LME49871MA [NSC]
High Performance, High Fidelity Current Feedback Audio Operational Amplifier; 高性能，高保真电流反馈型音频运算放大器
| 型号： | LME49871MA |
| 厂家： | 
National Semiconductor |
| 描述： | High Performance, High Fidelity Current Feedback Audio Operational Amplifier |
| 文件： | 总14页 (文件大小：412K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
April 28, 2008
LME49871
High Performance, High Fidelity Current Feedback Audio
Operational Amplifier
General Description
Key Specifications
The LME49871 is an ultra-low distortion, low noise, ultra high
slew rate current feedback operational amplifier optimized
and fully specified for high performance, high fidelity applica-
tions. Combining advanced leading-edge process technology
with state-of-the-art circuit design, the LME49871 current
feedback operational amplifier delivers superior signal ampli-
fication for outstanding performance. Operating on a wide
supply range of ±5V to ±22V, the LME49871 combines ex-
tremely low voltage noise density (1.9nV/√Hz) with very low
THD+N (0.00012%) to easily satisfy the most demanding ap-
plications. To ensure that the most challenging loads are
driven without compromise, the LME49871 has a high slew
rate of ±1900V/μs and an output current capability of ±100-
mA. Further, dynamic range is maximized by an output stage
that drives 150Ω loads to within 2.9V of either power supply
voltage.
■ꢀPower Supply Voltage Range
■ꢀTHD+N
ꢀ(AV = 1, RL = 100Ω, VOUT = 2VP-P
ꢀf = 1kHz)
■ꢀTHD+N
ꢀ(AV = 1, RL = 600Ω, VOUT = 1.4VRMS
ꢀf = 1kHz)
±5V to ±22V
,
0.00021% (typ)
,
0.00012% (typ)
1.9nV/√Hz (typ)
±1900V/μs (typ)
■ꢀInput Noise Density
■ꢀSlew Rate
■ꢀ Bandwidth
213MHz (typ)
(AV = 1, RL= 2kΩ, RF = 800Ω)
1.8μA (typ)
0.05mV (typ)
102dB (typ)
90dB (typ)
■ꢀInput Bias Current
■ꢀInput Offset Voltage
■ꢀPSRR
The LME49871 's outstanding CMRR (88dB), PSRR (102dB),
and VOS (0.05mV) give the amplifier excellent operational
amplifier DC performance.
The LME49871 is available in an 8–lead narrow body SOIC.
Demonstration boards are available.
■ꢀCMRR
Features
Easily drives 150Ω loads
■
■
■
■
Optimized for superior audio signal fidelity
Output short circuit protection
SOIC package
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
■
© 2008 National Semiconductor Corporation
300426
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Connection Diagrams
SOIC Package
30042601
Order Number LME49871MA
See NS Package Number M08A
LME49871MA Top Mark
30042602
N = National Logo
Z = Assembly plant code
X = 1 Digit date code
TT = Die traceability
L49871 = LME49871
MA = Package code
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2
ESD Rating (Note 4)
ESD Rating (Note 5)
Pins 1, 4, 7 and 8
Pins 2, 3, 5 and 6
Junction Temperature
Thermal Resistance
ꢁθJA (MA)
2000V
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.
200V
100V
150°C
Power Supply Voltage
(VS = V+ - V-)
Storage Temperature
Input Voltage
46V
−65°C to 150°C
145°C/W
Temperature Range
(V-)ꢀ-ꢀ0.7V to (V+)ꢀ+ꢀ0.7V
Continuous
TMIN ≤ TA ≤ TMAX
Supply Voltage Range
–40°C ≤ TA ≤ 85°C
±5.0V ≤ VS ≤ ±22V
Output Short Circuit (Note 3)
Power Dissipation
Internally Limited
Electrical Characteristics (Notes 1, 2) The following specifications apply for ±22V, RL = 2kΩ, RSOURCE
10Ω, fIN = 1kHz, and TA = 25°C, unless otherwise specified.
=
LME49871
Units
(Limits)
Symbol
Parameter
Conditions
Typical
Limit
(Note 6)
(Note 7)
AV = 1, f = 1kHz, RF = 1.2kΩ
RL = 100Ω, VOUT = 3VRMS
RL = 600Ω, VOUT = 1.4VRMS
THD+N
Total Harmonic Distortion + Noise
Intermodulation Distortion
0.00021
0.00012
%
%
AV = 1, VIN = 3VRMS
IMD
0.00009
%
Two-tone, 60Hz & 7kHz 4:1
213
MHz
BW
SR
Bandwidth
Slew Rate
AV = –1, RF = 800Ω
VOUT = 20VP-P, AV = –5
±1900
V/μs
VOUT = 20VP-P, –3dB
FPBW
ts
Full Power Bandwidth
referenced to output magnitude
at f = 1kHz, AV = 1
30
MHz
AV = –1, 10V step,
0.1% error range
Settling Time
50
ns
μVRMS
(max)
fBW = 20Hz to 20kHz
Equivalent Input Noise Voltage
Equivalent Input Noise Density
0.26
0.6
4.0
en
f = 1kHz
f = 10Hz
1.9
11.5
ꢀnV/√Hz
(max)
ꢀpA/√Hz
ꢀpA/√Hz
mV (max)
f = 1kHz
f = 10Hz
16
160
in
Current Noise Density
Input Offset Voltage
VOS
±0.05
±1.0
Average Input Offset Voltage Drift vs
Temperature
ΔVOS/ΔTemp
0.29
–40°C ≤ TA ≤ 85°C
μV/°C
Average Input Offset Voltage Shift vs
Power Supply Voltage
PSRR
IB
VS = ±22V, ΔVS = 30V (Note 8)
102
1.8
100
6
dB (min)
VCM = 0V
Input Bias Current
μA (max)
–40°C ≤ TA ≤ 85°C
Inverting input
Non-inverting input
Input Bias Current Drift vs
Temperature
ΔIOS/ΔTemp
4.5
4.7
nA/°C
nA/°C
IOS
Input Offset Current
VCM = 0V
1.3
5
μA (max)
(V+) – 1.0
(V-) + 1.0
V (min)
V (min)
VIN-CM
CMRR
VS = ±22V
Common-Mode Input Voltage Range
±20.5
Common-Mode Rejection
90
1.2
58
86
dB (min)
MΩ
–10V ≤ VCM ≤ 10V
–10V ≤ VCM ≤ 10V
Non-inverting-input Input Impedance
ZIN
Inverting-input Input Impedance
–10V ≤ VCM ≤ 10V
VOUT = ±10V
RL = 200Ω
Ω
ZT
Transimpedance
MΩ (min)
MΩ (min)
4.2
4.7
2.0
2.65
RL = ∞
3
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LME49871
Units
(Limits)
Symbol
Parameter
Conditions
Typical
Limit
(Note 7)
±17.6
(Note 6)
±18.6
RL = 150Ω
RL = 600Ω
V (min)
V (min)
mA (min)
mA
VOUTMAX
Maximum Output Voltage Swing
±19.4
±100
±140
±18.4
±93
IOUT
Output Current
RL = 150Ω, VS = ±22V
IOUT-CC
Instantaneous Short Circuit Current
fIN = 5MHz
Open-Loop
IOUT = 0mA
ROUT
IS
Output Resistance
10
Ω
Total Quiescent Current
8.3
9.5
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. TheRecommended 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: Amplifier output connected to GND, any number of amplifiers within a package.
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.
Note 8: PSRR is measured as follows: VOS is measured at two supply voltages, ±7V and ±22V. PSRR = | 20log(ΔVOS/ΔVS) |.
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4
Typical Performance Characteristics
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 3VRMS, RL = 1kΩ, VS = ±15V, AV = 1
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 3VRMS, RL = 100Ω, VS = ±15V, AV = 1
30042619
30042620
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 3VRMS, RL = 600Ω, VS = ±15V, AV = 1
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 1.4VRMS, RL = 1kΩ, VS = ±15V, AV = 1
30042621
30042616
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 1.4VRMS, RL = 100Ω, VS = ±15V, AV = 1
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 1.4VRMS, RL = 600Ω, VS = ±15V, AV = 1
30042617
30042618
5
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FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 3VRMS, RL = 1kΩ, VS = ±22V, AV = 1
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 3VRMS, RL = 100Ω, VS = ±22V, AV = 1
30042681
30042682
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 3VRMS, RL = 600Ω, VS = ±22V, AV = 1
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 1.4VRMS, RL = 1kΩ, VS = ±22V, AV = 1
30042680
30042677
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 1.4VRMS, RL = 100Ω, VS = ±22V, AV = 1
FFT of 1kHz Sinewave, 0dBr Input Magnitude
VOUT = 1.4VRMS, RL = 600Ω, VS = ±22V, AV = 1
30042678
30042679
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Output Voltage vs Supply Voltage
AV = 1, RL = 600Ω, 1% THD+N
Output Voltage vs Supply Voltage
AV = 1, RL = open, 1% THD+N
30042687
30042688
Supply Current (ICC) vs Power Supply
RL = open
Gain vs Frequency
VS = ±15V, G = –1
30042604
30042689
Gain vs Frequency
VS = ±15V, G = –2
Gain vs Frequency
VS = ±15V, G = –5
30042605
30042606
7
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Gain vs Frequency
VS = ±15V, G = –10
Gain vs Frequency
VS = ±15V, RF = 800Ω
30042607
30042608
Gain vs Frequency
VS = ±15V, RF = 1.2kΩ
Gain vs Frequency
VS = ±15V, RF = 2kΩ
30042610
30042609
Gain vs Frequency
VS = ±15V, RF = 3kΩ
Gain vs Frequency
VS = ±22V, RF = 1.2kΩ
30042611
30042683
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Gain vs Frequency
VS = ±22V, RF = 2kΩ
Gain vs Frequency
VS = ±22V, RF = 3kΩ
30042685
30042684
Gain vs Frequency
VS = ±22V, RF = 800Ω
Gain vs Frequency
VS = ±22V, AV = –1
30042671
30042686
Gain vs Frequency
VS = ±22V, AV = –2
Gain vs Frequency
VS = ±22V, AV = –5
30042673
30042675
9
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Gain vs Frequency
VS = ±22V, AV = –10
30042670
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10
SLEW RATE CONSIDERATIONS
Application Information
A current feedback amplifier’s slew rate characteristics are
different than that of voltage feedback amplifiers. A voltage
feedback amplifier’s slew rate limiting or non-linear amplifier
behavior is dominated by the finite availability of the first stage
tail current charging the second stage voltage amplifier’s
compensation capacitor. Conversely, a current feedback
amplifier’s slew rate is not constant. Transient current at the
inverting input determines slew rate for both inverting and
non-inverting gains. The non-inverting configuration slew rate
is also determined by input stage limitations. Accordingly,
variations of slew rates occur for different circuit topologies.
GENERAL AMPLIFIER FUNCTION
oltage feedback amplifiers have a small-signal bandwidth that
is a function of the closed-loop gain. Conversely, the
LME49871 current feedback amplifier features a small-signal
bandwidth that is relatively independent of the closed-loop
gain. This is shown in Figure 1 where the LME49871’s gain
is –1,–2, –5 and –10. Like all current feedback amplifiers, the
LME49871’s closed-loop bandwidth is a function of the feed-
back resistance value. Therefore, Rs must be varied to select
the desired closed-loop gain.
DRIVING CAPACITIVE LOADS
POWER SUPPLY BYPASSING AND LAYOUT
CONSIDERATIONS
The LME49871 can drive significantly higher capacitive loads
than many current feedback amplifiers. Although the
LME49871 can directly drive as much as 100pF without os-
cillating, the resulting response will be a function of the feed-
back resistor value.
Properly placed and correctly valued supply bypassing is es-
sential for optimized high-speed amplifier operation. The sup-
ply bypassing must maintain a wideband, low-impedance
capacitive connection between the amplifier’s supply pin and
ground. This helps preserve high speed signal and fast tran-
sient fidelity. The bypassing is easily accomplished using a
parallel combination of a 10μF tantalum and a 0.1μF ceramic
capacitors for each power supply pin. The bypass capacitors
should be placed as close to the amplifier power supply pins
as possible.
CAPACITIVE FEEDBACK
It is quite common to place a small lead-compensation ca-
pacitor in parallel with a voltage feedback amplifier’s feedback
resistance, Rf. This compensation reduces the amplifier’s
peaking in the frequency domain and damps the transient re-
sponse. Whereas this yields the expected results when used
with voltage feedback amplifiers, this technique must not be
used with current feedback amplifiers. The dynamic
impedance of capacitors in the feedback loop reduces the
amplifier’s stability. Instead, reduced peaking in the frequency
response and bandwidth limiting can be accomplished by
adding an RC circuit to the amplifier’s input.
FEEDBACK RESISTOR SELECTION (Rf)
The value of the Rf, is also a dominant factor in compensating
the LME49871. For general applications, the LME49871 will
maintain specified performance with an 1.2kΩ feedback re-
sistor. Although this value will provide good results for most
applications, it may be advantageous to adjust this value
slightly for best pulse response optimized for the desired
bandwidth. In addition to reducing bandwidth, increasing the
feedback resistor value also reduces overshoot in the time
domain response.
300426p0
FIGURE 1. Bandwidth as a function of gain
11
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Revision History
Rev
1.0
Date
Description
04/24/08
04/28/08
Initial release.
1.01
Changed the Limit values on VIN-CM from –2.0 and +2.0 to –1.0 and +1.0.
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12
Physical Dimensions inches (millimeters) unless otherwise noted
SOIC Package
Order Number LME49871MA
NS Package Number M08A
13
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Notes
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