Voltage Output Temperature Sensor with Signal Conditioning AD22100 FUNCTIONAL BLOCK DIAGRAM FEATURES V+ 200C temperature span Accuracy better than 2% of full scale Linearity better than 1% of full scale Temperature coefficient of 22.5 mV/C Output proportional to temperature V+ V OUT Single-supply operation R T Reverse voltage protection Minimal self-heating High level, low impedance output Figure 1. APPLICATIONS HVAC systems +5V System temperature compensation REFERENCE Board level temperature sensing Electronic thermostats ANALOG-TO- DIGITAL CONVERTER MARKETS SIGNAL OUTPUT AD22100 DIRECT TO ADC V O Industrial process control INPUT 1k 0.1F Instrumentation Automotive 50C TO +150 C GENERAL DESCRIPTION The AD22100 is a monolithic temperature sensor with on-chip Figure 2. Application Circuit signal conditioning. It can be operated over the temperature range 50C to +150C, making it ideal for use in numerous HVAC, instrumentation, and automotive applications. The signal conditioning eliminates the need for any trimming, buffering, or linearization circuitry, greatly simplifying the system design and reducing the overall system cost. The output voltage is proportional to the temperature x the supply voltage (ratiometric). The output swings from 0.25 V at 50C to +4.75 V at +150C using a single +5.0 V supply. Due to its ratiometric nature, the AD22100 offers a cost- effective solution when interfacing to an analog-to-digital converter. This is accomplished by using the ADCs +5 V power supply as a reference to both the ADC and the AD22100 eliminating the need for and cost of a precision reference (see Figure 2). Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.326.8703 2004 Analog Devices, Inc. All rights reserved. 00673-C-001 00673-C-002AD22100 TABLE OF CONTENTS Specifications..................................................................................... 3 Output Stage Considerations.......................................................7 Chip Specifications....................................................................... 3 Ratiometricity Considerations ....................................................8 Absolute Maximum Ratings............................................................ 4 Mounting Considerations ............................................................8 ESD Caution.................................................................................. 4 Thermal Environment Effects .....................................................8 Pin Configurations and Function Descriptions ........................... 5 Microprocessor A/D Interface Issues .........................................9 Typical Performance Characteristics ............................................. 6 Use with a Precision Reference as the Supply Voltage................9 Theory of Operation ........................................................................ 7 Outline Dimensions ....................................................................... 10 Absolute Accuracy and Nonlinearity Specifications ............... 7 Ordering Guide .......................................................................... 11 REVISION HISTORY 7/04Data Sheet Changed from Rev. C to Rev. D Change to AD22100K Specifications............................................. 3 Updated Outline Dimensions ....................................................... 10 Changes to Ordering Guide .......................................................... 11 6/04Data Sheet Changed from Rev. B to Rev. C Changes to Format .............................................................Universal Changes to Specifications................................................................ 3 Changes to Chip Specifications ...................................................... 3 Changes to Ratiometricity Considerations Section ..................... 8 Changes to Ordering Guide .......................................................... 10 Updated Outline Dimensions ....................................................... 10 12/94Data Sheet Changed from Rev. A to Rev. B Rev. D Page 2 of 12