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LMX2592EVM: LOCK Detect Issue

Part Number: LMX2592EVM
Other Parts Discussed in Thread: USB2ANY, , LMX2594, LMX2594EVM, LMX2592


I have just started to work on three different EVMs from TI which are LMX2592EVM / LMX2594EVM and LMX2694EVM. I utilize TICS Pro software with USB2Any device to program these 3 devices. While I manage to read back rb_LD_VTUNE (R110) as LOCKED for LMX2594 and LMX2694, rb_LD_VTUNE register (R68) is  read back as Unlocked (Fvco Low) for LMX2592.

1) I set RFoutA to 5.1 GHz.

2) I toggle FCAL_EN, the LED D1 turns on and I see signal around 5.1 GHz on Signal Analyzer.

3) I set MUXOUT_SEL as Read Back from user controller menu.

4) I read register R68 from  raw registers menu and it is read as 0000.

I want to be sure that the PLL is locked. 

Register Map before read back is as following.

Register Map Read Back is as following.

Best Regards,