Fast Starting, ±20,000°/sec

Vibration Rejecting Rate Gyro

Data Sheet

ADXRS649

Rev. B

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FEATURES

High vibration rejection over wide frequency

Ultrafast startup: 3 ms

Measurement range extendable to ±50,000°/sec

10,000 g powered shock survivability

Ratiometric to referenced supply

5 V single-supply operation

Z-axis (yaw rate) response

−40°C to +105°C operation

Self-test on digital command

Ultrasmall and light (<0.15 cc, <0.5 gram)

Temperature sensor output

RoHS compliant

APPLICATIONS

Sports equipment

Industrial applications

Platform stabilization

High speed tachometry

GENERAL DESCRIPTION

The ADXRS649 is a complete angular rate sensor (gyroscope)

that uses the Analog Devices, Inc., patented high volume BiMOS

surface-micromachining process to make a complete gyro on

one chip. An advanced, differential, quad sensor design rejects

the influence of linear acceleration, enabling the ADXRS649

to offer rate sensing in harsh environments where shock and

vibration are present.

The output signal, RATEOUT (B1, A2), is a voltage proportional

to the angular rate about the axis normal to the top surface of

the package. The output is ratiometric with respect to a provided

reference supply. An external capacitor is used to set the band-

width. The measurement range is extendable to ±50,000°/sec

by adding an external resistor.

Low power consumption (3.5 mA) enables very low power

consumption, and ultrafast startup (3 ms) allows for quick

power cycling of the gyro. At 10 samples per second, a pair of

CR2032 coin cells can power the ADXRS649 for three months.

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 condi-

tioning circuits. The ADXRS649 is available in a 7 mm × 7 mm ×

3 mm CBGA chip scale package.

FUNCTIONAL BLOCK DIAGRAM

AGND

PGND

ST2

ST1

TEMP

CP1

CP2

CP3

CP4

CP5

SUMJ

RATEOUT

DEMOD

180k

Ω ±1%

22nF

2.2nF

22nF

100nF

100nF

100nF

DRIVE

AMP

MECHANICAL

SENSOR

CHARGE PUMP

AND VOLTAGE

REGULATOR

5V

5V

5V

(ADC REF)

AC

AMP

VGA

25k

Ω

AT 25°C

ADXRS649

25k

Ω

SELF-TEST

Figure 1.