7.3 Feature Description

7.3.1 Amplifier Input Common-Mode Range

The INAx290 supports large input common-mode voltages from 2.7 V to 120 V and features a high DC CMRR

of 160 dB (typical) and a 85-dB AC CMRR at 50 kHz. The minimum common-mode voltage as shown in Figure

7-1 is restricted by the supply voltage. The topology of the internal amplifiers INAx290 restricts operation to

high-side, current-sensing applications.

Supply Voltage (V)

0

2.5

5

7.5

10

12.5

15

17.5

20

0

1

2

3

4

5

6

7

8

Figure 7-1. Minimum Common-Mode Voltage vs Supply

7.3.2 Input-Signal Bandwidth

Gain vs. Frequency shows the INAx290 –3-dB bandwidth is gain-dependent with gain options of 20 V/V, 50 V/V,

100 V/V, 200 V/V, and 500 V/V. The unique multistage design enables the amplifier to achieve high bandwidth

at all gains. This high bandwidth provides the throughput and fast response required for rapid detection and

processing of overcurrent events.

performance profile of the device over frequency as output voltage increases for each gain variation. As shown

higher with lower device gain options. Individual requirements determine the acceptable limits of error for

high-frequency, current-sensing applications. Testing and evaluation in the end application or circuit is required

to determine the acceptance criteria and validate whether or not the performance levels meet the system

specifications.

Output Voltage (V)

0

0.5

1

1.5

2

2.5

3

3.5

4

200

300

400

500

600

700

800

900

1000

1100

1200

G = 20

G = 50

G = 100

G = 200

G = 500

Figure 7-2. Bandwidth vs Output Voltage

INA290, INA2290, INA4290

SBOS961C – JUNE 2020 – REVISED JUNE 2021

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