LMK05318: Algorithm for REG Settings

JiaHua Wang

Part Number: LMK05318

Hi Team,

I'm implementing sync sampling in my application, so I need output an clk locked to REF which has a freq range of 1Hz - 1MHz.

Is the algorithm for reg settings inside TICS-Pro open? Or any other simple method exist, which I can calculate the right value of regs with the freq change of REF and get the best performance.

Thanks,

Jiahua.

over 6 years ago

0 Hao Z over 6 years ago

TI__Mastermind 18070 points

Hi JiaHua,

Please find attached: LMK05x18_startpage.zip

You can start from bCALC_FREQPLAN_Update(), which gets called when "Calculate frequency plan" button is clicked. It may seem complicated but that's just because there are many registers and situations involved. The basic PLL frequency calculation is quite simple and covered in this video: https://training.ti.com/ti-precision-labs-clock-and-timing-system-design-considerations-frequency-planning-part-1?context=1139747-1140114-1140118-1139974

Regards,
Hao

0 JiaHua Wang over 6 years ago in reply to Hao Z

Prodigy 60 points

Hi Hao,

That's very useful for me.

Thang you!

Jiahua.

Clock & timing

Clock & timing forum

LMK05318: Algorithm for REG Settings