LME49720
LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier
Literature Number: SNAS393B
October 2007
LME49720
Dual High Performance, High Fidelity Audio Operational
Amplifier
General Description
The LME49720 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 LME49720 audio opera-
tional amplifiers deliver superior audio signal amplification for
outstanding audio performance. The LME49720 combines
extremely low voltage noise density (2.7nV/√Hz) with van-
ishingly low THD+N (0.00003%) to easily satisfy the most
demanding audio applications. To ensure that the most chal-
lenging loads are driven without compromise, the LME49720
has a high slew rate of ±20V/μs and an output current capa-
bility 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 LME49720's outstanding CMRR (120dB), PSRR
(120dB), and VOS (0.1mV) give the amplifier excellent oper-
ational amplifier DC performance.
The LME49720 has a wide supply range of ±2.5V to ±17V.
Over this supply range the LME49720’s input circuitry main-
tains excellent common-mode and power supply rejection, as
well as maintaining its low input bias current. The LME49720
is unity gain stable. This Audio Operational Amplifier achieves
outstanding AC performance while driving complex loads with
values as high as 100pF.
The LME49720 is available in 8–lead narrow body SOIC, 8–
lead Plastic DIP, and 8–lead Metal Can TO-99. Demonstra-
tion 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 2.7nV/√Hz (typ)
■ Slew Rate ±20V/μs (typ)
■ Gain Bandwidth Product 55MHz (typ)
■ Open Loop Gain (RL = 600Ω) 140dB (typ)
■ Input Bias Current 10nA (typ)
■ Input Offset Voltage 0.1mV (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
Typical Application
300038k5
Passively Equalized RIAA Phono Preamplifier
© 2007 National Semiconductor Corporation 300038 www.national.com
LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier
Connection Diagrams
30003855
Order Number LME49720MA
See NS Package Number — M08A
Order Number LME49720NA
See NS Package Number — N08E
Metal Can
300038f3
Order Number LME49720HA
See NS Package Number — H08C
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LME49720
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)
Pins 1, 4, 7 and 8 200V
Pins 2, 3, 5 and 6 100V
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 for the LME49720 (Notes 1, 2) The following specifications apply for
VS = ±15V, RL = 2kΩ, fIN = 1kHz, and TA = 25°C, unless otherwise specified.
Symbol Parameter Conditions
LME49720 Units
(Limits)
Typical Limit
(Note 6) (Note 7)
THD+N Total Harmonic Distortion + Noise
AV = 1, VOUT = 3Vrms
RL = 2kΩ
RL = 600Ω
0.00003
0.00003 0.00009
% (max)
IMD Intermodulation Distortion AV = 1, VOUT = 3VRMS
Two-tone, 60Hz & 7kHz 4:1 0.00005 %
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
(max)
Equivalent Input Noise Density f = 1kHz
f = 10Hz
2.7
6.4
4.7 nV/√Hz
(max)
inCurrent Noise Density f = 1kHz
f = 10Hz
1.6
3.1
pA/√Hz
VOS Offset Voltage ±0.1 ±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 8) 120 110 dB (min)
ISOCH-CH Channel-to-Channel Isolation fIN = 1kHz
fIN = 20kHz
118
112
dB
IBInput Bias Current VCM = 0V 10 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 11 65 nA (max)
VIN-CM Common-Mode Input Voltage Range +14.1
–13.9
(V+) – 2.0
(V-) + 2.0 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
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LME49720
Symbol Parameter Conditions
LME49720 Units
(Limits)
Typical Limit
(Note 6) (Note 7)
AVOL Open Loop Voltage Gain
–10V<Vout<10V, RL = 600Ω 140 125
dB (min)
–10V<Vout<10V, RL = 2kΩ140
–10V<Vout<10V, RL = 10kΩ140
VOUTMAX Maximum Output Voltage Swing
RL = 600Ω ±13.6 ±12.5
V (min)
RL = 2kΩ±14.0
RL = 10kΩ±14.1
IOUT Output Current RL = 600Ω, VS = ±17V ±26 ±23 mA (min)
IOUT-CC Instantaneous Short Circuit Current +53
–42
mA
ROUT Output Impedance
fIN = 10kHz
Closed-Loop
Open-Loop
0.01
13
Ω
CLOAD Capacitive Load Drive Overshoot 100pF 16 %
ISTotal Quiescent Current IOUT = 0mA 10 12 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) |.
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LME49720
Typical Performance Characteristics
THD+N vs Output Voltage
VCC = 15V, VEE = –15V
RL = 2kΩ
300038k6
THD+N vs Output Voltage
VCC = 12V, VEE = –12V
RL = 2kΩ
300038k7
THD+N vs Output Voltage
VCC = 17V, VEE = –17V
RL = 2kΩ
300038k8
THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ
300038i4
THD+N vs Output Voltage
VCC = 15V, VEE = –15V
RL = 600Ω
300038k9
THD+N vs Output Voltage
VCC = 12V, VEE = –12V
RL = 600Ω
300038l0
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LME49720
THD+N vs Output Voltage
VCC = 17V, VEE = –17V
RL = 600Ω
300038l1
THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 600Ω
300038i6
THD+N vs Output Voltage
VCC = 15V, VEE = –15V
RL = 10kΩ
300038l2
THD+N vs Output Voltage
VCC = 12V, VEE = –12V
RL = 10kΩ
300038l3
THD+N vs Output Voltage
VCC = 17V, VEE = –17V
RL = 10kΩ
300038l4
THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ
300038i5
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LME49720
THD+N vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
RL = 2kΩ
30003863
THD+N vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
RL = 2kΩ
30003862
THD+N vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
RL = 2kΩ
30003864
THD+N vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
RL = 600Ω
30003859
THD+N vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
RL = 600Ω
300038k3
THD+N vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
RL = 600Ω
30003860
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LME49720
THD+N vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
RL = 10kΩ
30003867
THD+N vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
RL = 10kΩ
30003866
THD+N vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
RL = 10kΩ
30003868
IMD vs Output Voltage
VCC = 15V, VEE = –15V
RL = 2kΩ
300038e6
IMD vs Output Voltage
VCC = 12V, VEE = –12V
RL = 2kΩ
300038e5
IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ
300038e4
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LME49720
IMD vs Output Voltage
VCC = 17V, VEE = –17V
RL = 2kΩ
300038e7
IMD vs Output Voltage
VCC = 15V, VEE = –15V
RL = 600Ω
300038e2
IMD vs Output Voltage
VCC = 12V, VEE = –12V
RL = 600Ω
300038e0
IMD vs Output Voltage
VCC = 17V, VEE = –17V
RL = 600Ω
300038e3
IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 600Ω
300038e1
IMD vs Output Voltage
VCC = 15V, VEE = –15V
RL = 10kΩ
300038f1
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LME49720
IMD vs Output Voltage
VCC = 12V, VEE = –12V
RL = 10kΩ
300038f0
IMD vs Output Voltage
VCC = 17V, VEE = –17V
RL = 10kΩ
300038f2
IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ
300038l6
Voltage Noise Density vs Frequency
300038h6
Current Noise Density vs Frequency
300038h7
Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
AV = 0dB, RL = 2kΩ
300038c8
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LME49720
Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 10VRMS
AV = 0dB, RL = 2kΩ
300038c9
Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
AV = 0dB, RL = 2kΩ
300038c6
Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 10VRMS
AV = 0dB, RL = 2kΩ
300038c7
Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
AV = 0dB, RL = 2kΩ
300038d0
Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 10VRMS
AV = 0dB, RL = 2kΩ
300038d1
Crosstalk vs Frequency
VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS
AV = 0dB, RL = 2kΩ
300038n8
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LME49720
Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
AV = 0dB, RL = 600Ω
300038d6
Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 10VRMS
AV = 0dB, RL = 600Ω
300038d7
Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
AV = 0dB, RL = 600Ω
300038d4
Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 10VRMS
AV = 0dB, RL = 600Ω
300038d5
Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
AV = 0dB, RL = 600Ω
300038d8
Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 10VRMS
AV = 0dB, RL = 600Ω
300038d9
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LME49720
Crosstalk vs Frequency
VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS
AV = 0dB, RL = 600Ω
300038d2
Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
AV = 0dB, RL = 10kΩ
300038o0
Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 10VRMS
AV = 0dB, RL = 10kΩ
300038n7
Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
AV = 0dB, RL = 10kΩ
300038n9
Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 10VRMS
AV = 0dB, RL = 10kΩ
300038n6
Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
AV = 0dB, RL = 10kΩ
300038n5
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LME49720
Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 10VRMS
AV = 0dB, RL = 10kΩ
300038n3
Crosstalk vs Frequency
VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS
AV = 0dB, RL = 10kΩ
300038n4
PSRR+ vs Frequency
VCC = 15V, VEE = –15V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038p2
PSRR- vs Frequency
VCC = 15V, VEE = –15V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038p5
PSRR+ vs Frequency
VCC = 15V, VEE = –15V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038p3
PSRR- vs Frequency
VCC = 15V, VEE = –15V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038p6
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LME49720
PSRR+ vs Frequency
VCC = 15V, VEE = –15V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038p1
PSRR- vs Frequency
VCC = 15V, VEE = –15V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038p4
PSRR+ vs Frequency
VCC = 12V, VEE = –12V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038p8
PSRR– vs Frequency
VCC = 12V, VEE = –12V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038q1
PSRR+ vs Frequency
VCC = 12V, VEE = –12V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038p9
PSRR– vs Frequency
VCC = 12V, VEE = –12V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038q2
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LME49720
PSRR+ vs Frequency
VCC = 12V, VEE = –12V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038p7
PSRR– vs Frequency
VCC = 12V, VEE = –12V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038q0
PSRR+ vs Frequency
VCC = 17V, VEE = –17V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038r0
PSRR– vs Frequency
VCC = 17V, VEE = –17V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038r3
PSRR+ vs Frequency
VCC = 17V, VEE = –17V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038r1
PSRR– vs Frequency
VCC = 17V, VEE = –17V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038r4
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LME49720
PSRR+ vs Frequency
VCC = 17V, VEE = –17V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038q9
PSRR– vs Frequency
VCC = 17V, VEE = –17V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038r2
PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038q4
PSRR– vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038q7
PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038q5
PSRR– vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp
300038q8
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LME49720
PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038q3
PSRR– vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp
300038q6
CMRR vs Frequency
VCC = 15V, VEE = –15V
RL = 2kΩ
300038g0
CMRR vs Frequency
VCC = 12V, VEE = –12V
RL = 2kΩ
300038f7
CMRR vs Frequency
VCC = 17V, VEE = –17V
RL = 2kΩ
300038g3
CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ
300038f4
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LME49720
CMRR vs Frequency
VCC = 15V, VEE = –15V
RL = 600Ω
300038o9
CMRR vs Frequency
VCC = 12V, VEE = –12V
RL = 600Ω
300038f9
CMRR vs Frequency
VCC = 17V, VEE = –17V
RL = 600Ω
300038g5
CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 600Ω
300038f6
CMRR vs Frequency
VCC = 15V, VEE = –15V
RL = 10kΩ
300038o8
CMRR vs Frequency
VCC = 12V, VEE = –12V
RL = 10kΩ
300038f8
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LME49720
CMRR vs Frequency
VCC = 17V, VEE = –17V
RL = 10kΩ
300038g4
CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ
300038f5
Output Voltage vs Load Resistance
VDD = 15V, VEE = –15V
THD+N = 1%
300038h1
Output Voltage vs Load Resistance
VDD = 12V, VEE = –12V
THD+N = 1%
300038h0
Output Voltage vs Load Resistance
VDD = 17V, VEE = –17V
THD+N = 1%
300038h2
Output Voltage vs Load Resistance
VDD = 2.5V, VEE = –2.5V
THD+N = 1%
300038g9
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LME49720
Output Voltage vs Supply Voltage
RL = 2kΩ, THD+N = 1%
300038j9
Output Voltage vs Supply Voltage
RL = 600Ω, THD+N = 1%
300038j8
Output Voltage vs Supply Voltage
RL = 10kΩ, THD+N = 1%
300038k0
Supply Current vs Supply Voltage
RL = 2kΩ
300038j6
Supply Current vs Supply Voltage
RL = 600Ω
300038j5
Supply Current vs Supply Voltage
RL = 10kΩ
300038j7
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LME49720
Full Power Bandwidth vs Frequency
300038j0
Gain Phase vs Frequency
300038j1
Small-Signal Transient Response
AV = 1, CL = 10pF
300038i7
Small-Signal Transient Response
AV = 1, CL = 100pF
300038i8
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LME49720
Application Information
DISTORTION MEASUREMENTS
The vanishingly low residual distortion produced by
LME49720 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 LME49720’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
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 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 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.
300038k4
FIGURE 1. THD+N and IMD Distortion Test Circuit
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LME49720
The LME49720 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 pre-
vent excess power dissipation if the output is accidentally
shorted.
30003827
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
30003828
Flat Amp Voltage Gain vs
Frequency
30003829
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LME49720
TYPICAL APPLICATIONS
NAB Preamp
30003830
AV = 34.5
F = 1 kHz
En = 0.38 μV
A Weighted
NAB Preamp Voltage Gain
vs Frequency
30003831
Balanced to Single Ended Converter
30003832
VO = V1–V2
Adder/Subtracter
30003833
VO = V1 + V2 − V3 − V4
Sine Wave Oscillator
30003834
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LME49720
Second Order High Pass Filter
(Butterworth)
30003835
Illustration is f0 = 1 kHz
Second Order Low Pass Filter
(Butterworth)
30003836
Illustration is f0 = 1 kHz
State Variable Filter
30003837
Illustration is f0 = 1 kHz, Q = 10, ABP = 1
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LME49720
AC/DC Converter
30003838
2 Channel Panning Circuit (Pan Pot)
30003839
Line Driver
30003840
Tone Control
300038p0
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LME49720
Illustration is:
fL = 32 Hz, fLB = 320 Hz
fH =11 kHz, fHB = 1.1 kHz
30003842
RIAA Preamp
30003803
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 28
LME49720
Balanced Input Mic Amp
30003843
Illustration is:
V0 = 101(V2 − V1)
29 www.national.com
LME49720
10 Band Graphic Equalizer
30003844
fo (Hz) C1C2R1R2
32 0.12μF4.7μF 75kΩ 500Ω
64 0.056μF3.3μF 68kΩ 510Ω
125 0.033μF1.5μF 62kΩ 510Ω
250 0.015μF0.82μF 68kΩ 470Ω
500 8200pF 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 30
LME49720
Revision History
Rev Date Description
1.0 03/30/07 Initial release.
1.1 05/03/07 Put the “general note” under the EC table.
1.2 10/22/07 Replaced all the PSRR curves.
31 www.national.com
LME49720
Physical Dimensions inches (millimeters) unless otherwise noted
Narrow SOIC Package
Order Number LME49720MA
NS Package Number M08A
Dual-In-Line Package
Order Number LME49720NA
NS Package Number N08E
www.national.com 32
LME49720
TO-99 Metal Can Package
Order Number LME49720HA
NS Package Number H08C
33 www.national.com
LME49720
Notes
LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier
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