INA118U/2K5 – TEXAS INSTRUMENTS

The Texas Instruments INA118U/2K5 is a precision, current-feedback instrumentation amplifier optimized for low-voltage, high-precision applications. Packaged in a small, 8-pin SOIC (surface mount) package, it features a 2.5kΩ internal gain resistor, providing a fixed gain of 10. Its input common-mode voltage range extends to within 0.1V of both positive and negative supply rails, enabling operation with low supply voltages down to ±2.25V. The device boasts a typical input offset voltage of only 25µV, maximizing accuracy in low-level signal measurements. Its high common-mode rejection ratio (CMRR) of typically 100dB ensures minimal interference from common-mode noise._x000D_
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The INA118U/2K5 excels in applications requiring precise amplification of differential signals with limited bandwidth. Its current-feedback architecture offers advantages over voltage-feedback designs, including high bandwidth and improved stability with capacitive loads. Common use cases include transducer signal conditioning (e.g., thermocouples, strain gauges), bridge amplifier circuits, and low-voltage data acquisition systems. Its low power consumption and compact footprint make it ideal for portable and space-constrained designs. While the fixed gain limits flexibility, the inherent precision and low-voltage operation make it a compelling choice when these factors are paramount.