NI PXI-5404
Analog Output

Analog waveforms are generated by the following process:

1. The direct digital synthesis output high-speed DAC receives the 12-bit digital waveform data from the direct digital synthesis chip.
2. A lowpass filter filters the direct digital synthesis output.
3. This filtered signal passes through the first amplification stage and then passes to a comparator to generate the CLOCK out on the front panel.
4. The amplified signal also passes through another amplification stage.
5. The final amplified signal gets AC coupled and goes to the SINE out.

Refer to the NI PXI-5404 Block Diagram for more information about analog waveform generation.

The following figure shows the timing relationships of the trigger input and waveform output. t_d1 is the pulse width on the trigger signal. t_d2 is the time delay from trigger to output on the SINE out.