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That is one of the conventions commonly used to indicate an Active Low signal. So in this case, you pull Chip Select low when you want to access the chip. After you have toggled in all the data bits on the DIN line, you pull LDAC low.

The Pmod DA3 reference manual has a link to the D/A chip's datasheet. That is the best first place to look for information on the device's function. The required signal timings are on page 5 of the datasheet.

Edited by kwilber

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