User`s manual

DDS Frequency
Generator (Frequency1
Generator)
Refer to Figure 10-3. This generator has excellent resolution and allows for
frequency sweeping, frequency-shift-keying, and output frequency lists.
However, its maximum frequency is the Reference Oscillator frequency
divided by 4.
To generate precision frequencies for the memory and output DAC clock,
the output of the DDS frequency generator is applied to a DAC. The DAC
output is filtered and the resultant clock signals clocks the memory and
output DAC to create the waveforms.
Divide-by-N Frequency
Generator (Frequency2
Generator)
Refer to Figure 10-4. This generator has better phase noise characteristics
and permits higher frequency operation (up to the Reference Oscillator
Frequency). The output of this filter directly clocks the memory and output
DAC.
Figure 10-3. Generating Waveforms Using a Frequency1 Generator
Figure 10-4. Generating Waveforms Using a Frequency2 Generator
Chapter 10 Block Diagram Description 449