±250°/sec Yaw Rate Gyro

ADXRS612

Rev. 0

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FEATURES

Complete rate gyroscope on a single chip

Z-axis (yaw rate) response

High vibration rejection over wide frequency

2000 g powered shock survivability

Ratiometric to referenced supply

5 V single-supply operation

105

°C operation

Self-test on digital command

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

Temperature sensor output

RoHS compliant

APPLICATIONS

Vehicle chassis rollover sensing

Inertial measurement units

Platform stabilization

GENERAL DESCRIPTION

The ADXRS612 is a complete angular rate sensor (gyroscope)

that uses the Analog Devices, Inc. surface-micromachining

process to make a functionally complete and low cost angular

rate sensor integrated with all of the required electronics on one

chip. The manufacturing technique for this device is the same

high volume BIMOS process used for high reliability automotive

airbag accelerometers.

The output signal, RATEOUT (1B, 2A), is a voltage propor-

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

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

reference supply. A single external resistor can be used to lower

the scale factor. An external capacitor is used to set the bandwidth.

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 condi-

tioning circuits. The ADXRS612 is available in a 7 mm × 7 mm ×

3 mm BGA chip-scale package.

FUNCTIONAL BLOCK DIAGRAM

AGND

PGND

ST2 ST1

TEMP

CP1 CP2 CP3 CP4 CP5

SUMJ

RATEOUT

DEMOD

180kΩ ±1%

22nF

100nF

22nF

100nF

100nF

100nF

DRIVE

AMP

MECHANICAL

SENSOR

CHARGE PUMP

AND VOLTAGE

REGULATOR

+5V

+5V

+5V

(ADC REF)

AC

AMP

VGA

25kΩ

@ 25°C

ADXRS612

25kΩ

SELF-TEST

Figure 1.