCC = 12V, VEE = -12V RL = 600 IMD vs Output Voltage VCC = 17V, VEE = -17V RL = 600 300038e0 300038e3 IMD vs Output Voltage VCC = 2.5V, VEE = -2.5V RL = 600 IMD vs Output Voltage VCC = 15V, VEE = -15V RL = 10k 300038e1 300038f1 9 www.national.com LME49720 IMD vs Output Voltage VCC = 12V, VEE = -12V RL = 10k IMD vs Output Voltage VCC = 17V, VEE = -17V RL = 10k 300038f0 300038f2 IMD vs Output Voltage VCC = 2.5V, VEE = -2.5V RL = 10k Voltage Noise Density vs Frequency 300038h6 300038l6 Current Noise Density vs Frequency Crosstalk vs Frequency VCC = 15V, VEE = -15V, VOUT = 3VRMS AV = 0dB, RL = 2k 300038h7 300038c8 www.national.com 10 LME49720 Crosstalk vs Frequency VCC = 15V, VEE = -15V, VOUT = 10VRMS AV = 0dB, RL = 2k Crosstalk vs Frequency VCC = 12V, VEE = -12V, VOUT = 3VRMS AV = 0dB, RL = 2k 300038c9 300038c6 Crosstalk vs Frequency VCC = 12V, VEE = -12V, VOUT = 10VRMS AV = 0dB, RL = 2k Crosstalk vs Frequency VCC = 17V, VEE = -17V, VOUT = 3VRMS AV = 0dB, RL = 2k 300038c7 300038d0 Crosstalk vs Frequency VCC = 17V, VEE = -17V, VOUT = 10VRMS AV = 0dB, RL = 2k Crosstalk vs Frequency VCC = 2.5V, VEE = -2.5V, VOUT = 1VRMS AV = 0dB, RL = 2k 300038d1 300038n8 11 www.national.com LME49720 Crosstalk vs Frequency VCC = 15V, VEE = -15V, VOUT = 3VRMS AV = 0dB, RL = 600 Crosstalk vs Frequency VCC = 15V, VEE = -15V, VOUT = 10VRMS AV = 0dB, RL = 600 300038d6 300038d7 Crosstalk vs Frequency VCC = 12V, VEE = -12V, VOUT = 3VRMS AV = 0dB, RL = 600 Crosstalk vs Frequency VCC = 12V, VEE = -12V, VOUT = 10VRMS AV = 0dB, RL = 600 300038d4 300038d5 Crosstalk vs Frequency VCC = 17V, VEE = -17V, VOUT = 3VRMS AV = 0dB, RL = 600 Crosstalk vs Frequency VCC = 17V, VEE = -17V, VOUT = 10VRMS AV = 0dB, RL = 600 300038d8 www.national.com 300038d9 12 LME49720 Crosstalk vs Frequency VCC = 2.5V, VEE = -2.5V, VOUT = 1VRMS AV = 0dB, RL = 600 Crosstalk vs Frequency VCC = 15V, VEE = -15V, VOUT = 3VRMS AV = 0dB, RL = 10k 300038d2 300038o0 Crosstalk vs Frequency VCC = 15V, VEE = -15V, VOUT = 10VRMS AV = 0dB, RL = 10k Crosstalk vs Frequency VCC = 12V, VEE = -12V, VOUT = 3VRMS AV = 0dB, RL = 10k 300038n7 300038n9 Crosstalk vs Frequency VCC = 12V, VEE = -12V, VOUT = 10VRMS AV = 0dB, RL = 10k Crosstalk vs Frequency VCC = 17V, VEE = -17V, VOUT = 3VRMS AV = 0dB, RL = 10k 300038n6 300038n5 13 www.national.com LME49720 Crosstalk vs Frequency VCC = 17V, VEE = -17V, VOUT = 10VRMS AV = 0dB, RL = 10k Crosstalk vs Frequency VCC = 2.5V, VEE = -2.5V, VOUT = 1VRMS AV = 0dB, RL = 10k 300038n3 300038n4 PSRR+ vs Frequency VCC = 15V, VEE = -15V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 15V, VEE = -15V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp 300038p2 300038p5 PSRR+ vs Frequency VCC = 15V, VEE = -15V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 15V, VEE = -15V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp 300038p3 300038p6 www.national.com 14 PSRR- vs Frequency VCC = 15V, VEE = -15V RL = 600, f = 200kHz, VRIPPLE = 200mVpp 300038p4 300038p1 PSRR+ vs Frequency VCC = 12V, VEE = -12V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 12V, VEE = -12V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp 300038p8 300038q1 PSRR+ vs Frequency VCC = 12V, VEE = -12V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 12V, VEE = -12V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp 300038p9 300038q2 15 www.national.com LME49720 PSRR+ vs Frequency VCC = 15V, VEE = -15V RL = 600, f = 200kHz, VRIPPLE = 200mVpp LME49720 PSRR+ vs Frequency VCC = 12V, VEE = -12V RL = 600, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 12V, VEE = -12V RL = 600, f = 200kHz, VRIPPLE = 200mVpp 300038q0 300038p7 PSRR+ vs Frequency VCC = 17V, VEE = -17V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 17V, VEE = -17V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp 300038r0 300038r3 PSRR+ vs Frequency VCC = 17V, VEE = -17V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 17V, VEE = -17V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp 300038r1 300038r4 www.national.com 16 PSRR- vs Frequency VCC = 17V, VEE = -17V RL = 600, f = 200kHz, VRIPPLE = 200mVpp 300038q9 300038r2 PSRR+ vs Frequency VCC = 2.5V, VEE = -2.5V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 2.5V, VEE = -2.5V RL = 10k, f = 200kHz, VRIPPLE = 200mVpp 300038q4 300038q7 PSRR+ vs Frequency VCC = 2.5V, VEE = -2.5V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 2.5V, VEE = -2.5V RL = 2k, f = 200kHz, VRIPPLE = 200mVpp 300038q5 300038q8 17 www.national.com LME49720 PSRR+ vs Frequency VCC = 17V, VEE = -17V RL = 600, f = 200kHz, VRIPPLE = 200mVpp LME49720 PSRR+ vs Frequency VCC = 2.5V, VEE = -2.5V RL = 600, f = 200kHz, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 2.5V, VEE = -2.5V RL = 600, f = 200kHz, VRIPPLE = 200mVpp 300038q3 300038q6 CMRR vs Frequency VCC = 15V, VEE = -15V RL = 2k CMRR vs Frequency VCC = 12V, VEE = -12V RL = 2k 300038f7 300038g0 CMRR vs Frequency VCC = 17V, VEE = -17V RL = 2k CMRR vs Frequency VCC = 2.5V, VEE = -2.5V RL = 2k 300038g3 www.national.com 300038f4 18 LME49720 CMRR vs Frequency VCC = 15V, VEE = -15V RL = 600 CMRR vs Frequency VCC = 12V, VEE = -12V RL = 600 300038o9 300038f9 CMRR vs Frequency VCC = 17V, VEE = -17V RL = 600 CMRR vs Frequency VCC = 2.5V, VEE = -2.5V RL = 600 300038g5 300038f6 CMRR vs Frequency VCC = 15V, VEE = -15V RL = 10k CMRR vs Frequency VCC = 12V, VEE = -12V RL = 10k 300038o8 300038f8 19 www.national.com LME49720 CMRR vs Frequency VCC = 17V, VEE = -17V RL = 10k CMRR vs Frequency VCC = 2.5V, VEE = -2.5V RL = 10k 300038g4 300038f5 Output Voltage vs Load Resistance VDD = 15V, VEE = -15V THD+N = 1% Output Voltage vs Load Resistance VDD = 12V, VEE = -12V THD+N = 1% 300038h0 300038h1 Output Voltage vs Load Resistance VDD = 17V, VEE = -17V THD+N = 1% Output Voltage vs Load Resistance VDD = 2.5V, VEE = -2.5V THD+N = 1% 300038h2 www.national.com 300038g9 20 LME49720 Output Voltage vs Supply Voltage RL = 2k, THD+N = 1% Output Voltage vs Supply Voltage RL = 600, THD+N = 1% 300038j8 300038j9 Output Voltage vs Supply Voltage RL = 10k, THD+N = 1% Supply Current vs Supply Voltage RL = 2k 300038k0 300038j6 Supply Current vs Supply Voltage RL = 600 Supply Current vs Supply Voltage RL = 10k 300038j7 300038j5 21 www.national.com LME49720 Full Power Bandwidth vs Frequency Gain Phase vs Frequency 300038j0 300038j1 Small-Signal Transient Response AV = 1, CL = 10pF Small-Signal Transient Response AV = 1, CL = 100pF 300038i7 www.national.com 300038i8 22 DISTORTION MEASUREMENTS The vanishingly low residual distortion produced by LME49720 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 LME49720's low residual distortion is an input referred internal error. As shown in Figure 1, adding the 10 resistor connected between the amplifier's inverting and non-inverting 300038k4 FIGURE 1. THD+N and IMD Distortion Test Circuit 23 www.national.com LME49720 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, which means that measurement resolution increases 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 the measurement equipment's 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 LME49720 The LME49720 is a high speed op amp with excellent phase margin and stability. Capacitive loads up to 100pF will cause little change in the phase characteristics of the amplifiers and are therefore allowable. Capacitive loads greater than 100pF must be isolated from the output. The most straightforward way to do this is to put a resistor in series with the output. This resistor will also prevent excess power dissipation if the output is accidentally shorted. 30003827 Complete shielding is required to prevent induced pick up from external sources. Always check with oscilloscope for power line noise. Noise Measurement Circuit Total Gain: 115 dB @f = 1 kHz Input Referred Noise Voltage: en = V0/560,000 (V) RIAA Preamp Voltage Gain, RIAA Deviation vs Frequency Flat Amp Voltage Gain vs Frequency 30003828 www.national.com 30003829 24 LME49720 TYPICAL APPLICATIONS NAB Preamp NAB Preamp Voltage Gain vs Frequency 30003831 30003830 AV = 34.5 F = 1 kHz En = 0.38 V A Weighted Balanced to Single Ended Converter Adder/Subtracter 30003833 VO = V1 + V2 - V3 - V4 30003832 VO = V1-V2 Sine Wave Oscillator 30003834 25 www.national.com LME49720 Second Order High Pass Filter (Butterworth) Second Order Low Pass Filter (Butterworth) 30003835 30003836 Illustration is f0 = 1 kHz Illustration is f0 = 1 kHz State Variable Filter 30003837 Illustration is f0 = 1 kHz, Q = 10, ABP = 1 www.national.com 26 LME49720 AC/DC Converter 30003838 2 Channel Panning Circuit (Pan Pot) Line Driver 30003839 30003840 Tone Control 300038p0 27 www.national.com LME49720 Illustration is: fL = 32 Hz, fLB = 320 Hz fH =11 kHz, fHB = 1.1 kHz 30003842 RIAA Preamp 30003803 Av = 35 dB En = 0.33 V S/N = 90 dB f = 1 kHz A Weighted A Weighted, VIN = 10 mV @f = 1 kHz www.national.com 28 LME49720 Balanced Input Mic Amp 30003843 Illustration is: V0 = 101(V2 - V1) 29 www.national.com LME49720 10 Band Graphic Equalizer 30003844 fo (Hz) C1 C2 R1 R2 32 0.12F 4.7F 75k 500 64 0.056F 3.3F 68k 510 125 0.033F 1.5F 62k 510 250 0.015F 8200pF 0.82F 68k 470 500 0.39F 62k 470 1k 3900pF 0.22F 68k 470 2k 2000pF 0.1F 68k 470 4k 1100pF 0.056F 62k 470 8k 510pF 0.022F 68k 510 16k 330pF 0.012F 51k 510 Note 9: At volume of change = 12 dB Q = 1.7 Reference: "AUDIO/RADIO HANDBOOK", National Semiconductor, 1980, Page 2-61 www.national.com 30 LME49720 Revision History Rev Date 1.0 03/30/07 Description Initial release. 1.1 05/03/07 Put the "general note" under the EC table. 1.2 10/22/07 Replaced all the PSRR curves. 31 www.national.com LME49720 Physical Dimensions inches (millimeters) unless otherwise noted Narrow SOIC Package Order Number LME49720MA NS Package Number M08A Dual-In-Line Package Order Number LME49720NA NS Package Number N08E www.national.com 32 LME49720 TO-99 Metal Can Package Order Number LME49720HA NS Package Number H08C 33 www.national.com LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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