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ISL28286 데이터시트(PDF) 13 Page - Intersil Corporation

부품명 ISL28286
상세설명  Dual Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Precision Op-Amp
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL28286 데이터시트(HTML) 13 Page - Intersil Corporation

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13
FN6312.0
September 22, 2006
to the PC board using Teflon standoff insulators.
Example Application
Thermocouples are the most popular temperature-sensing
device because of their low cost, interchangeability, and
ability to measure a wide range of temperatures. The
ISL28286 (Figure 45) is used to convert the differential
thermocouple voltage into single-ended signal with 10X gain.
The ISL28286's rail-to-rail input characteristic allows the
thermocouple to be biased at ground and the converter to
run from a single 5V supply.
Current Limiting
The ISL28286 and ISL28486 have no internal current-
limiting circuitry. If the output is shorted, it is possible to
exceed the Absolute Maximum Rating for output current or
power dissipation, potentially resulting in the destruction of
the device.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (TJMAX) for all applications
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related as follows:
where:
•PDMAXTOTAL is the sum of the maximum power
dissipation of each amplifier in the package (PDMAX)
•PDMAX for each amplifier can be calculated as follows:
where:
•TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
•PDMAX = Maximum power dissipation of 1 amplifier
•VS = Supply voltage
•IMAX = Maximum supply current of 1 amplifier
•VOUTMAX = Maximum output voltage swing of the
application
•RL = Load resistance
1/2 ISL28286
IN
V+
FIGURE 44. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
HIGH IMPEDANCE INPUT
-
+
5V
+
V+
V-
ISL28286
K TYPE
THERMOCOUPLE
10k
Ω
R3
10k
Ω
R2
R4
100k
Ω
R1
100k
Ω
410µV/°C
FIGURE 45. THERMOCOUPLE AMPLIFIER
T
JMAX
T
MAX
θ
JAxPDMAXTOTAL
()
+
=
(EQ. 1)
PD
MAX
2*V
S
I
SMAX
V
S
(
- V
OUTMAX )
V
OUTMAX
R
L
----------------------------
×
+
×
=
(EQ. 2)
ISL28286, ISL28486


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