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PDF LM94022Q Data sheet ( Hoja de datos )
| Número de pieza | LM94022Q | |
| Descripción | 1.5V - SC70 / Multi-Gain Analog Temperature Sensor with Class-AB Output | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 6, 2007
www.DataSheet4U.com
LM94022/LM94022Q
1.5V, SC70, Multi-Gain Analog Temperature Sensor with
Class-AB Output
General Description
The LM94022 is a precision analog output CMOS integrated-
circuit temperature sensor that operates at a supply voltage
as low as 1.5 Volts. A class-AB output structure gives the
LM94022 strong output source and sink current capability for
driving heavy loads. For example, it is well suited to source
the input of a sample-and-hold analog-to-digital converter
with its transient load requirements. While operating over the
wide temperature range of −50°C to +150°C, the LM94022
delivers an output voltage that is inversely porportional to
measured temperature. The LM94022's low supply current
makes it ideal for battery-powered systems as well as general
temperature sensing applications.
Two logic inputs, Gain Select 1 (GS1) and Gain Select 0
(GS0), select the gain of the temperature-to-voltage output
transfer function. Four slopes are selectable: −5.5 mV/°C,
−8.2 mV/°C, −10.9 mV/°C, and −13.6 mV/°C. In the lowest
gain configuration (GS1 and GS0 both tied low), the LM94022
can operate with a 1.5V supply while measuring temperature
over the full −50°C to +150°C operating range. Tying both
inputs high causes the transfer function to have the largest
gain of −13.6 mV/°C for maximum temperature sensitivity.
The gain-select inputs can be tied directly to VDD or Ground
without any pull-up or pull-down resistors, reducing compo-
nent count and board area. These inputs can also be driven
by logic signals allowing the system to optimize the gain dur-
ing operation or system diagnostics.
Applications
■ Cell phones
■ Wireless Transceivers
■ Battery Management
■ Automotive
■ Disk Drives
■ Games
■ Appliances
Features
■ LM94022Q is AEC-Q100 Grade 0 qualified and is
manufactured on an Automotive Grade Flow.
■ Low 1.5V operation
■ Push-pull output with 50µA source current capability
■ Four selectable gains
■ Very accurate over wide temperature range of −50°C to
+150°C
■ Low quiescent current
■ Output is short-circuit protected
■ Extremely small SC70 package
■ Footprint compatible with the industry-standard LM20
temperature sensor
Key Specifications
■ Supply Voltage
■ Supply Current
■ Output Drive
■ Temperature
Accuracy
■ Operating
Temperature
20°C to 40°C
-50°C to 70°C
-50°C to 90°C
-50°C to 150°C
1.5V to 5.5V
5.4 μA (typ)
±50 μA
±1.5°C
±1.8°C
±2.1°C
±2.7°C
−50°C to 150°C
Connection Diagram
Typical Transfer Characteristic
SC70-5
Output Voltage vs Temperature
20143001
Top View
See NS Package Number MAA05A
© 2007 National Semiconductor Corporation 201430
20143024
www.national.com
1 page  
Electrical Characteristics
www.DataSheet4U.com
Unless otherwise noted, these specifications apply for +VDD = +1.5V to +5.5V. Boldface limits apply for TA = TJ = TMIN to
TMAX ; all other limits TA = TJ = 25°C.
Symbol
Parameter
Conditions
Typical
(Note 6)
Limits (Note 7)
Units
(Limit)
Sensor Gain
GS1 = 0, GS0 = 0
-5.5
mV/°C
GS1 = 0, GS1 = 1
-8.2
mV/°C
GS1 = 1, GS0 = 0
-10.9
mV/°C
GS1 = 1, GS0 = 1
-13.6
mV/°C
Load Regulation
(Note 10)
Line Regulation
(Note 13)
Source ≤ 50 μA,
(VDD - VOUT) ≥ 200mV
Sink ≤ 50 μA,
VOUT ≥ 200mV
-0.22
0.26
200
-1 mV (max)
1 mV (max)
μV/V
IS Supply Current
TA = +30°C to +150°C,
(VDD - VOUT) ≥ 100mV
TA = -50°C to +150°C,
(VDD - VOUT) ≥ 100mV
CL Output Load Capacitance
Power-on Time
(Note 11)
CL= 0 pF
CL=1100 pF
VIH GS1 and GS0 Input Logic
"1" Threshold Voltage
5.4
5.4
1100
0.7
0.8
8.1
9
5
10
VDD- 0.5V
μA (max)
μA (max)
pF (max)
ms (max)
ms (max)
V (min)
VIL GS1 and GS0 Input Logic
"0" Threshold Voltage
0.5 V (max)
IIH Logic "1" Input Current
(Note 12)
0.001
1 μA (max)
IIL Logic "0" Input Current
(Note 12)
0.001
1 μA (max)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: When the input voltage (VI) at any pin exceeds power supplies (VI < GND or VI > V+), the current at that pin should be limited to 5 mA.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged
directly into each pin.
Note 4: Reflow temperature profiles are different for lead-free and non-lead-free packages.
Note 5: The junction to ambient thermal resistance (θJA) is specified without a heat sink in still air.
Note 6: Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 8: Accuracy is defined as the error between the measured and reference output voltages, tabulated in the Transfer Table at the specified conditions of
supply gain setting, voltage, and temperature (expressed in °C). Accuracy limits include line regulation within the specified conditions. Accuracy limits do not
include load regulation; they assume no DC load.
Note 9: Changes in output due to self heating can be computed by multiplying the internal dissipation by the thermal resistance.
Note 10: Source currents are flowing out of the LM94022. Sink currents are flowing into the LM94022.
Note 11: Guaranteed by design.
Note 12: The input current is leakage only and is highest at high temperature. It is typically only 0.001µA. The 1µA limit is solely based on a testing limitation and
does not reflect the actual performance of the part.
Note 13: Line regulation (DC) is calculated by subtracting the output voltage at the highest supply voltage from the output voltage at the lowest supply voltage.
The typical DC line regulation specification does not include the output voltage shift discussed in Section 5.0.
5 www.national.com
5 Page 
Temperat GS = 00
ure (mV)
(°C)
131 296
132 291
133 285
134 279
135 273
136 267
137 261
138 255
139 249
140 243
141 237
142 231
143 225
144 219
145 213
146 207
147 201
148 195
149 189
150 183
GS = 01
(mV)
469
460
452
443
434
425
416
408
399
390
381
372
363
354
346
337
328
319
310
301
GS = 10
(mV)
642
630
618
607
595
584
572
560
549
537
525
514
502
490
479
467
455
443
432
420
GS = 11
(mV)
814
800
786
771
757
742
728
713
699
684
670
655
640
626
611
597
582
568
553
538
Although the LM94022 is very linear, its response does have
a slight downward parabolic shape. This shape is very accu-
rately reflected in the LM94022 Transfer Table. For a linear
approximation, a line can easily be calcwuwlawte.dDaotvaeSrhtehet4dUe-.com
sired temperature range from the Table using the two-point
equation:
Where V is in mV, T is in °C, T1 and V1 are the coordinates of
the lowest temperature, T2 and V2 are the coordinates of the
highest temperature.
For example, if we want to determine the equation of a line
with the Gain Setting at GS1 = 0 and GS0 = 0, over a tem-
perature range of 20°C to 50°C, we would proceed as follows:
Using this method of linear approximation, the transfer func-
tion can be approximated for one or more temperature ranges
of interest.
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LM94022Q.PDF ] | |
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