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Application Note 9626
Typical Performance Curves
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(Continued)
SFDR = 86.83dBc
CENTER 1.000MHz
SPAN 1.000MHz
FIGURE 14. A 1MHz FUNDAMENTAL ON A 1MHz SPAN UNFILTERED
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SFDR = 75.34dBc
CH1 200mV ~
M 50.0ns
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START 500kHz
STOP 20.00MHz
FIGURE 15A. OSCILLOSCOPE PLOT
FIGURE 15B. SAMPLE PLOT
f CLK
FIGURE 15. A 5MHz FUNDAMENTAL TO --------------- . f CLK = 40MHz
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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:
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.
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