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Application Note 9602
Using the HSP-EVAL Test Platform
The HSP-EVAL DDS platform allows quick testing of spectral
properties of a given DAC. The Numerically Controlled
Oscillator/Modulator (NCOM) generates digital sinewave
patterns that are loaded into the DAC. The analog output of
the DAC is the reconstructed sinewave pattern. The program
NCOMCTRL allows downloading of the desired center
frequency. The clock or sampling frequency is 25MHz. To
determine the center frequency codeword the following
formula is used:
HSP-EVAL/HPS45116
NCOM EVALUATION BOARD
CLOCK
Center Frequency HEX = (Desired Frequency/25MHz) x 2 32
This 32-bit hexadecimal word will create the fundamental. In
order to ensure zero phase offset the cursor should be
moved to the LOAD select. Pressing the spacebar the value
should be toggled from 1 to 0 and back to 1 again. This will
ensure that any previous values in the phase register are
cleared and the sinewave pattern is started at zero phase.
The HSP-EVAL setup is powered from the DAC module
power-supply banana jacks. The output of the setup can be
observed on an oscilloscope or a spectrum analyzer.
HI5731
DAC MODULE
CIRCUIT
HSP45116
NUMERICALLY
CONTROLLED
OSCILLATOR
HI5731
DAC
PC INTERFACE
+5V
POWER
- 5.2V
50 ?
SMA
CABLE
SUPPLY
SOFTWARE
INCLUDED
SPECTRUM ANALYZER
PERSONAL COMPUTER
FIGURE 16. INTERSIL HI5731/DDS EVALUATION SYSTEM SETUP BLOCK DIAGRAM
3-7
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