ADXRS401_15 Datasheet, PDF (1/12 Pages) Analog Devices – 75/s Single Chip Yaw Rate Gyro with Signal Conditioning

±75°/s Single Chip Yaw Rate
Gyro with Signal Conditioning
ADXRS401
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
Ultra small and light (< 0.15 cc, < 0.5 gram)
APPLICATIONS
GPS navigation systems
Image stabilization
Inertial measurement units
Platform stabilization
GENERAL DESCRIPTION
The ADXRS401 is a functionally complete and low cost angular
rate sensor (gyroscope), integrated with all of the required
electronics on one chip. It is manufactured using Analog
Devices’ surface-micromachining technique, the same high
volume BIMOS process used for high reliability automotive
airbag accelerometers. It is available in a 7 mm × 7 mm × 3 mm
BGA surface-mount package.
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 2). 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 1).
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.
ST1 5G
ST2 4G
FUNCTIONAL BLOCK DIAGRAM
+ _5V –
100nF
100nF
C_OUT
AVCC
3A
2G
AGND
1F
CMID
1D
SUMJ
1C
SELF
TEST
RATE
SENSOR
CORIOLIS SIGNAL CHANNEL
π DEMOD
R_SEN1
S_SEN2
≈9kΩ ±35% ≈9kΩ ±35%
RESONATOR LOOP
R_OUT
180kΩ 1%
1B
RATEOUT
2A
2.5V REF
1E 2.5V
12V
CHARGE PUMP/REG.
PTAT
3G TEMP
PDD
4A 5A
7E
6G
CP2
CP1
22nF
PGND
ADXRS401
100nF
7F
6A
7B 7C
7D
CP4 CP3 CP5
1µF
22nF
Figure 1.
Rev. 0
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