LMK61E2EVM: LMK61E2-EVM setting

Hi Kailyn, 

That's odd that this issue only happens at certain frequencies. Has the customer tried unchecking and then re-checking the SWR2PLL box to reset the PLL after programming?

The LMK61xx Oscillator Programming Tool has actually been replaced with TICSPro, and the LMK61E0M profile can be used to program any device in the LMK61xx family with some minor tweaks to registers R21 and R22. Can you ask the customer to try with TICSPro and see if there's any difference? I believe there have been some updates to the programming sequence which might solve this issue. 

Regards, 

Connor 

Hi Connor，

Thank you very much for your reply, yes, I advised the customer to reset PLL to try before, but it couldn't resolve the problem.

I would recommend him to use TICSpro to try again.

Best regards

Kailyn

Hi Kailyn, 

Great, hopefully that will resolve their problem. If there's still any issues, could you ask them to send the register map of the configurations that don't have a proper output? They can do this by going into the "Raw Registers" tab in TICSPro or the LMK61xx programming tool, clicking "Read all registers", and then "Export register map" to generate a text file with all the register values of the device. Then I could see if I can recreate the issue on my end. 

Regards, 

Connor 

HI  Connor,

Thank you for your reply. Two questions are needed to confirm with you.

1. TICSPro has no LMK61E2, it has only LMK61E0.

2. Using LMK61E0 to try, it also has no output with specified frequency.

In addition, I attached the registers configuration  with LMK61xx Oscillator Programming Tool. Please help to confirm. 

R0 0x0010
R1 0x010B
R2 0x0233
R8 0x08B0
R9 0x0901
R16 0x1000
R17 0x1180
R21 0x1501
R22 0x1600
R23 0x172E
R25 0x1900
R26 0x1A2E
R27 0x1B00
R28 0x1C00
R29 0x1D00
R30 0x1E00
R31 0x1F00
R32 0x2001
R33 0x210C
R34 0x2228
R35 0x2303
R36 0x2404
R37 0x2500
R38 0x2600
R39 0x2700
R47 0x2F00
R48 0x3000
R49 0x3110
R50 0x3200
R51 0x3300
R52 0x3400
R53 0x3500
R56 0x3800
R72 0x4802

Best regards

kailyn 

Hi Kailyn,

Correct, TICSPro only has a profile for the LMK61E0M. R21 can be manually changed according to the LMK61E2 register map to select the desired output type. The rest of the registers should me shared between LMK61E0M and LMK61E2. 

I will review the register map and test it on an EVM early next week . 

Regards, 

Connor 

Hi Conner，

Thank you very much, and the customer feedback that he couldn't output 100, 50, 10  with above registers configuration.

1。1. What jumper configuration is on the EVM? =>Jumper used the default configuration, no change.

2. Are they using USB power or an external supply?=>USB power

3. How are they measuring the output signal?=>used the passive probe and SMA to measure

4.Can they recreate this issue on any other frequencies besides 100, 50, 10 MHz?

=>30/60/70/80/90/110MHz could normally output, but these OUT_DIV don't equal to 46。If use 100/50/20MHz for test，OUT_DIV=46，there is no output.

5. Have they tried disabling block read/write in TICSPro under the options tab? He has tried, the same results.

Best regards

Kailyn

Hi Kailyn, 

Everything in the setup looks ok, and I can't recreate the issue on my end so I'm beginning to wonder if the unit is somehow defective. Would it be possible to switch it out with another LMK61E2 unit? 

Also, what happens on the customer's board when they change the N divider value and output divider values from the default setting? For example, using the default EZ config 100 MHz configuration, then changing both the N-divider and output divider to 47, 48, etc. The output divider doesn't strictly need to be 46 in order to achieve these frequencies. Does the output frequency stay at 100 MHz as expected? I can test out any configurations on my end as well if they can provide the register map. 

Regards, 

Connor 

Hi Connor，

Connor Lewis said:

For example, using the default EZ config 100 MHz configuration, then changing both the N-divider and output divider to 47, 48, etc.

Yes, if changed the output divider to 47,48, it could be normally output.

But the EZ configuration is auto configured 46, so he found the problem. 

What he means that if we used the clock IC, we usually used the EZ configuration, and generally we couldn't to change the output divider manually.

So he doubt if the tool has the problem with this frequency.

Best regards

kailyn

Hello Kailyn,

We are doing some lab testing and will get back to you later.

Best,

Andrea

Hi Connor,

Thank you very much for your reply, I would  confirm with the customer,  if he also need help, I will contact you with Email.

Regards

Kailyn