Tool/software:
Dears,
My customer uses LMX2582 for wireless communication equipment and is currently testing the first version of PCBA. After completing the configuration of LMX2582, the customer set the PLL division coefficient in real time (refer to the method described in 7.5.2 of the specification) via registers. After setting the register multiple times, although the MUXout signal pin output is still high, the RFout pin has no output signal, as if the LMX2582 chip is in a hang-up state. If the LMX2582 is reset, the output signal of the RFout pin can return to normal.
The customer uses LDO to power the LMX2582, and the power supply itself has less noise, but the customer does not set a separate AGND for the LMX2582, but directly connects the GND of the LMX2582 to the GND of the system.
the attached is the schematics, FYI.
Please help me see how to solve this problem.
Thank you!
