LM9040M National Semiconductor, LM9040M Datasheet

LM9040M

Manufacturer Part Number

LM9040M

Description

Dual Lambda Sensor Interface Amplifier

Manufacturer

National Semiconductor

Datasheets

1.LM9040M.pdf (10 pages)

2.LM9040M.pdf (10 pages)

3.LM9040M.pdf (10 pages)

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C 1995 National Semiconductor Corporation

LM9040

Dual Lambda Sensor Interface Amplifier

General Description

The LM9040 is a dual sensor interface circuit consisting of

two independent sampled input differential amplifiers de-

signed for use with conventional Lambda Oxygen Sensors

The Lambda Sensor is used for monitoring the oxygen con-

centration in the exhaust of gasoline engines using catalytic

after treatment and will deliver a voltage signal which is de-

pendent on the air-fuel mixture The gain of the amplifiers

are internally set and can directly convert the Lambda sen-

sor output voltage to a level suitable for A D conversion in a

system using a 5V reference

The input common mode voltage range of each amplifier is

to connect to sensors which are remotely grounded at the

engine exhaust manifold or exhaust pipe

Each amplifier is capable of independent default operation

should either or both of the leads to a sensor become

open circuited

Noise filtering is provided by an internal switched capacitor

low pass filter as part of each amplifier and by external

components

The LM9040 is fully specified over the automotive tempera-

ture range of

Small Outline surface mount package

Connection Diagram

2V with respect to the IC ground pin This will allow the IC

40 C to

125 C and is provided in a 14-pin

TL H 12372

See NS Package Number M14B

Ordering Information

LM9040M

Top View

Features

Applications

Single 5V supply operation

Common mode input voltage range of

Differential input voltage range of 50 mV to 950 mV

Sampled differential input

Switched capacitor low pass filter

Internal oscillator and V

Open input default operation

Cold sensor default operation

Low power consumption (42 mW max)

Gain set by design and guaranteed over the operating

temperature range

Closed loop emissions control

Catalytic converter monitoring

TL H 12372– 1

generator

RRD-B30M115 Printed in U S A

August 1995

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