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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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

dependent 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.

Connection Diagram

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

DS012372

See NS Package Number M14B

Ordering Information

Top View

LM9040M

The LM9040 is fully specified over the automotive tempera-

ture range of −40˚C to +125˚C and is provided in a 14-pin

Small Outline surface mount package.

Features

n Single 5V supply operation

n Common mode input voltage range of

n Differential input voltage range of 50 mV to 950 mV

n Sampled differential input

n Switched capacitor low pass filter

n Internal oscillator and V

n Open input default operation

n Cold sensor default operation

n Low power consumption (42 mW max)

n Gain set by design and guaranteed over the operating

Applications

n Closed loop emissions control

n Catalytic converter monitoring

temperature range

01237201

generator

November 2001

www.national.com

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