ADLINK DAQe-2502 - Manual (Page 41)

Operation Theory 31
4.2 D/A Conversion
The DAQ-/DAQe-/PXI-2502/2501 card offers flexible and versatile
analog output scheme to fit your complex field applications. In
order to take full advantages of the DAQ-/DAQe-/PXI-2502/2501
card, it is suggested that you carefully read this section.
Architecture
There are up to eight channels of 12-bit Digital-to-Analog Con-
verter (DAC) available in the DAQ-/DAQe-/PXI-2502/2501 card.
Four D/A channels are packed into one D/A group. The DAQ-/
DAQe-/PXI-2502 comes with two D/A groups, while the DAQ-/
DAQe-/PXI-2501 card has only one D/A group.
Figure 4-6: Block Diagram of D/A Group
(Group B of DAQ/DAQe-/PXI-2502 is identical to Group A shown above.)
Figure 4-6 shows the D/A block diagram. DAC are controlled
implicitly by CPLD and have their outputs updated only when digi-
tal codes for all enabled DA channels are ready and latched. This
ensures D/A conversions to be synchronized for each channel in
the same D/A group. You can use this property to perform multi-
channel waveform generation without any phase-lag.