### Q

When using programmable modulus mode, is the tuning resolution listed the sameno matter what sample frequency I use?

### A

No. The absolute resolution is calculated as FSAM/2^64, though even thatdoesn’t fully express it, because with Programmable Modulus, you can actually

get values which fall between the discrete numbers that come from using 2^64 as

a non-variable in this equation.

## Top Comments

No.

In programmable modulus mode, the tuning denominator (modulus) is B*(2^32), where B is a number from 1 to 2^32 - 1. Because B is programmable, the modulus is programmable. Hence, programmable modulus…

The maximum tuning rate depends on whether you program frequency tuning words via the SPI port or by directly sending them to the DDS digital core via the parallel data port. In the latter case, the…