Datasheet > LM9040M

LM9040M

更新时间： 2024-11-22 22:31:11

品牌	Logo	应用领域
美国国家半导体 - NSC		传感器放大器
页数	文件大小	规格书
10页	180K
描述
Dual Lambda Sensor Interface Amplifier

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LM9040M 数据手册

August 1995

LM9040

Dual Lambda Sensor Interface Amplifier

General Description

Features

Single 5V supply operation

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.

Common mode input voltage range of 2V

Differential input voltage range of 50 mV to 950 mV

Sampled differential input

Switched capacitor low pass filter

Internal oscillator and V

generator

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

The input common mode voltage range of each amplifier is

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

to connect to sensors which are remotely grounded at the

engine exhaust manifold or exhaust pipe.

Applications

Closed loop emissions control

Each amplifier is capable of independent default operation

should either, or both, of the leads to a sensor become

open circuited.

Catalytic converter monitoring

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 40 C to 125 C and is provided in a 14-pin

Small Outline surface mount package.

Connection Diagram

TL/H/12372–1

Top View

Ordering Information

LM9040M

See NS Package Number M14B

1995 National Semiconductor Corporation

TL/H/12372

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...10

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