with a lower minimum CMRR of 62 dB, because the input signal crosses over the transition region of the input

pairs to achieve rail-to-rail operation. The common-mode range for other operating conditions is best calculated

with the INA VCM vs VOUT tool located under the Amplifiers and Comparators section of the Analog Engineer's

Calculator on ti.com. INA351-HCM model can be specifically used for applications requiring high CMRR and

corresponds to performance shown in Figure 8-1. INA351xxS model can be used for applications where the

input common mode can be expected to vary rail-to-rail and the model corresponds to performance shown in

Figure 8-2 where CMRR drops to 62-dB minimum.

Output Voltage (V)

-0.6

0

0.6

1.2

1.8

2.4

3

3.6

4.2

4.8

5.4

6

-0.6

0

0.6

1.2

1.8

2.4

3

3.6

4.2

4.8

5.4

6

D01_

VS = 5.5 V

G = 10, 20, 30, 50

VREF = VS / 2

Figure 8-1. Input Common-Mode Voltage vs Output

Voltage (High CMRR Region)

Output Voltage (V)

-0.6

0

0.6

1.2

1.8

2.4

3

3.6

4.2

4.8

5.4

6

-0.6

0

0.6

1.2

1.8

2.4

3

3.6

4.2

4.8

5.4

6

D05_

VS = 5.5 V

G = 10, 20, 30, 50

VREF = VS / 2

Figure 8-2. Input Common-Mode Voltage vs Output

Voltage

8.3.3 EMI Rejection

The INA351 uses integrated electromagnetic interference (EMI) filtering to reduce the effects of EMI from

sources such as wireless communications and densely-populated boards with a mix of analog signal chain and

digital components. EMI immunity can be improved with circuit design techniques; the INA351 benefits from

these design improvements. Texas Instruments has developed the ability to accurately measure and quantify the

immunity of an operational amplifier over a broad frequency spectrum extending from 10 MHz to 6 GHz. Figure

8-3 shows the results of this testing on the INA351. Table 8-2 shows the EMIRR IN+ values for the INA351 at

particular frequencies commonly encountered in real-world applications. The EMI Rejection Ratio of Operational

Amplifiers application report contains detailed information on the topic of EMIRR performance relating to op

amps and is available for download from www.ti.com.

Frequency (Hz)

50

60

70

80

90

100

110

1M

10M

100M

1G

A14_

G = 10

G = 20

G = 30

G = 50

Figure 8-3. EMIRR Testing

www.ti.com

INA351

SBOSAD5 – DECEMBER 2022

Copyright © 2022 Texas Instruments Incorporated

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