AD5621 conversion rate VS output voltage setting time

In website of RS, it says that the conversion rate of AD5621 is as high as 1.7MSPS.

http://hken.rs-online.com/web/p/general-purpose-dacs/6976912/

However, as is seen in the datasheet, the voltage setting time is 10us, which means that the maximum EFFECTIVE conversion rate could only be around 100kHz.

 

Does the conversion rate calculate from SPI rate/16 bit, which is around 1.7MSPS? If so, what is the point of conversion rate?

 

Thank you very much!

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