LMX2595: Output frequency calculation SW

Minki Li1

Part Number: LMX2595

Is there had any code example that to calculation what value of Channel divider,SYSREF divider,N divider and Fraction need if i want output a frequency in the chip output range?

Because i want to put it into a MCU so i don't need using TICS to do gen out the value every time

Thank You

over 5 years ago

0 Noel Fung over 5 years ago

TI__Guru** 107780 points

Hi Minki,

Unfortunately we don't have sample codes on this.

0 Minki Li1 over 5 years ago in reply to Noel Fung

Prodigy 235 points

Had any formula and condition can provide?

Thank You

0 Noel Fung over 5 years ago in reply to Minki Li1

TI__Guru** 107780 points

Hi Minki,

You should be able to find all of these information in the datasheet.

0 Minki Li1 over 5 years ago in reply to Noel Fung

Prodigy 235 points

How to work with one frequency with multi solution?

Channel divider,N divider and Fraction which should come first?

0 Noel Fung over 5 years ago in reply to Minki Li1

TI__Guru** 107780 points

Hi Minki,

Given the output frequency, you should be able to find the appropriate channel divider value and figure out the VCO frequency. With your target phase detector frequency, you can work out the N divider value .

Here is a short training video that may help you understand the block diagram of PLL.

training.ti.com/ti-precision-labs-clocks-and-timing-phase-lock-loop-building-blocks-part-1

Clock & timing

Clock & timing forum

LMX2595: Output frequency calculation SW