175 k:200:
0.01 PF
0.01 PF
100:
100:
0.01 PF
15
12
5
2
7
17
GND
VOUT
VREF
VCC
+VIN
20
10 k:0.01 PF
-VIN 0.01 PF
+9.0V to
+16.0V +4.75V to
+5.50V
LM9044V
VS
RF
AV = 1 AV = 4.5
RDIFF
RICH
LEAN
800 mV -
450 mV -
100 mV -
LM9044
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SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
LM9044 Lambda Sensor Interface Amplifier
Check for Samples: LM9044
1FEATURES 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 external capacitor on the RFpin sets the maximum
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 MΩ.
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
1Please 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.
2All 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.
LM9044
SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
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Connection Diagram
*Pins 1, 3, 4, 6, 8, 9, 10, 11, 13, 14, 16, 18, 19 are trim pins and should be left floating.
Figure 1. Top View
PLCC Package
See Package Number FN0020A
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SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS(1)(2)
VCC Supply Voltage (RVCC = 15 kΩ) ±60V
VREF Supply Voltage −0.3V to +6V
DC Input Voltage (Either input)(3) −3V to +16V
Input Transients (4) ±60V
Power Dissipation see (5) 1350 mW
Output Short Circuit Duration Indefinite
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Soldering Information
PLCC Package
Vapor Phase (60 seconds) 215°C
Infrared (15 seconds) 220°C
See http://www.ti.com for other methods of soldering surface mount devices.
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) With a 100Ωseries resistor on each input pin.
(4) This test is performed with a 1000Ωsource impedance.
(5) For operation in ambient temperatures above 25°C the device must be derated based on a maximum junction temperature of 150°C and
a thermal resistance of 93°C/W junction to ambient.
ELECTRICAL CHARACTERISTICS
VCC = 12V, VREF = 5V, −40°C ≤TA≤125°C unless otherwise noted (1) (2)
Parameter Conditions Units
Min Typ Max Min Typ Max
VDIFF = 0.5, −1V ≤VCM ≤+1V 4.41 4.50 4.59 - - - V/V
Differential Voltage Gain VDIFF = 0.5, −3V ≤VCM ≤+1V - - - 4.36 4.50 4.64 V/V
0≤VDIFF ≤1V, −1V ≤VCM ≤+1V −2 0 2 - - - %/FS
Gain Error (3) 0≤VDIFF ≤1V, −3≤VCM ≤+1V - - - −3 0 3 %/FS
0≤VDIFF ≤1V, −1V ≤VCM ≤+1V 0.95 1.20 3.00 - - - MΩ
Differential Input Resistance 0≤VDIFF ≤1V, −3≤VCM ≤+1V - - - 0.70 1.20 4.00 MΩ
0≤VDIFF ≤1V, −1≤VCM ≤+1V - ±0.38 ±0.65 - - - µA
Non-Inverting Input Bias Current 0≤VDIFF ≤1V, −3≤VCM ≤+1V - - - - ±0.38 ±1.5 µA
0≤VDIFF ≤1V, −1≤VCM ≤+1V −25 −65 −100 - - - µA
Inverting Input Bias Current 0≤VDIFF ≤1V, −3≤VCM ≤+1V - - - - −45 −150 µA
VCC Supply Current VCC = 12V, RVCC = 15k - 300 500 - - - µA
VREF Supply Current 4.75V ≤VREF ≤5.5V - 0.5 1.0 - - - mA
Common-Mode Voltage Range (4) −1 - 1 −3 - 1 V
Input Referred
DC Common-Mode Rejection Ratio −1V ≤VCM ≤+1V, VDIFF = 0.5V 50 60 - - - - dB
One or Both Inputs Open
Open Circuit Output Voltage −1V ≤VCM ≤+1V 0.371 0.397 0.423 - - - xVREF
−3V ≤VCM ≤+1V - - - 0.365 0.397 0.439 xVREF
Short Circuit Output Current Output Grounded 1.0 2.7 5.0 - - - mA
(1) These parameters are specified and 100% production tested.
(2) These parameters will be specified but not 100% production tested.
(3) Gain error is given as a percent of full-scale. Full-scale is defined as 1V at the input and 4.5V at the output.
(4) The LM9044 has been designed to common-mode to −3V, but production testing is only performed at ±1V.
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ELECTRICAL CHARACTERISTICS (continued)
VCC = 12V, VREF = 5V, −40°C ≤TA≤125°C unless otherwise noted (1) (2)
Parameter Conditions Units
Min Typ Max Min Typ Max
VCC = 12V, RVCC = 15k
VCC Power Supply Rejection Ratio 50 65 - - - - dB
VDIFF = 0.5V
VREF = 5 VDC
VREF Power Supply Rejection Ratio 60 74 - - - - dB
VDIFF = 0.5V
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SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
TYPICAL PERFORMANCE CHARACTERISTICS
Non-Inverting Input Bias Current Inverting Input Bias Current
vs vs
Temperature Temperature
Figure 2. Figure 3.
VREF Supply Current vs VCC Supply Current vs
Temperature Temperature
Figure 4. Figure 5.
Short Circuit Output Current
vs Differential Gain vs
Temperature Temperature
Figure 6. Figure 7.
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Voltage Gain CMRR
vs vs
Frequency Frequency
Figure 8. Figure 9.
VREF Power Supply
Rejection VCC Power Supply Rejection
Figure 10. Figure 11.
6Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated
Product Folder Links: LM9044
65 PA380 nA
175 k:200:
15
5
2
7
17
GND
VOUT
VREF
VCC
+VIN
20
-VIN
LM9044V
RF
7.5V
AV=1
Open -VIN
Detector
1.5V
RDIFF
1.2 M:
14 k:
4 k:
26.5 k:
12
220 k:
AV=4.5
LM9044
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SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
TEST CIRCUIT
Block Diagram
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www.ti.com
APPLICATION INFORMATION
CIRCUIT DESCRIPTION
The LM9044 is a single channel device intended to act as a linear interface between a zirconium dioxide oxygen
sensor and an A-to-D convertor. The LM9044 is fabricated in Bipolar technology and requires two supplies: a
nominal 12V automotive supply (i.e. VBATTERY), and a well regulated 5V supply.
The IC consists of a single channel differential input amplifier with a nominal DC gain of 4.5 V/V. The differential
inputs have a specified common mode voltage operating range of 1V above and below ground. The circuitry also
contains provisions for default output voltage in the cases of cold sensor and open sensor wiring. Additional
support circuitry includes one pin for an optional user programmed low pass filter.
COLD SENSOR
Typically, a Lambda sensor will have an impedance of less than 10 kΩwhen operating at temperatures between
300°C, and 500°C. When a Lambda sensor is not at operating temperature, its impedance can be more than 10
MegΩ. Any voltage signal that may be developed is seriously attenuated. During this high impedance condition
the LM9044 will provide a default output voltage.
While the Lambda sensor is high impedance the internal non-inverting input bias current (380 nA typical) will flow
through the differential input resistance (1.2 MΩtypical) and out the inverting input pin to ground. This will cause
a voltage to be developed across the differential inputs:
VIN(DIFF) = 380 nA x 1.2 MΩ
VIN(DIFF) = 456 mV
The 456 mV across differential input resistance will be the dominant input signal, and the typical VOUT will be:
VOUT = VIN(DIFF) x 4.50
VOUT = 456 mV x 4.50
VOUT = 2.0V
As the Lambda sensor is heated, and the sensor impedance begins to drop, the voltage signal from the sensor
will become the dominate signal.
The non-inverting input bias current is scaled to the VREF voltage. As the VREF voltage increases, or decreases,
this bias current will change proportionally.
OPEN INPUT PINS DEFAULTS
In any remote sensor application it is desirable to be able to deal with the possibility of open connections
between the sensor and the control module. The LM9044 is capable of providing a default output voltage should
either, or both, of the wires to the Lambda sensor open. The two inputs handle the open circuit condition
differently.
For the case of an open connection at the non-inverting input, the device would react exactly the same as for the
Cold Sensor condition. The internal non-inverting input bias current (380 nA typical) flowing through the
differential input resistance (1.2 MΩtypical) would cause the typical output voltage to be at a value defined by:
VOUT = ((380 nA x 1.2MΩ) x 4.50 )
VOUT = 2.0V
The inverting input would still be connected to the Lambda sensor ground, so common mode signals would still
need to be considered in this condition.
For the case of an open connection of the inverting input, the device output stage switches from the amplifier
output to a resistive voltage divider. The LM9044 has a comparator to monitor the voltage on the inverting input
pin, and a 65 μA (typical) current source that will force the pin high if the pin is open. When the voltage on the
inverting pin goes above typically 1.5V, the comparator will switch the output pin from the amplifier output to the
resistive voltage divider stage. In this case, the default VOUT is not dependent on the gain stage, and any signal
on the non-inverting input will be ignored.
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SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
In this condition VOUT is:
VOUT = VREF x ((14k + 4k) / (26.5k + 14k + 4k))
VOUT = VREF x 0.4045
When VREF is at 5.0V, VOUT is defined as:
VOUT = 5.0V x 0.4045
VOUT = 2.0V
In the cases where both the inverting and non-inverting pins are open, the open inverting pin condition (i.e.: a
voltage divider across the output) will be the dominant condition.
Any common mode voltage transient on the inverting input pin which goes above the comparator threshold will
immediately cause the output to switch to the resistive voltage divider mode. The output will return to normal
operation when the voltage on the inverting input falls below the 1.5V threshold.
OUTPUT RESISTANCE
Under normal operating conditions the output pin resistance is typically 200Ω.
If the LM9044 is operating in a default output mode due an open connection on the inverting input, the output
resistance will typically appear to be close to 11 kΩ.
An external output filter capacitor value of no more than 0.01 μF is generally recommended. Since the output pin
voltage drive is basically a simple NPN emitter follower, the output pin pull-down is done by the internal feedback
resistor string. With larger value capacitors on the output pin the effect will be somewhat similar to a voltage peak
detector where the output capacitor is charged through the 200Ωresistor, and discharged back through the 200Ω
resistor and the 18 kΩfeedback resistor string to ground.
The output resistance provides current limiting for the output stage should it become shorted to Ground. Any DC
loading of the output will cause an error in the output voltage.
SUPPLY BYPASSING
For best performance the LM9044 requires a VREF supply which is stable and noise free. The same 5V reference
supply used for the A/D converter is the recommended LM9044 VREF supply.
The LM9044 VCC pin has an internal zener shunt voltage regulator, typically 7.5V, and requires a series resistor
to limit the current. The VCC pin should be bypassed with a minimum 0.01 μF capacitor to the Ground pin, and
should be located as close to the device as possible. Some applications may require an additional bypass
capacitance if the system voltage is unusually noisy.
SETTING THE BANDWIDTH
The LM9044 bandwidth is limited by an external capacitor (CF) on the RFpin.
This pin has an internal 175 kΩresistor. The external capacitor and the internal resistor form a simple RC low-
pass filter with a corner frequency (fC) defined as:
fC= 1/ (2 x πx 175 kΩx CF)
With a CFcapacitor value of 0.001 μF, the corner frequency is:
fC= 1/ (2 x πx 175 kΩx 0.001 μF)
fC= 909 Hz
INPUT FILTERING
Filtering at the differential inputs is strongly recommended. Both the differential voltage signal and the common
mode voltage signal should have low pass filters.
Input filtering is accomplished with series resistors on the input pins, and appropriate bypass capacitors. Typical
input pin series resistance values are in the 100Ωto 1kΩrange. Series resistance values larger than 1kΩwill
generate offset voltages that affect the accuracy of the signal voltage seen at the differential input pins.
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SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
REVISION HISTORY
Changes from Revision C (March 2013) to Revision D Page
• Changed layout of National Data Sheet to TI format .......................................................................................................... 10
Copyright © 1995–2013, Texas Instruments Incorporated Submit Documentation Feedback 11
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PACKAGE OPTION ADDENDUM
www.ti.com 7-Oct-2013
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM9044V/NOPB ACTIVE PLCC FN 20 40 Green (RoHS
& no Sb/Br) CU SN Level-2A-250C-4
WEEK -40 to 125 LM9044V
LM9044VX/NOPB ACTIVE PLCC FN 20 1000 Green (RoHS
& no Sb/Br) CU SN Level-2A-250C-4
WEEK -40 to 125 LM9044V
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
MECHANICAL DATA
MPLC004A – OCTOBER 1994
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FN (S-PQCC-J**) PLASTIC J-LEADED CHIP CARRIER
4040005/B 03/95
20 PIN SHOWN
0.026 (0,66)
0.032 (0,81)
D2/E2
0.020 (0,51) MIN
0.180 (4,57) MAX
0.120 (3,05)
0.090 (2,29)
D2/E2
0.013 (0,33)
0.021 (0,53)
Seating Plane
MAX
D2/E2
0.219 (5,56)
0.169 (4,29)
0.319 (8,10)
0.469 (11,91)
0.569 (14,45)
0.369 (9,37)
MAX
0.356 (9,04)
0.456 (11,58)
0.656 (16,66)
0.008 (0,20) NOM
1.158 (29,41)
0.958 (24,33)
0.756 (19,20)
0.191 (4,85)
0.141 (3,58)
MIN
0.441 (11,20)
0.541 (13,74)
0.291 (7,39)
0.341 (8,66)
18
19
14
13
D
D1
13
9
E1E
4
8
MINMAXMIN
PINS
**
20
28
44
0.385 (9,78)
0.485 (12,32)
0.685 (17,40)
52
68
84 1.185 (30,10)
0.985 (25,02)
0.785 (19,94)
D/E
0.395 (10,03)
0.495 (12,57)
1.195 (30,35)
0.995 (25,27)
0.695 (17,65)
0.795 (20,19)
NO. OF D1/E1
0.350 (8,89)
0.450 (11,43)
1.150 (29,21)
0.950 (24,13)
0.650 (16,51)
0.750 (19,05)
0.004 (0,10)
M
0.007 (0,18)
0.050 (1,27)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-018
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