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LM9040M Datasheet

  • LM9040M

  • Dual Lambda Sensor Interface Amplifier

  • 10頁

  • NSC

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LM9040 Dual Lambda Sensor Interface Amplifier
August 1995
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
g
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
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
b
40 C to
a
125 C and is provided in a 14-pin
Small Outline surface mount package
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Single 5V supply operation
Common mode input voltage range of
g
2V
Differential input voltage range of 50 mV to 950 mV
Sampled differential input
Switched capacitor low pass filter
Internal oscillator and V
BB
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
Applications
Y
Y
Closed loop emissions control
Catalytic converter monitoring
Connection Diagram
TL H 12372 鈥?1
Top View
Ordering Information
LM9040M
See NS Package Number M14B
C
1995 National Semiconductor Corporation
TL H 12372
RRD-B30M115 Printed in U S A

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