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AD590KH Fiches technique(PDF) 10 Page - Analog Devices

No de pièce AD590KH
Description  Two-Twrminal IC Temperature Transducer
Download  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD590KH Fiches technique(HTML) 10 Page - Analog Devices

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AD590
Rev. C | Page 10 of 16
GENERAL APPLICATIONS
Figure 14 demonstrates the use of a low cost digital panel meter
for the display of temperature on either the Kelvin, Celsius, or
Fahrenheit scales. For Kelvin temperature, Pins 9, 4, and 2 are
grounded; for Fahrenheit temperature, Pins 4 and 2 are left
open.
6
5
9
4
2
OFFSET
CALIBRATION
5V
GAIN
SCALING
OFFSET
SCALING
3
8
AD2040
GND
AD590
+
Figure 14. Variable Scale Display
The above configuration yields a 3-digit display with 1°C or 1°F
resolution, in addition to an absolute accuracy of ±2.0°C over
the −55°C to +125°C temperature range, if a one-temperature
calibration is performed on an AD590K, AD590L, or AD590M.
Connecting several AD590 units in series as shown in Figure 15
allows the minimum of all the sensed temperatures to be
indicated. In contrast, using the sensors in parallel yields the
average of the sensed temperatures.
AD590
+
AD590
+
AD590
+
+
VT MIN
10k
(0.1%)
+
AD590
+
+
+
VT AVG
333.3
(0.1%)
5V
15V
Figure 15. Series and Parallel Connection
The circuit in Figure 16 demonstrates one method by which
differential temperature measurements can be made. R1 and R2
can be used to trim the output of the op amp to indicate a
desired temperature difference. For example, the inherent offset
between the two devices can be trimmed in. If V+ and V− are
radically different, then the difference in internal dissipation
causes a differential internal temperature rise. This effect can be
used to measure the ambient thermal resistance seen by the
sensors in applications such as fluid-level detectors or
anemometry.
AD590L
#2
+
AD590L
#1
+
R4
10k
R3
10k
R1
5M
R2
50k
V+
(T1 – T2)
× (10mV/°C)
V–
AD707A
+
Figure 16. Differential Measurements
Figure 17 is an example of a cold junction compensation circuit
for a Type J thermocouple using the AD590 to monitor the
reference junction temperature. This circuit replaces an ice-bath
as the thermocouple reference for ambient temperatures
between 15°C and 35°C. The circuit is calibrated by adjusting RT
for a proper meter reading with the measuring junction at a
known reference temperature and the circuit near 25°C. Using
components with the TCs as specified in Figure 17,
compensation accuracy is within ±0.5°C for circuit
temperatures between 15°C and 35°C. Other thermocouple
types can be accommodated with different resistor values. Note
that the TCs of the voltage reference and the resistors are the
primary contributors to error.
+
REFERENCE
JUNCTION
IRON
+
7.5V
AD590
AD580
CONSTANTAN
MEASURING
JUNCTION
RESISTORS ARE 1%, 50PPM/°C
METER
+
+
CU
52.3
8.66k
VOUT
RT
1k
Figure 17. Cold Junction Compensation Circuit for Type J Thermocouple
Figure 18 is an example of a current transmitter designed to be
used with 40 V, 1 kΩ systems; it uses its full current range of
4 mA to 20 mA for a narrow span of measured temperatures. In
this example, the 1 µA/K output of the AD590 is amplified to
1 mA/°C and offset so that 4 mA is equivalent to 17°C and
20 mA is equivalent to 33°C. RT is trimmed for proper reading
at an intermediate reference temperature. With a suitable choice
of resistors, any temperature range within the operating limits
of the AD590 may be chosen.


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