INA821 datasheet(23/47 Pages) TI

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9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

Figure 9-1 shows the basic connections required for operation of the INA597. Connect power supply bypass

capacitors close to the device pins.

The differential input signal is connected to pins 2 and 3, as shown. The source impedances connected to the

inputs must be nearly equal to provide good common-mode rejection. An 8-Ω mismatch in source impedance

degrades the common-mode rejection of a typical device to approximately 80 dB. Gain accuracy is also slightly

affected. If the source has a known impedance mismatch, use an additional resistor in series with one input to

preserve good common-mode rejection.

9.2 Typical Applications

9.2.1 Basic Power-Supply and Signal Connections

INA597

OUT = V3 – V2

REF

12 kW

6 kW

1 µF

V–

1 µF

V+

Figure 9-1. Basic Power-Supply and Signal Connections

9.2.1.1 Design Requirements

For the application shown in Figure 9-1, the design requirements are:

• Gain of G = ½

• VREF = 0 V

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INA597

SBOS385B – AUGUST 2019 – REVISED APRIL 2021

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INA821 Datasheet(PDF) 23 Page - Texas Instruments