FUNCTIONAL DIAGRAM

NC

V

V

NC

NC

NC

NC

NC

PACKAGE DIAGRAM

SO-8

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

NC = NO CONNECT

NC

NC

NC

NC

NC

V

V

NC

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

Low Cost, Current Output

Temperature Transducer

TMP17*

FEATURES

Operating Temperature Range:

40 C to

105 C

Single Supply Operation:

4 V to

30 V

Excellent Repeatability and Stability

High Level Output: 1

A/K

Monolithic IC: Temperature In/Current Out

Minimal Self-Heating Errors

APPLICATIONS

Appliance Temperature Sensor

Automotive Temperature Measurement and Control

HVAC System Monitoring

Industrial Temperature Control

Thermocouple Cold Junction Compensation

GENERAL DESCRIPTION

The TMP17 is a monolithic integrated circuit temperature

transducer that provides an output current proportional to

absolute temperature. For a wide range of supply voltages the

transducer acts as a high impedance temperature dependent

current source of 1

µA/K. Improved design and laser wafer

trimming of the IC’s thin-film resistors allows the TMP17 to

achieve absolute accuracy levels and nonlinearity errors

previously unattainable at a comparable price.

The TMP17 can be employed in applications between

40

°C

to

105

°C where conventional temperature sensors (i.e.,

thermistor, RTD, thermocouple, diode) are currently being

used. Expensive linearization circuitry, precision voltage

references, bridge components, resistance measuring circuitry

and cold junction compensation are not required with the

TMP17.

The TMP17 is available in a low cost SO-8 surface-mount

package.

PRODUCT HIGHLIGHTS

1. A wide operating temperature range ( 40

°C to 105°C)

and highly linear output make the TMP17 an ideal substi-

tute for older, more limited sensor technologies (i.e., therm-

istors, RTDs, diodes, thermocouples).

2. The TMP17 is electrically rugged; supply irregularities and

variations or reverse voltages up to 20 V will not damage

the device.

3. Because the TMP17 is a temperature dependent current

source, it is immune to voltage noise pickup and IR drops in

the signal leads when used remotely.

4. The high output impedance of the TMP17 provides greater

than 0.5

°C/V rejection of supply voltage drift and ripple.

5. Laser wafer trimming and temperature testing insures that

TMP17 units are easily interchangeable.

6. Initial system accuracy will not degrade significantly over

time. The TMP17 has proven long term performance and

repeatability advantages inherent in integrated circuit design

and construction.

© Analog Devices, Inc., 1996

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

378

343

273

248

1µA/K

45

25

0

70

105

125

TEMPERATURE – C

Figure 1. Transfer Characteristic