UG-287 Datasheet, PDF (9/12 Pages) Analog Devices – Evaluation Board User Guide

Evaluation Board User Guide
Data Capture
Click Data Capture in the menu bar of the main window to
read and store a sequence of output data from the DUT. The
Data Capture window (see Figure 14) provides controls for the
data storage location, data file name, register selection, data
format, and data file header. Each data collection cycle starts
when the DUT’s data-ready signal pulses.
Data Register Selection
The Data Capture window contains a list of sensor data, which
are associated with the output registers, along with a
corresponding selection check box. Use the check box to
include an output register in each data collection cycle of the data
record. The ADIS1613x, ADIS1637x, and ADIS1648x products
currently provide lower word registers, that capture the bit growth
associated with integrated filtering operations. For example,
X_GRYO_LOW is a 16-bit register that captures this bit growth for
the x-axis gyroscope in these products. While this register provides
16 more bits (for a total of 32-bits), the ADIS1648x products rarely
need more than 24 bits to preserve the precision available in the
ADIS1648x products, so many of the least significant bits in these
registers are not significant.
UG-287
Selecting the 16-bit option in the Data Capture menu includes
only the upper 16 bits of output data (for example, only
X_GRYO_OUT). Selecting the 32-bit option includes all 32 bits
in the data record (for example, X_GYRO_OUT and
X_GYRO_LOW). Selecting both 16-bit and 32-options result in
separate entries: one for the X_GYRO_OUT and another that
combines X_GYRO_OUT and X_GYRO_LOW data. For
maximum speed, select one or the other, but not both.
Data Record Options
Selecting the Add File Header check box controls the first line
of the data record file. Clearing this check box removes the header
line from the data record. Selecting the Use Scaled Data check
box causes the software to convert the digital output codes into
a decimal equivalent prior to storing them in the data record file.
When using scaled data, the result is rounded to the 4^th decimal
place. For finer resolution, uncheck the Use Scale Data option
and convert the twos complement result using post-event signal
processing routines.
Sample Rate
The sample rate is dependent on the data-ready signal coming
from the IMU and is typically associated with a register setting,
such as DEC_RATE in the ADIS16488.
Rev. B | Page 9 of 12