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AD590JH Datasheet(PDF) 8 Page - Intersil Corporation

No. de pieza AD590JH
Descripción Electrónicos  2-Wire, Current Output Temperature Transducer
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

AD590JH Datasheet(HTML) 8 Page - Intersil Corporation

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12-10
The ultra-low bias current of the ICL7611 allows the use of
large value gain resistors, keeping meter current error under
1/
2%, and therefore saving the expense of an extra meter
driving amplifier. See Figure 14.
The 50k
Ω pot trims offsets in the devices whether internal or
external, so it can be used to set the size of the difference
interval. this also makes it useful for liquid level detection
(where there will be a measurable temperature difference).
See Figure 15.
The reference junction(s) should be in close thermal contact
with the AD590 case. V+ must be at least 4V, while ICL8069
current should be set at 1mA - 2mA. Calibration does not
require shorting or removal of the thermocouple: set R1 for
V2 = 10.98mV. If very precise measurements are needed,
adjust R2 to the exact Seebeck coefficient for the thermo-
couple used (measured or from table) note V1, and set R1 to
buck out this voltage (i.e., set V2 = V1). For other thermocou-
ple types, adjust values to the appropriate Seebeck
coefficient. See Figure 16.
+15V
10k
1k
+
AD590
-
10mV/oC
20k
44.2k
0.1%
ZERO SET
115k
118k
FULL-SCALE
ADJUST
100
10k
2.7315V
M
+100
µA
+
-
-
ICL7611
FIGURE 14. CENTIGRADE THERMOMETER (0oC-100oC)
FIGURE 15. DIFFERENTIAL THERMOMETER
10k
+
NO. 1
-
VOUT = (T2 - T1) x
V+
50k
5M
10k
+
-
+
-
(10mV/oC)
741
V
-
(8V MIN)
NO. 2
V+
1
µA/oK
R2 40.2Ω
SEEBECK
COEFFICIENT = 40
µV/oK
TYPE K
VOUT
+
-
ICL8069
1.235V
4.7
µF
R1 4521Ω
40.2
V+
+
-
TC = 40µV/
oK
V1 = 10.98mV
V2 = 10.98mV
+
-
FIGURE 16. COLD JUNCTION COMPENSATION FOR TYPE K THERMOCOUPLE
AD590


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