4
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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 latest WaveVision software is available through the
National Semiconductor website:
http://www.national.com/analog/adc/wavevision5.
If a software CD is included with the evaluation board kit,
then use the provided software and instructions to install
WaveVision and ensure compatibility with this evaluation
board.
1. Apply power to the WaveVision5™ board and
connect it to the computer using a USB cable. See
the WaveVision5™ User Guide 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 power to the ADC16DV160
Evaluation Board to insure that the FPGA on the
WaveVision5
Data
Capture
Board
is
not
damaged.
2. Connect a clean +3.0V power supply to Power
Connectors P1 and P4. Connect a clean +1.8V
power supply to Power Connectors P2 and P3.
3. Connect a 160 MHz signal from a 50-Ohm source to
connector J4 for the input Clock. Be sure to use a
bandpass filter before the Evaluation Board. Set the
amplitude to 18 dBm.
4. Connect a signal from a 50-Ohm source to
connector J2 (I Channel) or J3 (Q-Channel). Be sure
to use a bandpass filter before the Evaluation Board.
For best results, also attach a 3dB 50 ohm
attenuator right at the input SMA of the eval board.
This will help match the impedance between the
cables/signal source to the eval board input.
5. 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
WaveVision™ software.
4.0 Functional Description
The ADC16DV160 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. The ADC16DV160 Evaluation Board comes
configured for input frequencies greater than 70MHz. To
accurately evaluate the dynamic performance of this
converter, the input test signal will have to be passed
through a high-quality bandpass filter.
4.2 ADC reference circuitry
