概要

The ADXL1001/ADXL1002 deliver ultralow noise density over an extended frequency range with two full-scale range options, and are optimized for industrial condition monitoring. The ADXL1001 (±100g) and the ADXL1002 (±50 g) have typical noise densities of 30 µg/√Hz and 25 µg/√Hz, respectively. Both accelerometer devices have stable and repeatable sensitivity, which is immune to external shocks up to 10,000 g.
The ADXL1001/ADXL1002 have an integrated full electrostatic self test (ST) function and an overrange (OR) indicator that allow advanced system level features and are useful for embedded applications. With low power and single-supply operation of 3 V to 5.25 V, the ADXL1001/ADXL1002 also enable wireless sensing product design. The ADXL1001/ADXL1002 are available in a 5 mm × 5 mm × 1.80 mm LFCSP package, and are rated for operation over a −40°C to +125°C temperature range.

 

特徴

► Single in plane axis accelerometer with analog output
► Linear frequency response range from dc to 11 kHz (3 dB point)
► Resonant frequency of 21 kHz
► Ultralow noise density
► 30 µg/√Hz in ±100 g range (ADXL1001)
► 25 µg/√Hz in ±50 g range (ADXL1002)
► Overrange sensing plus dc coupling allows fast recovery time
► Complete electromechanical self-test
► Sensitivity performance
► Sensitivity stability over temperature 5%
► Linearity to ±0.1% of full-scale range
► Cross axis sensitivity ±1% (ZX), ±1% (YX),
► Single-supply operation
► Output voltage ratiometric to supply
► Low power consumption 1.0 mA
► Power saving standby operation mode with fast recovery
► RoHS compliant
► −40°C to +125°C temperature range
► 5 mm × 5 mm × 1.80 mm LFCSP package

 

アプリケーション

► Condition monitoring
► Predictive maintenance
► Asset health
► Test and measurement
► Health usage monitoring system (HUMS)

 

動作理論

The ADXL1001/ADXL1002 are high frequency, low noise single-ax is microelectromechanical systems (MEMS) accelerometers that provide an analog output that is proportional to mechanical vibration. The ADXL1001/ADXL1002 have high g ranges of 100 g and 50 g and are suitable for vibration measurements in high bandwidth applications such as vibration analysis systems that monitor and diagnose machine or system health.
The low noise and high frequency bandwidth allows the measurement of vibration patterns caused by small moving parts, such as internal bearings, and the high g range provides the dynamic range to be used in high vibration environments such as heating, ventilation, and air conditioning (HVAC) and heavy machine equipment. To achieve proper performance, be aware of system noise, mounting, and signal conditioning.
System noise is affected by supply voltage noise. The analog out put of the ADXL1001/ADXL1002 is a ratiometric output; therefore, supply voltage modulation affects the output. Use a properly decoupled stable supply voltage to power the ADXL1001/ADXL1002 and to provide a reference voltage for the digitizing system.
The output signal is impacted by an overrange stimulus. An over load indicator output feature is provided to indicate a condition that is critical for an intelligent measurement system. For more information about the overrange features, see the Overrange section.
Proper mounting is required to ensure full mechanical transfer of vibration to accurately measure the desired vibration rather than vibration of the measurement system, including the sensor. A common technique for high frequency mechanical coupling is to utilize a sensor stud mount system while considering the mechanical interface of fixing the ADXL1001/ADXL1002 in the stud. For lower frequencies (below the full capable bandwidth of the sensor), it is possible to use magnetic or adhesive mounting. Proper mounting technique ensures proper and repeatable results that are not influenced by measurement system mechanical resonances and/or damping at the desired frequency, and represents an efficient and proper mechanical transfer to the system being monitored.
Proper application specific signal conditioning is require to achieve optimal results. An understanding of measurement frequency range and managing overload condition is important to achieve accurate results. The electrical output signal of the ADXL1001/ADXL1002 requires some band limiting and proper digitization bandwidth. See the Interfacing Analog Output Below 10 KHz section and the Interfacing Analog Output Beyond 10 KHz section for more information.