LP324MTX [NSC]
Micropower Quad Operational Amplifier; 微功耗四路运算放大器
| 型号： | LP324MTX |
| 厂家： | 
National Semiconductor |
| 描述： | Micropower Quad Operational Amplifier |
| 文件： | 总11页 (文件大小：367K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
July 2001
LP324/LP2902
Micropower Quad Operational Amplifier
General Description
Features
n Low supply current: 85µA (typ)
n Low offset voltage: 2mV (typ)
n Low input bias current: 2nA (typ)
n Input common mode to GND
The LP324 series consists of four independent, high gain
internally compensated micropower operational amplifiers.
These amplifiers are specially suited for operation in battery
systems while maintaining good input specifications, and
extremely low supply current drain. In addition, the LP324
has an input common mode range, and output source range
which includes ground, making it ideal in single supply ap-
plications.
n Interfaces to CMOS logic
n Wide supply range: 3V
n Small Outline Package available
n Pin-for-pin compatible with LM324
+
<
<
32V
V
These amplifiers are ideal in applications which include por-
table instrumentation, battery backup equipment, and other
circuits which require good DC performance and low supply
current.
Connection Diagrams
Dual-In-Line (N) and SO (M)
14-Pin TSSOP
00856201
Order Number LP324M or LP2902M
See NS Package Number M14A
Order Number LP324N or LP2902N
See NS Package Number N14A
00856240
Order Number LP324MT and LP324MTX
See NS Package Number MTC14
Simplified Schematic
00856202
© 2001 National Semiconductor Corporation
DS008562
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V+ ≤ 15V and TA = 25˚C
±
ESD Susceptibility (Note 10)
500V
Operating Conditions
TJMAX
Supply Voltage
150˚C
±
32V or 16V
LP324
θJA (Note 4)
±
LP2902
26V or 13V
MT Package
154˚C/W
90˚C/W
Differential Input Voltage
LP324
N Package
32V
26V
M Package
140˚C/W
LP2902
Operating Temp. Range
Storage Temp. Range
Soldering Information
Wave Soldering(10sec)
Convection or Infrared(20sec)
(Note 5)
Input Voltage (Note 2)
LP324
−65˚C≤TJ≤ 150˚C
−0.3V to 32V
−0.3V to 26V
Continuous
LP2902
260˚C(lead temp.)
235˚C
Output Short-Circuit to GND
(One Amplifier) (Note 3)
Electrical Characteristics (Note 6)
LP2902 (Note 9)
Tested Design
Limit Limit
(Note 7) (Note 8)
LP324
Symbol
Parameter
Conditions
Tested
Limit
Design
Limit
Units
Typ
2
Typ
2
Limits
(Note 7) (Note 8)
VOS
IB
Input Offset
4
20
4
10
4
10
2
9
mV
(Max)
nA
Voltage
Input Bias Current
2
40
2
20
(Max)
nA
IOS
Input Offset Current
Voltage Gain
0.5
70
90
90
85
3.6
0.7
10
5
8
0.2
100
90
90
85
3.6
0.7
10
5
4
(Max)
V/mV
(Min)
dB
AVOL
RL = 10k to GND
V+ = 30V
V+ = 30V, 0V ≤ VCM
40
80
80
150
3.4
0.8
7
30
50
80
80
150
3.4
0.8
7
40
CMRR Common Mode Rej.
Ratio
75
75
+
<
VCM V − 1.5
(Min)
dB
PSRR
Power Supply Rej.
Ratio
V+ = 5V to 30V
75
75
(Min)
µA
∞
IS
Supply Current
RL
=
250
V+−1.9V
1.0
4
250
V+−1.9V
1.0
4
(Max)
V
VO
Output Voltage
Swing
IL = 350µA to GND
VCM = 0V
IL = 350µA to V+
(Min)
V
VCM = 0V
(Max)
mA
IOUT
Output Source
VO = 3V
Source Current
VIN (diff) = 1V
VO = 1.5V
(Min)
mA
IOUT
Sink
IOUT
Sink
Output Sink Current
Output Sink Current
4
3
4
3
VIN (diff) = 1V
VO = 1.5V
(Min)
mA
4
2
1
4
2
1
VCM = 0V
(Min)
mA
ISOURCE Output Short to GND VIN (diff) = 1V
20
15
10
10
25
35
30
35
20
15
10
10
25
35
30
35
(Max)
mA
ISINK
Output Short to V+
VIN (diff) = 1V
45
45
(Max)
µV/C˚
VOS
Drift
IOS
pA/C˚
Drift
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2
Electrical Characteristics (Note 6) (Continued)
LP2902 (Note 9)
LP324
Tested
Limit
Symbol
Parameter
Conditions
Tested
Limit
Design
Limit
Design
Limit
Units
Typ
100
50
Typ
100
50
Limits
(Note 7) (Note 8)
(Note 7) (Note 8)
GBW
SR
Gain Bandwidth
Product
KHz
Slew Rate
V/mS
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
−
Note 2: The input voltage is not allowed to go more than −0.3V below V (GND) as this will turn on a parasitic transistor causing large currents to flow through the
device.
Note 3: Short circuits from the output to GND can cause excessive heating and eventual destruction. The maximum sourcing output current is approximately 30 mA
+
independent of the magnitude of V . At values of supply voltage in excess of 15 V , continuous short-circuit to GND can exceed the power dissipation ratings
DC
(particularly at elevated temperatures) and cause eventual destruction. Destructive dissipation can result from simultaneous shorts on all amplifiers.
Note 4: For operation at elevated temperatures, these devices must be derated based on a thermal resistance of θ and T max. T = T + θ
P .
D
JA
J
J
A
JA
Note 5: The LP2902 may be operated from −40˚C ≤ T ≤ +85˚C, and the LP324 may be operated from 0˚C ≤ T ≤ +70˚C.
A
A
+
Note 6: Boldface numbers apply at temperature extremes. All other numbers apply only at T = T = 25˚C, V = 5V, V = V/2, and R =100k connected to GND
A
J
cm
L
unless otherwise specified.
Note 7: Guaranteed and 100% production tested.
Note 8: Guaranteed (but not 100% production tested) over the operating supply voltage range (3.0V to 32V for the LP324, LP324, and 3.0V to 26V for the LP2902),
+
and the common mode range (0V to V −1.5V), unless otherwise specified. These limits are not used to calculate outgoing quality levels.
Note 9: The LP2902 operating supply range is 3V to 26V, and is not tested above 26V.
Note 10: The test circuit used consists of the human body model of 100 pF in series with 1500Ω.
3
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Typical Performance Curves
Input Voltage Range
Input Current
00856221
00856222
Supply Current
Voltage Gain
00856224
00856223
Open Loop
Frequency Response
Power Supply
Rejection Ratio
00856225
00856226
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4
Typical Performance Curves (Continued)
Voltage Follower
Pulse Response
Voltage Follower Pulse
Response (Small Signal)
00856228
00856227
Common Mode
Rejection Ratio
Large Signal
Frequency Response
00856230
00856229
Output Characteristics
Current Sourcing
Output Characteristics
Current Sinking
00856231
00856232
5
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Typical Performance Curves
(Continued)
Current Limiting
00856233
Application Hints
The LP324 series is a micro-power pin-for-pin equivalent to
the LM324 op amps. Power supply current, input bias cur-
rent, and input offset current have all been reduced by a
factor of 10 over the LM324. Like its predecessor, the LP324
series op amps can operate on single supply, have
true-differential inputs, and remain in the linear mode with an
metal fusing, but rather due to the large increase in IC chip
dissipation which will cause eventual failure due to exces-
sive junction temperatures. For example: If all four amplifiers
were simultaneously shorted to ground on a 10V supply the
junction temperature would rise by 110˚C.
Exceeding the negative common-mode limit on either input
will cause a reversal of phase to the output and force the
amplifier to the corresponding high or low state. Exceeding
the negative common-mode limit on both inputs will force the
amplifier output to a high state. Exceeding the positive
common-mode limit on a single input will not change the
phase of the output. However, if both inputs exceed the limit,
the output of the amplifier will be forced to a low state. In
neither case does a latch occur since returning the input
within the common mode range puts the input stage and
thus the amplifier in a normal operating mode.
input common-mode voltage of 0 VDC
.
The pinouts of the package have been designed to simplify
PC board layouts. Inverting inputs are adjacent to outputs for
all of the amplifiers and the outputs have also been placed at
the corners of the package (pins 1, 7, 8, and 14).
Precautions should be taken to insure that the power supply
for the integrated circuit never becomes reversed in polarity
or the unit is not inadvertently installed backwards in the test
socket as an unlimited current surge through the resulting
forward diode within the IC could destroy the unit.
The circuits presented in the section on typical applications
emphasize operation on only a single power supply voltage.
If complementary power supplies are available, all of the
standard op amp circuits can be used. In general, introduc-
ing a pseudo-ground (a bias voltage reference to V+/2) will
allow operation above and below this value in single power
supply systems. Many application circuits are shown which
take advantage of the wide input common-mode voltage
range which includes ground. In most cases, input biasing is
not required and input voltages which range to ground can
easily be accommodated.
Large differential input voltages can be easily accommo-
dated and, as input differential voltage protection diodes are
not needed, no large input currents result from large differ-
ential input voltages. The differential input voltage may be
larger than V+ without damaging the device. Protection
should be provided to prevent the input voltages from going
negative more than −0.3 VDC (at 25˚C). An input clamp diode
with a resistor to the IC input terminal can be used.
The amplifiers have a class B output stage which allows the
amplifiers to both source and sink output currents. In appli-
cations where crossover distortion is undesirable, a resistor
should be used from the output of the amplifier to ground.
The resistor biases the output into class A operation.
Driving CMOS
The LP324 has improved stability margin for driving capaci-
tive loads. No special precautions are needed to drive loads
in the 50 pF to 1000 pF range. It should be noted however
that since the power supply current has been reduced by a
factor of 10, so also has the slew rate and gain bandwidth
product. This reduction can cause reduced performance in
AC applications where the LM324 is being replaced by an
LP324. Such situations usually occur when the LM324 has
been operated near its power bandwidth.
00856203
Output short circuits either to ground or to the positive power
supply should be of short time duration. Units can be de-
stroyed, not as a result of the short circuit current causing
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6
Application Hints (Continued)
Differential Integrator
Comparator with Hysteresis
00856206
Non-Inverting Amplifier
00856209
Howland Current Pump
00856204
Adder/Subtractor
00856210
Bridge Current Amplifier
00856207
Unity Gain Buffer
00856205
Positive Integrator
00856211
µ Power Current Source
00856208
00856212
7
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Application Hints (Continued)
Lowpass Filter
00856213
1 kHz Bandpass Active Filter
00856214
Band-Reject Filter
00856215
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8
Application Hints (Continued)
Pulse Generator
00856216
Window Comparator
00856217
9
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Physical Dimensions inches (millimeters)
unless otherwise noted
S.O. Package (M)
Order Number LP324M, LP324MX, LP2902M or LP2902MX
NS Package Number M14A
Dual-in-Line Package (N)
Order Number LP324N or LP2902N
NS Package Number N14A
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10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
14-Pin TSSOP
Order Number LP324MT and LP324MTX
NS Package Number MTC14
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