LF353N/NOPB [TI]
Wide Bandwidth Dual JFET Input Operational Amplifier;
| 型号： | LF353N/NOPB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Wide Bandwidth Dual JFET Input Operational Amplifier 放大器 光电二极管 |
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LF353
LF353 Wide Bandwidth Dual JFET Input Operational Amplifier
Literature Number: SNOSBH3D
December 2003
LF353
Wide Bandwidth Dual JFET Input Operational Amplifier
General Description
Features
n Internally trimmed offset voltage:
n Low input bias current:
n Low input noise voltage:
n Low input noise current:
n Wide gain bandwidth:
n High slew rate:
10 mV
50pA
These devices are low cost, high speed, dual JFET input
operational amplifiers with an internally trimmed input offset
™
voltage (BI-FET II technology). They require low supply
√
25 nV/ Hz
current yet maintain a large gain bandwidth product and fast
slew rate. In addition, well matched high voltage JFET input
devices provide very low input bias and offset currents. The
LF353 is pin compatible with the standard LM1558 allowing
designers to immediately upgrade the overall performance of
existing LM1558 and LM358 designs.
√
0.01 pA/ Hz
4 MHz
13 V/µs
3.6 mA
1012
Ω
≤0.02%
50 Hz
2 µs
n Low supply current:
n High input impedance:
n Low total harmonic distortion :
n Low 1/f noise corner:
n Fast settling time to 0.01%:
These amplifiers may be used in applications such as high
speed integrators, fast D/A converters, sample and hold
circuits and many other circuits requiring low input offset
voltage, low input bias current, high input impedance, high
slew rate and wide bandwidth. The devices also exhibit low
noise and offset voltage drift.
Typical Connection
Connection Diagram
Dual-In-Line Package
00564917
00564914
Top View
Order Number LF353M, LF353MX or LF353N
See NS Package Number M08A or N08E
Simplified Schematic
1/2 Dual
00564916
™
BI-FET II is a trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS005649
www.national.com
Absolute Maximum Ratings (Note 1)
Small Outline Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
215˚C
220˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Supply Voltage
18V
(Note 2)
Power Dissipation
Operating Temperature Range
Tj(MAX)
0˚C to +70˚C
150˚C
ESD Tolerance (Note 8)
1000V
TBD
θJA M Package
Differential Input Voltage
Input Voltage Range (Note 3)
Output Short Circuit Duration
Storage Temperature Range
Lead Temp. (Soldering, 10 sec.)
Soldering Information
Dual-In-Line Package
Soldering (10 sec.)
30V
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. Elec-
trical Characteristics state DC and AC electrical specifications under particu-
lar test conditions which guarantee specific performance limits. This assumes
that the device is within the Operating Ratings. Specifications are not guar-
anteed for parameters where no limit is given, however, the typical value is a
good indication of device performance.
15V
Continuous
−65˚C to +150˚C
260˚C
260˚C
DC Electrical Characteristics
(Note 5)
Symbol
Parameter
Input Offset Voltage
Conditions
LF353
Typ
5
Units
MIn
Max
10
VOS
RS=10kΩ, TA=25˚C
Over Temperature
RS=10 kΩ
mV
mV
µV/˚C
pA
13
∆VOS/∆T
Average TC of Input Offset Voltage
Input Offset Current
10
25
IOS
Tj=25˚C, (Notes 5, 6)
Tj≤70˚C
100
4
nA
IB
Input Bias Current
Tj=25˚C, (Notes 5, 6)
Tj≤70˚C
50
200
8
pA
nA
RIN
Input Resistance
Tj=25˚C
1012
100
Ω
AVOL
Large Signal Voltage Gain
VS= 15V, TA=25˚C
VO= 10V, RL=2 kΩ
Over Temperature
VS= 15V, RL=10kΩ
VS= 15V
25
V/mV
15
12
11
V/mV
V
VO
Output Voltage Swing
Input Common-Mode Voltage
Range
13.5
+15
−12
100
100
3.6
VCM
V
V
CMRR
PSRR
IS
Common-Mode Rejection Ratio
Supply Voltage Rejection Ratio
Supply Current
RS≤ 10kΩ
70
70
dB
dB
mA
(Note 7)
6.5
AC Electrical Characteristics
(Note 5)
Symbol
Parameter
Conditions
LF353
Typ
Units
Min
Max
Amplifier to Amplifier Coupling
TA=25˚C, f=1 Hz−20 kHz
(Input Referred)
−120
dB
SR
Slew Rate
VS= 15V, TA=25˚C
VS= 15V, TA=25˚C
TA=25˚C, RS=100Ω,
f=1000 Hz
8.0
2.7
13
4
V/µs
MHz
GBW
en
Gain Bandwidth Product
Equivalent Input Noise Voltage
16
in
Equivalent Input Noise Current
Tj=25˚C, f=1000 Hz
0.01
www.national.com
2
AC Electrical Characteristics (Continued)
(Note 5)
Symbol
Parameter
Conditions
AV=+10, RL=10k,
LF353
Typ
Units
Min
Max
<
THD
Total Harmonic Distortion
0.02
%
VO=20Vp−p,
BW=20 Hz-20 kHz
Note 2: For operating at elevated temperatures, the device must be derated based on a thermal resistance of 115˚C/W typ junction to ambient for the N package,
and 158˚C/W typ junction to ambient for the H package.
Note 3: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
Note 4: The power dissipation limit, however, cannot be exceeded.
Note 5: These specifications apply for V = 15V and 0˚C≤T ≤+70˚C. V , I and I
are measured at V =0.
CM
S
A
OS
B
OS
Note 6: The input bias currents are junction leakage currents which approximately double for every 10˚C increase in the junction temperature, T . Due to the limited
j
production test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient
temperature as a result of internal power dissipation, P . T =T +θ
P
where θ is the thermal resistance from junction to ambient. Use of a heat sink is
D
j
A
jA
D jA
recommended if input bias current is to be kept to a minimum.
Note 7: Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice. V
S
=
6V to 15V.
Note 8: Human body model, 1.5 kΩ in series with 100 pF.
Typical Performance Characteristics
Input Bias Current
Input Bias Current
00564918
00564919
Supply Current
Positive Common-Mode Input Voltage Limit
00564921
00564920
3
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Typical Performance Characteristics (Continued)
Negative Common-Mode Input Voltage Limit
Positive Current Limit
00564922
00564923
Negative Current Limit
Voltage Swing
00564925
00564924
Output Voltage Swing
Gain Bandwidth
00564926
00564927
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4
Typical Performance Characteristics (Continued)
Bode Plot
Slew Rate
00564929
00564928
Distortion vs. Frequency
Undistorted Output Voltage Swing
00564931
00564930
Open Loop Frequency Response
Common-Mode Rejection Ratio
00564933
00564932
5
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Typical Performance Characteristics (Continued)
Power Supply Rejection Ratio
Equivalent Input Noise Voltage
00564935
00564934
Open Loop Voltage Gain (V/V)
Output Impedance
00564936
00564937
Inverter Settling Time
00564938
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6
Pulse Response
Small Signal Non-Inverting
Small Signaling Inverting
00564905
00564904
Large Signal Non-Inverting
Large Signal Inverting
00564907
00564906
Current Limit (RL = 100Ω)
00564908
supply voltages. However, neither of the input voltages
should be allowed to exceed the negative supply as this will
cause large currents to flow which can result in a destroyed
unit.
Application Hints
These devices are op amps with an internally trimmed input
offset voltage and JFET input devices (BI-FET II). These
JFETs have large reverse breakdown voltages from gate to
source and drain eliminating the need for clamps across the
inputs. Therefore, large differential input voltages can easily
be accommodated without a large increase in input current.
The maximum differential input voltage is independent of the
Exceeding the negative common-mode limit on either input
will force the output to a high state, potentially causing a
reversal of phase to the output. Exceeding the negative
common-mode limit on both inputs will force the amplifier
output to a high state. In neither case does a latch occur
7
www.national.com
or that the unit is not inadvertently installed backwards in a
socket as an unlimited current surge through the resulting
forward diode within the IC could cause fusing of the internal
conductors and result in a destroyed unit.
Application Hints (Continued)
since raising the input back within the common-mode range
again puts the input stage and thus the amplifier in a normal
operating mode.
As with most amplifiers, care should be taken with 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 “pick-up” and maximize the frequency of the feed-
back pole by minimizing the capacitance from the input to
ground.
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 high state.
The amplifiers will operate with a common-mode input volt-
age equal to the positive supply; however, the gain band-
width and slew rate may be decreased in this condition.
When the negative common-mode voltage swings to within
3V of the negative supply, an increase in input offset voltage
may occur.
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 6 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.
Each amplifier is individually biased by a zener reference
which allows normal circuit operation on 6V power sup-
plies. Supply voltages less than these may result in lower
gain bandwidth and slew rate.
The amplifiers will drive a 2 kΩ load resistance to 10V over
the full temperature range of 0˚C to +70˚C. If the amplifier is
forced to drive heavier load currents, however, an increase
in input offset voltage may occur on the negative voltage
swing and finally reach an active current limit on both posi-
tive and negative swings.
Precautions should be taken to ensure that the power supply
for the integrated circuit never becomes reversed in polarity
Detailed Schematic
00564909
www.national.com
8
Typical Applications
Three-Band Active Tone Control
00564939
00564940
Note 1: All controls flat.
Note 2: Bass and treble boost, mid flat.
Note 3: Bass and treble cut, mid flat.
Note 4: Mid boost, bass and treble flat.
Note 5: Mid cut, bass and treble flat.
•
•
All potentiometers are linear taper
Use the LF347 Quad for stereo applications
9
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Typical Applications (Continued)
Improved CMRR Instrumentation Amplifier
00564941
Fourth Order Low Pass Butterworth Filter
00564942
www.national.com
10
Typical Applications (Continued)
Fourth Order High Pass Butterworth Filter
00564943
11
www.national.com
Typical Applications (Continued)
Ohms to Volts Converter
00564944
www.national.com
12
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LF353M or LF353MX
NS Package Number M08A
Molded Dual-In-Line Package
Order Number LF353N
NS Package N08E
13
www.national.com
Notes
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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can be reasonably expected to cause the failure of
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