LME49723 Dual High Fidelity Audio Operational Amplifier RL = 600Ω General Description The LME49723 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 LME49723 audio operational amplifiers deliver superior audio signal amplification for outstanding audio performance. The LME49723 combines extremely low voltage noise density (3.6nV/√Hz) with vanishingly low THD+N (0.0002%) to easily satisfy the most demanding audio applications. To ensure that the most challenging loads are driven without compromise, the LME49723 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 LME49723's outstanding CMRR (100dB), PSRR (100dB), and VOS (0.3mV) give the amplifier excellent operational amplifier DC performance. The LME49723 has a wide supply range of ±2.5V to ±17V. Over this supply range the LME49723’s input circuitry maintains excellent common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49723 is unity gain stable. The LME49723 is available in an 8–lead narrow body SOIC. Demonstration boards are available for each package. Key Specifications ■ Power Supply Voltage Range ±2.5V to ±17V ■ ■ Input Noise Density 0.0002% (typ) 3.6nV/√Hz (typ) ■ Slew Rate ±8V/μs (typ) ■ Gain Bandwidth Product 17MHz (typ) ■ Open Loop Gain (RL = 600Ω) 105dB (typ) ■ Input Bias Current 200nA (typ) ■ Input Offset Voltage 0.3mV (typ) Features ■ ■ ■ ■ ■ Easily drives 600Ω loads Optimized for superior audio signal fidelity Output short circuit protection PSRR and CMRR exceed 100dB (typ) SOIC package Applications ■ ■ ■ ■ ■ ■ ■ ■ ■ High quality audio amplification High fidelity preamplifiers High fidelity multimedia 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) RL = 2kΩ 0.0002% (typ) Typical Application 300362k5 Passively Equalized RIAA Phono Preamplifier © 2008 National Semiconductor Corporation 300362 www.national.com LME49723 Dual High Fidelity Audio Operational Amplifier January 7, 2008 LME49723 Connection Diagram 30036255 Order Number LME49723MA See NS Package Number — M08A 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 36V −65°C to 150°C Output Short Circuit (Note 3) Internally Limited 800V 180V 150°C 145°C/W TMIN ≤ TA ≤ TMAX Supply Voltage Range (V-) - 0.7V to (V+) + 0.7V Continuous Electrical Characteristics for the LME49723 (Notes 1, 2) –40°C ≤ TA ≤ 85°C ±2.5V ≤ VS ≤ ± 17V The specifications apply for VS = ±7V, RL = 2kΩ, fIN = 1kHz, TA = 25°C, unless otherwise specified. LME49723 Symbol Parameter Conditions Typical Limit (Note 6) (Note 7) 0.0002 0.0002 0.0004 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 % (max) IMD Intermodulation Distortion 0.0005 % GBWP Gain Bandwidth Product 19 15 MHz (min) SR Slew Rate ±8 ±6 V/μs (min) Full Power Bandwidth VOUT = 1VP-P, –3dB referenced to output magnitude at f = 1kHz Equivalent Input Noise Voltage fBW = 20Hz to 20kHz 0.45 0.65 μVRMS Equivalent Input Noise Density f = 1kHz f = 10Hz 3.2 8.5 5 nV/√Hz in Current Noise Density f = 1kHz f = 10Hz 0.7 1.3 VOS Offset Voltage FPBW 4 (max) en ±0.3 Average Input Offset Voltage Drift vs ΔVOS/ΔTemp –40°C ≤ TA ≤ 85°C Temperature 0.2 PSRR Average Input Offset Voltage Shift vs ΔVS = 20V (Note 8) Power Supply Voltage 100 ISOCH-CH Channel-to-Channel Isolation fIN = 1kHz fIN = 20kHz 118 112 IB Input Bias Current VCM = 0V 200 ΔIOS/ΔTemp Input Bias Current Drift vs Temperature –40°C ≤ TA ≤ 85°C 0.1 IOS Input Offset Current VCM = 0V VIN-CM Common-Mode Input Voltage Range CMRR Common-Mode Rejection ZIN AVOL MHz Open Loop Voltage Gain pA/√Hz 1 mV (max) μV/°C 95 dB (min) dB 300 nA (max) nA/°C 7 100 nA (max) ±14 (V+) – 2.0 (V-) + 2.0 V (min) –10V<Vcm<10V 100 90 dB (min) –10V<Vcm<10V 1000 –10V<Vout<10V, RL = 600Ω 100 –10V<Vout<10V, RL = 2kΩ 105 –10V<Vout<10V, RL = 10kΩ 105 Differential Input Impedance Common Mode Input Impedance (max) 30 3 kΩ MΩ 98 dB (min) www.national.com LME49723 Power Dissipation ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Thermal Resistance Absolute Maximum Ratings (Notes 1, 2) LME49723 LME49723 Symbol Typical Limit (Note 6) (Note 7) RL = 600Ω ±13.5 ±12.5 RL = 2kΩ ±14.0 RL = 10kΩ ±14.1 Parameter Conditions VOUTMAX Maximum Output Voltage Swing IOUT Output Current 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 6.7 RL = 600Ω, VS = ±17V ±25 Units (Limits) V (min) ±21 +53 –42 mA (min) mA Ω 0.01 13 % 7.5 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: PSRR is measured as follows: VOS is measured at two supply voltages, ±5V and ±15V. PSRR = | 20log(ΔVOS/ΔVS) |. www.national.com 4 LME49723 Typical Performance Characteristics THD+N vs Output Voltage VS = ±5V, RL = 2kΩ THD+N vs Output Voltage VS = ±5V, RL = 10kΩ 30036281 30036282 THD+N vs Output Voltage VS = ±5V, RL = 600Ω THD+N vs Output Voltage VS = ±15V, RL = 2kΩ 30036284 30036283 THD+N vs Output Voltage VS = ±15V, RL = 10kΩ THD+N vs Output Voltage VS = ±15V, RL = 600Ω 30036285 30036286 5 www.national.com LME49723 THD+N vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 2kΩ THD+N vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 10kΩ 30036288 30036287 THD+N vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 600Ω PSRR+ vs Frequency VS = ±15V, RL = 2kΩ, VRIPPLE = 200mVPP 30036289 30036272 PSRR+ vs Frequency VS = ±5V, RL = 10kΩ, VRIPPLE = 200mVPP PSRR+ vs Frequency VS = ±5V, RL = 600Ω, VRIPPLE = 200mVPP 30036273 www.national.com 30036274 6 PSRR+ vs Frequency VS = ±15V, RL = 10kΩ, VRIPPLE = 200mVPP 30036275 30036276 PSRR+ vs Frequency VS = ±15V, RL = 600Ω, VRIPPLE = 200mVPP PSRR- vs Frequency VS = ±5V, RL = 2kΩ, VRIPPLE = 200mVPP 30036277 30036266 PSRR- vs Frequency VS = ±5V, RL = 10kΩ, VRIPPLE = 200mVPP PSRR- vs Frequency VS = ±5V, RL = 600Ω, VRIPPLE = 200mVPP 30036267 30036268 7 www.national.com LME49723 PSRR+ vs Frequency VS = ±15V, RL = 2kΩ, VRIPPLE = 200mVPP LME49723 PSRR- vs Frequency VS = ±15V, RL = 2kΩ, VRIPPLE = 200mVPP PSRR- vs Frequency VS = ±15V, RL = 10kΩ, VRIPPLE = 200mVPP 30036270 30036269 PSRR- vs Frequency VS = ±15V, RL = 10kΩ, VRIPPLE = 200mVPP CMRR vs Frequency VS = ±15V, RL = 2kΩ, VIN = 200mVPP 300362r4 30036271 CMRR vs Frequency VS = ±15V, RL = 10kΩ, VIN = 200mVPP CMRR vs Frequency VS = ±15V, RL = 600Ω, VIN = 200mVPP 30036256 www.national.com 30036257 8 LME49723 Crosstalk vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 2kΩ, Crosstalk vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 10kΩ, 30036259 30036258 Crosstalk vs Frequency VS = ±15V, VOUT = 3VRMS, RL = 600Ω, IMD vs Output Voltage VS = ±5V, RL = 2kΩ, 30036260 30036290 IMD vs Output Voltage VS = ±5V, RL = 10kΩ, IMD vs Output Voltage VS = ±5V, RL = 600Ω, 30036291 30036292 9 www.national.com LME49723 Output Voltage vs Load Resistance VS = ±5V, THD+N = 1% Output Voltage vs Load Resistance VDD = 15V, VSS = –15V, THD+N = 0.1% 30036262 30036261 Output Voltage vs Supply Voltage RL = 2kΩ, THD+N = 0.1% Output Voltage vs Supply Voltage RL = 10kΩ, THD+N = 0.1% 30036264 30036263 Output Voltage vs Supply Voltage RL = 600Ω, THD+N = 1% Supply Current vs Supply Voltage RL = 2kΩ 30036265 www.national.com 30036278 10 LME49723 Supply Current vs Supply Voltage RL = 10kΩ Supply Current vs Supply Voltage RL = 600Ω 30036279 30036280 Noninverting Amp Noninverting Amp 30036224 30036225 Inverting Amp Voltage Gain & Phase vs Frequency 30036226 30036210 11 www.national.com LME49723 Power Bandwidth Equivalent Input Noise vs Frequency 30036215 30036204 www.national.com 12 DISTORTION MEASUREMENTS The vanishingly low residual distortion produced by LME49723 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 LME49723’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 300362k4 FIGURE 1. THD+N and IMD Distortion Test Circuit 13 www.national.com LME49723 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 LME49723 The LME49723 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. 30036227 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 30036228 www.national.com 30036229 14 LME49723 TYPICAL APPLICATIONS Balanced to Single Ended Converter Adder/Subtracter 30036233 VO = V1 + V2 − V3 − V4 30036232 VO = V1–V2 Sine Wave Oscillator 30036234 Second Order High Pass Filter (Butterworth) Second Order Low Pass Filter (Butterworth) 30036235 30036236 Illustration is f0 = 1 kHz Illustration is f0 = 1 kHz 15 www.national.com LME49723 State Variable Filter 30036237 Illustration is f0 = 1 kHz, Q = 10, ABP = 1 AC/DC Converter 30036238 www.national.com 16 LME49723 2 Channel Panning Circuit (Pan Pot) Line Driver 30036239 30036240 17 www.national.com LME49723 Tone Control 30036241 Illustration is: fL = 32 Hz, fLB = 320 Hz fH =11 kHz, fHB = 1.1 kHz 30036242 RIAA Preamp 30036203 Av = 35 dB En = 0.33 μV S/N = 90 dB f = 1 kHz A Weighted A Weighted, VIN = 10 mV @f = 1 kHz www.national.com 18 LME49723 Balanced Input Mic Amp 30036243 Illustration is: V0 = 101(V2 − V1) 19 www.national.com LME49723 10 Band Graphic Equalizer 30036244 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 9: At volume of change = ±12 dB Q = 1.7 Reference: “AUDIO/RADIO HANDBOOK”, National Semiconductor, 1980, Page 2–61 www.national.com 20 LME49723 Revision History Rev Date 1.0 01/07/08 Description Initial release. 21 www.national.com LME49723 Physical Dimensions inches (millimeters) unless otherwise noted Narrow SOIC Package Order Number LME49723MA NS Package Number M08A www.national.com 22 LME49723 Notes 23 www.national.com LME49723 Dual 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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