ADC08D1020DEV/NOPB National Semiconductor, ADC08D1020DEV/NOPB Datasheet - Page 15

• Manufacturer Part Number: ADC08D1020DEV/NOPB
• Description: BOARD DEV FOR ADC08D1020
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of ADC08D1020DEV/NOPB

• Number Of Adc's: 2
• Number Of Bits: 8
• Sampling Rate (per Second): 1G
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: 870 mVpp
• Power (typ) @ Conditions: 1.6W @ 1GSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: ADC08D1020
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADC08D1020DEV

Seen from left to right, the following tools are
available:
Ø Plot Actions menu: This menu contains
Ø Plot Options: This button opens a dialog
Ø FFT Options: The toolbar shown in Figure
Ø Magnifying glass tool: This tool allows
Ø Arrow Tool: The arrow tool is used to
Ø Line Annotation Tool: To draw lines on
Ø Text Annotation Tool: To draw labels on
commands that pertain to this particular
plot. You may export the plot data to a file,
print it, save it as a graphic, or change the
plot’s colors.
box with options that pertain to this
particular plot.
annotations, or other elements in this
dialog.
maintains default options for new plots.
You may edit the default options by
choosing Default Plot Options from the
Settings menu.
15 is from an FFT plot, and thus contains a
button to edit the options for the FFT
calculation. Depending upon the type of
plot, various options will be present on the
toolbar.
section below for more information about
these options.
you to zoom in and out to see fine details in
the plot. Click and drag a box from upper-
left to lower-right to zoom in on the region
of interest.
lower-right to upper-left to zoom out. With
the magnifying glass tool selected, click
the right mouse button to return to a full
view.
select, move, and edit annotations. To edit
an annotation, double click it with the arrow
tool. To delete an annotation, select it with
the arrow tool and press the Delete key on
your keyboard.
the plot, select this tool. Drag to draw new
lines.
endpoints of the line, double-click the
appropriate end with the arrow tool.
the plot, select this tool and click at the
desired location in the plot.
justification,
annotation, double-click it with the arrow
tool.
To add arrowheads or fix the
Please consult the appropriate
The
Click and drag a box from
location,
You may turn off labels,
WaveVision
or
text
To edit the
software
of
an
10.1 The Waveform Plot
The Waveform plot displays the raw samples
collected from the hardware.
primarily used to verify the integrity of collected
data. The waveform is the best view in which to
diagnose a distorted signal, an irregular clock, a
low-amplitude signal, and many other common
ADC system problems.
The Waveform plot also quickly shows how much
of the ADC’s dynamic range the analog input
signal occupies.
10.2 The FFT Plot
The
computes a Fast Fourier Transform (FFT) of the
sample set, and displays the results in an FFT
plot. The resulting FFT plot is, in many respects,
the heart of the software because it shows the
frequency content of the analog input signal. It
marks
selectable number of harmonics. It also labels
their order and frequencies. It shows the power
in the fundamental and harmonics. Hover the
mouse cursor over a harmonic to display
information about it.
The FFT may be used to diagnose common ADC
problems such as input spectral impurity, clock
phase noise, and clock jitter. The FFT plot also
shows several statistics on the quality and purity
of the collected samples including SNR, SINAD,
THD, SFDR, and ENOB. These statistics are to
be interpreted with the following definitions
(which
Semiconductor ADC datasheet):
Ø Signal to Noise Ratio (SNR) is the ratio,
Ø Signal to Noise Plus Distortion (S/N+D
expressed in dB, of the RMS value of the
input signal to the RMS value of the sum of
all other spectral components below one-
half the sampling frequency, not including
harmonics or DC.
or SINAD) Is the ratio, expressed in dB, of
the RMS value of the input signal to the
RMS value of all of the other spectral
components
frequency,
excluding DC.
WaveVision
the
are
fundamental
repeated
including
below
software
in
frequency,
half
harmonics
every
This plot is
automatically
the
National
and
clock
but
15
a