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).