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MEMS gyro handles intense shock, vibration

Posted: 13 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:MEMS? gyroscope? sensor?

ADXRS450 i MEMS gyroscope

Analog Devices Inc. has developed the high-performance, low-power ADXRS450 i MEMS gyroscope with digital output specifically for angular rate (rotational) sensing in harsh environment.

The fourth-generation device features an advanced, differential quad-sensor design that enables it to operate accurately under intense shock and vibration conditions. No other MEMS gyroscope is able to perform at this level under these conditions. With robust performance and operating on low power of only 6mA, this MEMS gyroscope is effective for diverse applications, such as robotics, industrial instrumentation, avionics and platform stabilization for high-speed trains.

"Our customers rely on the Analog Devices iMEMS brand for the high performance and reliability they receive from our motion sensing products that combine innovative MEMS sensor design with ADI's leading analog signal conditioning circuitry for the optimum sensing solution," said Mark Martin, VP, MEMS and sensors technology group, ADI. "The ADXRS450 iMEMS gyroscope is a complete angular rate gyroscope in a single package and is the first device in a new class of high-performance MEMS gyros from ADI that feature an innovative differential quad-sensor design."

The new quad-sensor design rejects the influence of linear acceleration, enabling the ADXRS450 to operate in exceedingly harsh environments where shock and vibration are present and can cause measurement errors in less capable gyros. The ADXRS450 is the most stable, vibration-immune MEMS gyro available, with sensitivity to linear acceleration specified at only 0.03/sec/g, acceleration rectification of only 0.003/sec/g2, a noise-rate density specification of 0.020/sec/Hz, and power consumption of only 6mA under typical conditions. Other features include internal temperature compensation over an extended industrial temperature range and an optional ceramic vertical-mount package that uniquely enables three-axis sensing on a single PCB without daughterboards.

Martin added, "MEMS gyroscopes have long been the most difficult MEMS device to design and manufacture, particularly at the high-performance and low power consumption levels required in many emerging industrial automation and instrument applications. When compared to other high-performance MEMS gyros available, our new iMEMS gyros consume only one tenth the power of competing products and provide greater stability and vibration immunity."

The ADXRS450 high-performance angular rate gyroscope is capable of sensing angular rates up to 300/sec. Angular rate data is presented as a 16bit word, as part of a 32bit SPI message. The ADXRS450 is available in a cavity plastic SOIC-16 and an SMT-compatible vertical mount package and is capable of operating across both a wide voltage range (3.3V to 5V) and temperature range (-40C to 105C).

The gyroscope features high vibration rejection over a wide frequency range that allows for stable readings in harsh environments. Internal temperature compensation enables greater stability over extended industrial temp range, while the 2,000-g powered shock survivability delivers greater reliability.

The high-performance ADXRS450 iMEMS gyroscope is sampling today with volume production scheduled for December. The ADXRS450 comes in a small 16-lead plastic SOIC package and an SMT-compatible ceramic vertical- mount package; each is priced at $43.16 per unit and $57.07 per unit, respectively, in 1,000-unit quantities.

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