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.

a

AD22103*

3.3 V Supply, Voltage Output Temperature

Sensor with Signal Conditioning

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

Ι

© 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

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.

AD22103

+3.3V

REFERENCE

ANALOG TO

DIGITAL

CONVERTER

INPUT

1k

Ω

SIGNAL OUTPUT

DIRECT TO ADC

0.1µF

Figure 1. Application Circuit