At this moment I’m working at a prototyping-project in which I use a DA
converter of Analog Devices. The DAC in question is the AD1854KRS.
I’ve downloaded the datasheet from your website. In my project I have no
interest in controlling the DAC using the SPI-port. According to the datasheet
this should be possible. My question is what to do with the SPI-pins of the
DAC, namely CLATCH, CCLK and CDATA. At this moment they are connected to the
digital-ground. Is this correct, or should those connected to VCC or may those
pins left floating? I can’t find the necessary information in the datasheet. I
would appreciate if you could answer these question.
If the SPI port is unused on the AD1854, it is preferred that CLATCH be tied to
digital +5V and CDATA and CCLK be tied to digital ground. It is, however, also
OK to tie CLATCH to digital ground in this case. Unused inputs should not be