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Clock & timing

Clock & timing forum

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LMK61E2EVM: TICS Pro setting

Roy Chou1

Genius 14465 points

Part Number: LMK61E2EVM
Other Parts Discussed in Thread: LMK61E2, LMK61E0M

Hi Team,

I use TICS Pro to generate the desired output frequency. Below is my loop filter and PLL setting. I set output frequency = 18.75MHz, but the result is 18.75*4=75MHz. Could you let me know which factor cause 4times difference? I think it may be a part coefficient difference between LMK61E0 and LM61E2

So if I would like to generate the 75MHz output frequency in LMK61E2, I need to set output frequency=75MHz/4=18.75MHz, right?

And I could follow the register setting(set fo=18.75MHz) directly, right?

Regards,

Roy

over 4 years ago

0 Amin Eshraghi over 4 years ago

TI__Expert 6140 points

Hi Roy,

Which TICSpro profile was used? Was it the LMK61E2? This looks like the LMK61E0M profile..

R22 and R23 should have the output divider value on, so that can be updated after as well, to change the frequency.

If VCO is locked at 4.8 GHz then output divider should equal 256 in order to achieve 18.75 MHz. Perhaps R22 didn't get update here?

I would recommend running again with LMK61E2 profile.

Thanks and regards, Amin

0 Roy Chou1 over 4 years ago in reply to Amin Eshraghi

TI__Genius 14465 points

Hi Amin,

I only find LMK61E0M in TICS pro. How could I run again with LMK61E2 profile?

Roy

0 Roy Chou1 over 4 years ago in reply to Roy Chou1

TI__Genius 14465 points

Hi Amin,

I find the LMK61E2 profile. Thank you.

Regards,

Roy