a
FEATURES
200擄C Temperature Span
Accuracy Better than
鹵2%
of Full Scale
Linearity Better than
鹵1%
of Full Scale
Temperature Coefficient of 22.5 mV/擄C
Output Proportional to Temperature
脳
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
Voltage Output Temperature Sensor
with Signal Conditioning
AD22100*
SIMPLIFIED BLOCK DIAGRAM
V+
螜
V
OUT
R
T
+5V
The AD22100 is a monolithic temperature sensor with on-chip
signal conditioning. It can be operated over the temperature
range 鈥?0擄C to +150擄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 times the
supply voltage (ratiometric). The output swings from 0.25 V at
鈥?0擄C to +4.75 V at +150擄C using a single +5.0 V supply.
Due to its ratiometric nature, the AD22100 offers a cost effec-
tive solution when interfacing to an analog-to-digital converter.
This is accomplished by using the ADC鈥檚 +5 V power supply as
a reference to both the ADC and the AD22100 (See Figure 1),
eliminating the need for and cost of a precision reference.
*
Protected by U.S. Patent Nos. 5030849 and 5243319
.
AD22100
V
O
SIGNAL OUTPUT
DIRECT TO ADC
1k鈩?/div>
REFERENCE
ANALOG TO
DIGITAL
CONVERTER
INPUT
0.1碌F
鈥?0擄C TO +150擄C
Figure 1. Application Circuit
REV. B
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., 1994
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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