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

13

INA290

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SBOS961 – JUNE 2020

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Feature Description (continued)

7.3.1.1 Input-Signal Bandwidth

The INA290 –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 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 in

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.

Figure 36. Bandwidth vs Output Voltage

7.3.1.2 Low Input Bias Current

The INA290 input bias current draws 20 µA (typical) even with common-mode voltages as high as 120 V. This

enables precision current sensing in applications where the sensed current is small or applications that require

lower input leakage current.

levels accurately across the wide operating temperature of –40 °C to +125 °C. The capability to measure low

sense voltages enables accurate measurements at lower load currents, and also allows reduction of the sense

resistor value for a given operating current, which minimizes the power loss in the current sensing element.

7.3.1.4 Wide Fixed Gain Output

The INA290 gain error is < 0.1% at room temperature for most gain options, with a maximum drift of 5 ppm/°C

over the full temperature range of –40 °C to +125 °C. The INA290 is available in multiple gain options of 20 V/V,

50 V/V, 100 V/V, 200 V/V, and 500 V/V, which the system designer should select based on their desired signal-

to-noise ratio and other system requirements.

The INA290 closed-loop gain is set by a precision, low-drift internal resistor network. The ratio of these resistors

are excellently matched, while the absolute values may vary significantly. TI does not recommend adding

additional resistance around the INA290 to change the effective gain because of this variation, however. The

typical values of the gain resistors are described in Table 1.