1 Features

• Wide common-mode voltage:

– Operational voltage: 2.7 V to 120 V

– Survival voltage: −20 V to +122 V

• Excellent CMRR:

– 160-dB DC

– 85-dB AC at 50 kHz

• Accuracy

– Gain:

• Gain error: ±0.1% (maximum)

• Gain drift: ±5 ppm/°C (maximum)

– Offset:

• Offset voltage: ±12 μV (maximum)

• Offset drift: ±0.2 μV/°C (maximum)

• Available gains:

– A1 devices: 20 V/V

– A2 devices: 50 V/V

– A3 devices: 100 V/V

– A4 devices: 200 V/V

– A5 devices: 500 V/V

• High bandwidth: 1.1 MHz

• Slew rate: 2 V/μs

• Quiescent current: 370 μA (per channel)

2 Applications

• Active antenna system mMIMO (AAS)

• Macro remote radio unit (RRU)

• 48-V rack server

• 48-V merchant network & server power supply

• Test and measurement

3 Description

The INAx290 is an ultra-precise, current-sense

amplifier that can measure voltage drops across shunt

resistors over a wide common-mode range from 2.7

V to 120 V. The ultra-precise current measurement

accuracy is achieved thanks to the combination of an

ultra-low offset voltage of ±12 μV (maximum), a small

gain error of ±0.1% (maximum), and a high DC CMRR

of 160 dB (typical). The INAx290 is not only designed

for DC current measurement, but also for high-speed

applications (such as fast overcurrent protection, for

example) with a high bandwidth of 1.1 MHz (at gain of

20 V/V) and an 85-dB AC CMRR (at 50 kHz).

The INAx290 provides the capability to make ultraprecise

current measurements by sensing the voltage

drop across a shunt resistor over a wide commonmode

range from 2.7 V to 120 V. The INAx290

devices come in highly space-efficient packages.

The single-channel INA290 device is featured in the

SC-70 package, the dual-channel INA2290 device

is available in the MSOP-8 package, and the quadchannel

INA4290 device is available in the 4 mm x 4

mm QFN package.

The INAx290 operates from a single 2.7-V to 20-V

supply with the single channel device only drawing

370-μA supply current per channel (typical). The

devices are available with five gain options: 20 V/V,

50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset

of the zero-drift architecture enables current sensing

with low ohmic shunts as specified over the extended

operating temperature range (−40°C to +125°C).