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2-3
Analog Output Channels
DDA-08 boards contain two quad DACs (quad DAC0 and quad DAC1),
which provide eight analog output channels. DDA-16 boards contain four
quad DACs (quad DAC0, quad DAC1, quad DAC2, and quad DAC3),
which provide 16 analog output channels. Quad DAC0 contains channels
0 through 3; quad DAC1 contains channels 4 through 7; quad DAC2
contains channels 8 through 11; quad DAC3 contains channels 12 through
15.
Each analog output channel contains an input buffer for storing data.
Through software, the host computer loads a single value into the input
buffer of a single channel or loads multiple values into the input buffers of
a sequence of consecutive channels. The analog output values are held in
the input buffers until the channels are updated. At that point, the values
currently held in the input buffers are written to the channels, updating
their output values.
You can update a single analog output channel immediately when the
input buffer is loaded, or you can update several analog output channels
simultaneously using a pacer clock. Refer to page 2-6 for more
information about pacer clocks.
If you want to update several analog output channels simultaneously, you
use software to include one or more quad DACs in the update group. All
channels on the quad DACs in the update group are updated
simultaneously at each pulse of the pacer clock.
Note:
In multi-channel mode, the DDA-08/16 writes all data to a
consecutive range of analog channels.
●
If the Start Channel is greater than the Stop Channel, the channel
sequence is [Start Channel, ..., Last Channel, 0, ..., Stop Channel],
where Last Channel is the highest numbered channel for the
DDA-08/16 model the application is using.
●
The DDA-08/16 can optionally output to all DACs in the range
simultaneously, or write to one DAC in the range at each timing
event.
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