Analogue, Mixed Signal, LSI


Low power instrumentation amp

12 November 2008 Analogue, Mixed Signal, LSI

Texas Instruments introduced what it claimed were the industry’s lowest power zero-drift instrumentation amplifier. The INA333 utilises 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. It consumes only 75 μA of quiescent current and operates on power supplies as low as 1,8 V. Offset voltage is 25 μV and offset drift is 0,1 μV/C. Applications with high impedance sources can benefit from low input bias current of 200 pA. Special filters have been integrated in series with the inputs of the device to reduce RF interference; this can dramatically reduce susceptibility to RF-induced offset voltage variations, which can be a critical advantage in applications that require DC stability, such as weigh scales.



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