ADXRS290 ADI First Pitch and Roll Gyro

The World Leader in High Performance Signal Processing Solutions
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Consumer
Grade Devices typically excel on two items:
Noise and Price
Consumer
Devices typically are poor at,or do not specify,many
specifications critical to complex motion analysis:
Stability,g-effect,Tempco’s,Alignment,Linearity,etc
Most
Industrial Grade Suppliers Position their product solely on inrun bias stability
… because their other specifications are less attractive
The
‘other’specifications are typically larger error sources,and thus
more important
in-run bias is a ‘theoretical’spec
Reallife Performance is only understood after looking at a Composite
Spec Analysis
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Degrees ofFreedom (DoF)
Gyro in-run bias stability
10: 3 axis gyro,3 axis accel,3 axis magnetometer,1 barometer
9: 3 axis gyro,3 axis accel,3 axis magnetometer
6: 3 axis gyro,3 axis accel
4: 1 axis gyro,3 axis accel
Theoretical best possible estimate ofthe devices (residual)offset
Allan Variance: industry standard method to determine in-run bias (a 25C spec)
Orthogonality
Axial alignment ofthe individual sensors within the IMU
Static versus Dynamic Acceleration
Linear Acceleration Effect (Vibration Effect),on a gyro
Kalman Filter
Influence ofrandom vibration, gravity,and other real-world motion,on the gyro bias
System Algorithms which,via application-aware weighting ofvarious input sensors,cross-correlates/corrects the
sensors and helps determine best estimate ofposition/track
Calibration/Compensation
Sensor’s have unique device-specific calibration;capturing 100’s ofcal points which are stored in the device;the
actual Compensation (for temp drift/linear-accel drifts)is done automatically,within the Sensor,real-time.
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W hat
do customers value the most?
Depends on the application,certainly,but in general:
Null stability/Drift
Over temperature
Over ti
me
Shock and Vibration immunity
Noise Density
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Li
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Temperature range
Tol
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Measurement range
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Cost
Superi
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brati
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tyfor Harsh Envi
ronments
-40°C to +105°C Industri
alTemp Range & Hermeti
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Hi
gh performance specsshown:Bi
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FEATURES
Pi
tch and rol
lrate response (100 and
1200 °/s ful
l
-scal
e ranges)
Ul
tra l
ow noi
se:0.004o/s/Hz
Hi
gh vi
brati
on rej
ecti
on over a wi
de
frequency range
Power savi
ng standby mode
80 µA standby current
Fast startup from standby to measurement
mode (<50ms)
Low del
ay of<0.5 ms for a 30 Hzinput at
the wi
dest bandwi
dth setti
ng
16bi
t ADC wi
th 0.005 °/s/LSB sensi
ti
vi
ty
I
ntegrated di
gi
talhi
gh and l
ow pass fi
l
ters
wi
th sel
ectabl
e pol
es
2000 g powered shock survi
vabi
l
i
ty
2.
7 V to 5.25 V and −25°C to 85°C operati
on
4.
5 × 5.8 × 1.2 mm cavi
tyl
ami
nate package
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1.Rotation
motion is dominant in
hand shake
motion has more effect
in the picture blur than linear
motion (when the distance from
the object is much longer than
focal length)
Axis
2.Rotation
Selling points:
a. Low noise
b. Small package
c. Low power consumption
Yaw
Vertical
Horizontal
Roll
3.
Back and Forth
Pitch
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Two
wheel vehicle
ToyUAV /Aer
ial
photography
Ant
enna stabilization…
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Domest
ic
robot
Pr
oj
ector
Navigat
or…