INA2322EA/2K5

Overview

The INA2322EA/2K5 is a dual-channel, low-cost, micropower CMOS instrumentation amplifier from the INA322 family. It features rail-to-rail output swing and operates on single or bipolar supplies ranging from +2.7V to +5.5V. The device offers a gain range of 5 V/V to 1000 V/V set by external resistors, with a typical quiescent current of 40µA per channel. Key electrical specifications include a 500kHz bandwidth at G=5, 10pA input bias current, and an operating temperature range of -55°C to +125°C.

Feature Summary

• Features a shutdown mode that reduces quiescent current to less than 1µA while maintaining nanosecond return times for low-power applications.
• Provides high gain accuracy with externally programmable gain settings using standard resistors.
• Delivers rail-to-rail output swing capability suitable for driving capacitive-input A/D converters directly.
• Maintains high common-mode rejection ratio (CMRR) over frequency to effectively reject line noise.

Applications

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

Procurement Notes

Verify the specific package marking and ordering suffix to ensure correct reel quantities. Confirm supply voltage requirements match the operational range. Check thermal resistance values for the TSSOP-14 package during PCB layout planning. Ensure proper handling precautions are taken due to electrostatic sensitivity.

Selection Notes

Select this component when dual-channel precision amplification is required within a micropower constraint. The external gain setting allows flexibility for various signal levels. Consider the rail-to-rail output feature if interfacing directly with ADCs without additional buffering stages is desired.

Part Context

This part belongs to the INA322 family of micropower instrumentation amplifiers. It shares architectural similarities with the single-channel INA322 but integrates two independent channels into a single TSSOP-14 package. The family is designed for cost-sensitive applications requiring high performance in small form factors.

Replacement Considerations

INA2322EA/250 is the same device packaged in tape and reel quantities of 250 instead of 2500.

FAQ

How is the gain of the INA2322 configured?

The gain is set by external resistors connected between pins 1, 5, and 6. The equation is G = 5 + 5(R2/R1), allowing gains from 5 V/V up to 1000 V/V.

What is the function of the Shutdown pin?

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

Can the INA2322 drive capacitive loads directly?

Yes, the low output impedance makes it suitable for directly driving capacitive-input A/D converters, though stability should be verified with specific load capacitance values.