March 2007
LME49710
High Performance, High Fidelity Audio Operational
Amplifier
General Description
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 opera-
tional amplifiers deliver superior audio signal amplification for
outstanding audio performance. The LME49710 combines
extremely low voltage noise density (2.5nV/Hz) with vanish-
ingly low THD+N (0.00003%) to easily satisfy the most de-
manding 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 max-
imized 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 main-
tains 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.
Key Specifications
■ Power Supply Voltage Range ±2.5V to ±17V
■ THD+N (AV = 1, VOUT = 3VRMS, fIN = 1kHz)
RL = 2kΩ0.00003% (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 7nA (typ)
■ Input Offset Voltage 0.05mV (typ)
■ DC Gain Linearity Error 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
© 2007 National Semiconductor Corporation 202104 www.national.com
LME49710 High Performance, High Fidelity Audio Operational Amplifier
Typical Application
20210406
FIGURE 1. Passively Equalized RIAA Phono Preamplifier
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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
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LME49710
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-)36V
Storage Temperature −65°C to 150°C
Input Voltage (V-) - 0.7V to (V+) + 0.7V
Output Short Circuit (Note 3) Continuous
Power Dissipation Internally Limited
ESD Susceptibility (Note 4) 2000V
ESD Susceptibility (Note 5) 200V
Junction Temperature 150°C
Thermal Resistance
θJA (SO) 145°C/W
θJA (NA) 102°C/W
θJA (HA) 150°C/W
θJC (HA) 35°C/W
Temperature Range
TMIN ≤ TA ≤ TMAX –40°C ≤ TA ≤ 85°C
Supply Voltage Range ±2.5V ≤ VS ≤ ± 17V
Electrical Characteristics (Notes 1, 2)
The following specifications apply for VS = ±15V, RL = 2kΩ, fIN = 1kHz, and TA = 25°C, unless otherwise specified.
Symbol Parameter Conditions
LME49710 Units
(Limits)
Typical Limit
(Note 6) (Notes 7, 8)
THD+N Total Harmonic Distortion + Noise
AV = 1, VOUT = 3VRMS
RL = 2kΩ
RL = 600Ω
0.00003
0.00003 0.00009
% (max)
% (max)
IMD Intermodulation Distortion AV = 1, VOUT = 3VRMS
Two-tone, 60Hz & 7kHz 4:1 0.00005 % (max)
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
10
MHz
tsSettling time AV = 1, 10V step, CL = 100pF
0.1% error range 1.2
μs
en
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 nV/√Hz
nV/√Hz
inCurrent Noise Density f = 1kHz
f = 10Hz
1.6
3.1
pA/√Hz
pA/√Hz
VOS Offset Voltage ±0.05 ±0.7 mV (max)
ΔVOS/ΔTemp Average Input Offset Voltage Drift vs
Temperature 40°C ≤ TA ≤ 85°C 0.2 μV/°C
PSRR Average Input Offset Voltage Shift vs
Power Supply Voltage ΔVS = 20V (Note 9) 125 110 dB (min)
IBInput Bias Current VCM = 0V 7 72 nA (max)
ΔIOS/ΔTemp Input Bias Current Drift vs
Temperature –40°C ≤ TA ≤ 85°C 0.1 nA/°C
IOS Input Offset Current VCM = 0V 5 65 nA (max)
VIN-CM
Common-Mode Input Voltage Range +14.1
–13.9
(V+) – 2.0
(V-) + 2.0
V (min)
V (min)
CMRR Common-Mode Rejection –10V<VCM<10V 120 110 dB (min)
ZIN
Differential Input Impedance 30 kΩ
Common Mode Input Impedance –10V<VCM<10V 1000 MΩ
AVOL Open Loop Voltage Gain
–10V<VOUT<10V, RL = 600Ω 140 dB
–10V<VOUT<10V, RL = 2kΩ140 125 dB
–10V<VOUT<10V, RL = 10kΩ140 dB
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LME49710
Symbol Parameter Conditions
LME49710 Units
(Limits)
Typical Limit
(Note 6) (Notes 7, 8)
VOUTMAX Maximum Output Voltage Swing
RL = 600Ω ±13.6 ±12.5 V
RL = 2kΩ±14.0 V
RL = 10kΩ±14.1 V
IOUT Output Current RL = 600Ω, VS = ±17V ±26 ±23 mA (min)
IOUT-CC Short Circuit Current +53
–42
mA
mA
ROUT Output Impedance
fIN = 10kHz
Closed-Loop
Open-Loop
0.01
13
Ω
Ω
CLOAD Capacitive Load Drive Overshoot 100pF 16 %
ISQuiescent Current IOUT = 0mA 4.8 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)|.
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LME49710
Typical Performance Characteristics
THD+N vs Output Voltage
VCC = 15V, VEE = –15V, RL = 2kΩ
20210476
THD+N vs Output Voltage
VCC = 12V, VEE = –12V, RL = 2kΩ
20210473
THD+N vs Output Voltage
VCC = 17V, VEE = –17V, RL = 2kΩ
20210479
THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V, RL = 2kΩ
20210470
THD+N vs Output Voltage
VCC = 15V, VEE = –15V, RL = 600Ω
20210478
THD+N vs Output Voltage
VCC = 12V, VEE = –12V, RL = 600Ω
20210475
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LME49710
THD+N vs Output Voltage
VCC = 17V, VEE = –17V, RL = 600Ω
20210481
THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V, RL = 600Ω
20210472
THD+N vs Output Voltage
VCC = 15V, VEE = –15V, RL = 10kΩ
20210477
THD+N vs Output Voltage
VCC = 12V, VEE = –12V, RL = 10kΩ
20210474
THD+N vs Output Voltage
VCC = 17V, VEE = –17V, RL = 10kΩ
20210480
THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V, RL = 10kΩ
20210471
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LME49710
THD+N vs Frequency
VCC = 15V, VEE = –15V,
RL = 2kΩ, VOUT = 3VRMS
20210464
THD+N vs Frequency
VCC = 17V, VEE = –17V,
RL = 2kΩ, VOUT = 3VRMS
20210467
THD+N vs Frequency
VCC = 15V, VEE = –15V,
RL = 600Ω, VOUT = 3VRMS
20210466
THD+N vs Frequency
VCC = 17V, VEE = –17V,
RL = 600Ω, VOUT = 3VRMS
20210469
THD+N vs Frequency
VCC = 15V, VEE = –15V,
RL = 10kΩ, VOUT = 3VRMS
20210465
THD+N vs Frequency
VCC = 17V, VEE = –17V,
RL = 10kΩ, VOUT = 3VRMS
20210468
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LME49710
IMD vs Output Voltage
VCC = 15V, VEE = –15V, RL = 2kΩ
20210414
IMD vs Output Voltage
VCC = 12V, VEE = –12V, RL = 2kΩ
20210411
IMD vs Output Voltage
VCC = 17V, VEE = –17V, RL = 2kΩ
20210417
IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V, RL = 2kΩ
20210408
IMD vs Output Voltage
VCC = 15V, VEE = –15V, RL = 600Ω
20210416
IMD vs Output Voltage
VCC = 12V, VEE = –12V, RL = 600Ω
20210413
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LME49710
IMD vs Output Voltage
VCC = 17V, VEE = –17V, RL = 600Ω
20210419
IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V, RL = 600Ω
20210410
IMD vs Output Voltage
VCC = 15V, VEE = –15V, RL = 10kΩ
20210415
IMD vs Output Voltage
VCC = 12V, VEE = –12V, RL = 10kΩ
20210412
IMD vs Output Voltage
VCC = 17V, VEE = –17V, RL = 10kΩ
20210418
IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V, RL = 10kΩ
20210409
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LME49710
Voltage Noise Density vs Frequency
20210490
Current Noise Density vs Frequency
20210489
PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 2kΩ, VRIPPLE = 200mVpp
20210491
PSRR- vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 2kΩ, VRIPPLE = 200mVpp
20210420
PSRR+ vs Frequency
VCC = 12V, VEE = –12V,
RL = 2kΩ, VRIPPLE = 200mVpp
20210494
PSRR- vs Frequency
VCC = 12V, VEE = –12V,
RL = 2kΩ, VRIPPLE = 200mVpp
20210455
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LME49710
PSRR+ vs Frequency
VCC = 15V, VEE = –15V,
RL = 2kΩ, VRIPPLE = 200mVpp
20210497
PSRR- vs Frequency
VCC = 15V, VEE = –15V,
RL = 2kΩ, VRIPPLE = 200mVpp
20210425
PSRR+ vs Frequency
VCC = 17V, VEE = –17V,
RL = 2kΩ, VRIPPLE = 200mVpp
202104a0
PSRR- vs Frequency
VCC = 17V, VEE = –17V,
RL = 2kΩ, VRIPPLE = 200mVpp
20210438
PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 600Ω, VRIPPLE = 200mVpp
20210493
PSRR- vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 600Ω, VRIPPLE = 200mVpp
20210421
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LME49710
PSRR+ vs Frequency
VCC = 12V, VEE = –12V,
RL = 600Ω, VRIPPLE = 200mVpp
20210496
PSRR- vs Frequency
VCC = 12V, VEE = –12V,
RL = 600Ω, VRIPPLE = 200mVpp
20210424
PSRR+ vs Frequency
VCC = 15V, VEE = –15V,
RL = 600Ω, VRIPPLE = 200mVpp
20210499
PSRR- vs Frequency
VCC = 15V, VEE = –15V,
RL = 600Ω, VRIPPLE = 200mVpp
20210451
PSRR+ vs Frequency
VCC = 17V, VEE = –17V,
RL = 600Ω, VRIPPLE = 200mVpp
202104a2
PSRR- vs Frequency
VCC = 17V, VEE = –17V,
RL = 600Ω, VRIPPLE = 200mVpp
20210444
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LME49710
PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 10kΩ, VRIPPLE = 200mVpp
20210492
PSRR- vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 10kΩ, VRIPPLE = 200mVpp
20210488
PSRR+ vs Frequency
VCC = 12V, VEE = –12V,
RL = 10kΩ, VRIPPLE = 200mVpp
20210495
PSRR- vs Frequency
VCC = 12V, VEE = –12V,
RL = 10kΩ, VRIPPLE = 200mVpp
20210423
PSRR+ vs Frequency
VCC = 15V, VEE = –15V,
RL = 10kΩ, VRIPPLE = 200mVpp
20210498
PSRR- vs Frequency
VCC = 15V, VEE = –15V,
RL = 10kΩ, VRIPPLE = 200mVpp
20210426
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LME49710
PSRR+ vs Frequency
VCC = 17V, VEE = –17V,
RL = 10kΩ, VRIPPLE = 200mVpp
202104a1
PSRR- vs Frequency
VCC = 17V, VEE = –17V,
RL = 10kΩ, VRIPPLE = 200mVpp
20210439
CMRR vs Frequency
VCC = 15V, VEE = –15V,
RL = 2kΩ
202104b1
CMRR vs Frequency
VCC = 12V, VEE = –12V,
RL = 2kΩ
202104a8
CMRR vs Frequency
VCC = 17V, VEE = –17V,
RL = 2kΩ
202104b4
CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 2kΩ
202104a5
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LME49710
CMRR vs Frequency
VCC = 15V, VEE = –15V,
RL = 600Ω
202104b3
CMRR vs Frequency
VCC = 12V, VEE = –12V,
RL = 600Ω
202104b0
CMRR vs Frequency
VCC = 17V, VEE = –17V,
RL = 600Ω
202104b6
CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 600Ω
202104a7
CMRR vs Frequency
VCC = 15V, VEE = –15V,
RL = 10kΩ
202104b2
CMRR vs Frequency
VCC = 12V, VEE = –12V,
RL = 10kΩ
202104a9
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LME49710
CMRR vs Frequency
VCC = 17V, VEE = –17V,
RL = 10kΩ
202104b5
CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V,
RL = 10kΩ
202104a6
Output Voltage vs Supply Voltage
RL = 2kΩ, THD+N = 1%
20210485
Output Voltage vs Supply Voltage
RL = 600Ω, THD+N = 1%
20210487
Output Voltage vs Supply Voltage
RL = 10kΩ, THD+N = 1%
20210486
Output Voltage vs Load Resistance
VCC = 15V, VEE = –15V, THD+N = 1%
20210483
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LME49710
Output Voltage vs Load Resistance
VCC = 17V, VEE = –17V, THD+N = 1%
20210484
Output Voltage vs Load Resistance
VCC = 2.5V, VEE = –2.5V, THD+N = 1%
20210482
Small-Signal Transient Response
AV = –1, CL = 100pF
202104a4
Large-Signal Transient Response
AV = –1, CL = 100pF
202104a3
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LME49710
Application Hints
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.
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 pre-
vent excess power dissipation if the output is accidentally
shorted.
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
20210428
Flat Amp Voltage Gain vs Frequency
VO = 0dB, AV = 80.0dB, f = 1kHz
20210429
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LME49710
Typical Applications
NAB Preamp
20210430
AV = 34.5
F = 1 kHz
En = 0.38 μV
A Weighted
NAB Preamp Voltage Gain vs Frequency
VIN = 10mV, 34.5dB, f = 1kHz
20210431
Balanced to Single Ended Converter
20210432
VO = V1–V2
Adder/Subtracter
20210433
VO = V1 + V2 − V3 − V4
Sine Wave Oscillator
20210434
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LME49710
Second Order High Pass Filter
(Butterworth)
20210435
Illustration is f0 = 1 kHz
Second Order Low Pass Filter
(Butterworth)
20210436
Illustration is f0 = 1 kHz
State Variable Filter
20210437
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LME49710
Line Driver
20210440
Tone Control
20210441
20210442
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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)
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LME49710
Application Information
DISTORTION MEASUREMENTS
The vanishingly low residual distortion produced by
LME49710 is below the capabilities of all commercially avail-
able equipment. This makes distortion measurements just
slightly more difficult than simply connecting a distortion me-
ter to the amplifier’s inputs and outputs. The solution, how-
ever, 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
inputs changes the amplifier’s noise gain. The result is that
the error signal (distortion) is amplified by a factor of 101. Al-
though the amplifier’s closed-loop gain is unaltered, the feed-
back 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 compo-
nents that are within the measurement equipment’s capabili-
ties. This datasheet’s THD+N and IMD values were generat-
ed using the above described circuit connected to an Audio
Precision System Two Cascade.
20210407
FIGURE 2. THD+N and IMD Distortion Test Circuit
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LME49710
Revision History
Rev Date Description
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.
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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
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LME49710
TO-99 Metal Can
Order Number LME49710HA
NS Package Number H08C
27 www.national.com
LME49710
Notes
LME49710 High Performance, High Fidelity Audio Operational Amplifier
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