LME49720
Dual High Performance, High Fidelity Audio Operational
Amplifier
General Description

RL = 2kΩ

0.00003% (typ)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 withstate-of-the-art circuit design, the LME49720 audio operational amplifiers deliver superior audio signal amplification foroutstanding audio performance. The LME49720 combines
extremely low voltage noise density (2.7nV/√Hz) with vanishingly low THD+N (0.00003%) to easily satisfy the mostdemanding audio applications. To ensure that the most challenging loads are driven without compromise, the LME49720
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 LME49720's outstanding CMRR (120dB), PSRR
(120dB), and VOS (0.1mV) give the amplifier excellent operational amplifier DC performance.
The LME49720 has a wide supply range of ±2.5V to ±17V.
Over this supply range the LME49720’s input circuitry maintains 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 withvalues 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. Demonstration boards are available for each package.

RL = 600Ω

0.00003% (typ)Key Specifications■ Power Supply Voltage Range±2.5V to ±17V■

■ 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

THD+N (AV = 1, VOUT = 3VRMS, fIN = 1kHz)

Typical Application

300038k5

Passively Equalized RIAA Phono Preamplifier© 2007 National Semiconductor Corporation

300038www.national.com

LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier

October 2007

LME49720

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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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)
ESD Susceptibility (Note 5)

200V
100V
150°C

θJA (SO)

145°C/WθJA (NA)

102°C/WθJA (HA)

150°C/WθJC (HA)
Temperature Range(V-) - 0.7V to (V+) + 0.7V
ContinuousInternally Limited
2000V

35°C/W

TMIN ≤ TA ≤ TMAX
Supply Voltage Range–40°C ≤ TA ≤ 85°C

±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.
LME49720
SymbolParameter

Conditions

TypicalLimit(Note 6)(Note 7)

Units
(Limits)

AV = 1, VOUT = 3Vrms
THD+N

Total Harmonic Distortion + Noise

RL = 2kΩ

0.000030.00003

RL = 600Ω
IMD

Intermodulation Distortion

GBWP

Gain Bandwidth ProductSR

Slew Rate

AV = 1, VOUT = 3VRMS
Two-tone, 60Hz & 7kHz 4:1

0.00009

0.00005%

55

45

MHz (min)

±20

±15

V/μs (min)FPBWFull 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

10

MHz

μs
0.65

μVRMS
(max)

en
Equivalent Input Noise Density

f = 1kHzf = 10Hz

2.7
6.4

in

Current Noise Density

f = 1kHzf = 10Hz

1.6
3.1

VOS

Offset Voltage±0.1

Average Input Offset Voltage Drift vsΔVOS/ΔTemp–40°C ≤ TA ≤ 85°C
Temperature

0.2

PSRR

Average Input Offset Voltage Shift vs
ΔVS = 20V (Note 8)
Power Supply Voltage

120

ISOCH-CH

Channel-to-Channel IsolationfIN = 1kHz
fIN = 20kHz

118
112

IB

Input Bias Current

VCM = 0V

10

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% (max)nV/√Hz(max)
pA/√Hz±0.7

mV (max)
μV/°C

110

dB (min)dB

72

nA (max)
nA/°C

11

65

nA (max)

+14.1
–13.9

(V+) – 2.0(V-) + 2.0

V (min)–10V<Vcm<10V

120

110

dB (min)30kΩ–10V<Vcm<10V

1000

MΩ

Differential Input ImpedanceCommon Mode Input Impedance

4.7

3

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LME49720

Pins 1, 4, 7 and 8
Pins 2, 3, 5 and 6
Junction Temperature
Thermal Resistance

Absolute Maximum Ratings (Notes 1, 2)

LME49720

LME49720
SymbolAVOL

VOUTMAX
IOUT

TypicalLimit(Note 6)(Note 7)

–10V<Vout<10V, RL = 600Ω

140

125

–10V<Vout<10V, RL = 2kΩ

140Parameter

Open Loop Voltage Gain

Maximum Output Voltage Swing
Output Current

Conditions–10V<Vout<10V, RL = 10kΩ

140

RL = 600Ω±13.6

RL = 2kΩ±14.0

RL = 10kΩ±14.1

RL = 600Ω, VS = ±17V

±26

dB (min)±12.5
V (min)
±23

+53
–42

IOUT-CC

Instantaneous Short Circuit Current

ROUT

Output Impedance

fIN = 10kHz
Closed-Loop
Open-Loop

0.01
13

CLOAD

Capacitive Load Drive Overshoot

100pF

16

IS

Total Quiescent Current

IOUT = 0mA

10

Units
(Limits)mA (min)
mA

Ω
%
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

THD+N vs Output Voltage
VCC = 12V, VEE = –12V
RL = 2kΩ

300038k6

300038k7

THD+N vs Output Voltage
VCC = 17V, VEE = –17V
RL = 2kΩ

THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ

300038k8300038i4

THD+N vs Output Voltage
VCC = 15V, VEE = –15V
RL = 600Ω

THD+N vs Output Voltage
VCC = 12V, VEE = –12V
RL = 600Ω

300038k9300038l0

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LME49720

THD+N vs Output Voltage
VCC = 17V, VEE = –17V
RL = 600Ω

THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 600Ω

300038l1
300038i6

THD+N vs Output Voltage
VCC = 15V, VEE = –15V
RL = 10kΩ

THD+N vs Output Voltage
VCC = 12V, VEE = –12V
RL = 10kΩ

300038l2

300038l3

THD+N vs Output Voltage
VCC = 17V, VEE = –17V
RL = 10kΩ

THD+N vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ

300038l4
300038i5

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LME49720

THD+N vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
RL = 2kΩ

THD+N vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
RL = 2kΩ

30003862

30003863

THD+N vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
RL = 2kΩ

THD+N vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
RL = 600Ω

30003864

30003859

THD+N vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
RL = 600Ω

THD+N vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
RL = 600Ω

300038k3

30003860

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LME49720

THD+N vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
RL = 10kΩ

THD+N vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
RL = 10kΩ

30003866

30003867

THD+N vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
RL = 10kΩ

IMD vs Output Voltage
VCC = 15V, VEE = –15V
RL = 2kΩ

30003868

300038e6

IMD vs Output Voltage
VCC = 12V, VEE = –12V
RL = 2kΩ

IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ

300038e5

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300038e4

8LME49720

IMD vs Output Voltage
VCC = 17V, VEE = –17V
RL = 2kΩ

IMD vs Output Voltage
VCC = 15V, VEE = –15V
RL = 600Ω

300038e7

300038e2

IMD vs Output Voltage
VCC = 12V, VEE = –12V
RL = 600Ω

IMD vs Output Voltage
VCC = 17V, VEE = –17V
RL = 600Ω

300038e0

300038e3

IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 600Ω

IMD vs Output Voltage
VCC = 15V, VEE = –15V
RL = 10kΩ

300038e1

300038f1

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LME49720

IMD vs Output Voltage
VCC = 12V, VEE = –12V
RL = 10kΩ

IMD vs Output Voltage
VCC = 17V, VEE = –17V
RL = 10kΩ

300038f0

300038f2

IMD vs Output Voltage
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ

Voltage Noise Density vs Frequency

300038h6

300038l6

Current Noise Density vs Frequency

Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
AV = 0dB, RL = 2kΩ

300038h7300038c8

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LME49720

Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 10VRMS
AV = 0dB, RL = 2kΩ

Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
AV = 0dB, RL = 2kΩ

300038c9300038c6

Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 10VRMS
AV = 0dB, RL = 2kΩ

Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
AV = 0dB, RL = 2kΩ

300038c7

300038d0

Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 10VRMS
AV = 0dB, RL = 2kΩ

Crosstalk vs Frequency
VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS
AV = 0dB, RL = 2kΩ

300038d1

300038n8

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LME49720

Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
AV = 0dB, RL = 600Ω

Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 10VRMS
AV = 0dB, RL = 600Ω

300038d6

300038d7

Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
AV = 0dB, RL = 600Ω

Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 10VRMS
AV = 0dB, RL = 600Ω

300038d4

300038d5

Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
AV = 0dB, RL = 600Ω

Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 10VRMS
AV = 0dB, RL = 600Ω

300038d8

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300038d9

12LME49720

Crosstalk vs Frequency
VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS
AV = 0dB, RL = 600Ω

Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 3VRMS
AV = 0dB, RL = 10kΩ

300038d2

300038o0

Crosstalk vs Frequency
VCC = 15V, VEE = –15V, VOUT = 10VRMS
AV = 0dB, RL = 10kΩ

Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 3VRMS
AV = 0dB, RL = 10kΩ

300038n7300038n9

Crosstalk vs Frequency
VCC = 12V, VEE = –12V, VOUT = 10VRMS
AV = 0dB, RL = 10kΩ

Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 3VRMS
AV = 0dB, RL = 10kΩ

300038n6

300038n5

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LME49720

Crosstalk vs Frequency
VCC = 17V, VEE = –17V, VOUT = 10VRMS
AV = 0dB, RL = 10kΩ

Crosstalk vs Frequency
VCC = 2.5V, VEE = –2.5V, VOUT = 1VRMS
AV = 0dB, RL = 10kΩ

300038n3

300038n4

PSRR+ vs Frequency
VCC = 15V, VEE = –15V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR- vs Frequency
VCC = 15V, VEE = –15V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038p2

300038p5

PSRR+ vs Frequency
VCC = 15V, VEE = –15V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR- vs Frequency
VCC = 15V, VEE = –15V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038p3

300038p6

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PSRR- vs Frequency
VCC = 15V, VEE = –15V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

300038p1

300038p4

PSRR+ vs Frequency
VCC = 12V, VEE = –12V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 12V, VEE = –12V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038p8300038q1

PSRR+ vs Frequency
VCC = 12V, VEE = –12V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 12V, VEE = –12V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038p9300038q2

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LME49720

PSRR+ vs Frequency
VCC = 15V, VEE = –15V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

LME49720

PSRR+ vs Frequency
VCC = 12V, VEE = –12V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 12V, VEE = –12V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

300038p7

300038q0

PSRR+ vs Frequency
VCC = 17V, VEE = –17V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 17V, VEE = –17V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038r0

300038r3

PSRR+ vs Frequency
VCC = 17V, VEE = –17V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 17V, VEE = –17V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038r1

300038r4

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PSRR– vs Frequency
VCC = 17V, VEE = –17V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

300038q9300038r2

PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038q4

300038q7

PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ, f = 200kHz, VRIPPLE = 200mVpp

300038q5

300038q817

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LME49720

PSRR+ vs Frequency
VCC = 17V, VEE = –17V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

LME49720

PSRR+ vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

PSRR– vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 600Ω, f = 200kHz, VRIPPLE = 200mVpp

300038q3

300038q6

CMRR vs Frequency
VCC = 15V, VEE = –15V
RL = 2kΩ

CMRR vs Frequency
VCC = 12V, VEE = –12V
RL = 2kΩ

300038f7300038g0

CMRR vs Frequency
VCC = 17V, VEE = –17V
RL = 2kΩ

CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 2kΩ

300038g3

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300038f4

18

LME49720

CMRR vs Frequency
VCC = 15V, VEE = –15V
RL = 600Ω

CMRR vs Frequency
VCC = 12V, VEE = –12V
RL = 600Ω

300038o9

300038f9

CMRR vs Frequency
VCC = 17V, VEE = –17V
RL = 600Ω

CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 600Ω

300038g5

300038f6

CMRR vs Frequency
VCC = 15V, VEE = –15V
RL = 10kΩ

CMRR vs Frequency
VCC = 12V, VEE = –12V
RL = 10kΩ

300038o8

300038f8

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LME49720

CMRR vs Frequency
VCC = 17V, VEE = –17V
RL = 10kΩ

CMRR vs Frequency
VCC = 2.5V, VEE = –2.5V
RL = 10kΩ

300038g4

300038f5

Output Voltage vs Load ResistanceVDD = 15V, VEE = –15V
THD+N = 1%

Output Voltage vs Load ResistanceVDD = 12V, VEE = –12V
THD+N = 1%

300038h0

300038h1

Output Voltage vs Load ResistanceVDD = 17V, VEE = –17V
THD+N = 1%

Output Voltage vs Load ResistanceVDD = 2.5V, VEE = –2.5V
THD+N = 1%

300038h2

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300038g920

LME49720

Output Voltage vs Supply Voltage
RL = 2kΩ, THD+N = 1%

Output Voltage vs Supply Voltage
RL = 600Ω, THD+N = 1%

300038j8300038j9

Output Voltage vs Supply Voltage
RL = 10kΩ, THD+N = 1%

Supply Current vs Supply Voltage
RL = 2kΩ

300038k0

300038j6

Supply Current vs Supply Voltage
RL = 600Ω

Supply Current vs Supply Voltage
RL = 10kΩ

300038j7300038j5

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LME49720

Full Power Bandwidth vs Frequency

Gain Phase vs Frequency

300038j0300038j1

Small-Signal Transient Response
AV = 1, CL = 10pF

Small-Signal Transient Response
AV = 1, CL = 100pF

300038i7

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300038i822

DISTORTION MEASUREMENTS
The vanishingly low residual distortion produced by
LME49720 is below the capabilities of all commercially available equipment. This makes distortion measurements justslightly 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 thisresistor extends the resolution of the distortion measurement
equipment.
The LME49720’s low residual distortion is an input referredinternal error. As shown in Figure 1, adding the 10Ω resistor
connected between the amplifier’s inverting and non-inverting

300038k4

FIGURE 1. THD+N and IMD Distortion Test Circuit

23

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LME49720

inputs changes the amplifier’s noise gain. The result is thatthe 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 measurementswith 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

LME49720

The LME49720 is a high speed op amp with excellent phasemargin and stability. Capacitive loads up to 100pF will cause
little change in the phase characteristics of the amplifiers andare therefore allowable.
Capacitive loads greater than 100pF must be isolated fromthe 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 accidentallyshorted.

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

Flat Amp Voltage Gain vsFrequency

30003828

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3000382924

LME49720

TYPICAL APPLICATIONSNAB Preamp

NAB Preamp Voltage Gain
vs Frequency

30003831

30003830

AV = 34.5
F = 1 kHz
En = 0.38 μV
A Weighted

Balanced to Single Ended Converter

Adder/Subtracter

30003833

VO = V1 + V2 − V3 − V4
30003832

VO = V1–V2Sine Wave Oscillator

30003834

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LME49720

Second Order High Pass Filter(Butterworth)

Second Order Low Pass Filter(Butterworth)

30003835

30003836

Illustration is f0 = 1 kHz
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)

Line Driver

30003839

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 kHzA Weighted
A Weighted, VIN = 10 mV@f = 1 kHz

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28

LME49720

Balanced Input Mic Amp

30003843

Illustration is:V0 = 101(V2 − V1)29

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LME49720

10 Band Graphic Equalizer

30003844

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
8200pF0.82μF

68kΩ

470Ω

500

0.39μF

62kΩ

470Ω

1k

3900pF0.22μF

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

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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

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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

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32

LME49720

TO-99 Metal Can Package
Order Number LME49720HANS Package Number H08C

33

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LME49720 Dual High Performance, High Fidelity Audio Operational Amplifier

Notes

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