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INA321E/250

TIINA321E/250

Texas Instruments
Instrumentation Amplifier 1 Circuit Rail-to-Rail 8-VSSOP
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Overview

The INA321E/250 is a micro-power instrumentation amplifier designed for high-precision signal conditioning in battery-powered applications. It features a rail-to-rail output and a low quiescent current of 40uA, making it suitable for portable equipment. The device operates across a wide supply range of 2.7V to 5.5V and includes a shutdown mode that reduces current to 0.01uA.

Why Choose This Part

The INA321 offers a very low input bias current of 0.5pA, which is ideal for high-impedance sources. Its rail-to-rail output maximizes dynamic range on low-voltage rails, while the 500kHz bandwidth provides sufficient speed for most sensor applications. The ultra-low power consumption and shutdown feature significantly extend battery life in portable designs.

Applications

Industrial Sensor Amplifiers
Conditioning low-level differential signals from bridge sensors and transducers in industrial environments.
Physiological Amplifiers
High-impedance input stage for medical monitoring equipment such as ECG and EEG sensors.
A/D Converter Signal Conditioning
Buffering and scaling analog signals to maximize the dynamic range of high-resolution ADCs.
Differential Line Receivers
Extracting signals from noisy communication lines in field utility meters and industrial networks.

Key Specifications

Slew Rate 0.4V/us
Output Type Rail-to-Rail
Mounting Type Surface Mount
-3db Bandwidth 500 kHz
Amplifier Type Instrumentation
Package / Case 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Current - Supply 40uA
Number of Circuits 1
Current - Input Bias 0.5 pA
Operating Temperature -55degC ~ 125degC
Voltage - Input Offset 200 uV
Supplier Device Package 8-VSSOP
Current - Output / Channel 16 mA
Voltage - Supply Span (Max) 5.5 V
Voltage - Supply Span (Min) 2.5 V

Getting Started

When designing with the INA321, ensure decoupling capacitors are placed close to the V+ pin to maintain stability. Use high-precision resistors for gain setting to maintain the 0.02 percent accuracy potential of the internal stages. For evaluation, the device can be mounted to a standard MSOP-8 to DIP adapter for use on breadboards or prototyping systems.