High Stability, Low Noise Vibration Rejecting Yaw Rate Gyroscope

The ADXRS646 is a high performance angular rate sensor (gyroscope) that offers excellent vibration immunity. Bias stability is a widely-recognized figure of merit for high performance gyroscopes, but in real-world applications, vibration sensitivity is often a more significant performance limitation and should be considered in gyroscope selection. The ADXRS646 offers superior vibration immunity and acceleration rejection as well as a low bias drift of 12°/hr (typical), enabling it to offer rate sensing in harsh environments where shock and vibration are present.

The ADXRS646 is manufactured using the Analog Devices, Inc., patented high volume BiMOS surface-micromachining process. An advanced, differential, quad sensor design provides the improved acceleration and vibration rejection. The output signal, RATEOUT, is a voltage proportional to angular rate about the axis normal to the top surface of the package. The measurement range is a minimum of ±250°/sec. The output is ratiometric with respect to a provided reference supply. Other external capacitors are required for operation.

A temperature output is provided for compensation techniques. Two digital self-test inputs electromechanically excite the sensor to test proper operation of both the sensor and the signal conditioning circuits.

The ADXRS646 is available in a 7 mm × 7 mm × 3 mm CBGA chip-scale package.

APPLICATIONS

* Industrial applications

* Severe mechanical environments

* Platform stabilization

* Complete rate gyroscope on a single chip

* Z-axis (yaw rate) response

* 12°/hour bias stability

* 0.01°/√second angle random walk

* High vibration rejection over wide frequency

* Measurement range extendable to a maximum of ±450°/sec

* 10,000 g powered shock survivability

* Ratiometric to referenced supply

* 6 V single-supply operation

* See data sheet for additional features