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AD22100AR-REEL
Voltage Output Temperature Sensor with Signal Conditioning
Voltage Output Temperature Sensor
with Signal Conditioning
Rev. D
FEATURES
200°C 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+
Single-supply operation
Reverse voltage protection
Minimal self-heating
High level, low impedance output
APPLICATIONS
HVAC systems
System temperature compensation
Board level temperature sensing
Electronic thermostats
MARKETS
Industrial process control
Instrumentation
Automotive
GENERAL DESCRIPTION The AD221001 is a monolithic temperature sensor with on-chip
signal conditioning. It can be operated over the temperature
range −50°C to +150°C, 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
−50°C to +4.75 V at +150°C 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 ADC’s +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). . Patent No. 5,030,849 and 5,243,319.
FUNCTIONAL BLOCK DIAGRAM
VOUT00673-C-001
Figure 1.
+5V00673-C-002
Figure 2. Application Circuit
TABLE OF CONTENTS Specifications.....................................................................................3
Chip Specifications.......................................................................3
Absolute Maximum Ratings............................................................4
ESD Caution..................................................................................4
Pin Configurations and Function Descriptions...........................5
Typical Performance Characteristics.............................................6
Theory of Operation........................................................................7
Absolute Accuracy and Nonlinearity Specifications...............7
Output Stage Considerations.......................................................7
Ratiometricity Considerations....................................................8
Mounting Considerations............................................................8
Thermal Environment Effects.....................................................8
Microprocessor A/D Interface Issues.........................................9
Use with a Precision Reference as the Supply Voltage................9
Outline Dimensions.......................................................................10
Ordering Guide..........................................................................11
REVISION HISTORY
7/04—Data Sheet Changed from Rev. C to Rev. D Change to AD22100K Specifications.............................................3
Updated Outline Dimensions.......................................................10
Changes to Ordering Guide..........................................................11
6/04—Data 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
12/94—Data Sheet Changed from Rev. A to Rev. B SPECIFICATIONS TA = 25°C and V+ = 4 V to 6.5 V, unless otherwise noted.
Table 1. FS (full scale) is defined as the operating temperature range −50°C to +150°C. The listed maximum specification limit applies to the guaranteed temperature range.
For example, the AD22100K has a nonlinearity of (0.5%) × (200°C) = 1°C over the guaranteed temperature range of 0°C to +100°C.
CHIP SPECIFICATIONS TA = 25°C and V+ = 5.0 V, unless otherwise noted.
Table 2.
ABSOLUTE MAXIMUM RATINGS
Table 3. Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 3
GND
BOTTOM VIEW
(Not to Scale)00673-C-003
Figure 3. 3-Lead TO-92
Table 4. 3-Lead TO-92 Pin Function Descriptions
GND
NC = NO CONNECT00673-C-004
Figure 4. 8-Lead SOIC
Table 5. 8-Lead SOIC Pin Function Descriptions TYPICAL PERFORMANCE CHARACTERISTICS
ec)Figure 5. Thermal Response vs. Flow Rate
12000
FLOW RATE (CFM)
(°C/W)
250Figure 6. Thermal Resistance vs. Flow Rate
