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AD590JCPZ-R5 Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças AD590JCPZ-R5
Descrição Electrónicos  2-Terminal IC Temperature Transducer
Download  16 Pages
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD590JCPZ-R5 Folha de dados(HTML) 10 Page - Analog Devices

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AD590
Data Sheet
Rev. G | Page 10 of 16
GENERAL APPLICATIONS
Figure 17 shows a typical use of the AD590 in a remote
temperature sensing application. The AD590 is used as a
thermometer circuit that measures temperature from −55°C to
+150°C, with an output voltage of 1 mV/°K. Because the
AD590 measures absolute temperature (its nominal output is
1 mA/K), the output must be offset by 273.2 mA to read out in
degrees Celsius.
Figure 17. Variable Scale Display
Connecting several AD590 units in series, as shown in Figure 18,
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.
Figure 18. Series and Parallel Connection
The circuit in Figure 19 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.
Figure 19. Differential Measurements
Figure 20 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 20, 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.
Figure 20. Cold Junction Compensation Circuit for Type J Thermocouple
AD590
IT
IT
IT
+
7V
1k
0.1% LOW
TCR RESISTOR
1mV/k
AD590
+
AD590
+
AD590
+
+
VT MIN
10k
(0.1%)
+
AD590
+
+
+
VT AVG
333.3
(0.1%)
5V
15V
AD590L
#2
+
AD590L
#1
+
R4
10k
R3
10k
R1
5M
R2
50k
V+
(T1 – T2) × (10mV/°C)
V–
OP177
+
+
REFERENCE
JUNCTION
IRON
+
7.5V
AD590
AD580
CONSTANTAN
MEASURING
JUNCTION
RESISTORS ARE 1%, 50ppm/°C
METER
+
+
CU
52.3
8.66k
VOUT
RT
1k


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