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Zero-drift op amp uses 30% less power

Posted: 04 Aug 2009 ?? ?Print Version ?Bookmark and Share

Keywords:operational amplifier? op amp? ADC?

Analog Devices Inc. introduced a dual-channel, ultralow-power, zero-drift operational amplifier that uses 30 percent less power than competing products. A chopper-stabilized op amp designed for portable and battery-powered instruments requiring high DC precision and measurement stability, the compact ADA4051-2 is suited for gas analyzers, remote sensors, handheld medical devices and consumer gaming controllers.

The ADA4051-2 features a new chopper architecture with ADI's patent pending auto-correction feedback loop (ACFB) ripple-suppression technology to provide low offset voltage of 2?V (typ) and 15?V(max). This architecture enables temperature drift suppression to 20nV/C (typ) and eliminates 1/f noise. In addition, the ADA4051-2 provides rail-to-rail I/O, which helps provide high dynamic range greater than 110dB. The chopper architecture enables the device to achieve a high PSRR of 135db and common mode rejection ratio of 135db (typ). The ADA4051-2 amplifier provides a 125kHz gain-bandwidth product and draws only 17?A (max) which allows it to minimize power consumption and extend the operating time of battery-powered applications.

The ADA4051-2 CMOS high-precision op amp operates from a 1.8V to 5.5V single power supply and features rail-to-rail input and output swings to maximize ADC dynamic input range. The device is compatible with most ADCs currently available, including ADI's AD7942 14-bit, 250KSps PulSAR, pseudo differential ADC and AD7788/89/90/91 ultralow-power, Sigma Delta ADC family.

The product is available at $1.50 per 1,000 pieces. It measures 3mm x 3mm and comes in both 8-pin LFSCP and 8-pin MSOP packages.

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