LF353 MWC - National Semiconductor

LF353

Wide Bandwidth Dual JFET Input Operational Amplifier

General Description

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

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.

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.

Features

nInternally trimmed offset voltage: 10 mV

nLow input bias current: 50pA

nLow input noise voltage: 25 nV/√Hz

nLow input noise current: 0.01 pA/√Hz

nWide gain bandwidth: 4 MHz

nHigh slew rate: 13 V/µs

nLow supply current: 3.6 mA

nHigh input impedance: 10

Ω

nLow total harmonic distortion : ≤0.02%

nLow 1/f noise corner: 50 Hz

nFast settling time to 0.01%: 2 µs

Typical Connection

00564914

Simplified Schematic

1/2 Dual

00564916

Connection Diagram

Dual-In-Line Package

00564917

Top View

Order Number LF353M, LF353MX or LF353N

See NS Package Number M08A or N08E

BI-FET II™is a trademark of National Semiconductor Corporation.

December 2003

LF353 Wide Bandwidth Dual JFET Input Operational Amplifier

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage ±18V

Power Dissipation (Note 2)

Operating Temperature Range 0˚C to +70˚C

(MAX) 150˚C

Differential Input Voltage ±30V

Input Voltage Range (Note 3) ±15V

Output Short Circuit Duration Continuous

Storage Temperature Range −65˚C to +150˚C

Lead Temp. (Soldering, 10 sec.) 260˚C

Soldering Information

Dual-In-Line Package

Soldering (10 sec.) 260˚C

Small Outline Package

Vapor Phase (60 sec.) 215˚C

Infrared (15 sec.) 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 8) 1000V

M Package TBD

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.

DC Electrical Characteristics

(Note 5)

Symbol Parameter Conditions LF353 Units

MIn Typ Max

Input Offset Voltage R

=10kΩ,T

=25˚C 5 10 mV

Over Temperature 13 mV

∆V

/∆T Average TC of Input Offset Voltage R

=10 kΩ10 µV/˚C

Input Offset Current T

=25˚C, (Notes 5, 6) 25 100 pA

≤70˚C 4 nA

Input Bias Current T

=25˚C, (Notes 5, 6) 50 200 pA

≤70˚C 8 nA

Input Resistance T

=25˚C 10

Ω

VOL

Large Signal Voltage Gain V

=±15V, T

=25˚C 25 100 V/mV

=±10V, R

=2 kΩ

Over Temperature 15 V/mV

Output Voltage Swing V

=±15V, R

=10kΩ±12 ±13.5 V

Input Common-Mode Voltage V

=±15V ±11 +15 V

Range −12 V

CMRR Common-Mode Rejection Ratio R

≤10kΩ70 100 dB

PSRR Supply Voltage Rejection Ratio (Note 7) 70 100 dB

Supply Current 3.6 6.5 mA

AC Electrical Characteristics

(Note 5)

Symbol Parameter Conditions LF353 Units

Min Typ Max

Amplifier to Amplifier Coupling T

=25˚C, f=1 Hz−20 kHz −120 dB

(Input Referred)

SR Slew Rate V

=±15V, T

=25˚C 8.0 13 V/µs

GBW Gain Bandwidth Product V

=±15V, T

=25˚C 2.7 4 MHz

Equivalent Input Noise Voltage T

=25˚C, R

=100Ω,16

f=1000 Hz

Equivalent Input Noise Current T

=25˚C, f=1000 Hz 0.01

LF353

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AC Electrical Characteristics (Continued)

(Note 5)

Symbol Parameter Conditions LF353 Units

Min Typ Max

THD Total Harmonic Distortion A

=+10, RL=10k,

=20Vp−p,

BW=20 Hz-20 kHz

<0.02 %

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 VS=±15V and 0˚C≤TA≤+70˚C. VOS,I

Band IOS are measured at VCM=0.

Note 6: The input bias currents are junction leakage currents which approximately double for every 10˚C increase in the junction temperature, Tj. Due to the limited

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, PD.T

j=TA+θjA PDwhere θjA is the thermal resistance from junction to ambient. Use of a heat sink is

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. VS

=±6V to ±15V.

Note 8: Human body model, 1.5 kΩin series with 100 pF.

Typical Performance Characteristics

Input Bias Current Input Bias Current

00564918 00564919

Supply Current Positive Common-Mode Input Voltage Limit

00564920

00564921

LF353

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Typical Performance Characteristics (Continued)

Negative Common-Mode Input Voltage Limit Positive Current Limit

00564922 00564923

Negative Current Limit Voltage Swing

00564924 00564925

Output Voltage Swing Gain Bandwidth

00564926 00564927

LF353

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Typical Performance Characteristics (Continued)

Bode Plot Slew Rate

00564928 00564929

Distortion vs. Frequency Undistorted Output Voltage Swing

00564930 00564931

Open Loop Frequency Response Common-Mode Rejection Ratio

00564932 00564933

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Typical Performance Characteristics (Continued)

Power Supply Rejection Ratio Equivalent Input Noise Voltage

00564934 00564935

Open Loop Voltage Gain (V/V) Output Impedance

00564936 00564937

Inverter Settling Time

00564938

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Pulse Response

Small Signaling Inverting

00564904

Large Signal Inverting

00564906

Small Signal Non-Inverting

00564905

Large Signal Non-Inverting

00564907

Current Limit (R

= 100Ω)

00564908

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

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.

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

LF353

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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.

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.

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 drivea2kΩload 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

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.

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.

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.

Detailed Schematic

00564909

LF353

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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

LF353

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Typical Applications (Continued)

Improved CMRR Instrumentation Amplifier

00564941

Fourth Order Low Pass Butterworth Filter

00564942

LF353

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Typical Applications (Continued)

Fourth Order High Pass Butterworth Filter

00564943

LF353

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Typical Applications (Continued)

Ohms to Volts Converter

00564944

LF353

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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

LF353

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Notes

LIFE SUPPORT POLICY

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:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products

Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification

(CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.

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LF353 Wide Bandwidth Dual JFET Input Operational Amplifier

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.