lm9044vx National Semiconductor Corporation, lm9044vx Datasheet

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lm9044vx

Manufacturer Part Number
lm9044vx
Description
Lambda Sensor Interface Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2001 National Semiconductor Corporation
LM9044
Lambda Sensor Interface Amplifier
General Description
The LM9044 is a precision differential amplifier specifically
designed for operation in the automotive environment. Gain
accuracy is guaranteed over the entire automotive tempera-
ture range (−40˚C to +125˚C) and is factory trimmed after
package assembly. The input circuitry has been specifically
designed to reject common-mode signals as much as 3V
below ground on a single positive power supply. This facili-
tates the use of sensors which are grounded at the engine
block while the LM9044 itself is grounded at chassis poten-
tial. An external capacitor sets the maximum operating fre-
quency of the amplifier, thereby filtering high frequency tran-
sients. Both inputs are protected against accidental shorting
to the battery and against load dump transients. The input
impedance is typically 1 M .
The output op amp is capable of driving capacitive loads and
is fully protected. Also, internal circuitry has been provided to
Schematic and Connection Diagrams
DS006744
detect open circuit conditions on either or both inputs and
force the output to a “home” position (a ratio of the external
reference voltage).
Features
n Normal circuit operation guaranteed with inputs up to 3V
n Gain factory trimmed and guaranteed over temperature
n Low power consumption (typically 1 mA)
n Fully protected inputs
n Input open circuit detection
n Operation guaranteed over the entire automotive
n Single supply operation
below ground on a single supply.
(
temperature range (−40˚C to +125˚C)
±
3% of full-scale from −40˚C to +125˚C)
00674401
November 2001
www.national.com

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lm9044vx Summary of contents

Page 1

... The output op amp is capable of driving capacitive loads and is fully protected. Also, internal circuitry has been provided to Schematic and Connection Diagrams © 2001 National Semiconductor Corporation detect open circuit conditions on either or both inputs and force the output to a “home” position (a ratio of the external reference voltage) ...

Page 2

Schematic and Connection Diagrams * Pins 10, 11, 13, 14, 16, 18, 19 are trim pins and should be left floating. www.national.com (Continued) Plastic Chip Carrier Package 00674406 Top View Order Number LM9044V See ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V Supply Voltage ( Supply Voltage REF DC Input Voltage (Either input) ...

Page 4

Typical Performance Characteristics Non-Inverting Input Bias Current vs Temperature V Supply Current vs REF Temperature Short Circuit Output Current vs Temperature www.national.com Current vs Temperature 00674402 V 00674408 00674410 4 Inverting Input Bias 00674407 Supply Current vs CC Temperature 00674409 ...

Page 5

Typical Performance Characteristics Voltage Gain vs Frequency V Power Supply REF Rejection Test Circuit (Continued) 00674411 V CC 00674413 00674405 5 CMRR vs Frequency 00674412 Power Supply Rejection 00674404 www.national.com ...

Page 6

Physical Dimensions 6 ...

Page 7

... 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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