8.3 Feature Description

8.3.1 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 is restricted by the

supply voltage as shown in Figure 8-1. 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 8-1. Minimum Common-Mode Voltage vs Supply

8.3.1.1 Input-Signal Bandwidth

The INAx290 –3-dB bandwidth is gain dependent with several gain options of 20 V/V, 50 V/V, 100 V/V, 200 V/V,

and 500 V/V as shown in Figure 7-8. The unique multistage design enables the amplifier to achieve high

bandwidth at all gains. This high bandwidth provides the throughput and fast response that is required for the

rapid detection and processing of overcurrent events.

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

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 8-2. Bandwidth vs Output Voltage

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INA290, INA2290

SBOS961A – JUNE 2020 – REVISED SEPTEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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