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ADXRS300ABG
Angular Rate Sensor ADXRS300
±300°/s Single Chip Yaw Rate
Gyro with Signal Conditioning
FEATURES
Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
High vibration rejection over wide frequency
2000 g powered shock survivability
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
volume 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 4). 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 5).
A precision reference and a temperature output are also
provided 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 Figure 1.
Rev. B
TABLE OF CONTENTS Specifications.....................................................................................3
Absolute Maximum Ratings............................................................4
Rate Sensitive Axis........................................................................4
ESD Caution..................................................................................4
Pin Configuration and Function Descriptions.............................5
Theory of Operation........................................................................6
Supply and Common Considerations.......................................6
Setting Bandwidth........................................................................7
Increasing Measurement Range..................................................7
Using the ADXRS300 with a Supply-Ratiometric ADC..........7
Null Adjust.....................................................................................7
Self-Test Function.........................................................................7
Continuous Self-Test.....................................................................7
Outline Dimensions..........................................................................8
Ordering Guide.............................................................................8
REVISION HISTORY
3/04—Data Sheet Changed from Rev. A to Rev. B Updated Format..................................................................Universal
Changes to Table 1 Conditions.......................................................3
Added Evaluation Board to Ordering Guide................................8
3/03—Data Sheet Changed from Rev. 0 to Rev. A Edit to Figure 3..................................................................................5
SPECIFICATIONS @TA = 25°C, VS = 5 V, Angular Rate = 0°/s, Bandwidth = 80 Hz (COUT = 0.01 µF), ±1g, unless otherwise noted.
Table 1. 1 All minimum and maximum specifications are guaranteed. Typical specifications are not tested or guaranteed. Dynamic range is the maximum full-scale measurement range possible, including output swing range, initial offset, sensitivity, offset drift, and sensitivity drift at
5 V supplies. Specification refers to the maximum extent of this parameter as a worst-case value of TMIN or TMAX.
4 Frequency at which response is 3 dB down from dc response with specified compensation capacitor value. Internal pole forming resistor is 180 kΩ. See the Setting
ABSOLUTE MAXIMUM RATINGS
Table 2. Stresses above those listed under the Absolute Maximum
Ratings may cause permanent damage to the device. This is a
stress rating only; functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Applications requiring more than 200 cycles to MIL-STD-883
Method 1010 Condition B (–55°C to +125°C) require underfill
or other means to achieve this requirement.
Drops onto hard surfaces can cause shocks of greater than
2000 g and exceed the absolute maximum rating of the device.
Care should be exercised in handling to avoid damage.
RATE SENSITIVE AXIS This is a Z-axis rate-sensing device that is also called a yaw rate
sensing device. It produces a positive going output voltage for
clockwise rotation about the axis normal to the package top, i.e.,
clockwise when looking down at the package lid.
Figure 2. RATEOUT Signal Increases with Clockwise Rotation
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 3. 32-Lead BGA (Bottom View)
Table 3. Pin Function Descriptions THEORY OF OPERATION The ADXRS300 operates on the principle of a resonator gyro.
Two polysilicon sensing structures each contain a dither frame,
which is electrostatically driven to resonance. This produces the
necessary velocity element to produce a Coriolis force during
angular rate. At two of the outer extremes of each frame,
orthogonal to the dither motion, are movable fingers that are
placed between fixed pickoff fingers to form a capacitive pickoff
structure that senses Coriolis motion. The resulting signal is fed
to a series of gain and demodulation stages that produce the
electrical rate signal output. The dual-sensor design rejects
external g-forces and vibration. Fabricating the sensor with the
signal conditioning electronics preserves signal integrity in
noisy environments.
The electrostatic resonator requires 14 V to 16 V for operation.
Since only 5 V is typically available in most applications, a
charge pump is included on-chip. If an external 14 V to 16 V
supply is available, the two capacitors on CP1–CP4 can be
omitted and this supply can be connected to CP5 (Pin 7D) with
a 100 nF decoupling capacitor in place of the 47 nF.
After the demodulation stage, there is a single-pole low-pass
filter consisting of an internal 7 kΩ resistor (RSEN1) and an
external user-supplied capacitor (CMID). A CMID capacitor of
100 nF sets a 400 Hz ±3 5% low-pass pole and is used to limit
high frequency artifacts before final amplification. The band-
width limit capacitor, COUT, sets the pass bandwidth (see Figure 5
and the Setting Bandwidth section).
SUPPLY AND COMMON CONSIDERATIONS Only power supplies used for supplying analog circuits are
recommended for powering the ADXRS300. High frequency
noise and transients associated with digital circuit supplies may
have adverse effects on device operation.
Figure 4 shows the recommended connections for the ADXRS300
where both AVCC and PDD have a separate decoupling capacitor.
These should be placed as close to the their respective pins as
possible before routing to the system analog supply. This mini-
mizes the noise injected by the charge pump that uses the PDD
supply.
It is also recommended to place the charge pump capacitors
connected to the CP1–CP4 pins as close to the part as possible.
These capacitors are used to produce the on-chip high voltage
supply switched at the dither frequency at approximately
14 kHz. Care should be taken to ensure that there is no more
than 50 pF of stray capacitance between CP1–CP4 and ground.
Surface-mount chip capacitors are suitable as long as they are
rated for over 15 V.
100nFFigure 5. Block Diagram with External Components
