INA2322EA/250G4

Overview

The INA2322EA/250G4 is a dual-channel, micropower, single-supply CMOS instrumentation amplifier manufactured by Texas Instruments. It operates within a supply voltage range of +2.7V to +5.5V and supports an extended temperature range from -55°C to +125°C. The device features a quiescent current of 40µA per channel and less than 1µA in shutdown mode. Key electrical specifications include a 500kHz bandwidth at G=5, a common-mode rejection ratio (CMRR) of 60dB, and an input bias current of 10pA. Gain is set via external resistors with a minimum internal gain of 5V/V.

Feature Summary

• Dual-channel architecture providing two independent instrumentation amplifiers in a single package
• Rail-to-rail output swing capability for gains of 10 or greater
• Nanosecond-scale transition into and out of low-power shutdown mode
• High-precision gain accuracy with user-programmable external resistor setting

Applications

• Industrial sensor signal conditioning including bridge, RTD, and thermistor interfaces
• Physiological signal amplification such as ECG, EEG, and EMG circuits
• Signal conditioning stages for A/D converters in data acquisition systems
• Differential line receivers requiring integrated gain capabilities

Procurement Notes

Verify the specific suffix 'G4' against the manufacturer's latest documentation to confirm compliance status and material composition details. Ensure the TSSOP-14 package variant matches the required footprint for PCB layout. Confirm that the '/250' designation aligns with the intended tape and reel quantity requirements for the manufacturing process.

Selection Notes

Select this component when dual-channel precision amplification is required alongside strict power consumption limits. The device is suitable for applications needing high input impedance and low bias current. Consider the external gain setting requirement if precise gain values other than the base 5V/V are necessary. Evaluate the rail-to-rail output performance relative to the specific load conditions expected in the design.

Part Context

This part belongs to the INA322 family of micropower instrumentation amplifiers. It serves as the dual-channel counterpart to the single-channel INA322EA. Both variants share identical core electrical characteristics, including bandwidth, noise profiles, and shutdown functionality. The family is designed to replace discrete solutions while offering improved reliability and reduced board space.

Replacement Considerations

INA322EA/250G4

FAQ

How is the gain configured for the INA2322?

The gain is set using external resistors connected between pins 1, 5, and 6. The formula is G = 5 + 5(R2/R1), allowing for gains greater than 5V/V.

What is the input bias current specification?

The input bias current is typically 10pA, making the device suitable for high-impedance source applications.

Does the output swing to the positive rail?

The output swings rail-to-rail only when the gain is 10 or greater. At lower gains, such as the default 5V/V, it does not reach the positive rail.