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EL8176 Datasheet(PDF) 11 Page - Intersil Corporation

Part # EL8176
Description  Micropower Single Supply Rail-to-Rail Input-Output Precision Op Amp
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

EL8176 Datasheet(HTML) 11 Page - Intersil Corporation

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11
FN7436.6
October 26, 2006
Proper Layout Maximizes Performance
To achieve the maximum performance of the high input
impedance and low offset voltage of the EL8176, care
should be taken in the circuit board layout. The PC board
surface must remain clean and free of moisture to avoid
leakage currents between adjacent traces. Surface coating
of the circuit board will reduce surface moisture and provide
a humidity barrier, reducing parasitic resistance on the
board. The use of guard rings around the amplifier inputs will
further reduce leakage currents. Figure 40 shows how the
guard ring should be configured and Figure 41 shows the top
view of how a surface mount layout can be arranged. The
guard ring does not need to be a specific width, but it should
form a continuous loop around both inputs. By setting the
guard ring voltage equal to the voltage at the non-inverting
input, parasitic capacitance is minimized as well. For further
reduction of leakage currents, components can be mounted
to the PC board using Teflon standoff insulators.
Typical Applications
Thermocouples are the most popular temperature-sensing
device because of their low cost, interchangeability, and
ability to measure a wide range of temperatures. The
EL8176 is used to convert the differential thermocouple
voltage into single-ended signal with 10X gain. The
EL8176's rail-to-rail input characteristic allows the
thermocouple to be biased at ground and the converter to
run from a single 5V supply.
4
3
1
EL8176
IN
V+
FIGURE 40.
HIGH IMPEDANCE INPUT
6
5
2
FIGURE 41.
-
+
5V
+
V+
V-
EL8176
K TYPE
THERMOCOUPLE
10k
Ω
R3
10k
Ω
R2
R4
100k
Ω
R1
100k
Ω
410µV/°C
FIGURE 42. THERMOCOUPLE AMPLIFIER
EL8176


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