a
FEATURES
3.3 V, Single Supply Operation
Temperature Coefficient of 28 mV/擄C
100擄C Temperature Span (0擄C to +100擄C)
Accuracy Better Than 2.5% of Full Scale
Linearity Better Than 0.5% of Full Scale
Output Proportional to Temperature
脳
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
GENERAL DESCRIPTION
3.3 V Supply, Voltage Output Temperature
Sensor with Signal Conditioning
AD22103*
SIMPLIFIED BLOCK DIAGRAM
V
S
螜
V
OUT
R
T
+3.3V
The AD22103 is a monolithic temperature sensor with on-chip
signal conditioning. It can be operated over the temperature
range 0擄C to +100擄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擄C to +3.05 V at +100擄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鈥檚 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.
*
Protected by U.S. Patent Nos. 5030849 and 5243319
.
AD22103
V
O
SIGNAL OUTPUT
DIRECT TO ADC
1k鈩?/div>
REFERENCE
ANALOG TO
DIGITAL
CONVERTER
INPUT
0.1碌F
Figure 1. Application Circuit
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
漏 Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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