Digital Triaxial Vibration Sensor

with FFT Analysis and Storage

Data Sheet

ADIS16228

Rev. B

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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

ADIS16228

RECORD

STORAGE

ALARMS

INPUT/

OUTPUT

CONTROLLER

ADC

TRIAXIAL

MEMS

SENSOR

TEMP

SENSOR

SUPPLY

POWER

MANAGEMENT

CS

SCLK

DIN

DOUT

GND

VDD

RST

DIO1

CONTROL

REGISTERS

SPI

PORT

OUTPUT

REGISTERS

FILTER

WINDOW

FFT

CAPTURE

BUFFER

DIO2

Figure 1.