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ADXL250AQC bảng dữ liệu(PDF) 11 Page - Analog Devices |
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ADXL250AQC bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 15 page ADXL150/ADXL250 –11– REV. 0 2-POLE FILTER R2 42.2k R3 82.5k R1 82.5k +VS 200k 0 g TRIM R6 1M R5 R4 100k OUTPUT SCALING AMPLIFIER BW C3 C4 TYPICAL FILTER VALUES 300Hz 0.027 F 0.0033 F 100Hz 0.082 F 0.01 F 30Hz 0.27 F 0.033 F 10Hz 0.82 F 0.1 F +VS 0.1 F C2 0.1 F +VS 2 SELF-TEST +VS 2 25k 5k ADXL150 GAIN AMP OFFSET NULL COM C1 0.1 F BUFFER AMP DEMODULATOR SENSOR +VS TP (DO NOT CONNECT) 14 9 10 7 5 CLOCK 1/2 OP296 3 1 2 8 8 EXT AMP GAIN R5 VALUE F.S. RANGE DESIRED OUTPUT SCALE FACTOR 76mV/ g ±25 g 2.0 200k 100mV/ g ±20 g 2.6 261k 200mV/ g ±10 g 5.3 536k 400mV/ g ±5 g 10.5 1M C3 C4 +VS 2 1/2 OP296 5 4 7 6 Figure 21. Two-Pole Post Filter Circuit for various full-scale g levels and approximate circuit band- widths. For bandwidths other than those listed, use the formula: Cf = 1 2 π R3 () Desired 3dB Bandwidth in Hz or simply scale the value of capacitor Cf accordingly; i.e., for an application with a 50 Hz bandwidth, the value of Cf will need to be twice as large as its 100 Hz value. If further noise reduc- tion is needed while maintaining the maximum possible band- width, a 2- or 3-pole post filter is recommended. These provide a much steeper roll-off of noise above the pole frequency. Fig- ure 21 shows a circuit that provides 2-pole post filtering. Com- ponent values for the 2-pole filter were selected to operate the first op amp at unity gain. Capacitors C3 and C4 were chosen to provide 3 dB bandwidths of 10 Hz, 30 Hz, 100 Hz and 300 Hz. The second op amp offsets and scales the output to provide a +2.5 V ± 2 V output over a wide range of full-scale g levels. APPLICATION HINTS ADXL250 Power Supply Pins When wiring the ADXL250, be sure to connect BOTH power supply terminals, Pins 14 and 13. Ratiometric Operation Ratiometric operation means that the circuit uses the power supply as its voltage reference. If the supply voltage varies, the accelerometer and the other circuit components (such as an ADC, etc.) track each other and compensate for the change. Figure 22 shows how both the zero g offset and output sensitiv- ity of the ADXL150/ADXL250 vary with changes in supply voltage. If they are to be used with nonratiometric devices, such as an ADC with a built-in 5 V reference, then both components should be referenced to the same source, in this case the ADC reference. Alternatively, the circuit can be powered from an external +5 volt reference. POWER SUPPLY VOLTAGE 2.65 2.50 2.35 5.25 5.20 5.15 5.10 5.05 5.00 4.95 4.90 4.85 4.80 4.75 2.60 2.55 2.45 2.40 40.25 38.00 35.75 39.50 38.75 37.25 36.50 Figure 22. Typical Ratiometric Operation Since any voltage variation is transferred to the accelerometer’s output, it is important to reduce any power supply noise. Simply following good engineering practice of bypassing the power supply right at Pin 14 of the ADXL150/ADXL250 with a 0.1 µF ca- pacitor should be sufficient. |
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