March 27, 2008
LME49722
Low Noise, High Performance, High Fidelity Dual Audio
Operational Amplifier
General Description
The LME49722 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 LME49722 audio opera-
tional amplifiers deliver superior audio signal amplification for
outstanding audio performance. The LME49722 combines
extremely low voltage noise density (1.9nV/√Hz) rate with
vanishingly low THD+N (0.00002%) to easily satisfy the most
demanding audio applications. To ensure that the most chal-
lenging loads are driven without compromise, the LME49722
has a high slew rate of ±22V/µs and an output current capa-
bility of ±28mA. Further, dynamic range is maximized by an
output stage that drives 2kΩ loads to within 1V of either power
supply voltage.
The LME49722 has a wide supply range of ±2.5V to ±18V.
Over this supply range the LME49722 maintains excellent
common-mode and power supply rejection, and low input bias
current. This Audio Operational Amplifier achieves outstand-
ing AC performance while driving complex loads with values
as high as 100pF with gain value greater than 2. Directly in-
terchangeable with LME49720, LM4562 and LME49860 for
similar operating voltages.
Key Specifications
■ Wide Operating Voltage Range ±2.5V to ±18V
■ Equivalent Noise
(Frequency = 1kHz) 1.9nV/√Hz (typ)
■ Equivalent Noise
(Frequency = 10Hz) 2.8nV/√Hz (typ)
■ PSRR 120dB (typ)
■ Slew Rate ±22V/μs (typ)
■ THD+N
(AV = 1, VOUT = 3VRMS, fIN = 1kHz)
RL = 2kΩ0.00002% (typ)
RL = 600Ω 0.00002% (typ)
■ Open Loop Gain (RL = 600Ω) 135dB (typ)
■ Input Bias Current 50nA (typ)
■ Voltage Offset ±0.02mV (typ)
Features
■Easily drives 600Ω loads
■Optimized for superior audio signal fidelity
■Output short circuit protection
■PSRR and CMRR exceed 120dB (typ)
Applications
■Ultra high quality audio amplification
■High fidelity preamplifiers, phono preamps, and
multimedia
■High performance professional audio
■High fidelity equalization and crossover networks with
active filters
■High performance line drivers and receivers
■Low noise industrial applications including test,
measurement, and ultrasound
Typical Application
30057910
FIGURE 1. Wide Bandwidth Low Noise Low Drift Amplifier
© 2008 National Semiconductor Corporation 300579 www.national.com
LME49722 Low Noise, High Performance, High Fidelity Dual Audio Operational Amplifier
Connection Diagram
30057955
Order Number LME49722MA
See NS Package Number — M08A
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LME49722
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.
Supply Voltage (VS = VCC-VEE)38V
Storage Temperature −65°C to 150°C
Input Voltage (V-) - 0.7V to (V+) + 0.7V
Output Short Circuit (Note 3) Continuous
ESD Susceptibility (Note 4) 2000V
ESD Susceptibility (Note 5) 200V
Junction Temperature (TJMAX)150°C
Thermal Resistance
θJA 154°C/W
θJC 27°C/W
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX −40°C ≤ TA ≤ 85°C
Supply Voltage Range ±2.5V ≤ VS ≤ ±18V
Electrical Characteristics for the LME49722 (Notes 1, 2) The following specifications apply for
VS = ±15V and ±18V, RL = 2kΩ, fIN = 1kHz unless otherwise specified. Limits apply for TA = 25°C,
Symbol Parameter Conditions
LME49722 Units
(Limits)
Typical Limit
(Note 6) (Note 7)
THD+N Total Harmonic Distortion + Noise
AV = 1, VOUT = 3Vrms
RL = 2kΩ
RL = 600Ω
0.00002
0.00002 0.00009
%
% (max)
IMD Intermodulation Distortion AV = 1, VOUT = 3VRMS
Two-tone, 60Hz & 7kHz 4:1 0.00002 %
GBWP Gain Bandwidth Product fIN = 100kHz 55 45 MHz (min)
SR Slew Rate AV = 1, VOUT = 10VP-P ±22 ±15 V/μs (min)
FPBW Full Power Bandwidth
VOUT = 1VP-P, –3dB
referenced to output magnitude
at f = 1kHz
12
MHz
tsSettling time AV = –1, 10V step, CL = 100pF
0.1% error range 1.2 μs
eINV Equivalent Input Voltage Noise fBW = 20Hz to 20kHz 0.25 0.35 μVRMS (max)
eNEquivalent Input Voltage Density
f= 1kHz
VS = ±15V
VS = ±18V
1.9
1.9 2.5
nV√Hz
nV√Hz (max)
f = 10Hz
VS = ±15V
VS = ±18V
2.8
3.2
nV√Hz
nV√Hz
InCurrent Noise Density f = 1kHz
f = 10Hz
2.6
6 pA/√Hz
pA/√Hz
VOS Offset Voltage VCM = 0V ±0.02 ±0.7 mV (max)
PSRR Power Supply Rejection Ratio ΔVS = 20V (Note 8) 120 110 dB (min)
ISOCH-CH Channel-to-Channel Isolation fIN = 1kHz
fIN = 20kHz
136
135
dB
dB
IBInput Bias Current
VCM = 0V
VS = ±15V
VS = ±18V
50
53 200
nA
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
VS = ±15V
VS = ±18V
25
32 100
nA
nA (max)
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LME49722
Symbol Parameter Conditions
LME49722 Units
(Limits)
Typical Limit
(Note 6) (Note 7)
VIN-CM
Common-Mode Input Voltage
Range
VS = ±15V +14.0
–13.9
(VCC) – 2.0
(VEE) + 2.0
V (min)
V (min)
VS = ±18V +17.0
–16.9
(VCC) – 2.0
(VEE) + 2.0
V (min)
V (min)
CMRR Common-Mode Rejection –10V ≤ VCM ≤ 10V 128 110 dB (min)
ZIN Differential Input Impedance 30 kΩ
ZCM Common Mode Input Impedance –10V ≤ VCM ≤ 10V 1000 MΩ
AVOL Open Loop Voltage Gain
–12V ≤ VOUT ≤ 12V, RL = 600Ω
–12V ≤ VOUT ≤ 12V, RL = 2kΩ
–12V ≤ VOUT ≤ 12V, RL = 10kΩ
135
140
140
120 dB
dB
dB
VOM Output Voltage Swing
VS = ±15V
RL = 600Ω
RL = 2kΩ
RL = 10kΩ
+13.7/–14
±14.0
±14.1
VPEAK
VPEAK
VPEAK
VS = ±18V
RL = 600Ω
RL = 2kΩ
RL = 10kΩ
+16.6/–16.8
±17.0
±17.1
±15.5 VPEAK (min)
VPEAK
VPEAK
IOUT Output Current
RL = 600Ω
VS = ±15V
VS = ±18V
±23
±27.6/–28 ±23
mA
mA (min)
IOUT-CC Short Circuit Current Sink to Source +43
–40 mA
mA
ZOUT Output Impedance
fIN = 10kHz
Closed-Loop
Open-Loop
0.01
13
Ω
Ω
IS
Total Quiescent Power Supply
Current
IOUT = 0mA
VS = ±15V
VS = ±18V
12.1
12.3 16
mA
mA (max)
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the
device should not be operated beyond such conditions. All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum
allowable power dissipation is PDMAX = (TJMAX - TA) / θJA or the number given inAbsolute Maximum Ratings, whichever is lower. For the LME49722, TJMAX = 150°
C and the typical θJC is 27°C/W.
Note 4: Human body model, applicable std. JESD22-A114C.
Note 5: Machine model, applicable std. JESD22-A115-A.
Note 6: Typical values represent most likely parametric norms at TA = +25°C, and at the Recommended Operation Conditions at the time of product
characterization and are not guaranteed.
Note 7: Datasheet min/max specification limits are guaranteed by test or statistical analysis.
Note 8: PSRR is measured as follow: VOS is measured at two supply voltages, ±5V and ±15V. PSRR = | 20log(ΔVOS/ΔVS) |.
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LME49722
Typical Performance Characteristics
THD+N vs Output Voltage
+VCC = –VEE = 15V, fIN = 1kHz, RL = 2kΩ
300579p5
THD+N vs Output Voltage
+VCC = –VEE = 15V, fIN = 1kHz, RL = 600Ω
300579p6
THD+N vs Output Voltage
+VCC = –VEE = 18V, fIN = 1kHz, RL = 2kΩ
300579p7
THD+N vs Output Voltage
+VCC = –VEE = 18V, fIN = 1kHz, RL = 600Ω
300579p8
THD+N vs Frequency
+VCC = –VEE = 15V, VO = 3VRMS, RL = 2kΩ
300579p1
THD+N vs Frequency
+VCC = –VEE = 15V, VO = 3VRMS, RL = 600Ω
300579p2
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LME49722
THD+N vs Frequency
+VCC = –VEE = 18V, VO = 3VRMS, RL = 2kΩ
300579p3
THD+N vs Frequency
+VCC = –VEE = 18V, VO = 3VRMS, RL = 600Ω
300579p4
IMD vs Frequency
+VCC = –VEE = 15V, RL = 2kΩ
30057922
IMD vs Frequency
+VCC = –VEE = 15V, RL = 600Ω
30057923
IMD vs Frequency
+VCC = –VEE = 18V, RL = 2kΩ
30057924
IMD vs Frequency
+VCC = –VEE = 18V, RL = 600Ω
30057925
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LME49722
IMD vs Frequency
+VCC = –VEE = 2.5V, RL = 2kΩ
30057920
IMD vs Frequency
+VCC = –VEE = 2.5V, RL = 600Ω
30057921
Voltage Noise Density vs Frequency
+VCC = –VEE = 15V
300579p9
Voltage Noise Density vs Frequency
+VCC = –VEE = 18V
300579q0
Current Noise Density vs Frequency
+VCC = –VEE = 15V
30057917
Current Noise Density vs Frequency
+VCC = –VEE = 18V
30057918
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LME49722
PSRR+ vs Frequency
+VCC = –VEE = 15V, VRIPPLE = 200mVPP, RL = 2kΩ
30057915
PSRR- vs Frequency
+VCC = –VEE = 15V, VRIPPLE = 200mVPP, RL = 2kΩ
30057926
Crosstalk vs Frequency
+VCC = –VEE = 15V, RL = 2kΩ, VOUT = 3VRMS
300579p0
CMRR vs Frequency
+VCC = –VEE = 15V, RL = 2kΩ
30057916
Output Voltage vs Supply Voltage
THD+N = 1%, RL = 2kΩ
300579q1
Output Voltage vs Supply Voltage
THD+N = 1%, RL = 600Ω
300579q2
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LME49722
Supply Current vs Supply Voltage
RL = 2kΩ
30057911
Full Power Bandwidth vs Frequency
+VCC = –VEE = 15V, RL = 2kΩ
30057919
Gain Phase vs Frequency
+VCC = –VEE = 15V
30057914
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LME49722
Application Information
APPLICATION HINTS
The LME49722 is a high speed operational amplifier which
can operate stably in most of the applications. For the appli-
cation with gain greater than 2, capacitive loads up to 100pF
will cause little change in the phase characteristics of the am-
plifiers and are therefore allowable. Capacitive loads greater
than 10pF must be isolated from the output, if the gain value
is less than 2. The most straightforward way to do this is to
put a resistor (its value ≥ 20Ω ) in series with the output. The
resistor will also prevent unnecessary power dissipation if the
output is accidentally shorted.
30057913
FIGURE 2. Low Impedance Microphone Pre-amplifier
30057912
FIGURE 3. Three-Band Active Tone Control
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LME49722
Revision History
Rev Date Description
1.0 03/27/08 Initial release.
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LME49722
Physical Dimensions inches (millimeters) unless otherwise noted
Narrow SOIC Package
Order Number LME49722MA
NS Package Number M08A
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LME49722
Notes
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LME49722
Notes
LME49722 Low Noise, High Performance, High Fidelity Dual Audio Operational Amplifier
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