Op-amps offer superior accuracy for instrumentation applications

26 July 2006 Analogue, Mixed Signal, LSI

With the expansion of its family of high-precision op-amp integrated circuits, Cirrus Logic has simplified the daunting task of amplifying low-level analog signals within scientific and industrial measurement applications.

The dual-channel CS3004 and CS3014 and single-channel CS3003 and CS3013 ICs deliver high accuracy, while the CS3013 and CS3014 also offer low power consumption. Low power usage is an important feature for new generations of battery-powered portable instruments and personal monitoring applications such as gas safety detectors.

Applications such as temperature/safety monitoring and industrial process controllers require not only minimal errors due to noise, leakage and drift but also extremely high gain to preserve measurement accuracy. According to the manufacturer, the CS300X family fulfils these requirements, with input leakage of only 100 pA and an input offset voltage of only 5 μV (CS3003/CS3013; 10 μV in the CS3004/CS3014) with drift of 0,05 μV/°C. Critical noise errors are limited to 17 nV per root-Hertz in the CS3003 and CS3004 (22 nV per root-Hertz in the CS3013/CS3014), which is held flat above 2 kHz bandwidth.

Accuracy in high-resolution measurement applications is ensured with a high open-loop gain performance of 150 dB in the CS3003/CS3004, while the low-power CS3013/14 provides 135 dB. Operating from single or bipolar power supplies of 2,7 V to 5 V (±1,35 V to ±2,5 V), consumption is an impressive 1000 μA per amplifier in the CS3003/CS3004 and only 500 μA each in the CS3013/CS3014.

In addition to the popular small-outline 8-pin QFN package, these devices will also be available in the new leadless 4 x 4 mm leadless QFN package.

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