MEMS Digital Gyroscope with Higher Rate Sensing Accuracy

Analog Devices (ADI) introduced the ADXRS453 iMEMS gyroscope, the latest addition to ADI’s portfolio of fourth-generation high-performance, low-power gyroscopes with digital output.

Specifically designed for angular rate (rotational) sensing in harsh environments, the new gyro features an advanced, differential Quad-Sensor design that enables it to operate accurately under intense shock and vibration conditions. The ADXRS453 is the most stable, vibration-immune MEMS gyro available, with sensitivity to linear acceleration specified at only 0.01 °/sec/g, vibration rectification of only 0.0002 °/sec/g2, a noise-rate density specification of 0.023°/sec/√Hz at +105°C, null offset stability of 16°/hr and power consumption of only 6 milliamps under typical conditions.

The new gyro is available in a cavity plastic SOIC-16 and an SMT-compatible vertical mount package and is capable of operating across a wide voltage range of 3.3 V to 5 V and an extended temperature range of -40°C to 125°C. The ADXRS453 is well suited for industrial and defence applications.

 “The ADXRS453 features an innovative Quad-Sensor™ design that rejects the influence of linear acceleration caused by intense shock and vibration,” said Kelly Atkinson, defence electronics marketing manager, Analog Devices. “This enables the ADXRS453 to enable complex navigation and GPS-aided dead-reckoning in exceedingly harsh environments like unmanned aerial vehicles (UAVs), platform stabilization in land- and sea-based military vehicles, and avionics equipment where shock and vibration are present and can cause measurement errors in less capable gyros.” 

The digital output ADXRS453 is capable of sensing angular rates up to ±300°/sec and its angular rate data is presented as a 16-bit word within a 32-bit serial peripheral interface (SPI) message.  The ADXRS453 utilizes an internal, continuous self-test architecture. The integrity of the electromechanical system is checked by applying a high frequency electrostatic force to the sense structure to generate a rate signal that can be differentiated from the baseband rate data and internally analyzed.

“No other MEMS gyroscope is able to perform at this level under these conditions,” said Wayne Meyer, inertial MEMS sensor marketing and applications manager, Analog Devices. “With robust performance and operation up to +125°C temperature, this MEMS gyroscope provides industry leading stability and vibration immunity for all kinds of demanding applications.” 

Key Features and Benefits
• -40° C to +125° C operation is suitable for harsh defence environments.
• Ultra-high vibration rejection of 0.01°/s/g provides very accurate angular rate measurements
• Excellent 16°/hr null offset stability virtually eliminates drift for greater accuracy
• 2,000-g powered shock survivability delivers greater reliability.
• Low power consumption addresses lower power budget demands

The high-performance ADXRS453 and ADXRS450 iMEMS gyroscopes are available today in sample quantities with production release scheduled for December 2010. The ADXRS453 comes in a small 16-lead plastic SOIC package and an SMT-compatible ceramic vertical-mount package; each is priced at $48.24 per unit and $62.29 per unit, respectively, in 1,000-unit quantities.

www.analog.com


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