Analog Devices Inc. ADcmXL3021 Triaxial Vibration Sensor

Analog Devices ADcmXL3021 Triaxial Vibration Sensor is a wide bandwidth, low noise, highly integrated vibration monitoring module, combining advanced MEMS sensors and an optimized signal chain and embedded signal processing into a mechanically optimized package, enabling predictive maintenance solutions. The ADcmXL3021 is designed to simplify the development of smart sensor nodes in Condition-Based Monitoring (CBM) systems.

The typical ultralow noise density (26μg/√Hz) in the MEMS accelerometers supports excellent resolution. The wide bandwidth (DC to 10kHz within 3dB flatness) enables tracking of key vibration signatures on many machine platforms.

The signal processing includes high speed data sampling (220kSPS), 4096 time sample record lengths, filtering, windowing, fast Fourier transform (FFT), user configurable spectral or time statistic alarms, and error flags. The serial peripheral interface (SPI) provides access to a register structure that contains the vibration data and a wide range of user configurable functions.

The ADcmXL3021 is offered in a 23.7mm × 27.0mm × 12.4mm aluminum package with four mounting flanges to support installation with standard machine screws. This package provides consistent mechanical coupling to the core sensors over a broad frequency range. The electrical interface is through a 14-pin connector on a 36mm flexible cable, which enables a wide range of location and orientation options for system mating connectors.

The ADcmXL3021 requires only a single, 3.3V power supply and supports an operating temperature range of -40°C to +105°C.

Features

Triaxial, digital output MEMS vibration sensing module
±50 g measurement range
Ultralow output noise density, 26μg/√Hz (MTC mode)
Wide bandwidth of DC to 10kHz within 3dB flatness (RTS mode)
Embedded fast data sampling: 220kSPS per axis
6 digital FIR filters, 32 taps (coefficients), default options:
- High-pass filter cutoff frequencies of 1kHz, 5kHz, 10kHz
- Low-pass filter cutoff frequencies of 1kHz, 5kHz, 10kHz
- User-configurable digital filter option (32 coefficients)
Spectral analysis through internal FFT
- Extended record length: 2048 bins per axis with user-configurable bin sizes from 0.42Hz to 53.7Hz
- Manual or timer-based (automatic) triggering
- Windowing options: Rectangular, Hanning, Flat-top
- FFT record averaging, configurable up to 255 records
- Spectral-defined alarm monitoring, 6 alarms per axis
Time domain capture with statistical metrics
- Extended record length: 4096 samples per axis
- Mean, standard deviation, peak, crest factor, skewness, and kurtosis
- Configurable alarm monitoring

Real-time data streaming of 220kSPS on each axis
- Burst mode communication with CRC-16 error checking
Storage: 10 data records for each axis
On-demand self test with status flags
Sleep mode with external and timer-driven wakeup
Digital temperature and power supply measurements
SPI-compatible serial interface
Identification registers: Factory preprogrammed serial number, Device ID, User programmable ID
Single-supply operation of 3.0V to 3.6V
Operating temperature range of -40°C to +105°C
- Automatic shutdown at 125°C (junction temperature)
Package
- 23.7mm x 27.0mm x 12.4mm aluminum package
- 36mm flexible, 14-pin connector interface

Applications

Vibration analysis
CBM systems
Machine health

Instrumentation and diagnostics
Safety shutoff sensing

Videos

Additional Resources

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