LME49740 Quad High Performance, High Fidelity Audio Operational Amplifier General Description Key Specifications The LME49740 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 LME49740 audio operational amplifiers deliver superior audio signal amplification for outstanding audio performance. The LME49740 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 LME49740 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 LME49740's outstanding CMRR(120dB), PSRR(120dB), and VOS(0.1mV) give the amplifier excellent operational amplifier DC performance. The LME49740 has a wide supply range of 2.5V to 17V. Over this supply range the LME49740's input circuitry maintains excellent common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49740 is unity gain stable. The Audio Operational Amplifier achieves outstanding AC performance while driving complex loads with values as high as 100pF. The LME49740 is available in 14-lead narrow body SOIC and 14-lead plastic DIP. Demonstration boards are available for each package. Power Supply Voltage Range THD+N (AV = 1, VOUT = 3VRMS, fIN = 1kHz) 202105 RL = 2k 0.00003% (typ) RL = 600 0.00003% (typ) 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 and DIP packages Applications (c) 2008 National Semiconductor Corporation 2.5V to 17V 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 www.national.com LME49740 Quad High Performance, High Fidelity Audio Operational Amplifier February 8, 2008 LME49740 Typical Application 20210502 FIGURE 1. Passively Equalized RIAA Phono Preamplifier Connection Diagram 20210501 Order Number LME49740MA See NS Package Number -- M14A Order Number LME49740NA See NS Package Number -- N14A www.national.com 2 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. 2000V 200V 150C JA (MA) Power Supply Voltage (VS = V+ - V-) Storage Temperature Input Voltage JA (NA) Temperature Range 36V -65C to 150C Output Short Circuit (Note 3) Power Dissipation (V-)-0.7V to (V+)+0.7V Continuous Internally Limited Electrical Characteristics (Notes 1, 2) 107C/W 74C/W TMIN TA TMAX Supply Voltage Range -40C TA 85C 2.5V VS 17V The following specifications apply for VS = 15V, RL = 2k, fIN = 1kHz, and TA = 25C, unless otherwise specified. LME49740 Symbol Parameter Conditions Typical Limit (Note 6) (Notes 7, 8) AV = 1, VOUT = 3VRMS THD+N Total Harmonic Distortion + Noise RL = 2k 0.00003 0.00003 RL = 600 AV = 1, VOUT = 3VRMS Two-tone, 60Hz & 7kHz 4:1 0.00009 0.00005 Units (Limits) % (max) % (max) IMD Intermodulation Distortion % (max) GBWP Gain Bandwidth Product 55 45 MHz (min) SR Slew Rate 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 0.65 VRMS Equivalent Input Noise Density f = 1kHz f = 10Hz 2.7 6.4 4.7 in Current Noise Density f = 1kHz f = 10Hz 1.6 3.1 nV/Hz nV/Hz pA/Hz pA/Hz VOS Offset Voltage 0.7 mV (max) en 10 0.1 Average Input Offset Voltage Drift vs VOS/Temp 40C TA 85C Temperature Average Input Offset Voltage Shift vs VS = 20V (Note 9) Power Supply Voltage 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 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 s V/C 0.2 PSRR VIN-CM MHz 120 110 dB (min) dB dB 72 nA (max) nA/C 11 65 nA (max) +14.1 -13.9 (V+)-2.0 (V-)+2.0 V (min) V (min) 120 110 dB (min) 30 k -10V<VCM<10V 1000 M -10V<VOUT<10V, RL = 600 140 dB (min) -10V<VOUT<10V, RL = 2k 140 dB (min) -10V<VOUT<10V, RL = 10k 140 3 125 dB (min) www.national.com LME49740 ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Thermal Resistance Absolute Maximum Ratings (Notes 1, 2) LME49740 LME49740 Symbol Typical Limit (Note 6) (Notes 7, 8) RL = 600 13.6 12.5 RL = 2k 14.0 RL = 10k 14.1 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 IS Total Quiescent Current IOUT = 0mA RL = 600, VS = 17V 26 Units (Limits) V (min) V (min) V (min) 23 mA (min) +30 -38 mA mA 0.01 13 16 18.5 % 20 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: 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(VOS/VS)|. www.national.com 4 LME49740 Typical Performance Characteristics THD+N vs Output Voltage VCC = 15V, VEE = -15V, RL = 2k THD+N vs Output Voltage VCC = 17V, VEE = -17V, RL = 2k 20210515 20210516 THD+N vs Frequency VCC = 15V, VEE = -15V, RL = 2k, VOUT = 3VRMS THD+N vs Frequency VCC = 17V, VEE = -17V, RL = 2k, VOUT = 3VRMS 20210511 20210513 THD+N vs Frequency VCC = 15V, VEE = -15V, RL = 600, VOUT = 3VRMS THD+N vs Frequency VCC = 17V, VEE = -17V, RL = 600, VOUT = 3VRMS 20210514 20210512 5 www.national.com LME49740 IMD vs Output Voltage VCC = 15V, VEE = -15V, RL = 2k IMD vs Output Voltage VCC = 17V, VEE = -17V, RL = 2k 20210553 20210554 PSRR+ vs Frequency VCC = 15V, VEE = -15V, RL = 2k, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 15V, VEE = -15V, RL = 2k RL = 2k, VRIPPLE = 200mVpp 20210559 20210560 CMRR vs Frequency VCC = 15V, VEE = -15V, RL = 2k Crosstalk vs Frequency VCC = 15V, VEE = -15V, RL = 2k 20210552 www.national.com 20210519 6 LME49740 Output Voltage vs Supply Voltage RL = 2k, THD+N = 1% Output Voltage vs Load Resistance THD+N = 1% 20210517 20210518 Supply Current vs Supply Voltage RL = 2k, THD+N = 1% Full Power Bandwidth vs Frequency 20210520 20210507 Gain Phase vs Frequency Voltage Noise Density vs Frequency 20210557 20210551 7 www.national.com LME49740 Small-Signal Transient Response AV = 1, CL = 100pF Large-Signal Transient Response AV = 1, CL = 100pF 20210556 www.national.com 20210555 8 DISTORTION MEASUREMENTS The vanishingly low residual distortion produced by LME49740 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 LME49740's low residual distortion is an input referred internal error. As shown in Figure 2, adding the 10 resistor connected between the amplifier's inverting and non-inverting 20210562 FIGURE 2. THD+N and IMD Distortion Test Circuit 9 www.national.com LME49740 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 2. 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 LME49740 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 LME49740 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 20210527 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 20210529 20210528 www.national.com 10 NAB Preamp NAB Preamp Voltage Gain vs Frequency VIN = 10mV, AV = 34.5dB, f = 1kHz 20210530 AV = 34.5 F = 1 kHz En = 0.38 V A Weighted 20210531 Balanced to Single Ended Converter Adder/Subtracter 20210533 VO = V1 + V2 - V3 - V4 20210532 VO = V1-V2 Sine Wave Oscillator 20210534 11 www.national.com LME49740 Typical Applications LME49740 Second Order High Pass Filter (Butterworth) Second Order Low Pass Filter (Butterworth) 20210535 20210536 Illustration is f0 = 1 kHz Illustration is f0 = 1 kHz State Variable Filter 20210537 www.national.com 12 LME49740 AC/DC Converter 20210538 2 Channel Panning Circuit (Pan Pot) Line Driver 20210540 20210539 Tone Control 20210541 13 www.national.com LME49740 20210542 RIAA Preamp 20210503 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 14 LME49740 Balanced Input Mic Amp 20210543 Illustration is: V0 = 101(V2 - V1) 15 www.national.com LME49740 10 Band Graphic Equalizer 20210544 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 10: At volume of change = 12 dB Q = 1.7 Reference: "AUDIO/RADIO HANDBOOK", National Semiconductor, 1980, Page 2-61 www.national.com 16 LME49740 Revision History Rev Date 1.0 02/28/07 Description Initial WEB release. 1.01 02/08/08 Fixed the captions on the LME4970MA package (from Dual-InLine to Molded Package (SO). 17 www.national.com LME49740 Physical Dimensions inches (millimeters) unless otherwise noted Molded Package (SO) Order Number LME49740MA NS Package Number M14A Dual-In-Line Package Order Number LME49740NA NS Package Number N14A www.national.com 18 LME49740 19 www.national.com LME49740 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 www.national.com/webench Audio www.national.com/audio Analog University www.national.com/AU Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes Data Converters www.national.com/adc Distributors www.national.com/contacts Displays www.national.com/displays Green Compliance www.national.com/quality/green Ethernet www.national.com/ethernet Packaging www.national.com/packaging Interface www.national.com/interface Quality and Reliability www.national.com/quality LVDS www.national.com/lvds Reference Designs www.national.com/refdesigns Power Management www.national.com/power Feedback www.national.com/feedback Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www.national.com/led PowerWise www.national.com/powerwise Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors Wireless (PLL/VCO) www.national.com/wireless THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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