lf442mh/883 National Semiconductor Corporation, lf442mh/883 Datasheet

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lf442mh/883

Manufacturer Part Number
lf442mh/883
Description
Dual Low Power Jfet Input Operational Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2010 National Semiconductor Corporation
Dual Low Power JFET Input Operational Amplifier
General Description
The LF442 dual low power operational amplifier provides
many of the same AC characteristics as the industry standard
LM1458 while greatly improving the DC characteristics of the
LM1458. The amplifier has the same bandwidth, slew rate,
and gain (10 kΩ load) as the LM1458 and only draws one
tenth the supply current of the LM1458. In addition the well
matched high voltage JFET input devices of the LF442 reduce
the input bias and offset currents by a factor of 10,000 over
the LM1458. A combination of careful layout design and in-
ternal trimming guarantees very low input offset voltage and
voltage drift. The LF442 also has a very low equivalent input
noise voltage for a low power amplifier.
The LF442 is pin compatible with the LM1458 allowing an im-
mediate 10 times reduction in power drain in many applica-
tions. The LF442 should be used where low power dissipation
and good electrical characteristics are the major considera-
tions.
Ordering Information
Typical Connection
BI-FET II™ is a trademark of National Semiconductor Corporation.
NS Paart Number
LF442MH/883
5962-9763301QGA
SMD Part Number
201494
20149401
LF442QML
NS Package Number
Features
Connection Diagram
Pin 4 connected to case
1/10 supply current of a LM1458:  400 μA (max)
Low input bias current: 50 pA (Typ)
Low input offset voltage: 1 mV (Typ)
Low input offset voltage drift: 7 μV/°C (Typ)
High gain bandwidth: 1 MHz (Typ)
High slew rate: 1 V/μs (Typ)
Low noise voltage for low power:
Low input noise current:
High input impedance: 10
H08C
See NS Package Number H08C
Metal Can Package
Top View
8LD T0–99 Metal Can
12
Ω
Package Description
December 16, 2010
20149402
(Typ)
www.national.com
(Typ)

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lf442mh/883 Summary of contents

Page 1

... The LF442 should be used where low power dissipation and good electrical characteristics are the major considera- tions. Ordering Information NS Paart Number SMD Part Number LF442MH/883 5962-9763301QGA Typical Connection BI-FET II™ trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation LF442QML Features ■ ...

Page 2

Simplified Schematic Detailed Schematic www.national.com 1/2 Dual 20149403 1/2 Dual 20149416 2 ...

Page 3

Absolute Maximum Ratings Supply Voltage Differential Input Voltage Input Voltage Range (Note 3) Output Short Circuit Duration (Note 4) Maximum Power Dissipation (Note 2) T max J Thermal Resistance   θ JA Still Air 500LF/Min Air flow   θ JC Operating Temperature ...

Page 4

LF442 Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. V Symbol Parameter I Supply Current CC V Input Offset Voltage IO ±I Input Bias Current IB I Input Offset Current IO CMRR Common Mode Rejection Ratio PSRR ...

Page 5

Typical Performance Characteristics Input Bias Current Supply Current Negative Common-Mode Input Voltage Limit 20149417 Positive Common-Mode Input Voltage Limit 20149419 Positive Current Limit 20149421 5 Input Bias Current 20149418 20149420 20149422 www.national.com ...

Page 6

Negative Current Limit Output Voltage Swing Bode Plot www.national.com Output Voltage Swing 20149423 20149425 20149427 6 20149424 Gain Bandwidth 20149426 Slew Rate 20149428 ...

Page 7

Distortion vs Frequency 20149429 Open Loop Frequency Response 20149431 Power Supply Rejection Ratio 20149433 Undistorted Output Voltage Swing Common-Mode Rejection Ratio Equivalent Input Noise Voltage 7 20149430 20149432 20149434 www.national.com ...

Page 8

Open Loop Voltage Gain Inverter Settling Time www.national.com Output Impedance 20149435 20149437 8 20149436 ...

Page 9

Pulse Response kΩ Small Signal Inverting Large Signal Inverting Small Signal Non-Inverting 20149407 Large Signal Non-Inverting 20149409 9 20149408 20149410 www.national.com ...

Page 10

Application Hints This device is a dual low power op amp with internally trimmed input offset voltages and JFET input devices (BI-FET II). These JFETs have large reverse breakdown voltages from gate to source and drain eliminating the need for ...

Page 11

Typical Applications Runs from 9v batteries (±9V supplies) Fully settable gain and time constant Battery powered supply allows direct plug-in interface to strip chart recorder without common-mode problems Trim 1M pot for 1 kHz full-scale output 15 mW power drain ...

Page 12

T = 75°C control — A1's output represents the amplified difference between the LM335 temperature sensor and the crystal oven's temperature — A2, a free running duty cycle modulator, drives the LM395 to complete a servo loop — Switched ...

Page 13

Q1, Q2, Q3 are included on LM389 amplifier chip which is temperature-stabilized by the LM389 and Q2-Q3, which act as a heater-sensor pair. Q1, the logging transistor, is thus immune to ambient temperature variation and requires no temperature compensation at ...

Page 14

Revision History Date Released Revision 12/16/2010 A New release to corporate format www.national.com Section 1 MDS datasheet converted into one corporate datasheet format. MNLF442M-X Rev 0A1 will be archived. 14 Changes ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted 8 LD TO-99 Metal Can (H) NS Package Number H08C 15 www.national.com ...

Page 16

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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