UG-1533
Rev. 0 | Page 12 of 31
The
Help
menu (Label 1 in Figure 24) offers information about the
•
Analog Devices Website
•
User Guide
•
Context Help
•
About
When hardware is connected to the USB port, the software
automatically detects the connected device and displays the
information (see Label 2 in Figure 24).
The
Oversampling Ratio
box (Label 3 in Figure 24) sets the
oversampling ratio applied to the captured data. After this
control is set to any value other than
None
, the software sums
up the consecutive conversion results together to increase the
effective resolution. The number of conversions summed
together is set by the
Oversampling Ratio
box. Oversampling
by a factor of four provides one additional bit of resolution, or
a 6 dB increase in dynamic range, or in other words, ΔDR =
10 × log10(OSR) in dB (see Figure 26).
The
Throughput
box is Label 4 in Figure 24. The default
throughput (sampling frequency) is 1.75 KSPS. The user can
adjust the throughput to a minimum of 10 kSPS. If the user
enters a value larger than the ability of the existing device, the
software reverts to the maximum throughput.
The
Voltage Reference
dropdown menu is Label 5 in Figure 24. By
default, this reference is 5 V (
minimum and maximum voltage calculations are based on this
reference voltage. If the user changes the reference voltage, this
input must be changed accordingly.
Click
Single Capture
to perform a single capture, and click and
Continuous Capture
to perform a continuous stream capture
from the µModule (see Label 6 in Figure 24).
Select
Samples
to analyze data using the number of samples
(see Label 7 in Figure 24). The maximum number of samples the
software can support is 524,288.
The five capture tabs (see Label 8 in Figure 24) display the data
in different formats, which include the following:
•
Waveform
•
Histogram
•
FFT
•
INL_DNL
•
Summary
202
1
1-
130
Figure 26. FFT with Oversampling, OSR = 256, Inputs Shorted
