Quick Start
Figure 11. WaveVision 5 main window command buttons
•
Sampling Rate
- When the signal source panel is selected, the clock frequency is displayed. This is
initially the internal clock. In this example, 1800 MHz is generated by the LMX2541 on the reference
board. The sampling rate is determined by the FPGA when the board is powered up. The calculation is
accurate to better than 1%. If an external source is in use, confirm that this number corresponds to the
clock reference that is applied. If it is not correct, subsequent data captures and display will not be
correct.
•
Resolution
– This will always be set to the ADC12D1X00RF resolution which is 12 bits.
•
Acquisition Size
- This setting displays and selects the number of samples captured in each
acquisition. 4K samples is the default, with settings up to 32K samples. A larger sample size increases
the equivalent FFT bandwidth resolution, but at the expense of more memory and slower acquisition
time.
•
Data Format
- The default data format is offset binary for the ADC12D1X00RF.
•
FFT buffers to average
- The last option is the FFT averaging function. Using this feature, subsequent
samples can be averaged to obtain improved signal to noise. However, this is at the expense of time.
2.5.4
Right Panels - Registers
Next, configure the hardware (including the ADC) using the Registers control panel on the right side. This
is the most important of all the panels for controlling the ADC1xDxxxx(RF)RB. This panel has twelve sub-
tabs that control the settings of the board and registers inside the ADC12D1X00RF. The twelve sub-tabs
are shown below and include;
Settings, Config, Cal Adjust, I-channel, Q-channel, DES Adjust, t
AD
Adjust,
AutoSync, and Temperature.
The last three tabs are register contents so that the user may verify register
settings to be programmed in the system.
14
ADC1xDxxxx(RF)RB Reference Board
SNAU146 – September 2013
Copyright © 2013, Texas Instruments Incorporated