ADXL150 Analog Devices, Inc., ADXL150 Datasheet
ADXL150
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ADXL150 Summary of contents
Page 1
... ADXL50 offer lower noise, wider dynamic range, reduced power consumption and improved zero g bias drift. The ADXL150 is a single axis product; the ADXL250 is a fully integrated dual axis accelerometer with signal conditioning on a single monolithic IC, the first of its kind available on the com- mercial market ...
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... Self-test output varies with supply voltage. 7 When using ADXL250, both Pins 13 and 14 must be connected to the supply for the device to function. Specifications subject to change without notice +25 C for J Grade +5.00 V, Acceleration = Zero g , unless otherwise noted ADXL150JQC/AQC Min 40 33 MIN MAX V /2 – 0. ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADXL150/ADXL250 feature proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, pro per ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... OUT Transverse Axis: The axis perpendicular ( the axis of sensitivity. Zero g Bias Level: The output voltage of the ADXL150/ ADXL250 when there is no acceleration (or gravity) acting upon the axis of sensitivity. The output offset is the difference between the actual zero g bias level and (V ...
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... Figure 6. Typical Output Response vs. Frequency of ADXL150/ADXL250 Board that Has Been Conformally Coated –10 –20 –30 5.5 6.0 –40 –30 –20 –10 Figure 7. Typical Zero g Drift for a Number of Units 600 g 500 g ...
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... ADXL150/ADXL250 –5 NOISE FROM INTERNAL CLOCK –10 –15 – TIME – s Figure 9. Typical Output Noise Voltage with Spikes Generated by Internal Clock SELF-TEST OUTPUT (0.2V/DIV) SELF-TEST INPUT (2V/DIV TIME – ms Figure 10. Typical Self-Test Response 2 ...
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... In applications where a flat response up to 500 Hz is needed better to operate the device at 38 mV/g and use an external post filter. Note also that connecting V pin adds load from this added load will consume the ADXL150/ OUT ADXL250’s 100 A (typical) output current drive OUT ...
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... Note that the “+” input of the external op amp uses the offset null pin of the ADXL150/ADXL250 as a reference, biasing the op amp at midsupply, saving two resistors and reducing power consumption. The offset null pin connects to the V point inside the accelerometer via important not to load this pin with more than a few microamps ...
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... With a +2.5 volt zero g level, the maxi- mum gain will equal: 2 Volts 38 mV/g Times the Max Applied Acceleration 0.1 F Figure 18. Offset Nulling the ADXL150/ADXL250 Using a Trim Potentiometer REV GND ...
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... SELF-TEST Figure 20. ּ One-Pole Post Filter Circuit with SF and Zero g Offset Trims approximately 1.6 times the 3 dB bandwidth. For example, the typical rms noise of the ADXL150 using a 100 Hz one pole post filter is: Because the ADXL150/ADXL250’s noise is, for all practical 660m g purposes, Gaussian in amplitude distribution, the highest noise amplitudes have the smallest (yet nonzero) probability ...
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... Figure 22. Typical Ratiometric Operation Since any voltage variation is transferred to the accelerometer’s output 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 F ca- pacitor should be sufficient. TP (DO NOT CONNECT) ...
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... Response When a Signal Is Present. CALIBRATING THE ADXL150/ADXL250 If a calibrated shaker is not available, both the zero g level and scale factor of the ADXL150/ADXL250 may be easily set to fair accuracy by using a self-calibration technique based on the 1 g acceleration of the earth’s gravity. Figure 24 shows how gravity and package orientation affect the ADXL150/ADXL250’ ...
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... MINIMIZING EMI/RFI The architecture of the ADXL150/ADXL250, and its use of synchronous demodulation, makes the device immune to most electromagnetic (EMI) and radio frequency (RFI) interference. The use of synchronous demodulation allows the circuit to reject all signals except those at the frequency of the oscillator driving the sensor element. However, the ADXL150/ADXL250 ...
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... OUT Cf b. Single-Pole Post Filtering, No Signal Amplification + OFFSET ADJUST OUT V OS NULL PIN c. Single-Pole Post Filtering and Signal Amplification Figure 25. Interfacing the ADXL150/ADXL250 Series Accelerometers to an ADC –14– ADC +V S ADC INPUT RESISTANCE + ADC ...
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... MAX 14 8 0.419 (10.643) 0.394 (10.008 PIN 1 0.300 (7.62) 0.195 (4.953) 0.115 (2.921) 0.215 (5.461) 0.119 (3.023) 0.050 0.020 (0.508) 0.0125 (0.318) (1.27) 0.013 (0.330) 0.009 (0.229) BSC –15– ADXL150/ADXL250 0.345 (8.763) 0.290 (7.366 0.050 (1.270) 0.016 (0.406) ...