Part Number: LMX2820EVM
Other Parts Discussed in Thread: LMX2820
We are trying to implement Instant Calibration for the LMX2820 and followed the procedure described in the application note.
After completing the steps in Section 2.2, we read Register R75 and observed that rb_DBLR_CAL_DONE (bit 12) was set to 1, indicating that the calibration process had completed successfully.
Following Section 2.3, we were able to read and extract the generated LUT values without any issues.
We then proceeded with Section 2.4, writing all the generated LUT values back to the device as described in the application note.
However, after programming the LUT values, when we attempted to generate an output frequency of 5684 MHz, the PLL did not lock.
Could you please help us understand:
- If there are any additional steps required after writing the LUT values?
- Whether there are any specific register settings that need to be verified for Instant Calibration mode?
Any guidance on debugging the lock failure would be greatly appreciated. If required i can attach the registers that we are writing and LUT Values that were generated.
