INA2290A2IDGKR

Overview

The INA2290A2IDGKR is a dual-channel, ultra-precise current-sense amplifier from Texas Instruments. It operates with a common-mode voltage range of 2.7 V to 120 V and supports a supply voltage from 2.7 V to 20 V. The device features a fixed gain of 50 V/V, a maximum offset voltage of ±20 µV, and a typical DC common-mode rejection ratio of 160 dB. It offers a bandwidth of 1.1 MHz and draws 370 µA per channel. Packaged in an 8-pin VSSOP, it functions within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Ultra-precise zero-drift architecture ensures high accuracy across wide temperature ranges
• Wide common-mode voltage capability up to 120 V for flexible high-side sensing
• High bandwidth and fast slew rate enable rapid overcurrent protection detection
• Dual-channel design provides space-efficient integration for multi-rail monitoring

Applications

• Active antenna system mMIMO (AAS)
• Macro remote radio unit (RRU) power monitoring
• 48-V rack server current sensing
• 48-V merchant network and server power supplies
• Precision test and measurement equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure that the selected component matches the required gain option and thermal performance for the intended operating environment. Cross-reference the datasheet revision history for any updates regarding availability or recommended design changes.

Selection Notes

Select this component when dual-channel precision is required alongside high common-mode voltage tolerance. The 50 V/V gain option suits applications needing moderate signal amplification without excessive output swing. Consider the 1.1 MHz bandwidth for dynamic load conditions and verify that the 8-VSSOP package fits the available PCB real estate constraints.

Part Context

This device belongs to the INAx290 family, which includes single-channel (INA290) and quad-channel (INA4290) variants. All members share the same core ultra-precise architecture and wide common-mode range. The INA2290 specifically addresses designs requiring two independent current sense channels in a compact surface-mount footprint.

Replacement Considerations

Official substitutes within the same family include the INA290 for single-channel needs or the INA4290 for four-channel requirements. Ensure the replacement maintains the 50 V/V gain configuration if signal scaling must remain identical. Verify that the thermal resistance and package dimensions are compatible with the existing board layout.

FAQ

What is the minimum common-mode voltage relative to the supply voltage?

The minimum common-mode voltage is restricted by the supply voltage; it cannot go below VS under normal operation, though it can survive voltages down to -20 V.

How does the bandwidth vary with gain settings?

The -3 dB bandwidth is gain-dependent. For the A2 devices with 50 V/V gain, the bandwidth is 1.1 MHz at room temperature.

Is this amplifier suitable for low-side current sensing?

No, the internal topology restricts operation to high-side, current-sensing applications only.