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INA821 Datasheet(PDF) 29 Page - Texas Instruments

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Part # INA821
Description  35-uV Offset, 7-nV/?숰z Noise, Low-Power, Precision Instrumentation Amplifier
PDF  36 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA821 Datasheet(HTML) 29 Page - Texas Instruments

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background image
0
1
2
3
4
5
-10
-5
0
5
10
Input Voltage (V)
C001
0
1
2
3
4
5
-20
-10
0
10
20
Input Current (mA)
C001
:
:
:
G
49.4 k
49.4 k
R
10.4 k
G 1
5.75 1
V
V
OUT
REF
-
V
D
G =
=
= 5.75
4.8 V
2.5 V
400 mV
-
V
V
R
V
1
D
V
V
IN
-
D
´
R
2
R + R
1
2
V = V
R
D
IN
2
=
´
®
= 4.167 kW
29
INA821
www.ti.com
SBOS893 – AUGUST 2018
Product Folder Links: INA821
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
Typical Application (continued)
Use Equation 5 to calculate R2 if VD = ±400 mV, VIN = ±10 V, and R1 = 100 kΩ.
(5)
The value from Equation 5 is not a standard 0.1% value, so 4.17 kΩ is selected. R1 and R2 use 0.1% tolerance
resistors to minimize error.
Use Equation 6 to calculate the gain of the instrumentation amplifier.
(6)
Equation 7 calculates the gain-setting resistor value using the INA821 gain equation (Equation 1.)
(7)
Use a standard 0.1% resistor value of 10.5 kΩ for this design.
9.2.3 Application Curves
Figure 66 and Figure 67 show typical characteristic curves for the circuit in Figure 65.
Figure 66. PLC Output Voltage vs Input Voltage
Figure 67. PLC Output Voltage vs Input Current



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