Data Capture - Analog Devices EVAL-ADAQ7768-1 User Manual

User Guide
CONFIGURING THE BOARD AND THE ADAQ7768-1

DATA CAPTURE

The ADAQ7768-1 has excellent performance in both AC and DC
measurement. The digital filter inside the ADAQ7768-1 can be
programmed with a wide range of decimation ratios to achieve
input bandwidth from a few Hertz to a maximum of 204 kHz. The
succeeding subsections demonstrate examples of data captures
using AC and DC signals.
AC Measurement
By default, the software configures the ADAQ7768-1 to perform
wide bandwidth measurement with the wideband low ripple digital
filter (brick wall) of 110 kHz of -3 dB bandwidth, with ODR = 256
kSPS. In this mode, the wide band dynamic range (noise), as well
as other AC parameters such as signal-to-noise ratio (SNR), total
harmonic distortion (THD), spurious free dynamic range (SFDR),
analog.com
Figure 21. Input Range Through Mechanical Switch (S2)
etc. are evaluated. Perform the following steps for AC measure-
ment:
1. Modify the PGIA gain according to the desired analog input
2. Apply the analog signal to the input (IN+ and IN–) connectors of
3. Click Proceed to Analysis > Run Once in the Chip View of
4. The sampled data is now present in the data capture tabs
Also test the device's anti-aliasing performance by sweeping an
out-of-band signal to the input across frequency.
EVAL-ADAQ7768-1
signal range. Click Apply Changes for this to take effect.
the evaluation board.
the software. ACE captures 8192 samples by default. Vary the
sample count by choosing from the dropdown.
(waveform, histogram, and FFT tabs). Change among each of
these tabs to view the results.
a typical AC measurement.
Figure 22 shows an FFT plot for
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