Tool/software:
Hi team,
our customer is using LMK05318 and met below issue, can you help to see what may lead to below behavior?
While debugging the LMK05318B, I discovered a significant deviation from the 156.25 MHz output frequency, causing the connected port to go LINK DOWN. The following table shows the test results.
|
156.25 MHz Clock Test |
|
|
|
|
Normal Frequency Measured by Oscilloscope |
Actual Test Frequency |
Frequency Deviation |
Converted to PPM |
|
Normal |
156.24023M |
|
|
|
Negative Deviation |
156.13812M |
10211 |
653.5ppm |
|
Positive Deviation |
156.47512M |
234890 |
1503.3ppm |
|
Positive Deviation |
156.27420M |
33970 |
217.4ppm |
The LMK05318B operates normally in freerun mode for extended periods. However, in SYNCE mode, the device operates normally for the first few hours, but then experiences increasing frequency deviation (from a minimum of 2 hours to a maximum of 15 hours), causing the prototype device and the peer port to experience a link down.
