LM94022EVAL National Semiconductor, LM94022EVAL Datasheet

LM94022EVAL

Manufacturer Part Number

LM94022EVAL

Description

BOARD EVALUATION LM94022

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LM94022EVAL.pdf (16 pages)

2.LM94022EVAL.pdf (10 pages)

Specifications of LM94022EVAL

Sensor Type

Temperature

Sensing Range

-50°C ~ 150°C

Interface

Analog

Sensitivity

±1.5°C

Voltage - Supply

1.5 V ~ 5.5 V

Embedded

Utilized Ic / Part

LM94022

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current page: 1 of 16
Download datasheet (990Kb)

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 V

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

■

Connection Diagram

Cell phones

Wireless Transceivers

Battery Management

Automotive

See NS Package Number MAA05A

Top View

SC70-5

20143001

201430

LM94022/LM94022Q

or Ground

■

Features

■

Key Specifications

Typical Transfer Characteristic

■

Accuracy

■

Temperature

Disk Drives

Games

Appliances

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

Supply Current

Output Drive

Supply Voltage

Temperature

Operating

Output Voltage vs Temperature

-50°C to 150°C

-50°C to 70°C

-50°C to 90°C

20°C to 40°C

−50°C to 150°C

March 17, 2009

20143024

1.5V to 5.5V

www.national.com

5.4 μA (typ)

±50 μA

±1.5°C

±1.8°C

±2.1°C

±2.7°C

Related parts for LM94022EVAL

LM94022EVAL Summary of contents

Page 1

... Cell phones ■ Wireless Transceivers ■ Battery Management ■ Automotive Connection Diagram SC70-5 Top View See NS Package Number MAA05A © 2009 National Semiconductor Corporation LM94022/LM94022Q ■ Disk Drives ■ Games ■ Appliances Features ■ LM94022Q is AEC-Q100 Grade 0 qualified and is manufactured on an Automotive Grade Flow. ...

Page 2

Typical Application Full-Range Celsius Temperature Sensor (−50°C to +150°C) Operating from a Single Battery Cell Ordering Information Order Temperature Number Accuracy LM94022BIMG ±1.5°C to ±2.7°C LM94022BIMGX ±1.5°C to ±2.7°C LM94022QBIMG ±1.5°C to ±2.7°C LM94022QBIMGX ±1.5°C to ±2.7°C www.national.com 20143002 NS ...

Page 3

Pin Descriptions Label Pin Type Numb er GS1 5 Logic Input GS0 1 Logic Input OUT 3 Analog Output V 4 Power DD GND 2 Ground Equivalent Circuit Gain Select 1 - One of two inputs for selecting the slope ...

Page 4

Absolute Maximum Ratings Supply Voltage Voltage at Output Pin Output Current Voltage at GS0 and GS1 Input Pins Input Current at any pin (Note 2) Storage Temperature Maximum Junction Temperature (T ) JMAX ESD Susceptibility (Note 3) : Human Body ...

Page 5

Electrical Characteristics Unless otherwise noted, these specifications apply for + all other limits 25°C. MAX A J Symbol Parameter Sensor Gain Load Regulation (Note 10) Line Regulation (Note 11) I Supply Current S C ...

Page 6

Typical Performance Characteristics Temperature Error vs. Temperature Supply Current vs. Temperature www.national.com Minimum Operating Temperature vs. Supply Voltage 20143007 Supply Current vs. Supply Voltage 20143004 6 20143006 20143005 ...

Page 7

Load Regulation, Sourcing Current Change in Vout vs. Overhead Voltage Load Regulation, Sinking Current 20143040 Supply-Noise Gain vs. Frequency 20143042 7 20143041 20143043 www.national.com ...

Page 8

Output Voltage vs. Supply Voltage Gain Select = 00 Output Voltage vs. Supply Voltage Gain Select = 10 www.national.com Output Voltage vs. Supply Voltage Gain Select = 01 20143034 Output Voltage vs. Supply Voltage Gain Select = 11 20143036 8 ...

Page 9

LM94022 Transfer Function The LM94022 has four selectable gains, each of which can be selected by the GS1 and GS0 input pins. The output volt- age for each gain, across the complete operating temperature range is shown in the ...

Page 10

Temperat ure (mV) (mV) (°C) 35 843 1283 36 838 1275 37 832 1267 38 827 1258 39 821 1250 40 816 1242 41 810 1234 42 804 1225 43 799 1217 44 793 ...

Page 11

Temperat ure (mV) (mV) (mV) (°C) 131 296 469 642 132 291 460 630 133 285 452 618 134 279 443 607 135 273 434 595 136 267 425 584 137 ...

Page 12

Mounting and Thermal Conductivity The LM94022 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be glued or ce- mented to a surface. To ensure good thermal conductivity, the backside of the LM94022 ...

Page 13

C. The larger gain is optimal for reducing the effects of noise (for example, noise coupling on the output line or quantization noise induced by an analog-to-digital converter ...

Page 14

Applications Circuits FIGURE 5. Conserving Power Dissipation with Shutdown Most CMOS ADCs found in microcontrollers and ASICs have a sampled data comparator input structure. When the ADC charges the sampling cap, it requires instantaneous charge from the output of ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM94022BIMG, LM94022BIMGX, LM94022QBIMG, LM94022QBIMGX 5-Lead SC70 Molded Package NS Package Number MAA05A 15 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: 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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