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ADXRS450BRGZ Fiches technique(PDF) 10 Page - Analog Devices

No de pièce ADXRS450BRGZ
Description  HIgh Performance, Digital Output Gyroscope
Download  28 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADXRS450BRGZ Fiches technique(HTML) 10 Page - Analog Devices

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ADXRS450
Preliminary Technical Data
Rev. PrA | Page 10 of 28
APPLICATIONS INFORMATION
CALIBRATED PERFORMANCE
Each ADXRS450 gyroscope uses internal EEPROM memory to
store its temperature calibration information. The calibration
information is encoded into the device during factory test. The
calibration data is used to perform offset, gain, and self-test
corrections over temperature. By storing this information
internally, it removes the burden from the customer of
performing system level temperature calibration.
MECHANICAL CONSIDERATIONS FOR MOUNTING
Mount the ADXRS450 in a location close to a hard mounting
point of the PCB to the case. Mounting the ADXRS450 at an
unsupported PCB location (that is, at the end of a lever, or in
the middle of a trampoline), as shown in Figure 20, can result in
apparent measurement errors, as the gyroscope is subject to the
resonant vibration of the PCB. Locating the gyroscope near a
hard mounting point helps to ensure that any PCB resonances
at the gyroscope are above the frequency at which harmful
aliasing with the internal electronics can occur. To ensure that
aliased signals do not couple into the baseband measurement
range, design the module wherein the first system level
resonance occurs at a frequency higher than 800 Hz.
MOUNTING POINTS
PCB
GYROSCOPE
Figure 20. Incorrectly Placed Gyroscope
APPLICATIONS CIRCUITS
Figure 21 and Figure 22 show the recommended application
circuits for the ADXRS450 gyroscope. These application circuits
provide a connection reference for the available package types.
Note that DVDD, AVDD, and PDD are all individually connected to
ground through 1 μF capacitors; do not connect these supplies
together. Additionally, an external diode and inductor must be
connected for proper operation of the internal shunt regulator.
These components allow for the internal resonator drive voltage
to reach its required level, as listed in the Specifications section.
Table 6.
Component
Qty
Description
Inductor
1
470 μH
Diode
1
>24 V breakdown voltage
Capacitor
3
1 μF
Capacitor
1
100 nF
116
DVDD
RSVD
RSVD
CS
MISO
PDD
VX
PSS
SCLK
MOSI
AVDD
DVSS
RSVD
AVSS
CP5
RSVD
100nF
1µF
1µF
3.3V TO 5V
1µF
DIODE
>24V BREAKDOWN
470µH
GND
GND
GND
Figure 21. Recommended Applications Circuit, SOIC_CAV Package
AVSS
AVDD
MISO
DVDD
SCLK
CP5
RSVD
PDD
PSS
MOSI
DVSS
VX
RSVD
1µF
1µF
1µF
100nF
3.3V TO 5V
DIODE
>24V BREAKDOWN
GND
GND
470µH
GND
114
TOP VIEW
CS
Figure 22. Recommended Applications Circuit, Ceramic LCC_V Package
ADXRS450 SIGNAL CHAIN TIMING
The ADXRS450 primary signal chain is shown in Figure 23. It is
the series of necessary functional circuit blocks through which
the rate data is generated and processed. This sequence of electro-
mechanical elements determines how quickly the device is capable
of translating an external rate input stimulus into an SPI word
to be sent to the master device. The group delay, which is a func-
tion of the filter characteristic, is the time required for the output
of the low-pass filter to be within 10% of the external rate input,
and is seen to be ~4 ms. Additional delay can be observed due
to the timing of SPI transactions and the population of the rate
data into the internal device registers. Figure 23 anatomizes this
delay, wherein the delay through each element of the signal chain
is presented.


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