ADLINK PXI-2502 - Manual (Page 59)

Appendix A
• 51
Standard Function w. Frequency Variant
Users can alter the frequency of gener-
ated waveforms by driving DAWR from
external signal via AF0/AF1/SSI.
The resultant updating rate should be
kept within 1MHz. In this demo, iterative
generation is used.
Iterative Generation w. Intermediate Space
Utilize DLY2_counter to separate con-
secutive waveform generations in itera-
tive generation mode.
In this demo, the original standard sine
wave is repeated several times as
specified in IC_counter, with intermedi-
ate space determined by DLY2_counter.
Piece-wise Generation
When the value specified in UC_counter
is smaller than the sample size of
waveform, the waveform is generated
piece-wisely. The intermediate space
between each piece is determined by
DLY2_counter.
In this demo, the UC_counter is set to
1/8 of the sample size of waveform.
Amplitude Modulated
When external D/A reference is used,
applying sinusoidal voltage reference
will result in an amplitude modulated
(AM) waveform generation.
Users can use one D/A channel to
generate sine wave, loop it back to
AOEXTREF_A/B pin, and generate AM
waveform by another D/A channel using
external reference. All can be done in a
single D/A group.
Frequency Modulated