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Generating Non-Sinusoid Arbitrary Waveforms
Output DAC
Chapter 10
Refer to Figure 10-2. The following describes the blocks that generate
non-sinusoid waveforms.
Figure 10-2. AFG Simplified Block Diagram
The AFG uses the 13-bit DAC to generate the waveforms. Each time the
AFG's frequency generator clocks the DAC, the DAC outputs a voltage
value that corresponds to the point value in the waveform segment. The bits
set in the DAC determine the voltage value. For non-sinusoid functions, the
DAC codes in the AFG's segment memory set the appropriate bits of the
DAC. For the sinusoid function, the output of the frequency generator sets
the bits to the appropriate value (see " Generating Sinusoid Waveforms" on
page 450).
The DAC can also receive segment data from external sources, like the
VXIbus. The external sources immediately set the DAC to an output
voltage that corresponds to the DAC code value sent by the source. Each
time the DAC receives a new code, the DAC's output is set to the value in
the new code. Thus, the waveform frequency depends on the rate at which
the DAC receives the codes.
The output DAC's voltage range is from -5.12 V to +5.11875 V.
Block Diagram Description
447
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