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INA821 Datasheet(PDF) 32 Page - Texas Instruments

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Part # INA821
Description  35-關V Offset, 7-nV/?숰z Noise, Low-Power, Precision Instrumentation Amplifier
PDF  41 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA821 Datasheet(HTML) 32 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
32
INA821
SBOS893A – AUGUST 2018 – REVISED DECEMBER 2018
www.ti.com
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 70 and Figure 71 show typical characteristic curves for the circuit in Figure 69.
Figure 70. PLC Output Voltage vs Input Voltage
Figure 71. PLC Output Voltage vs Input Current



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