What clocks the chip? is it the MCLK or is it the numerically controlled oscillator (NCO)? Though the text implies it, I don't see anything in the documentation showing an oscillator whose frequency is controlled as finely as 1 part in 2^28. How is this possible?
It seems more logical that the MCLK clocks the chip. But if that were so, an MCLK of 50MHz producing a 1MHz output frequency would have a granularity of 1 part in 50 - way too coarse.
My circuit does actually achieve frequency granularity of something like 1 part in 2^28 - I LOVE IT! But how is such a finely tuned oscillator possible and how does it relate to the MCLK?