Part Number: LMK03318
The output may disappear after working for a while. Sometimes it always keeps OK.
The output becomes OK after reset the power supply.
Any suggestion for this?
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In reply to Alan O:
In reply to Timothy T:
This is BOE.
I used the second clock input, 100MHz differential input and 270MHz output. After running for a period of time, the LMK03318 output is 230Mhz instead of 270Mhz.
I checked the PLL, the P_LOL signal status lamp flickered. When the P_LOL signal status lamp is always on, the output of LMK03318 changes from 270 Mhz to 230 Mhz.
Here is my setup interface, Could you tell me where the settings are incorrect?
Looking forward to your reply.
In reply to user4949375:
I suggest the following changes, based on your frequency plan:
On Inputs/PLL page...
External (onboard) C2 cap = 3300 pF
According to the settings you recommended, the P_LOL lamp still flickers and the LMK03318 will still turn 230MHz after running for a period of time.
Do you know how to solve this problem?
Is your reference input a stable clock source, like a crystal oscillator, or is it a noisy recovered clock? It should be stable in both frequency and amplitude.
Also, did you try triggering a soft reset after writing all registers, so the PLL/VCO gets re-calibrated (after the reference input is stable)?
I set the Charge Pump Gain to 0.4mA, the LMK03318 outputs is 270Mhz.Now the LMK03318 can work properly.
Thank you very much for your help.
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