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AD590 の電気的特性と機能

AD590のメーカーはIntersil Corporationです、この部品の機能は「2-Wire/ Current Output Temperature Transducer」です。


製品の詳細 ( Datasheet PDF )

部品番号 AD590
部品説明 2-Wire/ Current Output Temperature Transducer
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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AD590 Datasheet, AD590 PDF,ピン配置, 機能
AD590
August 1997
2-Wire, Current Output
Temperature Transducer
Features
• Linear Current Output . . . . . . . . . . . . . . . . . . . . 1µA/oK
• Wide Temperature Range . . . . . . . . . . . -55oC to 150oC
• Two-Terminal Device Voltage In/Current Out
• Wide Power Supply Range . . . . . . . . . . . . . +4V to +30V
• Sensor Isolation From Case
• Low Cost
Ordering Information
NON-
PART LINEARITY TEMP. RANGE
NUMBER
(oC)
(oC)
PACKAGE
PKG.
NO.
AD590IH
±3.0
-55 to 150 3 Ld Metal Can T3.A
(TO-52)
AD590JH
±1.5
-55 to 150 3 Ld Metal Can T3.A
(TO-52)
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 current
regulator, passing 1µA/oK for supply voltages between +4V and
+30V. Laser trimming of the chip's thin film resistors is used to
calibrate the device to 298.2µA output at 298.2oK (25oC).
The AD590 should be used in any temperature-sensing
application between -55oC to 150oC 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.
Pinout
AD590
(METAL CAN)
+1
3 CASE
-2
Functional Diagram
+
Q2
Q1
Q6
Q7
R1 260R2 1040
Q5 Q3
Q4
Q12 Q8
C1 26pF
CHIP
SUBSTRATE
R3 5kR4 11k
Q9
8
R6 820
Q10
1
R5 146
Q11
1
-
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
12-3
File Number 3171.1

1 Page





AD590 pdf, ピン配列
AD590
Trimming Out Errors
The ideal graph of current versus temperature for the AD590
is a straight line, but as Figure 1 shows, the actual shape is
slightly different. Since the sensor is limited to the range of
-55oC to 150oC, it is possible to optimize the accuracy by
trimming. Trimming also permits extracting maximum
performance from the lower-cost sensors.
The circuit of Figure 2 trims the slope of the AD590 output.
The effect of this is shown in Figure 3.
The circuit of Figure 4 trims both the slope and the offset.
This is shown in Figure 5. The diagrams are exaggerated to
show effects, but it should be clear that these trims can be
used to minimize errors over the whole range, or over any
selected part of the range. In fact, it is possible to adjust the
I-grade device to give less than 0.1oC error over the range
0oC to 90oC and less than 0.05oC error from 25oC to 60oC.
35.7k
R1 2k
+10V
97.6kR2 5k
+
AD590
-
VOUT = 100mV/ oC
V-
R1 = OFFSET
R2 = SLOPE
FIGURE 4. SLOPE AND OFFSET TRIMMING
IDEAL
ACTUAL
(GREATLY
EXAGGERATED)
T (oK)
FIGURE 1. TRIMMING OUT ERRORS
+5V
+
+
-
AD590
+
R 100
950
VOUT = 1mV/oK
R = SLOPE
FIGURE 2. SLOPE TRIMMING
FIGURE 5A. UNTRIMMED
FIGURE 5B. TRIM ONE: OFFSET
IDEAL
ACTUAL
TRIMMED
T (oK)
FIGURE 3. EFFECT OF SLOPE TRIM
12-5
FIGURE 5C. TRIM TWO: SLOPE


3Pages


AD590 電子部品, 半導体
AD590
Typical Applications
+15V
+5V + + +
(ADDITIONAL SENSORS)
+ ---
- AD590
VOUT = 1mV/oK
1k
333.3
0.1%
(FOR 3 SENSORS)
VOUT (AVG) = (R) Σni
FIGURE 8. AVERAGE TEMPERATURE SENSING SCHEME
FIGURE 6A.
423
The sum of the AD590 currents appears across R, which is
chosen by the formula: R = 1----0--n--k------ ,
where n = the number of sensors. See Figure 8.
+15V
HEATER
ELEMENT
298.2
218
218oK
(-55oC)
298.2oK
(25oC)
TEMPERATURE
FIGURE 6B.
423oK
(150oC)
FIGURE 6. SIMPLE CONNECTION. OUTPUT IS PROPORTIONAL
TO ABSOLUTE TEMPERATURE
+
-
R
0.1%
AD590
C
R1
R2
ICL8069
1.23V R3
LM311
37
2
1
4
RB
VZERO
FIGURE 9. SINGLE SETPOINT TEMPERATURE CONTROLLER
+15V
+
-
+
-
+
-
10k
0.1%
AD590 (AS MANY AS DESIRED)
The AD590 produces a temperature-dependent voltage
across R (C is for filtering noise). Setting R2 produces a
scale-zero voltage. For the celsius scale, make R = 1k
and VZERO = 0.273V. For Fahrenheit, R = 1.8kand
VZERO = 0.460V. See Figure 9.
500µA
M
VOUT (MIN)
+
AD590
-
4V < VBATT
<30V +
-
FIGURE 7. LOWEST TEMPERATURE SENSING SCHEME.
AVAILABLE CURRENT IS THAT OF THE
“COLDEST” SENSOR
FIGURE 10. SIMPLEST THERMOMETER
Meter displays current output directly in degrees Kelvin.
using the AD590J, sensor output is within ±10 degrees over
the entire range. See Figure 10.
12-8

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共有リンク

Link :


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