Zero-drift, low-power op-amp

2 September 2009 Analogue, Mixed Signal, LSI

Analog Devices has unveiled a dual-channel, low-power, zero-drift operational amplifier designed for applications such as gas analysers, remote sensors, handheld medical devices and consumer gaming controllers. The compact ADA4051-2 is a chopper-stabilised op-amp designed for portable and battery-powered instruments requiring high DC precision and measurement stability. The op-amp features a new chopper architecture with ripple suppression technology to provide offset voltage of 15 μV maximum. This enables temperature drift suppression to 20 nV/°C and eliminates 1/f noise. In addition, the ADA4051-2 provides rail-to-rail I/O, which helps provide high dynamic range. The chopper architecture enables the device to achieve PSRR and CMRR figures of 135 db. The amplifier provides a 125 kHz gain-bandwidth product and draws only 17 μA.

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