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INA821 Datasheet(PDF) 27 Page - Texas Instruments

Part # INA821
Description  INA821 35-μV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier
PDF  50 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
INA821
5 V
OPA191
100 k
5 V
1 F
5 V
100 k
OUT
Copyright © 2017, Texas Instruments Incorporated
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
INA821
www.ti.com
SBOS893D – AUGUST 2018 – REVISED JUNE 2020
Product Folder Links: INA821
Submit Documentation Feedback
Copyright © 2018–2020, 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 that results in a degraded common-mode rejection ratio (CMRR). Figure 66 shows the
degradation in CMRR of the INA821 as a result of the increased resistance at the reference pin. For the best
performance, keep the source impedance to the REF pin (RREF) less than 5 Ω.
Figure 66. The Effect of Increasing Resistance at the Reference Pin
Voltage reference devices are an excellent option for providing a low-impedance voltage source for the reference
pin. However, if a resistor voltage divider generates a reference voltage, buffer the divider by an op amp, as
shown in Figure 67, to avoid CMRR degradation.
Figure 67. Use an Op Amp to Buffer Reference Voltages



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