LME49726
LME49726 High Current, Low Distortion, Rail-to-Rail Output Audio
Operational Amplifier
Literature Number: SNAS432B
LME49726
July 19, 2011
High Current, Low Distortion, Rail-to-Rail Output
Audio Operational Amplifier
General Description
The LME49726 is a low distortion, low noise rail-to-rail output
audio operational amplifier optimized and fully specified for
high performance, high fidelity applications. The LME49726
delivers superior audio signal amplification for outstanding
audio performance. The LME49726 has a very low THD+N to
easily satisfy demanding audio applications. To ensure that
the most challenging loads are driven without compromise,
the LME49726 provides output current greater than 300mA
at 5V. Further, dynamic range is maximized by an output
stage that drives 2kΩ loads to within 4mV of either power
supply voltage.
The LME49726 has a supply range of 2.5V to 5.5V. Over this
supply range the LME49726’s input circuitry maintains excel-
lent common-mode and power supply rejection, as well as
maintaining its low input bias current. The LME49726 is unity
gain stable.
Key Specifications
■ Power Supply Voltage Range 2.5V to 5.5V
■ Quiescent Current per Amplifier
at 5V 0.7mA (typ)
■ THD+N, AV = 1,
fIN = 1kHz, RL = 10kΩ
(VOUT = 3.5VP-P, VDD = 5.0V) 0.00008% (typ)
(VOUT = 1.5VP-P, VDD = 2.5V) 0.00002% (typ)
■ Equivalent Input Noise
(f = 10k) 8.3nV/√Hz (typ)
■ Slew Rate ±3.7V/μs (typ)
■ Gain Bandwidth Product 6.25MHz (typ)
■ Open Loop Gain (RL = 10kΩ) 120dB (typ)
■ Input Bias Current 0.2pA (typ)
■ Input Offset Voltage 0.5mV (typ)
■ PSRR (DC) 104dB (typ)
Features
■Rail-to-rail output
■Easily drives 2kΩ loads to within 4mV of each power
supply voltage rail
■Optimized for superior audio signal fidelity
■Output short circuit protection
■High output drive (>300mA)
■Available in mini-SOIC exposed-DAP package
Applications
■Portable audio amplification
■Preamplifiers and multimedia
■Equalization and crossover networks
■Line drivers and receivers
■Active filters
■DAC I–V converter gain stage
■ADC front-end signal conditioning
Input Voltage Noise vs Frequency
VDD = 3V
30038602
Supply Current vs Supply Voltage
per Amplifier, RL = No Load, AV = –1
30038628
© 2011 National Semiconductor Corporation 300386 www.national.com
LME49726 High Current, Low Distortion, Rail-to-Rail Output Audio Operational Amplifier
Typical Connections
300386p6
FIGURE 1. Inverting Configuration Split Supplies
30038609
FIGURE 2. Inverting Configuration Single Supplies
Connection Diagrams
30038610
Order Number LME49726MY
See NS Package Number MUY08A
Package Marking
300386x7
Top View
Z — Assembly Plant code
X = 1 Digit Date code
TT — Die Traceability
ZA3 — LME49726
Ordering Information
Ordering Information
Order Number Package Package Drawing
Number Transport Media MSL
Level Green Status
LME49726MY MSOP EXPOSE PAD MUY08A 1000 units on tape on reel 1 RoHS & no Sb/Br
LME49726MYX MSOP EXPOSE PAD MUY08A 3500 units on tape on reel 1 RoHS & no Sb/Br
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LME49726
Absolute Maximum Ratings (Note 1, Note
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Supply Voltage
VS = VSS-VDD 6V
Storage Temperature −65°C to 150°C
Input Voltage (VSS) – 0.7V to (VDD) + 0.7V
Output Short Circuit (Note 3) Continuous
Power Dissipation Internally Limited
ESD Rating (Note 4) 2000V
ESD Rating (Note 5) 200V
Junction Temperature 150°C
Thermal Resistance
θJA (MUY-08) 72°C/W
Operating Ratings (Note 1)
Temperature Range
TMIN ≤ TA ≤ TMAX −40°C ≤ TA ≤ 125°C
Supply Voltage Range 2.5V ≤ VS ≤ 5.5V
Electrical Characteristics (VDD = 5.0V and VDD = 2.5V) The following specifications apply for
the circuit shown in Figure 1. VDD = 5.0V and VDD = 2.5V, VSS = 0.0V, VCM = VDD/2, RL = 10kΩ, CLOAD = 20pF, fIN = 1kHz, BW =
20–20kHz, and TA = 25°C, unless otherwise specified.
Symbol Parameter Conditions
LME49726 Units
(Limits)
Typical Limit
(Note 6) (Note 7)
THD+N Total Harmonic Distortion + Noise
AV = –1, VOUT = 3.5Vp-p, VDD = 5V
RL = 600Ω
RL = 2kΩ
RL = 10kΩ
0.0008
0.0002
0.00008
%
%
%
AV = –1, VOUT = 1.5Vp-p, VDD = 2.5V
RL = 600Ω
RL = 2kΩ
RL = 10kΩ
0.001
0.0008
0.0002
%
%
%
GBWP Gain Bandwidth Product 6.25 5.0 MHz (min)
SR Slew Rate AV = +1, RL = 10kΩ3.7 2.5 V/μs (min)
tsSettling time
AV = 1V step
0.1% error range
0.001% error range
800
1.2
ns
μs
eNEquivalent Input Noise Voltage fBW = 20Hz to 20kHz (A-weighted) 0.7 1.25 μVRMS
(max)
eNEquivalent Input Noise Density
f = 10kHz 8.3 nV/√Hz
f = 1kHz 10 nV/√Hz
f = 100Hz 24 nV/√Hz
INCurrent Noise Density f = 1kHz 0.75 pA/√Hz
VOS Input Offset Voltage VIN = VDD/2, VO = VDD/2, AV = 1 0.5 2.25 mV (max)
ΔVOS/ΔTemp Average Input Offset Voltage Drift vs
Temperature 40°C ≤ TA ≤ 85°C 1.2 μV/°C
PSRR Power Supply Rejection Ratio 2.5 to 5.5V, VCM = 0, VDD/2 104 85 dB (min)
ISOCH-CH Channel-to-Channel Isolation fIN = 1kHz 94 dB
IBInput Bias Current VCM = VDD/2 ±0.2 pA
ΔIOS/ΔTemp Input Bias Current Drift vs
Temperature –40°C ≤ TA ≤ 85°C 35 nA/°C
IOS Input Offset Current VCM = VDD/2 ±0.2 pA
VIN-CM Common-Mode Input Voltage Range VDD–1.6
VSS+0.1 V (min)
CMRR Common Mode Rejection Ratio 0.1V < VDD – 1.6V 95 80 dB (min)
1/f 1/f Corner Frequency 2 kHz
AVOL Open-Loop Voltage Gain VOUT = VDD/2 120 100 dB (min)
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LME49726
Symbol Parameter Conditions
LME49726 Units
(Limits)
Typical Limit
(Note 6) (Note 7)
VOUTSWING Maximum Output Voltage Swing
RL = 2kΩ to VDD/2 VDD–0.004
VSS +0.004 V (min)
V (max)
RL = 16Ω to VDD/2 VDD –0.33
VSS+0.33 V (min)
V (max)
IOUT Output Current VOUT = 5V, VDD = 5V 350 mA
VOUT = 2.5V, VDD = 2.5V 160 mA
ISQuiescent Current per Amplifier IOUT = 0mA, VDD = 5V 0.7 1.1 mA (max)
IOUT = 0mA, VDD = 2.5V 0.64 1.0 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 in Absolute Maximum Ratings, whichever is lower. For the LME49726, see Power
Derating curve for additional information.
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 = +25ºC, 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.
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LME49726
Typical Performance Characteristics
THD+N vs Output Voltage
VDD = 1.25V, VSS = –1.25V, RL = 600Ω
AV = –1, f = 1kHz, BW = 22–22kHz
30038618
THD+N vs Frequency
VDD = 1.25V, VSS = –1.25V, RL = 600Ω
VO = 1.5VP-P, BW = 22–80kHz
30038612
THD+N vs Output Voltage
VDD = 1.25V, VSS = –1.25V, RL = 10kΩ
AV = –1, f = 1kHz, BW = 22–22kHz
30038615
THD+N vs Frequency
VDD = 1.25V, VSS = –1.25V, RL = 10kΩ
VO = 1VP-P, BW = 22–80kHz
30038634
THD+N vs Output Voltage
VDD = 2.50V, VSS = –2.50V, RL = 600Ω
AV = –1, f = 1kHz, BW = 22–22kHz
30038619
THD+N vs Frequency
VDD = 2.50V, VSS = –2.50V, RL = 600Ω
VO = 3.5VP-P, BW = 22–80kHz
30038613
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LME49726
THD+N vs Output Voltage
VDD = 2.50V, VSS = –2.50V, RL = 10kΩ
AV = –1, f = 1kHz, BW = 22–22kHz
30038616
THD+N vs Frequency
VDD = 2.50V, VSS = –2.50V, RL = 10kΩ
VO = 1VP-P, BW = 22–80kHz
30038635
THD+N vs Output Voltage
VDD = 2.75V, VSS = –2.75V, RL = 600Ω
AV = –1, f = 1kHz, BW = 22–22kHz
30038620
THD+N vs Frequency
VDD = 2.75V, VSS = –2.75V, RL = 600Ω
VO = 3.5VP-P, BW = 22–80kHz
30038636
THD+N vs Output Voltage
VDD = 2.75V, VSS = –2.75V, RL = 10kΩ
AV = –1, f = 1kHz, BW = 22–22kHz
30038617
THD+N vs Frequency
VDD = 2.75V, VSS = –2.75V, RL = 10kΩ
VO = 3.5VP-P, BW = 22–80kHz
30038611
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LME49726
PSRR+ vs Frequency
VDD = 1.25V, VSS = –1.25V, VRIPPLE = 200mVP-P
Input terminated, BW = 22–80kHz
30038621
PSRR– vs Frequency
VDD = 1.25V, VSS = –1.25V, VRIPPLE = 200mVP-P
Input terminated, BW = 22–80kHz
30038624
PSRR+ vs Frequency
VDD = 2.50V, VEE = –2.50V, VRIPPLE = 200mVP-P
Input terminated, BW = 22–80kHz
30038637
PSRR– vs Frequency
VDD = 2.50V, VSS = –2.50V, VRIPPLE = 200mVP-P
Input terminated, BW = 22–80kHz
30038625
PSRR+ vs Frequency
VDD = 2.75V, VSS = –2.75V, VRIPPLE = 200mVP-P
Input terminated, BW = 22–80kHz
30038623
PSRR– vs Frequency
VDD = 2.75V, VSS = –2.75V, VRIPPLE = 200mVP-P
Input terminated, BW = 22–80kHz
30038638
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LME49726
Output Voltage vs Supply Voltage
RL = 600Ω, AV = –1
f = 1kHz, THD+N = 1%, BW = 22–80kHz
30038633
Output Voltage vs Supply Voltage
RL = 10kΩ, AV = –1
f = 1kHz, THD+N = 1%, BW = 22–80kHz
30038632
Crosstalk vs Frequency
VDD = 2.50V, VSS = –2.50V, RL = 10kΩ
AV = –1, f = 1kHz, BW = 80kHz
30038630
CMRR vs Frequency
VDD = 2.5V, VSS = –2.5V, VRIPPLE = 200mVP-P
30038639
Input Voltage Noise vs Frequency
VDD = 5V
30038603
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LME49726
Application Information
DISTORTION MEASUREMENTS
The vanishingly low residual distortion produced by
LME49726 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. howev-
er, is quite simple: an additional resistor. Adding this resistor
extends the resolution of the distortion measurement equip-
ment.
The LME49726's low residual is an input referred internal er-
ror. As shown in Figure 1, adding the 10Ω resistor connected
between athe 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. Although the
amplifier's closed-loop gain is unaltered, the feedback avail-
able to correct distortion errors is reduced 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 measurement equipment capabilities.
This datasheet's THD+N and IMD values were generated us-
ing the above described circuit connected to an Audio Preci-
sion System Two Cascade.
300386x2
FIGURE 1. THD+N and IMD Distortion Test Circuit
OPERATING RATINGS AND BASIC DESIGN GUIDELINES
The LME49726 has a supply voltage range from +2.5V to
+5.5V single supply or ±1.25 to ±2.75V dual supply.
Bypassed capacitors for the supplies should be placed as
close to the amplifier as possible. This will help minimize any
inductance between the power supply and the supply pins. In
addition to a 10μF capacitor, a 0.1μF capacitor is also rec-
ommended in CMOS amplifiers.
The amplifier's inputs lead lengths should also be as short as
possible. If the op amp does not have a bypass capacitor, it
may oscillate.
BASIC AMPLIFIER CONFIGURATIONS
The LME49726 may be operated with either a single supply
or dual supplies. Figure 2 shows the typical connection for a
single supply inverting amplifier. The output voltage for a sin-
gle supply amplifier will be centered around the common-
mode voltage, VCM. Note, the voltage applied to the VCM
insures the output stays above ground. Typically, the VCM
should be equal to VDD/2. This is done by putting a resistor
divider circuit at this node, see Figure 2.
300386n3
FIGURE 2. Single Supply Inverting Op Amp
9 www.national.com
LME49726
Figure 3 shows the typical connection for a dual supply in-
verting amplifier. The output voltage is centered on zero.
300386n2
FIGURE 3. Dual Supply Inverting Configuration
Figure 4 shows the typical connection for the Buffer Amplifier
or also called a Voltage Follower. The Buffer is a unity gain
stable amplifier.
300386n1
FIGURE 4. Unity-Gain Buffer Configuration
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LME49726
Typical Applications
NAB Preamp
300386n4
AV = 34.5
F = 1 kHz
En = 0.38 μV
A Weighted
NAB Preamp Voltage Gain vs Frequency
300386n5
AV = 34.5
F = 1 kHz
En = 0.38 μV
A Weighted
Balanced to Single Ended Converter
300386n6
VO = V1–V2
Adder/Subtracter
300386n7
VO = V1 + V2 − V3 − V4
Sine Wave Oscillator
300386n8
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LME49726
Second Order High Pass Filter
(Butterworth)
300386n9
Illustration is f0 = 1 kHz
Second Order Low Pass Filter
(Butterworth)
300386o0
Illustration is f0 = 1 kHz
State Variable Filter
300386o1
Illustration is f0 = 1 kHz, Q = 10, ABP = 1
AC/DC Converter
300386o2
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LME49726
2 Channel Panning Circuit (Pan Pot)
300386o3
Line Driver
300386o4
Tone Control
300386o5
Illustration is:
fL = 32 Hz, fLB = 320 Hz
fH =11 kHz, fHB = 1.1 kHz
300386o6
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LME49726
RIAA Preamp
300386o8
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
300386o7
Illustration is:
V0 = 101(V2 − V1)
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LME49726
10 Band Graphic Equalizer
300386p0
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 8: At volume of change = ±12 dB
Q = 1.7
Reference: “AUDIO/RADIO HANDBOOK”, National Semiconductor, 1980, Page 2–61
15 www.national.com
LME49726
LME49726 Bill of Materials
Description Designator Part Number Manufacturer Quantity/Brd
Ceramic Capacitor 0.1uF, 10%,
50V 0805 SMD C1, C2, C5–C8 08055C104KAT2A AVX 2
Tantalum Capacitor 2.2uF,10%,
20V, A-size C9, C11 T491A225K020AT Kemet Not Stuff
Tantalum Capacitor 10uF,10%,
20V, B-size C3, C4 T491B106K020AT Kemet 2
Resistor 0Ω, 1/8W 1% 0805 SMD R1, R4, R6, R9, R13,
R14 CRCW08050000Z0EA Vishay 6
Header, 2-Pin JP1, JP2, JP3, JP4 HDR1X2 Header 2 4
Header, 3-Pin JP5 HDR1X3 Header 3 1
Resistor 10kΩ, 1/8W 1% 0805 SMD R2, R3, R7, R8 CRCW080510K0FKEA Vishay 4
Dual Rail-to-Rail Op Amp U1 LME49726 National
Semiconductor 1
Resistor 100meg/open
1/8W 0805 SMD R5, R10, R11, R12 OPEN N/A N/A 0
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LME49726
LME49726 Board Circuit
30038640
17 www.national.com
LME49726
LME49726 Demo Board Views
30038641
Top Silkscreen
300386x9
Top Layer
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LME49726
300386x8
Bottom Layer
19 www.national.com
LME49726
Revision History
Rev Date Description
1.0 11/05/08 Initial release.
1.01 05/25/10 Increased Operating Temperature Range.
1.02 07/14/11 Added curves 30038602 and 03 and input text edits.
1.03 07/19/11 Re-released the D/S to the WEB after adding curves 30038602 and
03 .
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LME49726
Physical Dimensions inches (millimeters) unless otherwise noted
Mini-SOIC Exposed-DAP Package
Order Number LME49726MY
NS Package Number MUY08A
21 www.national.com
LME49726
Notes
LME49726 High Current, Low Distortion, Rail-to-Rail Output Audio Operational Amplifier
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