LME49721 High Performance, High Fidelity Rail-to-Rail Input/Output Audio Operational Amplifier
October 2007
LME49721
High Performance, High Fidelity Rail-to-Rail Input/Output
Audio Operational Amplifier
General Description
The LME49721 is a low distortion, low noise Rail-to-Rail Input/
Output operational amplifier optimized and fully specified for
high performance, high fidelity applications. Combining ad-
vanced leading-edge process technology with state-of-the-art
circuit design, the LME49721 Rail-to-Rail Input/Output oper-
ational amplifier delivers superior signal amplification for out-
standing performance. The LME49721 combines a very high
slew rate with low THD+N to easily satisfy demanding appli-
cations. To ensure that the most challenging loads are driven
without compromise, the LME49721 has a high slew rate of
±8.5V/μs and an output current capability of ±9.7mA. Further,
dynamic range is maximized by an output stage that drives
10kΩ loads to within 10mV of either power supply voltage.
The LME49721 has a wide supply range of 2.2V to 5.5V. Over
this supply range the LME49721’s input circuitry maintains
excellent common-mode and power supply rejection, as well
as maintaining its low input bias current. The LME49721 is
unity gain stable.
■
Gain Bandwidth Product
■
Open Loop Gain (R
L
= 600Ω)
■
Input Bias Current
■
Input Offset Voltage
■
PSRR
20MHz (typ)
118dB (typ)
40fA (typ)
0.3mV (typ)
103dB (typ)
Features
■
Rail-to-rail Input and Output
■
Easily drives 10kΩ loads to within 10mV of each power
supply voltage
■
Optimized for superior audio signal fidelity
■
Output short circuit protection
Applications
■
■
■
■
■
■
■
■
■
■
■
Ultra high quality portable 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
DAC I–V converter
ADC front-end signal conditioning
Key Specifications
■
Power Supply Voltage Range
■
Quiescent Current
■
THD+N (A
V
= 2, V
OUT
= 4V
p-p
, f
IN
= 1kHz)
R
L
= 2kΩ
R
L
= 600Ω
0.00008% (typ)
0.0001% (typ)
4nV/
√
Hz (typ), @ 1kHz
±8.5V/μs (typ)
2.2V to 5.5V
2.15mA (typ)
■
Input Noise Density
■
Slew Rate
Typical Connection, Pinout, and Package Marking
20204909
20204910
FIGURE 1. Buffer Amplifier
Order Number LME49721MA
Se NS Package Number M08A
© 2007 National Semiconductor Corporation
202049
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LME49721
Package Marking
202049x1
NS = National Logo
Z = Assembly plant code
X = 1 Digit date code
TT = Lot traceability
L49721 = LME49721
MA = Narrow SOIC package code
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2
LME49721
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
(V
S
= V
+
- V
-
)
Storage Temperature
Input Voltage
Output Short Circuit (Note 3)
6V
−65°C to 150°C
(V-)
-
0.7V to (V+)
+
0.7V
Continuous
Power Dissipation
ESD Rating (Note 4)
ESD Rating (Note 5)
Junction Temperature
Thermal Resistance
θ
JA
(SO)
Temperature Range
T
MIN
≤
T
A
≤
T
MAX
Supply Voltage Range
Internally Limited
2000V
200V
150°C
165°C/W
–40°C
≤
T
A
≤
85°C
2.2V
≤
V
S
≤
5.5V
Electrical Characteristics for the LME49721
Symbol
Parameter
The following specifications apply for the circuit shown
in Figure 1. V
S
= 5V, R
L
= 10kΩ, R
SOURCE
= 10Ω,
f
IN
= 1kHz, and T
A
= 25°C, unless otherwise specified.
LME49721
Conditions
A
V
= +1, V
OUT
= 2V
p-p
,
THD+N
Total Harmonic Distortion + Noise
R
L
= 2kΩ
R
L
= 600Ω
IMD
GBWP
SR
FPBW
Intermodulation Distortion
Gain Bandwidth Product
Slew Rate
Full Power Bandwidth
A
V
= +1
V
OUT
= 1V
P-P
, –3dB
referenced to output magnitude
at f = 1kHz
A
V
= 1, 4V step
0.1% error range
f
BW
= 20Hz to 20kHz,
A-weighted
f = 1kHz
A-weighted
f = 10kHz
A
V
= +1, V
OUT
= 2V
p-p
,
Two-tone, 60Hz & 7kHz 4:1
0.0002
0.0002
0.0004
20
8.5
2.2
15
0.001
% (max)
%
MHz (min)
V/μs (min)
MHz
Typical
(Note 6)
Limit
(Note 7)
Units
(Limits)
t
s
Settling time
Equivalent Input Noise Voltage
800
.707
4
4.0
0.3
1.1
103
85
1.5
1.13
6
ns
μV
P-P
(max)
e
n
Equivalent Input Noise Density
Current Noise Density
Offset Voltage
nV/
√
Hz
(max)
i
n
V
OS
ΔV
OS
/ΔTemp
PSRR
ISO
CH-CH
I
B
ΔI
OS
/ΔTemp
I
OS
V
IN-CM
CMRR
fA/
√
Hz
mV (max)
μV/°C
dB (min)
dB
fA
fA/°C
fA
(V+) – 0.1
(V-) + 0.1
V (min)
dB (min)
Hz
100
dB (min)
dB (min)
115
dB (min)
Average Input Offset Voltage Drift vs
40°C
≤
T
A
≤
85°C
Temperature
Average Input Offset Voltage Shift vs
Power Supply Voltage
Channel-to-Channel Isolation
Input Bias Current
Input Bias Current Drift vs
Temperature
Input Offset Current
Common-Mode Input Voltage Range
Common-Mode Rejection
1/f Corner Frequency
V
SS
- 200mV < V
OUT
< V
DD
+ 200mV
R
L
= 600Ω
R
L
= 2kΩ
R
L
= 10kΩ
V
SS
- 100mV < V
CM
< V
DD
+ 100mV
f
IN
= 1kHz
V
CM
= V
S
/2
–40°C
≤
T
A
≤
85°C
V
CM
= V
S
/2
117
40
48
60
93
2000
118
122
130
70
A
VOL
Open Loop Voltage Gain
3
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LME49721
LME49721
Symbol
Parameter
Conditions
Typical
(Note 6)
R
L
= 600Ω
V
OUTMIN
Output Voltage Swing
R
L
= 10kΩ, V
S
= 5.0V
I
OUT
I
OUT-SC
R
OUT
I
S
Output Current
Short Circuit Current
Output Impedance
Quiescent Current per Amplifier
f
IN
= 10kHz
Closed-Loop
Open-Loop
I
OUT
= 0mA
R
L
= 250Ω,
V
S
= 5.0V
V
DD
– 30mV
V
SS
+ 30mV
V
DD
– 10mV
V
SS
+ 10mV
9.7
100
0.01
46
2.15
3.25
Limit
(Note 7)
V
DD
– 80mV
V
SS
+ 80mV
V
DD
– 20mV
V
SS
+ 20mV
9.3
Units
(Limits)
V (min)
V (min)
V (min)
V (min)
mA (min)
mA
Ω
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 T
JMAX
, θ
JA
, and the ambient temperature, T
A
. The maximum
allowable power dissipation is P
DMAX
= (T
JMAX
- T
A
) / θ
JA
or the number given in
Absolute Maximum Ratings,
whichever is lower.
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 T
A
= +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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4
LME49721
Typical Performance Characteristics
THD+N vs Frequency
V
S
= ±2.5V, V
OUT
= 4V
P-P
R
L
= 2kΩ, A
V
= 2, BW = 22kHz
Graphs were taken in dual supply configuration.
THD+N vs Frequency
V
S
= ±2.5V, V
OUT
= 4V
P-P
R
L
= 2kΩ, A
V
= 2
202049t6
202049t5
THD+N vs Frequency
V
S
= ±2.5V, V
OUT
= 4V
P-P
R
L
= 10kΩ, A
V
= 2, BW = 22kHz
THD+N vs Frequency
V
S
= ±2.5V, V
OUT
= 4V
P-P
R
L
= 10kΩ, A
V
= 2
202049t8
202049t7
THD+N vs Frequency
V
S
= ±2.5V, V
OUT
= 4V
P-P
R
L
= 600Ω,
A
V
= 2, BW = 22kHz
THD+N vs Frequency
V
S
= ±2.5V, V
OUT
= 4V
P-P
R
L
= 600Ω,
A
V
= 2
202049u0
202049t9
5
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