TMP17 Analog Devices, TMP17 Datasheet

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TMP17

Manufacturer Part Number
TMP17
Description
Low Cost, Current Output Temperature Transducer
Manufacturer
Analog Devices
Datasheet

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GENERAL DESCRIPTION
The TMP17 is a monolithic integrated circuit temperature trans-
ducer 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 allow the TMP17 to achieve absolute
accuracy levels and nonlinearity errors previously unattainable
at a comparable price.
The TMP17 can be employed in applications from –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 SOIC-8 surface-mount
package.
PRODUCT HIGHLIGHTS
1. A wide operating temperature range (–40 C to +105 C) and
2. The TMP17 is electrically rugged; supply irregularities and
3. Because the TMP17 is a temperature dependent current
*Protected by U.S. Patent No. 4,123,698
REV. A
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
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
highly linear output make the TMP17 an ideal substitute for
older, more limited sensor technologies (i.e., thermistors, RTDs,
diodes, thermocouples).
variations or reverse voltages up to 20 V will not damage
the device.
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
5. Laser wafer trimming and temperature testing ensures that
6. Initial system accuracy will not degrade significantly over time.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
than 0.5 C/V rejection of supply voltage drift and ripple.
TMP17 units are easily interchangeable.
The TMP17 has proven long term performance and repeat-
ability advantages inherent in integrated circuit design and
construction.
248
378
343
273
–45
FUNCTIONAL BLOCK DIAGRAM
Low Cost, Current Output
Temperature Transducer
Figure 1. Transfer Characteristic
–25
NC
NC
V+
V–
PACKAGE DIAGRAM
© 2003 Analog Devices, Inc. All rights reserved.
NC
NC
V+
V–
0
NC = NO CONNECT
1
2
3
4
TEMPERATURE – C
(Not to Scale)
SOIC-8
TOP VIEW
1 A/K
8
7
6
5
NC
NC
NC
NC
70
NC
NC
NC
NC
TMP17
www.analog.com
105
125
*

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TMP17 Summary of contents

Page 1

... IC’s thin-film resistors allow the TMP17 to achieve absolute accuracy levels and nonlinearity errors previously unattainable at a comparable price. The TMP17 can be employed in applications from – +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 ...

Page 2

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the TMP17 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. = 5.0 V, – ...

Page 3

... SOIC PACKAGE SOLDERED TO 0.5“ 0.3” Cu PCB 100 200 300 AIR VELOCITY – FPM TPC 3. Thermal Time Constant in Forced Air REV. A Typical Performance Characteristics–TMP17 500 450 MAX LIMIT 400 350 300 3 250 200 150 100 MIN LIMIT 50 75 ...

Page 4

... C and the error over temperature from – +105 C. These specifications correspond to the actual error the user would see if the current output of a TMP17 were converted to a voltage with a precision resistor. Note that the maximum error at room temperature or over an extended range, including the boiling point of water, can be read directly from the Specifications table ...

Page 5

... If greater accuracy is desired, initial calibration and scale factor errors can be removed by using the TMP17 in the circuit of Figure 5. 5k 97.6k + 8.66k REF43 OP196 7.87k + TMP17 – V– Figure 5. Two Temperature Trim Circuit With the transducer adjustment of R1 for output nulls the initial calibration error and shifts the output from ...

Page 6

... By using a differential input A/D converter and choosing the current to voltage conversion resistor correctly, any range of temperatures (up to the 145 C span the TMP17 is rated for) centered at any point can be measured using a minimal number of components. In this configuration, the system will resolve ...

Page 7

... R Multiple remote temperatures can be measured using several TMP17s with a CMOS multiplexer or a series logic gates because of the device’s current-mode output and supply-voltage compliance range. The on resistance of a FET switch or output impedance of a gate will not affect the accuracy, as long maintained across the transducer ...

Page 8

... TMP17 0.25 (0.0098) 0.10 (0.0040) COPLANARITY CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN Revision History Location 1/03—Data Sheet changed from REV REV. A. Deleted Obsolete TPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ...

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