AD1854: SPI port unused

Question 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. Answer 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 left floating.

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AD1854 Obsolete
The AD1854 is a high performance, single-chip stereo, audio DAC delivering 113 dB Dynamic Range and 112 dB SNR (A-weightedâ€”not muted) at 48 kHz sample...
AD1854 on Analog.com