LM9040MX National Semiconductor, LM9040MX Datasheet

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LM9040MX

Manufacturer Part Number
LM9040MX
Description
IC AMP DUAL SENSR INTERFC 14SOIC
Manufacturer
National Semiconductor
Type
Sensor Interfacer
Datasheet

Specifications of LM9040MX

Input Type
Differential
Output Type
Voltage
Current - Supply
8mA
Mounting Type
Surface Mount
Package / Case
14-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Interface
-
Other names
*LM9040MX

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM9040MX/NOPB
Manufacturer:
KOSAN
Quantity:
6 241
© 2009 National Semiconductor Corporation
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 sensor
output voltage to a level suitable for A/D conversion in a sys-
tem using a 5V reference.
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.
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 com-
ponents.
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
12372 Version 3 Revision 2
12372
See NS Package Number M14B
Ordering Information
LM9040M
Top View
LM9040
Print Date/Time: 2009/12/02 10:13:43
Features
Applications
Single 5V supply operation
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
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
1237201
BB
generator
December 2, 2009
OBSOLETE
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LM9040MX Summary of contents

Page 1

... 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 © 2009 National Semiconductor Corporation 12372 Version 3 Revision 2 LM9040 Features ■ Single 5V supply operation ■ ...

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 2) ≤ Input Voltage Transient (Note ESD Susceptibility (Note 3) Maximum Junction Temperature Storage Temperature Range DC Electrical Characteristics ...

Page 3

Typical Performance Characteristics Supply Current vs Temperature F (Normalized CLOCK Z vs Temperature DIFF 12372 Version 3 Revision 2 F CLOCK 1237204 Output R vs Temperature CC 1237206 1237208 3 Print Date/Time: 2009/12/02 10:13:43 (Normalized OSC ...

Page 4

Voltage Gain vs Frequency CMRR vs Frequency www.national.com 1237210 1237212 4 12372 Version 3 Revision 2 Print Date/Time: 2009/12/02 10:13:43 PSRR vs Frequency 1237211 ...

Page 5

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 net- works (SCN). ...

Page 6

In effect, the result is the same as forcing a bias current through the Differential Input Impedance. The bias current is defined as: The Differential Input Impedance is defined as: This bias voltage will be developed across the Differential In- ...

Page 7

Gain and Filter Stage The signal gain and filter stage is designed to have a DC gain of 4.53 V/V, with a cut-off frequency of typically 500 Hz. The external 4 kΩ resistors on each input pin are in series ...

Page 8

Each amplifier has a comparator to monitor the voltage on the inverting input pin. When the voltage on an inverting ...

Page 9

FIGURE 11. Typical Application 9 12372 Version 3 Revision 2 Print Date/Time: 2009/12/02 10:13:43 1237221 www.national.com ...

Page 10

Physical Dimensions 14-Lead (0.300" Wide) Molded Small Outline Package, JEDEC www.national.com inches (millimeters) unless otherwise noted Order Number LM9040M NS Package Number M14B 10 12372 Version 3 Revision 2 Print Date/Time: 2009/12/02 10:13:43 ...

Page 11

Notes 11 12372 Version 3 Revision 2 Print Date/Time: 2009/12/02 10:13:43 www.national.com ...

Page 12

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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