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ADXRS646 Folha de dados(PDF) 11 Page - Analog Devices |
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ADXRS646 Folha de dados(HTML) 11 Page - Analog Devices |
11 / 12 page Data Sheet ADXRS646 Rev. 0 | Page 11 of 12 IMMUNITY TO VIBRATION Gyroscopes are designed to respond only to rotation. However, all gyroscopes respond to linear motion as well, to varying degrees. While bias stability is often used as the primary figure of merit for evaluating high performance gyroscopes, many additional error sources are present in real-world applications. Especially in applications that require motion sensors, vibration and acceleration are present, and the resulting errors often overwhelm bias drift. Its differential, quad-sensor design makes the ADXRS646 inherently resistant to vibration, without the need for compensation. The excellent vibration immunity of the ADXRS646 is demonstrated in Figure 21 and Figure 22. Figure 21 shows the ADXRS646 output response with and without random 15 g rms vibration applied at 20 Hz to 2 kHz. Performance is similar regardless of the direction of input vibration. Figure 21. ADXRS646 Output Response With and Without Random Vibration (15 g RMS, 20 Hz to 2 kHz); Gyroscope Bandwidth Set to 1600 Hz To further improve immunity to vibration and acceleration, some g-sensitivity compensation can be performed using an accelerometer. This technique is most successful when the response to vibration is constant regardless of vibration frequency. Figure 22 demonstrates the ADXRS646 dc bias response to a 5 g sinusoidal vibration over the 20 Hz to 5 kHz range. This figure shows that there are no sensitive frequencies present and that vibration rectification is vanishingly small. Accordingly, g-sensitivity compensation using an accelerometer is possible where needed, but the inherent device performance is sufficient for many applications. Figure 22. ADXRS646 Sine Vibration Output Response (5 g, 20 Hz to 5 kHz); Gyroscope Bandwidth Set to 1600 Hz 1 0.1 0.01 0.001 0.0001 0.00001 FREQUENCY (Hz) 10 100 1k 10k WITH VIBRATION NO VIBRATION 0.12 –0.04 –0.02 0 0.02 0.04 0.06 0.08 0.10 FREQUENCY (Hz) 10 100 1k 10k |
Nº de peça semelhante - ADXRS646 |
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Descrição semelhante - ADXRS646 |
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