175 k:

200:

0.01 PF

0.01 PF

100:

100:

0.01 PF

15

12

5

2

7

17

GND

20

10 k:

0.01 PF

0.01 PF

+9.0V to

+16.0V

+4.75V to

+5.50V

LM9044V

RICH

LEAN

800 mV -

450 mV -

100 mV -

LM9044

www.ti.com

SNOSBP4D – FEBRUARY 1995 – REVISED MARCH 2013

LM9044 Lambda Sensor Interface Amplifier

Check for Samples: LM9044

1

FEATURES

DESCRIPTION

The LM9044 is a precision differential amplifier

2

•

Normal Circuit Operation Specified with Inputs

specifically designed for operation in the automotive

up to 3V Below Ground on a Single Supply.

environment. Gain accuracy is specified over the

•

Gain Factory Trimmed and Specified over

entire

automotive

temperature

range

(

−40°C to

Temperature (±3% of Full-scale from

−40°C to

+125°C) and is factory trimmed after package

+125°C)

assembly. The input circuitry has been specifically

designed to reject common-mode signals as much as

•

Low Power Consumption (Typically 1 mA)

3V below ground without the need for a negative

•

Fully Protected Inputs

voltage supply. This facilitates the use of sensors

•

Input Open Circuit Detection

which are grounded at the engine block while the

LM9044 itself is grounded at chassis potential. An

•

Operation Specified over the Entire

Automotive Temperature Range (

−40°C to

operating frequency of the amplifier, thereby filtering

+125°C)

high frequency transients. Both inputs are protected

against accidental shorting to the battery and against

load dump transients. The input impedance is

typically 1.2 M

Ω.

The output op amp is capable of driving capacitive

loads and is fully protected. Also, internal circuitry has

been provided to detect open circuit conditions on

either or both inputs and force the output to a “home”

position (a ratio of the external reference voltage).

Typical Application

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 1995–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.