User`s manual

26 Operation Theory
4.2 D/A Conversion
DAQ/PXI-2500 series offers flexible and versatile analog output
scheme to fit users’ complex field applications. In order to take full
advantages of DAQ/PXI-2500 series, we suggest users carefully
read the following con-tents.
Architecture
There are up to 8-channel of 12-bit Digital-to-Analog Converter
(DAC) available in the DAQ/PXI-2502. Four D/A channels are
packed into one D/A group, i.e., DAQ/PXI-2502 contains two D/
A groups, and DAQ/PXI-2501 has only one D/A group.
Figure 4-6: Block Diagram of D/A Group
(Group B of DAQ/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
digital codes for all en-abled DA channels are ready and