i am thinking to use the adis16460 with external clock to synchronize it with my control loop (Direct Sample Control MODE), i will be happy if you can please explain me about how this effects system performance  as i came across the next line: 

"The sync input clock functions below the specified minimum value but at reduced performance levels" ?

i am planning to provide a 2kHz clock signal, so i assume that the low pass filter configuration (as seen in figure 29) will be all most the same as 2KHZ is very close to the default 2048Hz , is that assumption correct?

best regards