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INA826 Datasheet(PDF) 29 Page - Texas Instruments

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Part # INA826
Description  Precision, 200-關A Supply Current, 2.7-V to 36-V Supply Instrumentation Amplifier with Rail-to-Rail Output
PDF  40 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA826 Datasheet(HTML) 29 Page - Texas Instruments

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NC
+Vs
-Vs
+Vs
-Vs
+Vs
Rg 5k
Vin
Temp
GND
Vout
Trim
U2 REF5025
Rset 2.5k
Rparasitic 5
V1 15
V2 15
-
+
Vout
RTD 100
A
+
Iset
-
+
Vset
VirtualGND
-
+
+
U1 OPA188
R2 1.5M
+
+
-
Rg
Rg
Ref
U4 INA826
Vref5025
+Vs
-Vs
INA826
www.ti.com
SBOS562B
– AUGUST 2011 – REVISED DECEMBER 2011
Figure 69 shows an example of how the INA826 can be used for RTD signal conditioning. This circuit creates an
excitation current (ISET) by forcing +2.5 V from the REF5025 across RSET. The zero-drift, low-noise OPA188
creates the virtual ground that maintains a constant differential voltage across RSET with changing common-mode
voltage. This voltage is necessary because the voltage on the positive input of the INA826 fluctuates over
temperature as a result of the changing RTD resistance. Click the following link to download the TINA-TI file:
RTD Circuit.
Figure 69. RTD Signal Conditioning
Copyright
© 2011, Texas Instruments Incorporated
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Product Folder Link(s): INA826



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