±300°/s Single Chip Yaw Rate
Gyro with Signal Conditioning

ADXRS300
FEATURES
Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
High vibration rejection over wide frequency
2000 g powered shock operation
Self-test on digital command
Temperature sensor output
Precision voltage reference output
Absolute rate output for precision applications
5 V single-supply operation
Ultrasmall and light (< 0.15 cc, < 0.5 gram)
APPLICATIONS
Vehicle chassis rollover sensing
Inertial measurement units
Platform stabilization
GENERAL DESCRIPTION
The ADXRS300 is a complete angular rate sensor (gyroscope)
that uses Analog Devices’ 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 vol-
ume BIMOS process used for high reliability automotive airbag
accelerometers.
The output signal, RATEOUT (1B, 2A), is a voltage proportional
to angular rate about the axis normal to the top surface of the
package (see Figure 3). 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
(see Figure 4).
A precision reference and a temperature output are also pro-
vided for compensation techniques. Two digital self-test inputs
electromechanically excite the sensor to test proper operation of
both sensors and the signal conditioning circuits. The
ADXRS300 is available in a 7 mm × 7 mm × 3 mm BGA
chip-scale package.

FUNCTIONAL BLOCK DIAGRAM
5G
4G
3A
5V
2G 1F
7F 6A 7D7C7B
1C
4A 5A 7E 6G
1D
2A
1E
3G
1B
PDD
12V
+
ADXRS300
47nF
22nF
100nF
22nF
CP2 CP1 PGND CP4 CP3 CP5
CHARGE PUMP/REG.
TEMP
PTAT
RATEOUT
2.5V
π DEMOD
RATE
SENSOR
SELF
TEST
100nF 100nF
CMIDAGNDAVCC
ST1
ST2
CORIOLIS SIGNAL CHANNEL
R
SEN1
R
SEN2
C
OUT
SUMJ
R
OUT
2.5V REF
≈7kΩ ±35% ≈7kΩ ±35%
180kΩ 1%
RESONATOR LOOP
–

Figure 1.

Rev. A
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