Part Number: LMX2820
Hello all,
Sorry if this is an obvious question and I'm not seeing the answer in the datasheet in advance.
I am curious as to the functionality of the muxout pin on the LMX2820. I know it is used for spi readback but can it be used for other functions such as lock detect as well? I am using an off the shelf board containing an LMX2820 and an FPGA. Unfortunately, the hardware designer did not route the lock detect bit back to the FPGA, only to an led. I would like to query if the PLL is locked after programming. I believe I can readback register 0x4A (by writing 0xCA0000 and looking at muxout) and observing bits [15:14] to determine the lock status. I am curious if I can make this muxout pin directly output a copy of the lock detect signal so I do not need to support SPI reads.
As an aside, I am also confused by this rb_LD dropdown in the TICS Pro software.
Changing this dropdown writes to register 4A but from the register map document (SNAU251A) register 4a is read only. What is the purpose of this dropdown?
Thanks.
