LME49710 High Performance, High Fidelity Audio Operational Amplifier General Description Key Specifications The LME49710 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 LME49710 audio operational amplifiers deliver superior audio signal amplification for outstanding audio performance. The LME49710 combines extremely low voltage noise density (2.5nV/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 LME49710 has a high slew rate of ±20V/μs and an output current capability of ±26mA. Further, dynamic range is maximized by an output stage that drives 2kΩ loads to within 1V of either power supply voltage and to within 1.4V when driving 600Ω loads. The LME49710's outstanding CMRR(120dB), PSRR(120dB), and VOS (0.05mV) give the amplifier excellent operational amplifier DC performance. The LME49710 has a wide supply range of ±2.5V to ±17V. Over this supply range the LME49710’s input circuitry maintains excellent common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49710 is unity gain stable. The Audio Operational Amplifier achieves outstanding AC performance while driving complex loads with values as high as 100pF. The LME49710 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. © 2007 National Semiconductor Corporation 202104 ■ Power Supply Voltage Range ±2.5V to ±17V ■ THD+N (AV = 1, VOUT = 3VRMS, fIN = 1kHz) RL = 2kΩ 0.00003% (typ) RL = 600Ω 0.00003% (typ) ■ Input Noise Density 2.5nV/√Hz (typ) ■ Slew Rate ±20V/μs (typ) ■ Gain Bandwidth Product 55MHz (typ) ■ Open Loop Gain (RL = 600Ω) 140dB (typ) ■ Input Bias Current ■ Input Offset Voltage ■ DC Gain Linearity Error 7nA (typ) 0.05mV (typ) 0.000009% Features ■ ■ ■ ■ ■ Easily drives 600Ω 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 www.national.com LME49710 High Performance, High Fidelity Audio Operational Amplifier March 2007 LME49710 Typical Application 20210406 FIGURE 1. Passively Equalized RIAA Phono Preamplifier www.national.com 2 LME49710 Connection Diagrams 20210402 Order Number LME49710MA See NS Package Number — M08A Order Number LME49710NA See NS Package Number — N08E Metal Can 20210405 Order Number LME49710HA See NS Package Number — H08C 3 www.national.com LME49710 ESD Susceptibility (Note 5) Junction Temperature Thermal Resistance 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 36V −65°C to 150°C Output Short Circuit (Note 3) Power Dissipation ESD Susceptibility (Note 4) θJA (SO) 145°C/W θJA (NA) 102°C/W θJA (HA) 150°C/W θJC (HA) Temperature Range (V-) - 0.7V to (V+) + 0.7V Continuous Internally Limited 2000V Electrical Characteristics 200V 150°C 35°C/W TMIN ≤ TA ≤ TMAX Supply Voltage Range –40°C ≤ TA ≤ 85°C ±2.5V ≤ VS ≤ ± 17V (Notes 1, 2) The following specifications apply for VS = ±15V, RL = 2kΩ, fIN = 1kHz, and TA = 25°C, unless otherwise specified. LME49710 Symbol Parameter Conditions Typical Limit (Note 6) (Notes 7, 8) 0.00003 0.00003 0.00009 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 IMD Intermodulation Distortion GBWP Gain Bandwidth Product 55 45 MHz (min) SR Slew Rate ±20 ±15 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 0.34 0.65 μVRMS Equivalent Input Noise Density f = 1kHz f = 10Hz 2.5 6.4 4.7 Current Noise Density f = 1kHz f = 10Hz 1.6 3.1 nV/√Hz nV/√Hz pA/√Hz pA/√Hz ±0.7 mV (max) en in VOS Offset Voltage PSRR Average Input Offset Voltage Shift vs ΔVS = 20V (Note 9) Power Supply Voltage IB Input Bias Current VCM = 0V ΔIOS/ΔTemp Input Bias Current Drift vs Temperature –40°C ≤ TA ≤ 85°C IOS Input Offset Current VCM = 0V CMRR ZIN AVOL www.national.com Open Loop Voltage Gain μs μV/°C 0.2 125 110 dB (min) 7 72 nA (max) 0.1 nA/°C 5 65 nA (max) (V+) – 2.0 (V-) + 2.0 V (min) V (min) –10V<VCM<10V 120 110 dB (min) 30 kΩ –10V<VCM<10V 1000 MΩ –10V<VOUT<10V, RL = 600Ω 140 dB –10V<VOUT<10V, RL = 2kΩ 140 –10V<VOUT<10V, RL = 10kΩ 140 Differential Input Impedance Common Mode Input Impedance MHz +14.1 –13.9 Common-Mode Input Voltage Range Common-Mode Rejection % (max) 10 ±0.05 Average Input Offset Voltage Drift vs ΔVOS/ΔTemp 40°C ≤ TA ≤ 85°C Temperature VIN-CM 0.00005 % (max) % (max) 4 125 dB dB Symbol Typical Limit (Note 6) (Notes 7, 8) RL = 600Ω ±13.6 ±12.5 RL = 2kΩ ±14.0 RL = 10kΩ ±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 16 IS Quiescent Current IOUT = 0mA 4.8 RL = 600Ω, VS = ±17V ±26 Units (Limits) V V V ±23 mA (min) +53 –42 mA mA 0.01 13 Ω Ω % 5.5 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)|. 5 www.national.com LME49710 LME49710 LME49710 Typical Performance Characteristics THD+N vs Output Voltage VCC = 15V, VEE = –15V, RL = 2kΩ THD+N vs Output Voltage VCC = 12V, VEE = –12V, RL = 2kΩ 20210473 20210476 THD+N vs Output Voltage VCC = 17V, VEE = –17V, RL = 2kΩ THD+N vs Output Voltage VCC = 2.5V, VEE = –2.5V, RL = 2kΩ 20210479 20210470 THD+N vs Output Voltage VCC = 15V, VEE = –15V, RL = 600Ω THD+N vs Output Voltage VCC = 12V, VEE = –12V, RL = 600Ω 20210478 www.national.com 20210475 6 LME49710 THD+N vs Output Voltage VCC = 17V, VEE = –17V, RL = 600Ω THD+N vs Output Voltage VCC = 2.5V, VEE = –2.5V, RL = 600Ω 20210481 20210472 THD+N vs Output Voltage VCC = 15V, VEE = –15V, RL = 10kΩ THD+N vs Output Voltage VCC = 12V, VEE = –12V, RL = 10kΩ 20210477 20210474 THD+N vs Output Voltage VCC = 17V, VEE = –17V, RL = 10kΩ THD+N vs Output Voltage VCC = 2.5V, VEE = –2.5V, RL = 10kΩ 20210480 20210471 7 www.national.com LME49710 THD+N vs Frequency VCC = 15V, VEE = –15V, RL = 2kΩ, VOUT = 3VRMS THD+N vs Frequency VCC = 17V, VEE = –17V, RL = 2kΩ, VOUT = 3VRMS 20210467 20210464 THD+N vs Frequency VCC = 15V, VEE = –15V, RL = 600Ω, VOUT = 3VRMS THD+N vs Frequency VCC = 17V, VEE = –17V, RL = 600Ω, VOUT = 3VRMS 20210466 20210469 THD+N vs Frequency VCC = 15V, VEE = –15V, RL = 10kΩ, VOUT = 3VRMS THD+N vs Frequency VCC = 17V, VEE = –17V, RL = 10kΩ, VOUT = 3VRMS 20210465 www.national.com 20210468 8 LME49710 IMD vs Output Voltage VCC = 15V, VEE = –15V, RL = 2kΩ IMD vs Output Voltage VCC = 12V, VEE = –12V, RL = 2kΩ 20210411 20210414 IMD vs Output Voltage VCC = 17V, VEE = –17V, RL = 2kΩ IMD vs Output Voltage VCC = 2.5V, VEE = –2.5V, RL = 2kΩ 20210417 20210408 IMD vs Output Voltage VCC = 15V, VEE = –15V, RL = 600Ω IMD vs Output Voltage VCC = 12V, VEE = –12V, RL = 600Ω 20210416 20210413 9 www.national.com LME49710 IMD vs Output Voltage VCC = 17V, VEE = –17V, RL = 600Ω IMD vs Output Voltage VCC = 2.5V, VEE = –2.5V, RL = 600Ω 20210419 20210410 IMD vs Output Voltage VCC = 15V, VEE = –15V, RL = 10kΩ IMD vs Output Voltage VCC = 12V, VEE = –12V, RL = 10kΩ 20210415 20210412 IMD vs Output Voltage VCC = 17V, VEE = –17V, RL = 10kΩ IMD vs Output Voltage VCC = 2.5V, VEE = –2.5V, RL = 10kΩ 20210418 www.national.com 20210409 10 LME49710 Voltage Noise Density vs Frequency Current Noise Density vs Frequency 20210489 20210490 PSRR+ vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 2kΩ, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 2kΩ, VRIPPLE = 200mVpp 20210491 20210420 PSRR+ vs Frequency VCC = 12V, VEE = –12V, RL = 2kΩ, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 12V, VEE = –12V, RL = 2kΩ, VRIPPLE = 200mVpp 20210494 20210455 11 www.national.com LME49710 PSRR+ vs Frequency VCC = 15V, VEE = –15V, RL = 2kΩ, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 15V, VEE = –15V, RL = 2kΩ, VRIPPLE = 200mVpp 20210497 20210425 PSRR+ vs Frequency VCC = 17V, VEE = –17V, RL = 2kΩ, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 17V, VEE = –17V, RL = 2kΩ, VRIPPLE = 200mVpp 202104a0 20210438 PSRR- vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 600Ω, VRIPPLE = 200mVpp PSRR+ vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 600Ω, VRIPPLE = 200mVpp 20210493 www.national.com 20210421 12 LME49710 PSRR+ vs Frequency VCC = 12V, VEE = –12V, RL = 600Ω, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 12V, VEE = –12V, RL = 600Ω, VRIPPLE = 200mVpp 20210496 20210424 PSRR+ vs Frequency VCC = 15V, VEE = –15V, RL = 600Ω, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 15V, VEE = –15V, RL = 600Ω, VRIPPLE = 200mVpp 20210499 20210451 PSRR- vs Frequency VCC = 17V, VEE = –17V, RL = 600Ω, VRIPPLE = 200mVpp PSRR+ vs Frequency VCC = 17V, VEE = –17V, RL = 600Ω, VRIPPLE = 200mVpp 202104a2 20210444 13 www.national.com LME49710 PSRR+ vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 10kΩ, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 10kΩ, VRIPPLE = 200mVpp 20210492 20210488 PSRR+ vs Frequency VCC = 12V, VEE = –12V, RL = 10kΩ, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 12V, VEE = –12V, RL = 10kΩ, VRIPPLE = 200mVpp 20210495 20210423 PSRR- vs Frequency VCC = 15V, VEE = –15V, RL = 10kΩ, VRIPPLE = 200mVpp PSRR+ vs Frequency VCC = 15V, VEE = –15V, RL = 10kΩ, VRIPPLE = 200mVpp 20210498 www.national.com 20210426 14 LME49710 PSRR+ vs Frequency VCC = 17V, VEE = –17V, RL = 10kΩ, VRIPPLE = 200mVpp PSRR- vs Frequency VCC = 17V, VEE = –17V, RL = 10kΩ, VRIPPLE = 200mVpp 202104a1 20210439 CMRR vs Frequency VCC = 15V, VEE = –15V, RL = 2kΩ CMRR vs Frequency VCC = 12V, VEE = –12V, RL = 2kΩ 202104b1 202104a8 CMRR vs Frequency VCC = 17V, VEE = –17V, RL = 2kΩ CMRR vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 2kΩ 202104b4 202104a5 15 www.national.com LME49710 CMRR vs Frequency VCC = 15V, VEE = –15V, RL = 600Ω CMRR vs Frequency VCC = 12V, VEE = –12V, RL = 600Ω 202104b3 202104b0 CMRR vs Frequency VCC = 17V, VEE = –17V, RL = 600Ω CMRR vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 600Ω 202104b6 202104a7 CMRR vs Frequency VCC = 15V, VEE = –15V, RL = 10kΩ CMRR vs Frequency VCC = 12V, VEE = –12V, RL = 10kΩ 202104b2 www.national.com 202104a9 16 LME49710 CMRR vs Frequency VCC = 17V, VEE = –17V, RL = 10kΩ CMRR vs Frequency VCC = 2.5V, VEE = –2.5V, RL = 10kΩ 202104b5 202104a6 Output Voltage vs Supply Voltage RL = 2kΩ, THD+N = 1% Output Voltage vs Supply Voltage RL = 600Ω, THD+N = 1% 20210485 20210487 Output Voltage vs Supply Voltage RL = 10kΩ, THD+N = 1% Output Voltage vs Load Resistance VCC = 15V, VEE = –15V, THD+N = 1% 20210483 20210486 17 www.national.com LME49710 Output Voltage vs Load Resistance VCC = 17V, VEE = –17V, THD+N = 1% Output Voltage vs Load Resistance VCC = 2.5V, VEE = –2.5V, THD+N = 1% 20210484 20210482 Small-Signal Transient Response AV = –1, CL = 100pF Large-Signal Transient Response AV = –1, CL = 100pF 202104a3 202104a4 www.national.com 18 The LME49710 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 20210427 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 = V O/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 20210429 20210428 19 www.national.com LME49710 Capacitive loads greater than 100pF must be isolated from the output. The most straight forward 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 LME49710 Typical Applications NAB Preamp NAB Preamp Voltage Gain vs Frequency VIN = 10mV, 34.5dB, f = 1kHz 20210431 20210430 AV = 34.5 F = 1 kHz En = 0.38 μV A Weighted Balanced to Single Ended Converter Adder/Subtracter 20210433 VO = V1 + V2 − V3 − V4 20210432 VO = V1–V2 Sine Wave Oscillator 20210434 www.national.com 20 LME49710 Second Order High Pass Filter (Butterworth) Second Order Low Pass Filter (Butterworth) 20210435 20210436 Illustration is f0 = 1 kHz Illustration is f0 = 1 kHz State Variable Filter 20210437 21 www.national.com LME49710 Line Driver 20210440 Tone Control 20210441 20210442 www.national.com 22 LME49710 RIAA Preamp 20210403 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 20210443 Illustration is: V0 = 101(V2 − V1) 23 www.national.com LME49710 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 DISTORTION MEASUREMENTS The vanishingly low residual distortion produced by LME49710 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 LME49710’s low residual distortion is an input referred internal error. As shown in Figure 2, adding the 10Ω resistor connected between the amplifier’s inverting and non-inverting 20210407 FIGURE 2. THD+N and IMD Distortion Test Circuit www.national.com 24 LME49710 Revision History Rev Date 1.0 11/16/07 Initial release. 1.1 12/12/06 Added the Typical Performance curves. 1.2 01/15/07 Added more curves and input some text edits. 1.3 03/09/07 Fixed graphics 20210489 and 90. 25 Description www.national.com LME49710 Physical Dimensions inches (millimeters) unless otherwise noted Dual-In-Line Package Order Number LME49710MA NS Package Number M08A Dual-In-Line Package Order Number LME49710NA NS Package Number N08E www.national.com 26 LME49710 TO-99 Metal Can Order Number LME49710HA NS Package Number H08C 27 www.national.com LME49710 High Performance, High Fidelity 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. 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