LM248 [NSC]
Quad 741 Op Amps LM149 Wide Band Decompensated (AV MIN = 5); 741四运算放大器LM149宽带失代偿（AV MIN = 5 ）
| 型号： | LM248 |
| 厂家： | 
National Semiconductor |
| 描述： | Quad 741 Op Amps LM149 Wide Band Decompensated (AV MIN = 5) |
| 文件： | 总15页 (文件大小：387K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2003
LM148/LM248/LM348
Quad 741 Op Amps
General Description
The LM148 series is a true quad 741. It consists of four
independent, high gain, internally compensated, low power
operational amplifiers which have been designed to provide
functional characteristics identical to those of the familiar
741 operational amplifier. In addition the total supply current
for all four amplifiers is comparable to the supply current of a
single 741 type op amp. Other features include input offset
currents and input bias current which are much less than
those of a standard 741. Also, excellent isolation between
amplifiers has been achieved by independently biasing each
amplifier and using layout techniques which minimize ther-
mal coupling.
Features
n 741 op amp operating characteristics
n Class AB output stage—no crossover distortion
n Pin compatible with the LM124
n Overload protection for inputs and outputs
n Low supply current drain:
n Low input offset voltage:
n Low input offset current:
n Low input bias current
n High degree of isolation between amplifiers:
n Gain bandwidth product
0.6 mA/Amplifier
1 mV
4 nA
30 nA
120 dB
n
LM148 (unity gain):
1.0 MHz
The LM148 can be used anywhere multiple 741 or 1558 type
amplifiers are being used and in applications where amplifier
matching or high packing density is required. For lower
power refer to LF444.
Schematic Diagram
00778601
* 1 pF in the LM149
© 2003 National Semiconductor Corporation
DS007786
www.national.com
Distributors for availability and specifications.
Absolute Maximum Ratings (Note 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
LM148
LM248
18V
LM348
Supply Voltage
22V
44V
18V
36V
Differential Input Voltage
Output Short Circuit Duration (Note 1)
Power Dissipation (Pd at 25˚C) and
Thermal Resistance (θjA), (Note 2)
Molded DIP (N) Pd
36V
Continuous
Continuous
Continuous
—
—
—
—
750 mW
100˚C/W
θjA
Cavity DIP (J) Pd
1100 mW
110˚C/W
800 mW
700 mW
θJA
110˚C/W
110˚C/W
Maximum Junction Temperature (TjMAX
Operating Temperature Range
Storage Temperature Range
)
150˚C
110˚C
100˚C
−55˚C ≤ TA ≤ +125˚C
−65˚C to +150˚C
300˚C
−25˚C ≤ TA ≤ +85˚C
−65˚C to +150˚C
300˚C
0˚C ≤ TA ≤ +70˚C
−65˚C to +150˚C
300˚C
Lead Temperature (Soldering, 10 sec.) Ceramic
Lead Temperature (Soldering, 10 sec.) Plastic
Soldering Information
260˚C
Dual-In-Line Package
Soldering (10 seconds)
260˚C
260˚C
260˚C
Small Outline Package
Vapor Phase (60 seconds)
Infrared (15 seconds)
215˚C
220˚C
215˚C
220˚C
215˚C
220˚C
See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface
mount
devices.
ESD tolerance (Note 5)
500V
500V
500V
Electrical Characteristics
(Note 3)
Parameter
Conditions
LM148
LM248
LM348
Units
Min Typ Max Min Typ Max Min Typ Max
1.0 5.0 1.0 6.0 1.0 6.0
25 50 50
30 100 30 200 30 200
0.8 2.5 0.8 2.5 0.8 2.5
2.4 3.6 2.4 4.5 2.4 4.5
50 160 25 160 25 160
Input Offset Voltage
Input Offset Current
Input Bias Current
TA = 25˚C, RS ≤ 10 kΩ
TA = 25˚C
mV
nA
4
4
4
TA = 25˚C
nA
Input Resistance
TA = 25˚C
MΩ
mA
Supply Current All Amplifiers
Large Signal Voltage Gain
TA = 25˚C, VS
TA = 25˚C, VS
=
=
15V
15V
V/mV
VOUT
=
10V, RL ≥ 2 kΩ
Amplifier to Amplifier
Coupling
TA = 25˚C, f = 1 Hz to 20 kHz
(Input Referred) See Crosstalk
Test Circuit
−120
1.0
60
−120
1.0
60
−120
1.0
60
dB
MHz
Small Signal Bandwidth
Phase Margin
TA = 25˚C,
LM148 Series
TA = 25˚C,
degrees
V/µs
LM148 Series (AV = 1)
TA = 25˚C,
Slew Rate
0.5
25
0.5
25
0.5
25
LM148 Series (AV = 1)
TA = 25˚C
Output Short Circuit Current
Input Offset Voltage
mA
mV
nA
RS ≤ 10 kΩ
6.0
75
7.5
7.5
Input Offset Current
125
100
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2
Electrical Characteristics (Continued)
(Note 3)
Parameter
Conditions
LM148
Min Typ Max Min Typ Max Min Typ Max
325 500 400
LM248
LM348
Units
Input Bias Current
nA
Large Signal Voltage Gain
Output Voltage Swing
VS
=
15V, VOUT
=
10V,
25
15
15
V/mV
>
=
RL 2 kΩ
VS 15V, RL = 10 kΩ
RL = 2 kΩ
VS 15V
12
13
12
12
13
12
12
13
12
V
V
10
12
10
12
10
12
Input Voltage Range
Common-Mode Rejection
Ratio
=
V
RS ≤ 10 kΩ
70
90
70
90
70
90
dB
Supply Voltage Rejection
RS ≤ 10 kΩ, 5V ≤ VS
≤
15V
77
96
77
96
77
96
dB
Note 1: Any of the amplifier outputs can be shorted to ground indefinitely; however, more than one should not be simultaneously shorted as the maximum junction
temperature will be exceeded.
Note 2: The maximum power dissipation for these devices must be derated at elevated temperatures and is dicated by T
, θ , and the ambient temperature,
JMAX JA
T . The maximum available power dissipation at any temperature is P = (T
− T )/θ or the 25˚C P
, whichever is less.
A
d
JMAX
A
JA
DMAX
Note 3: These specifications apply for V
=
15V and over the absolute maximum operating temperature range (T ≤ T ≤ T ) unless otherwise noted.
L A H
S
Note 4: Refer to RETS 148X for LM148 military specifications.
Note 5: Human body model, 1.5 kΩ in series with 100 pF.
Cross Talk Test Circuit VS
=
15V
00778606
00778607
00778643
3
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Typical Performance Characteristics
Supply Current
Input Bias Current
00778623
00778624
Voltage Swing
Positive Current Limit
00778625
00778626
Negative Current Limit
Output Impedance
00778628
00778627
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4
Typical Performance Characteristics (Continued)
Common-Mode Rejection Ratio
Open Loop Frequency Response
00778629
00778630
Bode Plot LM148
Large Signal Pulse Response (LM148)
00778633
00778631
Small Signal Pulse Response (LM148)
Undistorted Output Voltage Swing
00778635
00778637
5
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Typical Performance Characteristics (Continued)
Gain Bandwidth
Slew Rate
00778638
00778639
Inverting Large Signal Pulse Response (LM148)
Input Noise Voltage and Noise Current
00778641
00778642
Positive Common-Mode Input Voltage Limit
Negative Common-Mode Input Voltage Limit
00778605
00778643
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6
The output current of each amplifier in the package is limited.
Short circuits from an output to either ground or the power
supplies will not destroy the unit. However, if multiple output
shorts occur simultaneously, the time duration should be
short to prevent the unit from being destroyed as a result of
excessive power dissipation in the IC chip.
Application Hints
The LM148 series are quad low power 741 op amps. In the
proliferation of quad op amps, these are the first to offer the
convenience of familiar, easy to use operating characteris-
tics of the 741 op amp. In those applications where 741 op
amps have been employed, the LM148 series op amps can
be employed directly with no change in circuit performance.
As with most amplifiers, care should be taken lead dress,
component placement and supply decoupling in order to
ensure stability. For example, resistors from the output to an
input should be placed with the body close to the input to
minimize “pickup” and maximize the frequency of the feed-
back pole which capacitance from the input to ground cre-
ates.
The package pin-outs are such that the inverting input of
each amplifier is adjacent to its output. In addition, the
amplifier outputs are located in the corners of the package
which simplifies PC board layout and minimizes package
related capacitive coupling between amplifiers.
The input characteristics of these amplifiers allow differential
input voltages which can exceed the supply voltages. In
addition, if either of the input voltages is within the operating
common-mode range, the phase of the output remains cor-
rect. If the negative limit of the operating common-mode
range is exceeded at both inputs, the output voltage will be
positive. For input voltages which greatly exceed the maxi-
mum supply voltages, either differentially or common-mode,
resistors should be placed in series with the inputs to limit
the current.
A feedback pole is created when the feedback around any
amplifier is resistive. The parallel resistance and capacitance
from the input of the device (usually the inverting input) to AC
ground set the frequency of the pole. In many instances the
frequency of this pole is much greater than the expected 3
dB frequency of the closed loop gain and consequently there
is negligible effect on stability margin. However, if the feed-
back pole is less than approximately six times the expected
3 dB frequency a lead capacitor should be placed from the
output to the input of the op amp. The value of the added
capacitor should be such that the RC time constant of this
capacitor and the resistance it parallels is greater than or
equal to the original feedback pole time constant.
Like the LM741, these amplifiers can easily drive a 100 pF
capacitive load throughout the entire dynamic output voltage
and current range. However, if very large capacitive loads
must be driven by a non-inverting unity gain amplifier, a
resistor should be placed between the output (and feedback
connection) and the capacitance to reduce the phase shift
resulting from the capacitive loading.
Typical Applications—LM148
One Decade Low Distortion Sinewave Generator
00778608
f
= 5 kHz, THD ≤ 0.03%
MAX
R1 = 100k pot. C1 = 0.0047 µF, C2 = 0.01 µF, C3 = 0.1 µF, R2 = R6 = R7 = 1M,
R3 = 5.1k, R4 = 12Ω, R5 = 240Ω, Q = NS5102, D1 = 1N914, D2 = 3.6V avalanche
diode (ex. LM103), V
=
15V
S
A simpler version with some distortion degradation at high frequencies can be made by using A1 as a simple inverting amplifier, and by putting back to back
zeners in the feedback loop of A3.
7
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Typical Applications—LM148 (Continued)
Low Cost Instrumentation Amplifier
00778609
V
S
=
15V
R = R2, trim R2 to boost CMRR
Low Drift Peak Detector with Bias Current Compensation
00778610
Adjust R for minimum drift
D3 low leakage diode
D1 added to improve speed
V
S
=
15V
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8
Typical Applications—LM148 (Continued)
Universal State-Variable Filter
00778611
Tune Q through R0,
4
For predictable results: f Q ≤ 4 x 10
O
Use Band Pass output to tune for Q
9
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Typical Applications—LM148 (Continued)
A 1 kHz 4 Pole Butterworth
00778612
Use general equations, and tune each section separately
= 0.541, Q = 1.306
Q
1stSECTION
2ndSECTION
The response should have 0 dB peaking
A 3 Amplifier Bi-Quad Notch Filter
00778613
Ex: f
= 3 kHz, Q = 5, R1 = 270k, R2 = R3 = 20k, R4 = 27k, R5 = 20k, R6 = R8 = 10k, R7 = 100k, C1 = C2 = 0.001 µF
NOTCH
Better noise performance than the state-space approach.
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10
Typical Applications—LM148 (Continued)
A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros)
00778614
R1C1 = R2C2 = t
R'1C'1 = R'2C'2 = t'
f
C
= 1 kHz, f = 2 kHz, f = 0.543, f = 2.14, Q = 0.841, f' = 0.987, f' = 4.92, Q' = 4.403, normalized to ripple BW
S p Z P Z
Use the BP outputs to tune Q, Q', tune the 2 sections separately
R1 = R2 = 92.6k, R3 = R4 = R5 = 100k, R6 = 10k, R0 = 107.8k, R = 100k, R = 155.1k,
L
H
R'1 = R'2 = 50.9k, R'4 = R'5 = 100k, R'6 = 10k, R'0 = 5.78k, R' = 100k, R' = 248.12k, R'f = 100k. All capacitors are 0.001 µF.
L
H
Lowpass Response
00778615
11
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Typical Simulation
LM148, LM741 Macromodel for Computer Simulation
00778621
For more details, see IEEE Journal of Solid-State Circuits, Vol. SC-9, No. 6, December 1974
−16
Note 6:
Note 7:
= 112I = 8 x 10
S
o1
= 144*C2 = 6 pF for LM149
o2
00778622
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12
Connection Diagram
00778602
Top View
Order Number LM148J, LM148J/883, LM248J, LM348M, or LM348N
See NS Package Number J14A, M14A or N14A
LM148J is available per JM38510/11001
13
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Physical Dimensions inches (millimeters)
unless otherwise noted
Ceramic Dual-In-Line Package (J)
Order Number LM148J, LM148J/883, LM248J
NS Package Number J14A
S.O. Package (M)
Order Number LM348M or LM348MX
NS Package Number M14A
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14
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number LM348N
NS Package Number N14A
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