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.

a

AD22100*

Voltage Output Temperature Sensor

with Signal Conditioning

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 AD22100 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 times 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 effec-

tive 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 (See Figure 1),

eliminating the need for and cost of a precision reference.

SIMPLIFIED BLOCK DIAGRAM

V+

Ι

AD22100

+5V

REFERENCE

ANALOG TO

DIGITAL

CONVERTER

INPUT

1k

Ω

SIGNAL OUTPUT

DIRECT TO ADC

0.1µF

–50

°C TO +150°C

Figure 1. Application Circuit

© Analog Devices, Inc., 1994

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