Texas Instruments has introduced an instrumentation amplifier targeted at improving accuracy and stability while extending battery life in a variety of precision, low-power applications such as portable medical, handheld instrumentation, weigh scales and data acquisition. The INA333 utilises TI’s zero-drift technology, which incorporates a proprietary switched-capacitor notch filter to eliminate chopping noise and provide very low input voltage noise of 50 nV/rt-Hz. The device features a versatile three op-amp architecture to simplify design and reduce board space. It uses only 75 μA of quiescent current and operates on power supplies as low as 1,8 V. Low offset voltage of 25 μV and offset drift of 0,1 μV/C deliver excellent accuracy and long-term stability. Applications with high impedance sources will benefit from low input bias current of 200 pA. Special filters have been integrated in series with the inputs of the INA333 to reduce RF interference.
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