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INA821 Datasheet(PDF) 27 Page - Texas Instruments

Part # INA821
Description  INA818 35-μV Offset, 8-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier
PDF  43 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

INA821 Datasheet(HTML) 27 Page - Texas Instruments

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+IN
±IN
RG
INA818
5 V
OPA191
100 k
5 V
1 F
5 V
100 k
OUT
RG
RG
0
20
40
60
80
100
120
10
100
1k
10k
0 Ω
10 Ω
5 Ω
15 Ω
20 Ω
Frequency (Hz)
27
INA818
www.ti.com
SBOS894A – APRIL 2019 – REVISED JUNE 2019
Product Folder Links: INA818
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
Application Information (continued)
The parasitic resistance at the reference pin (RREF) creates an imbalance in the four resistors of the internal
difference amplifier, which degrades the common-mode rejection ratio (CMRR). Figure 66 shows the degradation
in CMRR of the INA818 as a result of increased resistance at the reference pin. For the best performance, keep
the source impedance to the REF pin (RREF) below 5 Ω.
Figure 66. The Effect of Increasing Resistance at the Reference Pin
Voltage-reference devices are a suitable option for providing a low-impedance voltage source for the reference
pin. However, if a resistor voltage divider generates a reference voltage, the divider must be buffered by an op
amp, as Figure 67 shows, in order to avoid CMRR degradation.
Figure 67. Using an Op Amp to Buffer Reference Voltages



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