LME49743 Quad High Performance, High Fidelity Audio Operational Amplifier General Description Key Specifications The LME49743 is a low distortion, low noise, high slew rate operational amplifier optimized and fully specified for high performance, high fidelity applications. The LME49743 audio operational amplifier delivers superior audio signal amplification for outstanding audio performance. The LME49743 combines low voltage noise density (3.5nV/√Hz) and THD+N (0.0001%) to easily satisfy demanding audio applications. To ensure that the most challenging loads are driven without compromise, the LME49743 has a slew rate of ±12V/μs and an output current capability of ±21mA. The LME49743's outstanding CMRR(106dB), PSRR(98dB), and VOS (±0.15mV) give the amplifier excellent operational amplifier DC performance. The LME49743 has a wide supply range of ±4.0V to ±17V. Over this supply range the LME49743’s input circuitry maintains excellent common-mode, power supply rejection, and low input bias current. The LME49743 is unity gain stable. The LME49743 is available in 14–lead TSSOP. ■ Power Supply Voltage Range ±4.0V to ±17V ■ THD+N (AV = 1, VOUT = 3VRMS, fIN = 1kHz) RL = 2kΩ 0.0001% (typ) RL = 600Ω 0.0001% (typ) ■ Input Noise Density 3.5nV/√Hz (typ) ■ Slew Rate ±12V/μs (typ) ■ Gain Bandwidth Product 30MHz (typ) ■ Open Loop Gain (RL = 600Ω) 110dB (typ) ■ Input Bias Current 190nA (typ) ■ Input Offset Voltage ±0.15mV (typ) Features ■ ■ ■ ■ ■ Easily drives 600Ω loads Optimized for superior audio signal fidelity Output short circuit protection 98dB (typ) PSRR and 106dB (typ) CMRR TSSOP package Applications ■ ■ ■ ■ ■ © 2009 National Semiconductor Corporation 300481 Audio amplifiers and preamplifiers Professional Audio Equalization and crossover networks Line drivers and receivers Active filters www.national.com LME49743 Quad High Performance, High Fidelity Audio Operational Amplifier January 12, 2009 LME49743 Connection Diagram 30048101 Order Number LME49743MT See NS Package Number — MTC14 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 (MT) Temperature Range 36V −65°C to 150°C Output Short Circuit (Note 3) (Notes 1, 2) 140°C/W TMIN ≤ TA ≤ TMAX Supply Voltage Range (V-) - 0.7V to (V+) + 0.7V Continuous Electrical Characteristics Internally Limited 750V 175V 150°C –40°C ≤ TA ≤ 85°C ±4.0V ≤ VS ≤ ± 17V The following specifications apply for VS = ±15V, RL = 2kΩ, fIN = 1kHz, and TA = 25C, unless otherwise specified. LME49743 Symbol Parameter Conditions Typical Limit (Note 6) (Notes 7, 8) Units (Limits) AV = 1, VOUT = 3VRMS THD+N Total Harmonic Distortion + Noise RL = 2kΩ RL = 600Ω AV = 1, VOUT = 3VRMS Two-tone, 60Hz & 7kHz 4:1 0.0001 0.0001 0.0002 IMD Intermodulation Distortion GBWP Gain Bandwidth Product 30 25 MHz (min) SR Slew Rate 12 9.5 V/μs (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 0.48 0.65 en Equivalent Input Noise Density f = 1kHz f = 10Hz 3.5 6.4 4.5 in Current Noise Density f = 1kHz f = 10Hz 1.6 3.1 nV/√Hz (max) nV/√Hz pA/√Hz pA/√Hz VOS Offset Voltage ±0.15 ±1.0 mV (max) ΔVOS/ΔTemp Average Input Offset Voltage Drift vs 40°C ≤ TA ≤ 85°C Temperature 0.05 PSRR Average Input Offset Voltage Shift vs ΔVS = 20V (Note 9) Power Supply Voltage 98 ISOCH-CH Channel-to-Channel Isolation fIN = 1kHz fIN = 20kHz 118 112 IB Input Bias Current VCM = 0V 190 ΔIOS/ΔTemp Input Bias Current Drift vs Temperature –40°C ≤ TA ≤ 85°C 0.05 IOS Input Offset Current VCM = 0V VIN-CM Common-Mode Input Voltage Range CMRR Common-Mode Rejection ZIN AVOL –10V<VCM<10V Differential Input Impedance Common Mode Input Impedance Open Loop Voltage Gain 0.0005 % (max) % (max) 10 MHz μs μVRMS μV/°C 94 dB (min) dB dB 250 nA (max) nA/°C 7 40 nA (max) ±13.2 (V+)–2.0 (V-)+2.0 V (min) V (min) 106 98 dB (min) 30 kΩ –10V<VCM<10V 1000 MΩ –10V<VOUT<10V, RL = 600Ω 110 dB (min) –10V<VOUT<10V, RL = 2kΩ 110 dB (min) –10V<VOUT<10V, RL = 10kΩ 110 3 100 dB (min) www.national.com LME49743 Power Dissipation ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Thermal Resistance Absolute Maximum Ratings (Notes 1, 2) LME49743 LME49743 Symbol Typical Limit (Note 6) (Notes 7, 8) RL = 600Ω ±12.4 ±12.0 RL = 2kΩ ±13.0 RL = 10kΩ ±13.0 Parameter Conditions VOUTMAX Maximum Output Voltage Swing IOUT Output Current IOUT-CC 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 RL = 600Ω, VS = ±17V ±21 Units (Limits) V (min) V (min) V (min) ±20 mA (min) +30 –38 mA mA 0.01 13 Ω Ω % 14 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 1.5kΩ 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 50Ω). Note 6: Typical specifications are specified at +25ºC and represent the most likely parametric norm. Note 7: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level). Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Note 9: PSRR is measured as follows: VOS is measured at two supply voltages, ±5V and ±15V. PSRR = |20log(ΔVOS/ΔVS)|. www.national.com 4 LME49743 Typical Performance Characteristics THD+N vs Output Voltage VS = ±15V, RL = 2kΩ, f = 1kHz 30kHz BW THD+N vs Output Voltage VS = ±15V, RL = 10kΩ, f = 1kHz 30kHz BW 300481b6 300481b7 THD+N vs Output Voltage VS = ±15V, RL = 600Ω, f = 1kHz 30kHz BW THD+N vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 2kΩ 80kHz BW 300481b8 300481b0 THD+N vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 10kΩ 80kHz BW THD+N vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 600Ω 80kHz BW 300481b1 300481b2 5 www.national.com LME49743 +PSRR vs Frequency VS = ±15V, RL = 2kΩ, VRIPPLE = 200mVPP +PSRR vs Frequency VS = ±15V, RL = 10kΩ, VRIPPLE = 200mVPP 300481a1 300481a2 +PSRR vs Frequency VS = ±15V, RL = 600Ω, VRIPPLE = 200mVPP −PSRR vs Frequency VS = ±15V, RL = 2kΩ, VRIPPLE = 200mVPP 300481a3 300481a7 −PSRR vs Frequency VS = ±15V, RL = 10kΩ, VRIPPLE = 200mVPP −PSRR vs Frequency VS = ±15V, RL = 600Ω, VRIPPLE = 200mVPP 300481a8 www.national.com 300481a9 6 LME49743 CMRR vs Frequency VS = ±15V, RL = 2kΩ, VIN = 200mVPP CMRR vs Frequency VS = ±15V, RL = 10kΩ, VIN = 200mVPP 30048190 30048189 CMRR vs Frequency VS = ±15V, RL = 600Ω, VIN = 200mVPP Crosstalk vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 2kΩ 30048191 300481b9 Crosstalk vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 10kΩ Crosstalk vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 600Ω 300481c0 300481c1 7 www.national.com LME49743 IMD vs Output Voltage VS = ±5V, RL = 2kΩ 7kHz/60Hz 4:1 SMPTE IMD vs Output Voltage VS = ±5V, RL = 10kΩ 7kHz/60Hz 4:1 SMPTE 30048195 30048196 IMD vs Output Voltage VS = ±5V, RL = 600Ω 7kHz/60Hz 4:1 SMPTE Output Voltage vs Supply Voltage RL = 2kΩ, THD+N = 0.1% 30048163 30048197 Output Voltage vs Supply Voltage RL = 10kΩ, THD+N = 0.1% Output Voltage vs Supply Voltage RL = 600Ω, THD+N = 0.1% 30048165 30048164 www.national.com 8 LME49743 Supply Current vs Supply Voltage Scope Photo Small Signal 300481c4 30048185 Scope Photo Large Signal, Non-Inverting Scope Photo Large Signal, Inverting 30048187 30048186 Equivalent Input Noise vs Frequency Power Bandwidth 30048188 30048192 9 www.national.com LME49743 Open Loop Gain and Phase vs Frequency 30048193 www.national.com 10 DISTORTION MEASUREMENTS The vanishingly low residual distortion produced by LME49743 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 LME49743’s low residual distortion is an input referred internal error. As shown in Figure 1, adding the 10Ω resistor connected between the amplifier’s inverting and non-inverting 30048122 FIGURE 1. THD+N and IMD Distortion Test Circuit 11 www.national.com LME49743 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 LME49743 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. Application Hints The LME49743 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. Noise Measurement Circuit 30048121 Complete shielding is required to prevent induced pick up from external sources. Always check with oscilloscope for power line noise. Total Gain: 115 dB at f = 1 kHz Input Referred Noise Voltage: en = VO/560,000 (V) RIAA Preamp Voltage Gain, RIAA Deviation vs Frequency VIN = 10mV, AV = 35.0dB, f = 1kHz Flat Amp Voltage Gain vs Frequency VO = 0dB, AV = 80.0dB, f = 1kHz 30048129 30048128 www.national.com 12 LME49743 Typical Applications State Variable Filter 30048137 AC/DC Converter 30048138 13 www.national.com LME49743 2 Channel Panning Circuit (Pan Pot) Line Driver 30048140 30048139 Tone Control 30048141 30048142 www.national.com 14 LME49743 RIAA Preamp 30048103 Av = 35 dB En = 0.33 μV S/N = 90 dB f = 1 kHz A Weighted A Weighted, VIN = 10 mV @f = 1 kHz Balanced Input Mic Amp 30048143 Illustration is: V0 = 101(V2 − V1) 15 www.national.com LME49743 10 Band Graphic Equalizer 30048144 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 10: At volume of change = ±12 dB Q = 1.7 Reference: “AUDIO/RADIO HANDBOOK”, National Semiconductor, 1980, Page 2–61 www.national.com 16 LME49743 Revision History Rev Date 1.0 03/26/08 Description Initial release. 1.01 01/12/09 Fixed a typo. 17 www.national.com LME49743 Physical Dimensions inches (millimeters) unless otherwise noted Dual-In-Line Package Order Number LME49743MT NS Package Number MTC14 www.national.com 18 LME49743 Notes 19 www.national.com LME49743 Quad High Performance, High Fidelity Audio Operational Amplifier Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy PowerWise® Solutions www.national.com/powerwise Solutions www.national.com/solutions Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero Temperature Sensors www.national.com/tempsensors Solar Magic® www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless Analog University® www.national.com/AU THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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