ADIS16228 Datasheet, PDF (1/28 Pages) Analog Devices – Digital Triaxial Vibration Sensor

Data Sheet
Digital Triaxial Vibration Sensor
with FFT Analysis and Storage
ADIS16228
FEATURES
Frequency domain triaxial vibration sensor
Flat frequency response up to 5 kHz
Digital acceleration data, ±18 g measurement range
Digital range settings: 0 g to 1 g/5 g/10 g/20 g
Real-time sample mode: 20.48 kSPS, single-axis
Capture sample modes: 20.48 kSPS, three axes
Trigger modes: SPI, timer, external
Programmable decimation filter, 11 rate settings
Multirecord capture for selected filter settings
Manual capture mode for time domain data collection
FFT, 512-point, real valued, all three axes (x, y, z)
3 windowing options: rectangular, Hanning, flat top
Programmable FFT averaging: up to 255 averages
Storage: 14 FFT records on all three axes (x, y, z)
Programmable alarms, 6 spectral bands
2-level settings for warning and fault definition
Adjustable response delay to reduce false alarms
Internal self-test with status flags
Digital temperature and power supply measurements
2 auxiliary digital I/Os
SPI-compatible serial interface
Identification registers: serial number, device ID, user ID
Single-supply operation: 3.0 V to 3.6 V
Operating temperature range: −40°C to +125°C
15 mm × 24 mm × 15 mm aluminum package, flex connector
APPLICATIONS
Vibration analysis
Condition monitoring
Machine health
Instrumentation, diagnostics
Safety shutoff sensing
GENERAL DESCRIPTION
The ADIS16228 iSensor® is a complete vibration sensing system
that combines triaxial acceleration sensing with advanced time
domain and frequency domain signal processing. Time domain
signal processing includes a programmable decimation filter
and selectable windowing function. Frequency domain processing
includes a 512-point, real-valued FFT for each axis, along with
FFT averaging, which reduces the noise floor variation for finer
resolution. The 14-record FFT storage system offers users the
ability to track changes over time and capture FFTs with multiple
decimation filter settings.
The 20.48 kSPS sample rate and 5 kHz flat frequency band
provide a frequency response that is suitable for many machine
health applications. The aluminum core provides excellent
mechanical coupling to the MEMS acceleration sensors. An
internal clock drives the data sampling and signal processing
system during all operations, which eliminates the need for an
external clock source. The data capture function has three modes
that offer several options to meet the needs of many different
applications. In addition, real-time mode provides direct access
to streaming data on one axis. The SPI and data buffer structure
provide convenient access to data output. The ADIS16228 also
offers a digital temperature sensor and digital power supply
measurements.
The ADIS16228 is available in a 15 mm × 24 mm × 15 mm module
with flanges, machine screw holes (M2 or 2-56), and a flexible
connector that enables simple user interface and installation. It
has an extended operating temperature range of −40°C to +125°C.
FUNCTIONAL BLOCK DIAGRAM
DIO1 DIO2 RST
VDD
ADIS16228
INPUT/
OUTPUT
ALARMS
POWER
MANAGEMENT
GND
TRIAXIAL
MEMS
SENSOR
TEMP
SENSOR
SUPPLY
ADC
CONTROLLER
CAPTURE
BUFFER
FILTER
WINDOW
FFT
RECORD
STORAGE
CONTROL
REGISTERS
OUTPUT
REGISTERS
SPI
PORT
CS
SCLK
DIN
DOUT
Figure 1.
Rev. B
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