INA2322EA/2K5G4

Overview

The INA2322EA/2K5G4 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 features a quiescent current of 40µA per channel, dropping below 1µA in shutdown mode. The device offers a gain bandwidth product of 500kHz at a gain of 5V/V and supports user-programmable gains from 5V/V to 1000V/V via external resistors. Key electrical specifications include an input bias current of 10pA, an input offset voltage of ±10mV, and a common-mode rejection ratio of 60dB to 73dB. It is housed in a TSSOP-14 package and functions reliably across a temperature range of -55°C to +125°C.

Feature Summary

• Features a low-power design with 40µA per channel consumption and less than 1µA in shutdown mode for battery applications.
• Provides rail-to-rail output swing capability for gains of 10 or greater, suitable for driving A/D converters.
• Offers high gain accuracy with externally programmable gain settings ranging from 5V/V to 1000V/V.
• Includes a shutdown pin that allows the device to enter sleep mode within nanoseconds.

Applications

• Industrial sensor amplifiers including bridge, RTD, thermistor, and position sensors
• Physiological signal amplification such as ECG, EEG, and EMG
• Signal conditioning for A/D converters
• Differential line receivers with gain
• Field utility meters and PCMCIA cards

Procurement Notes

Verify the specific ordering suffix matches the required packaging quantity. The /2K5 designation indicates availability in tape and reel format containing 2500 devices. Confirm the package type corresponds to the TSSOP-14 variant for the dual-channel configuration. Ensure the component status is listed as active for new designs before finalizing procurement orders.

Selection Notes

Select this component when a dual-channel instrumentation amplifier with micropower consumption is required. It is suitable for applications needing programmable gain up to 1000V/V and operation on single supplies between 2.7V and 5.5V. Consider the shutdown feature for power-sensitive systems and verify that the TSSOP-14 package fits the board layout constraints.

Part Context

The INA2322EA/2K5G4 belongs to the INA322 family of micropower, single-supply CMOS instrumentation amplifiers. This family includes single-channel variants like the INA322 and dual-channel versions like the INA2322. The series is characterized by low cost, low noise, and wide-range single-supply or bipolar-supply operation capabilities.

Replacement Considerations

The INA322EA serves as the single-channel equivalent within the same family. Verify compatibility if transitioning between channel counts while maintaining similar electrical characteristics and package requirements.

FAQ

How is the gain of the INA2322 configured?

The gain is set using external resistors R1 and R2 connected to the RG pin. The formula is G = 5 + 5(R2/R1), allowing gains from 5V/V to 1000V/V.

What is the function of the Shutdown pin?

Pulling the Shutdown pin below 0.8V (on a 5V supply) activates sleep mode, reducing quiescent current to less than 1µA. The device returns to normal operation within nanoseconds.

Does the output swing to the positive rail?

The output swings to the positive rail only when the gain is 10 or greater. For gains less than 10, the output does not reach the positive rail.