AD22103 Datasheet, PDF (1/6 Pages) Analog Devices – 3.3 V Supply, Voltage Output Temperature Sensor with Signal Conditioning

a 3.3 V Supply, Voltage Output Temperature
Sensor with Signal Conditioning
AD22103*
FEATURES
3.3 V, Single Supply Operation
Temperature Coefficient of 28 mV/°C
100°C Temperature Span (0°C to +100°C)
Accuracy Better Than 2.5% of Full Scale
Linearity Better Than 0.5% of Full Scale
Output Proportional to Temperature × V_S
Minimal Self-Heating
High Level, Low Impedance Output
Reverse Supply Protected
APPLICATIONS
Microprocessor Thermal Management
Battery and Low Powered Systems
Power Supply Temperature Monitoring
System Temperature Compensation
Board Level Temperature Sensing
MARKETS
Computers
Portable Electronic Equipment
Industrial Process Control
Instrumentation
SIMPLIFIED BLOCK DIAGRAM
V_S
Ι
R_T
V_OUT
GENERAL DESCRIPTION
The AD22103 is a monolithic temperature sensor with on-chip
signal conditioning. It can be operated over the temperature
range 0°C to +100°C, making it ideal for use in numerous 3.3 V
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 times the
supply voltage (ratiometric). The output swings from 0.25 V at
0°C to +3.05 V at +100°C using a single +3.3 V supply.
Due to its ratiometric nature, the AD22103 offers a cost effec-
tive solution when interfacing to an analog-to-digital converter.
This is accomplished by using the ADC’s power supply as a ref-
erence to both the ADC and the AD22103 (See Figure 1),
eliminating the need for and cost of a precision reference.
+3.3V
AD22103
SIGNAL OUTPUT
V_O
DIRECT TO ADC
1kΩ
0.1µF
REFERENCE
ANALOG TO
DIGITAL
CONVERTER
INPUT
Figure 1. Application Circuit
*Protected by U.S. Patent Nos. 5030849 and 5243319 .
REV. 0
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© Analog Devices, Inc., 1995
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