±300°/sec Yaw Rate Gyro

ADXRS620

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 ADXRS620 is a complete angular rate sensor (gyroscope)

that uses the Analog Devices, Inc., surface-micromachining

process to create a functionally complete and low cost angular

rate sensor integrated with all required electronics on one chip.

The manufacturing technique for this device is the same high

volume BiMOS process that is used for high reliability automotive

airbag accelerometers.

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

proportional 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. An external capacitor sets 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 ADXRS620 is available in a 7 mm × 7 mm ×

3 mm BGA ceramic package.

FUNCTIONAL BLOCK DIAGRAM

PGND

AGND

ST2 ST1

TEMP

DEMOD

180kΩ ±1%

100nF

100nF

CP1 CP2 CP3 CP4 CP5

SUMJ

RATEOUT

22nF

100nF

22nF

100nF

DRIVE

AMP

MECHANICAL

SENSOR

+5V

+5V

+5V

CHARGE PUMP

AND VOLTAGE

REGULATOR

(ADC REF)

AC

AMP

VGA

25kΩ

@ 25°C

ADXRS620

25kΩ

SELF-TEST

Figure 1.