INA126PA – TEXAS INSTRUMENTS

The Texas Instruments INA126PA is a precision, low-power, current-feedback instrumentation amplifier packaged in a 8-pin SOIC (small outline integrated circuit). It boasts a remarkably low input bias current of typically 10 pA, crucial for high-impedance sensor applications. Its input common-mode voltage range extends from -0.1V to V_S + 0.1V, where V_S is the supply voltage, typically ±15V, offering flexibility in various power supply schemes. The device features a high gain bandwidth product of 1.5 MHz, enabling accurate amplification of relatively high-frequency signals. Gain is externally set via a single resistor, simplifying design and reducing component count. Output voltage swing is typically within ±12V with a ±15V supply._x000D_
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The INA126PA excels in applications requiring high precision and low noise amplification of differential signals, such as thermocouple signal conditioning, strain gauge measurements, and low-level sensor interface circuits. Its low input bias current minimizes errors introduced by high-impedance sources. The current-feedback architecture contributes to its high bandwidth and fast settling time. While its power consumption is relatively low, designers should consider its sensitivity to common-mode rejection ratio (CMRR) degradation at higher frequencies when selecting operating parameters. The SOIC package is well-suited for surface-mount PCB assembly.