ADI ADcmXL3021 Wideband Low Noise Triaxial Vibration Sensor Solution

The ADcmXL3021 is a complete vibration sensing system that combines high performance vibration sensing (using micro- electromechanical systems (MEMS) accelerometers) with a variety of signal processing functions to simplify the development of smart sensor nodes in condition-based monitoring (CBM) systems. The typical ultralow noise density (26 μg/√Hz) in the MEMS accelerometers supports excellent resolution. The wide bandwidth (dc to 10 kHz within 3 dB flatness) enables tracking of key vibration signatures on many machine platforms. The signal processing includes high speed data sampling (220 kSPS), 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 available in a 23.7 mm × 27.0 mm × 12.4 mm 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 36 mm flexible cable, which enables a wide range of location and orientation options for system mating connectors. The ADcmXL3021 requires only a single, 3.3 V power supply and supports an operating temperature range of −40℃ to +105℃.

Main features of ADcmXL3021:

Triaxial, digital output MEMS vibration sensing module

±50 g measurement range

Ultralow output noise density, 26 μg/√Hz (MTC mode)

Wide bandwidth: dc to 10 kHz within 3 dB flatness (RTS mode)

Embedded fast data sampling: 220 kSPS per axis

6 digital FIR filters, 32 taps (coefficients), default options:

High-pass filter cutoff frequencies: 1 kHz, 5 kHz, 10 kHz

Low-pass filter cutoff frequencies: 1 kHz, 5 kHz, 10 kHz

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 0.42 Hz to 53.7 Hz 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: 220 kSPS 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: 3.0 V to 3.6 V

Operating temperature range: −40℃ to +105℃

Automatic shutdown at 125℃ (junction temperature)

23.7 mm × 27.0 mm × 12.4 mm aluminum package 36 mm flexible, 14-pin connector interface

Mass: 13 g

ADcmXL3021 application:

Vibration analysis

CBM systems

Machine health

Instrumentation and diagnostics

ADcmXL3021 MEMS sensor block diagram

Safety shutoff sensing

ADcmXL3021 Evaluation Board EVAL-ADCM

The EVAL-ADCM is a simple to use kit that allows quick performance evaluation of Analog Devices 3-axis, digital output MEMS vibration sensing module. The ADcmXL3021 module consists of 3 single axis, ultra low noise, high bandwidth ADXL1002 accelerometers, a fully implemented signal chain and MCU to incorporate configurable digital FIR filters, spectral analysis through internal FFT, configurable alarm monitoring, and time domain capture and statistical analysis. The EVAL-ADCM is ideal for evaluation of the ADcmXL3021 vibration sensing module since the kit readily provides full spectrum experience of all features of the module.

Evaluation Board EVAL-ADCM Advantages and Features:

The EVAL-ADCM kit includes one ADcmXL3021 module

Easily connects to PC for full features evaluation

Evaluation software for effortless configuration of the module, register setup, data display and data logging

High-speed SPI to USB adaptor for high data rate Real Time Streaming (RTS)

Evaluation Board EVAL-ADCM Outline Drawing

Evaluation Board EVAL-ADCM Assembly Hardware Diagram

Evaluation Board EVAL-ADCM PCB Design