7.3.1.2 Low Input Bias Current

The INA290-Q1 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.

input architecture of the INA290-Q1 provides the low offset voltage and low offset drift needed to measure low

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-Q1 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-Q1 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-Q1 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-Q1 to change the effective gain because of this variation,

however. The typical values of the gain resistors are described in Table 7-1.

Table 7-1. Fixed Gain Resistor

GAIN

R1

RL

20 (V/V)

25 kΩ

500 kΩ

50 (V/V)

10 kΩ

500 kΩ

100 (V/V)

10 kΩ

1000 kΩ

200 (V/V)

5 kΩ

1000 kΩ

500 (V/V)

2 kΩ

1000 kΩ

7.3.1.5 Wide Supply Range

The INA290-Q1 operates with a wide supply range from a 2.7 V to 20 V. The output stage supports a full-scale

measurements. For a gain of 20 V/V, the maximum differential input acceptable is 1 V.

The offset of the gain of INA290-Q1A1 device is ±25 μV, and the INA290-Q1A1 is capable of measuring a wide

dynamic range of current up to 92 dB.

INA290-Q1

SBOS995A – OCTOBER 2019 – REVISED NOVEMBER 2020

www.ti.com

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