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AD590
2-Wire, Current Output
Temperature Transducer
January 2002
Features
鈥?Linear Current Output . . . . . . . . . . . . . . . . . . . . 1碌A(chǔ)/
o
K
鈥?Wide Temperature Range . . . . . . . . . . . -55
o
C to 150
o
C
鈥?Two-Terminal Device Voltage In/Current Out
鈥?Wide Power Supply Range . . . . . . . . . . . . . +4V to +30V
鈥?Sensor Isolation From Case
鈥?Low Cost
Description
The AD590 is an integrated-circuit temperature transducer
which produces an output current proportional to absolute tem-
perature. The device acts as a high impedance constant cur-
rent regulator, passing 1碌A(chǔ)/
o
K for supply voltages between
+4V and +30V. Laser trimming of the chip's thin film resistors is
used to calibrate the device to 298.2碌A(chǔ) output at 298.2
o
K
(25
o
C).
The AD590 should be used in any temperature-sensing
application between -55
o
C to 150
o
C in which conventional
electrical temperature sensors are currently employed. The
inherent low cost of a monolithic integrated circuit combined
with the elimination of support circuitry makes the AD590 an
attractive alternative for many temperature measurement sit-
uations. Linearization circuitry, precision voltage amplifiers,
resistance measuring circuitry and cold junction compensa-
tion are not needed in applying the AD590. In the simplest
application, a resistor, a power source and any voltmeter
can be used to measure temperature.
In addition to temperature measurement, applications include
temperature compensation or correction of discrete
components, and biasing proportional to absolute temperature.
The AD590 is particularly useful in remote sensing applica-
tions. The device is insensitive to voltage drops over long
lines due to its high-impedance current output. Any well
insulated twisted pair is sufficient for operation hundreds of
feet from the receiving circuitry. The output characteristics
also make the AD590 easy to multiplex: the current can be
switched by a CMOS multiplexer or the supply voltage can
be switched by a logic gate output.
Ordering Information
NON-
LINEARITY TEMP. RANGE
PART
(
o
C)
NUMBER
(
o
C)
AD590JH
鹵1.5
-55脳 to 150脳
PKG.
NO.
T3.A
PACKAGE
3 Ld Metal Can
(TO-52)
Pinout
AD590
(METAL CAN)
Functional Diagram
+
R1 260鈩?/div>
+
Q2
Q6
C1 26pF
R2 1040鈩?/div>
Q5
Q3
Q4
1
3
CASE
Q1
Q7
Q12
Q8
-
2
CHIP
SUBSTRATE
R3 5k鈩?/div>
Q10
1
R6 820鈩?/div>
R5 146鈩?/div>
R4 11k鈩?/div>
Q9
8
Q11
1
-
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil and Design is a trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2001, All Rights Reserved
1
File Number
3171.3
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