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Figure 2: Test Set Up
3.0 Quick Start
Refer to
Figure 1
for locations of jumpers, test points and
major components. Refer to
Figure 2
for the test set up.
The board is configured by default to use a crystal clock
source and internal reference. Refer to Section 4.0 and
the Appendix for more information on jumper settings.
The input network of this board is configured for input
frequencies up to approximately 70MHz. Refer to Section
4.1 for more information about input networks.
You can download the latest version of the WaveVision 5
software from http://www.national.com
1. Apply power to the WaveVision5™ board and
connect it to the computer using a USB cable. See
the WaveVision5™ Board Manual for operation of
that board. Connect the evaluation board to the
WaveVision5™ Data Capture Board.
NOTE: power
to the WaveVision5 Data Capture Board should
be applied before the power to the ADC14DC105
Evaluation Board to ensure that the FPGA on the
WaveVison5 Data Capture Board is not damaged.
2. Connect a clean +5V power supply to pin 2 of Power
Connector JR1. Pin 1 is ground.
3. Connect a signal from a 50-Ohm source to
connector J9 (Channel A). Be sure to use a
bandpass filter before the Evaluation Board.
4. Adjust the input signal amplitude as needed to
ensure that the signal does not over-range by
examinining a histogram of the output data with the
WaveVision5™ software.
4.0 Functional Description
The ADC14DC105 Evaluation Board schematic is shown
in
Section 6.
A list of test points and jumper settings can
be found in the Appendix.
4.1 Analog Input
To obtain the best distortion results the analog input
network must be optimized for the signal frequency being
applied. Examples of input networks are shown in
Figures 3 and 4. The ADC14DC105 Evaluation Board
comes configured for input frequencies up to 70MHz as
seen in
Figure 4
. The input network is intended to accept
a low-noise sine wave signal of up to 2V peak-to-peak
amplitude.
To
accurately
evaluate
the
dynamic
performance of this converter, the input test signal will
have to be passed through a high-quality bandpass filter.
For input frequencies above 70MHz the circuit of
Figure 4
may be used.
