lf444cmx National Semiconductor Corporation, lf444cmx Datasheet

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lf444cmx

Manufacturer Part Number
lf444cmx
Description
Quad Low Power Jfet Input Operational Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet

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LF444CMX
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© 2004 National Semiconductor Corporation
LF444
Quad Low Power JFET Input Operational Amplifier
General Description
The LF444 quad low power operational amplifier provides
many of the same AC characteristics as the industry stan-
dard LM148 while greatly improving the DC characteristics
of the LM148. The amplifier has the same bandwidth, slew
rate, and gain (10 kΩ load) as the LM148 and only draws
one fourth the supply current of the LM148. In addition the
well matched high voltage JFET input devices of the LF444
reduce the input bias and offset currents by a factor of
10,000 over the LM148. The LF444 also has a very low
equivalent input noise voltage for a low power amplifier.
The LF444 is pin compatible with the LM148 allowing an
immediate 4 times reduction in power drain in many appli-
cations. The LF444 should be used wherever low power
dissipation and good electrical characteristics are the major
considerations.
Simplified Schematic
Ordering Information
LF444XYZ
X indicates electrical grade
Y indicates temperature range
BI-FET
“M” for military, “C” for commercial
and BI-FET II
are trademarks of National Semiconductor Corporation.
1/4 Quad
DS009156
00915601
Features
n
n Low input bias current: 50 pA (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: 50k (min)
Z indicates package type “D”, “M” or “N”
Connection Diagram
1
4
See NS Package Number D14E, M14A or N14A
supply current of a LM148:
LF444ACN, LF 444CN or LF444MD/883
Order Number LF444CM, LF444CMX,
Dual-In-Line Package
Top View
12
200 µA/Amplifier (max)
www.national.com
August 2000
00915602

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lf444cmx Summary of contents

Page 1

... Low input noise current n High input impedance High gain: 50k (min) Z indicates package type “D”, “M” or “N” Connection Diagram 00915601 Order Number LF444CM, LF444CMX, LF444ACN, LF 444CN or LF444MD/883 See NS Package Number D14E, M14A or N14A DS009156 August 2000 200 µA/Amplifier (max) Ω ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LF444A Supply Voltage Differential Input Voltage Input Voltage Range (Note 1) Output Short Circuit Continuous Duration (Note 2) D ...

Page 3

AC Electrical Characteristics Symbol Parameter Amplifier-to-Amplifier Coupling SR Slew Rate GBW Gain-Bandwidth Product e Equivalent Input Noise Voltage n i Equivalent Input Noise Current n Note 1: Unless otherwise specified the absolute maximum negative input voltage is equal to the ...

Page 4

Typical Performance Characteristics Supply Current Negative Common-Mode Input Voltage Limit Negative Current Limit www.national.com (Continued) Positive Common-Mode 00915614 Positive Current Limit 00915616 Output Voltage Swing 00915618 4 Input Voltage Limit 00915615 00915617 00915619 ...

Page 5

Typical Performance Characteristics Output Voltage Swing Bode Plot Distortion vs Frequency (Continued) 00915620 00915622 00915624 5 Gain Bandwidth 00915621 Slew Rate 00915623 Undistorted Output Voltage Swing 00915625 www.national.com ...

Page 6

Typical Performance Characteristics Open Loop Frequency Response Power Supply Rejection Ratio Open Loop Voltage Gain www.national.com (Continued) 00915626 00915628 Output Impedance 00915630 6 Common-Mode Rejection Ratio 00915627 Equivalent Input Noise Voltage 00915629 00915631 ...

Page 7

Typical Performance Characteristics Inverter Settling Time Pulse Response kΩ Small Signal Inverting Small Signal Non-Inverting (Continued) 00915632 = 00915606 Large Signal Non-Inverting 00915607 Application Hints This device is a quad low power ...

Page 8

Application Hints (Continued) 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 ...

Page 9

Typical Application pH Probe Amplifier/Temperature Compensator ± ***For R2 = 50k 330k 1% ± For R2 = 100k 75k 1% ± For R2 = 200k 56k 1% **Polystyrene *Film resistor type RN60C To calibrate, ...

Page 10

Detailed Schematic www.national.com 1/4 Quad 10 00915611 ...

Page 11

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LF444MD/883 See NS Package Number D14E Order Number LF444CM or LF444CMX See NS Package Number M14A 11 www.national.com ...

Page 12

... 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 ...

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