LM9040M National Semiconductor, LM9040M Datasheet

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LM9040M

Manufacturer Part Number
LM9040M
Description
Dual Lambda Sensor Interface Amplifier
Manufacturer
National Semiconductor
Datasheets

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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
g
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
b
40 C to
a
125 C and is provided in a 14-pin
TL H 12372
See NS Package Number M14B
Ordering Information
LM9040M
Top View
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
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
BB
generator
RRD-B30M115 Printed in U S A
g
2V
August 1995

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LM9040M Summary of contents

Page 1

... Low power consumption (42 mW max) Y Gain set by design and guaranteed over the operating Y temperature range Applications Closed loop emissions control Y Catalytic converter monitoring Y Top View Ordering Information LM9040M See NS Package Number M14B August 1995 2V g generator 12372– 1 RRD-B30M115 Printed ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Continuous (Note 1) Input Voltage Transient (Note 1) s ESD Susceptibility (Note 2) Maximum Junction Temperature Storage Temperature Range ...

Page 3

Typical Performance Characteristics Supply Current vs Temperature TL H 12372– 4 Output R vs Temperature TL H 12372– 7 Voltage Gain vs Frequency TL H 12372–10 F (Normalized CLOCK OSC TL H 12372 – Temperature ...

Page 4

Circuit Description The LM9040 is fabricated in CMOS technology and is de- signed to operate from a single well regulated 5V supply The IC consists of two independent differential amplifiers which are designed using two-phased switched capacitor networks (SCN) The ...

Page 5

Differential Input Circuit (Continued) The differential input impedance is a function of the value of the input capacitor array and the sampling frequency The capacitor C is used to generate a bias voltage across BIAS the Differential Input impedance (Z ...

Page 6

Common Mode Filtering (Continued) For a common mode sine wave signal having a frequency 100 Hz and with 100 kHz the minimum com- CLOCK mon mode rejection would be CMRR 2 3 14159 100 5E ...

Page 7

Cold Sensor Typically a Lambda sensor will have an impedance of less than 10 k when operating at temperatures between 300 C and 500 C When a Lambda sensor is not at operating tem- perature its impedance can be more ...

Page 8

Open Input Pins Defaults (Continued) In the cases where both the inverting and non-inverting pins are open the non-inverting condition (i e voltage divider across the output) will be the dominant condition Any common mode signal seen by inverting input ...

Page 9

9 ...

Page 10

... Italiano National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Order Number LM9040M NS Package Number M14B 2 A critical component is any component of a life ...

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