ADI unveils quad sensor mems gyroscopes

The ADXRS642, ADXRS646, and ADXRS649 incorporate ADI's advanced, differential quad sensor technology, which it claims rejects the influence of linear acceleration and vibration to enable the gyros to offer 'exceptionally' accurate and reliable rate sensing, even where severe shock and vibration are present. "These new mems gyros have linear acceleration sensitivities as low as 0.015°/sec/g compared to 0.1°/sec/g offered by the leading alternative," said Wayne Meyer, marketing and applications manager, mems/sensors technology group, ADI. "The ADXRS64x series also offers much faster start up times, as fast as 3ms, and 10 times lower power consumption at 3.5mA compared to other mems gyros that consume as much as 60mA." For applications where ultra wide measurement ranges are needed, Meyer claims the ADXRS649 offers the highest rate of rotation sensing available with ±20,000°/sec and fast 3ms start up time for quick power cycling. According to the company, this measurement range is extendable to ±50,000°/sec with the addition of an external resistor. The ADXRS646 gyro offers a measurement range of ±250°/s, 1kHz bandwidth and 8°/hr drift with low broadband noise. It has a low g sensitivity of 0.015°/s/g and vibration rectification of 0.0001°/s/g², making it suitable for high performance heading measurement and platform stabilisation.