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ADXL50 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADXL50 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Monolithic Accelerometer With Signal Conditioning ADXL50* FEATURES Complete Acceleration Measurement System on a Single Monolithic IC Full-Scale Measurement Range: 50 g Self-Test on Digital Command +5 V Single Supply Operation Sensitivity Precalibrated to 19 mV/g Internal Buffer Amplifier for User Adjustable Sensitivity and Zero-g Level Frequency Response: DC to 10 kHz Post Filtering with External Passive Components High Shock Survival: >2000 g Unpowered Other Versions Available: ADXL05 ( 5 g) FUNCTIONAL BLOCK DIAGRAM *Patents pending. For convenience, the ADXL50 has an internal buffer amplifier with a full 0.25 V to 4.75 V output range. This may be used to set the zero-g level and change the output sensitivity by using external resistors. External capacitors may be added to the resis- tor network to provide 1 or 2 poles of filtering. No external active components are required to interface directly to most analog-to-digital converters (ADCs) or microcontrollers. The ADXL50 uses a capacitive measurement method. The ana- log output voltage is directly proportional to acceleration, and is fully scaled, referenced and temperature compensated, resulting in high accuracy and linearity over a wide temperature range. Internal circuitry implements a forced-balance control loop that improves accuracy by compensating for any mechanical sensor variations. The ADXL50 is powered from a standard +5 V supply and is robust for use in harsh industrial and automotive environments and will survive shocks of more than 2000 g unpowered. The ADXL50 is available in a hermetic 10-pin TO-100 metal can, specified over the 0 °C to +70°C commercial, and –40°C to +85 °C industrial temperature ranges. Contact factory for avail- ability of devices specified for operation over the –40 °C to +105 °C automotive temperature range. GENERAL DESCRIPTION The ADXL50 is a complete acceleration measurement system on a single monolithic IC. Three external capacitors and a +5 volt power supply are all that is required to measure accelerations up to ± 50 g. Device sensitivity is factory trimmed to 19 mV/g, resulting in a full-scale output swing of ±0.95 volts for a ±50 g applied acceleration. Its zero g output level is +1.8 volts. A TTL compatible self-test function can electrostatically deflect the sensor beam at any time to verify device functionality. VREF OUTPUT VOUT DEMODULATOR REFERENCE SENSOR +1.8V BUFFER AMP PREAMP OSCILLATOR ADXL50 C2 OSCILLATOR DECOUPLING CAPACITOR SELF TEST (ST) C3 +5V DEMODULATOR CAPACITOR C1 C1 COM R1 VPR VIN– R3 R2 +3.4V 4 7 5 1 2 3 8 10 9 6 © Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 |
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