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ADXL362BCCZ-R2 Arkusz danych(PDF) 14 Page - Analog Devices |
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ADXL362BCCZ-R2 Arkusz danych(HTML) 14 Page - Analog Devices |
14 / 44 page ADXL362 Data Sheet Rev. B | Page 14 of 44 Current consumption varies somewhat with output data rate as shown in Figure 30, remaining below 5.0 µA over the entire range of data rates and operating voltages. 6 5 4 3 2 1 0 OUTPUT DATA RATE (Hz) 0 100 200 300 400 VS = 1.6V VS = 2.0V VS = 2.5V VS = 3.0V VS = 3.5V Figure 30. Current Consumption vs. Output Data Rate at Several Supply Voltages Antialiasing The analog-to-digital converter (ADC) of the ADXL362 samples at the (user selected) output data rate. In the absence of anti- aliasing filtering, it aliases any input signals whose frequency is more than half the data rate. To mitigate this, a two-pole low- pass filter is provided at the input of the ADC. The user can set this antialiasing filter to a bandwidth that is at ½ the data rate or ¼ the data rate. Setting the antialiasing filter pole to ½ of the output data rate provides less aggressive antialiasing filtering, but maximizes bandwidth and is adequate for most applications. Setting the pole to ¼ of the data rate reduces bandwidth for a given data rate, but provides more aggressive antialiasing. The antialiasing filter of the ADXL362 defaults to the more conservative setting, where bandwidth is set to one-fourth the output data rate. POWER/NOISE TRADEOFF The ADXL362 offers a few options for decreasing noise at the expense of only a small increase in current consumption. The noise performance of the ADXL362 in normal operation, typically 7 LSB rms at 100 Hz bandwidth, is adequate for most applications, depending upon bandwidth and the desired reso- lution. For cases where lower noise is needed, the ADXL362 provides two lower noise operating modes that trade reduced noise for a somewhat higher current consumption. Table 7 lists the current consumption and noise densities obtained for normal operation and the two lower noise modes at a typical 2.0 V supply. Table 7. Noise and Current Consumption: Normal Operation, Low Noise Mode, and Ultralow Noise Mode @ VS = 2.0 V, ODR = 100 Hz Mode Noise (µg/√Hz) Typical Current Consumption (µA) Typical Normal Operation 550 1.8 Low Noise 400 3.3 Ultralow Noise 250 13 Operating the ADXL362 at a higher supply voltage also decreases noise. Table 8 lists the current consumption and noise densities obtained for normal operation and the two lower noise modes at the highest recommended supply, 3.3 V. Table 8. Noise and Current Consumption: Normal Operation, Low Noise Mode, and Ultralow Noise Mode @ VS = 3.3 V, ODR = 100 Hz Mode Noise (µg/√Hz) Typical Current Consumption (µA) Typical Normal Operation 380 2.7 Low Noise 280 4.5 Ultralow Noise 175 15 |
Podobny numer części - ADXL362BCCZ-R2 |
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Podobny opis - ADXL362BCCZ-R2 |
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