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ADXRS642 Datasheet(Arkusz danych) 8 Page - Analog Devices

Numer części ADXRS642
Szczegółowy opis  Vibration Rejecting ±250°/s Yaw Rate Gyro
Pobierz  10 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADXRS642
Preliminary Technical Data
Rev. Pr. A | Page 8 of 10
NULL ADJUSTMENT
The nominal 2.5 V null is for a symmetrical swing range at
RATEOUT (1B, 2A). However, a nonsymmetric output swing
may be suitable in some applications. Null adjustment is possible
by injecting a suitable current to SUMJ (1C, 2C). Note that supply
disturbances may reflect some null instability. Digital supply noise
should be avoided, particularly in this case.
SELF-TEST FUNCTION
The ADXRS642 includes a self-test feature that actuates each of
the sensing structures and associated electronics in the same
manner, as if subjected to angular rate. It is activated by standard
logic high levels applied to Input ST1 (5F, 5G), Input ST2
(4F, 4G), or both. ST1 causes the voltage at RATEOUT to change
about −0.3 V, and ST2 causes an opposite change of +0.3 V. The
self-test response follows the viscosity temperature dependence
of the package atmosphere, approximately 0.25%/°C.
Activating both ST1 and ST2 simultaneously is not damaging.
ST1 and ST2 are fairly closely matched (±2%), but actuating
both simultaneously may result in a small apparent null bias
shift proportional to the degree of self-test mismatch.
ST1 and ST2 are activated by applying a voltage equal to VRATIO
to the ST1 pin and the ST2 pin. The voltage applied to ST1 and
ST2 must never be greater than AVCC.
CONTINUOUS SELF-TEST
The on-chip integration of the ADXRS642 gives it higher reliability
than is obtainable with any other high volume manufacturing
method. Also, it is manufactured under a mature BiMOS process
that has field-proven reliability. As an additional failure detection
measure, power-on self-test can be performed. However, some
applications may warrant continuous self-test while sensing rate.
Details outlining continuous self-test techniques are also
available in the AN-768 Application Note.
MECHANICAL PERFORMANCE
The ADXRS642 excellent vibration rejection is demonstrated in
the graphs below. Figure 6 shows the ADXRS642 output
response with and without 15g RMS 50Hz to 5kHz of random
vibration. Bandwidth of the gyro was limited to 1600Hz.
Performance is similar regardless of the direction of input
vibration.
Figure 6. ADXRS642 Output Response With and Without Random Vibration
(15g RMS, 50Hz to 5kHz)
Figure 7 demonstrates the ADXRS642 DC bias response to 5g
Sine vibration over the 20Hz to 5kHz range. As can be seen,
there are no sensitive frequencies present and vibration
rectification is vanishingly small. As in the previous example
gyro bandwidth was set to 1600Hz.
Figure 7. ADXRS642 Sine Vibration Output Response (5g, 20Hz to 5kHz)
0.00001
0.0001
0.001
0.01
0.1
1
10
100
1000
10000
Frequency
‐0.04
‐0.02
0
0.02
0.04
0.06
0.08
0.1
0.12
10
100
1000
10000
Hz




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