LF442MH National Semiconductor, LF442MH Datasheet

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LF442MH

Manufacturer Part Number
LF442MH
Description
Dual Low Power JFET Input Operational Amplifier
Manufacturer
National Semiconductor
Datasheets

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© 1999 National Semiconductor Corporation
LF442
Dual Low Power JFET Input Operational Amplifier
General Description
The LF442 dual low power operational amplifiers provide
many of the same AC characteristics as the industry stan-
dard LM1458 while greatly improving the DC characteristics
of the LM1458. The amplifiers have the same bandwidth,
slew rate, and gain (10 k
draw 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 de-
sign and internal 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
immediate 10 times reduction in power drain in many appli-
cations. The LF442 should be used where low power dissi-
pation and good electrical characteristics are the major con-
siderations.
Typical Connection
Ordering Information
LF442XYZ
X indicates electrical grade
Y indicates temperature range
Z indicates package type
BI-FET II
“M” for military
“C” for commercial
“H” or “N”
is a trademark of National Semiconductor Corporation.
load) as the LM1458 and only
DS009155-1
DS009155
Features
n 1/10 supply current of a LM1458:
n Low input bias current: 50 pA (max)
n Low input offset voltage: 1 mV (max)
n Low input offset voltage drift: 10 µV/˚C (max)
n High gain bandwidth: 1 MHz
n High slew rate: 1 V/µs
n Low noise voltage for low power:
n Low input noise current:
n High input impedance: 10
n High gain V
Connection Diagrams
Pin 4 connected to case
Order Number LF442AMH or LF442MH
Order Number LF442ACN or LF442CN
See NS Package Number H08A
See NS Package Number N08E
O
=
Dual-In-Line Package
±
Metal Can Package
10V, R
or LF442MH/883
Top View
Top View
L
= 10k: 50k (min)
12
400 µA (max)
DS009155-2
DS009155-4
www.national.com
April 1999

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LF442MH Summary of contents

Page 1

... High gain V 10V Connection Diagrams Metal Can Package DS009155-2 Pin 4 connected to case Top View Order Number LF442AMH or LF442MH or LF442MH/883 See NS Package Number H08A Dual-In-Line Package Top View Order Number LF442ACN or LF442CN See NS Package Number N08E April 1999 DS009155-4 www.national.com ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LF442A ± Supply Voltage 22V ± Differential Input Voltage 38V ± Input Voltage Range 19V (Note 2) Output Short Circuit Continuous Duration (Note 3) ...

Page 3

... Note 9: Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice from ± ± ± ± 15V to 5V for the LF442 and 20V to 5V for the LF442A. Note 10: Refer to RETS442X for LF442MH military specifications. Typical Performance Characteristics Input Bias Current DS009155-17 Positive Common-Mode Input Voltage Limit DS009155-20 (Note 7) (Continued) T 70˚ ...

Page 4

Typical Performance Characteristics Negative Current Limit DS009155-23 Gain Bandwidth DS009155-26 Distortion vs Frequency DS009155-29 www.national.com (Continued) Output Voltage Swing DS009155-24 Bode Plot DS009155-27 Undistorted Output Voltage Swing DS009155-30 4 Output Voltage Swing DS009155-25 Slew Rate DS009155-28 Open Loop Frequency Response ...

Page 5

Typical Performance Characteristics Common-Mode Rejection Ratio DS009155-32 Open Loop Voltage Gain DS009155-35 Pulse Response = Small Signal Inverting (Continued) Power Supply Rejection Ratio DS009155-33 Output Impedance DS009155- Small Signal Non-Inverting ...

Page 6

Pulse Response = Large Signal Inverting 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 ...

Page 7

Typical Applications Battery Powered Strip Chart Preamplifier ± 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 ...

Page 8

Typical Applications (Continued) = 75˚C • T 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 ...

Page 9

Typical Applications (Continued) 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 ...

Page 10

Detailed Schematic Simplified Schematic www.national.com 1/2 Dual DS009155-16 1/2 Dual DS009155-3 10 ...

Page 11

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LF442AMH or LF442MH/883 TO-5 Metal Can Package (H) NS Package Number H08A 11 www.national.com ...

Page 12

... National Semiconductor Asia Pacific Customer Fax: +49 (0) 1 80-530 85 86 Response Group Email: europe.support@nsc.com Tel: 65-2544466 Fax: 65-2504466 Tel: +49 (0) 1 80-532 78 32 Email: sea.support@nsc.com Tel: +49 (0) 1 80-534 16 80 National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 ...

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