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LMX2592: Eval board and part does not lock at certain frequencies or at wrong frequencies

Karoly Becze
Prodigy 10 points
Part Number: LMX2592


I am using TICS Pro 1.4

I input 491.52MHz to the eval board and I am getting /16 of the VCO (431.25MHz) though according to the settings it should be /12 i.e 575MHz . I attached the settings as exported from TICS PRO. Any ideas of what is wrong?


Thanks

Fullscreen HexRegisterValues_575MHz_gets431MHz.txt Download 
R64	0x4000AF
R62	0x3E0000
R61	0x3D0001
R59	0x3B0000
R48	0x3003FC
R47	0x2F00CF
R46	0x2E0F23
R45	0x2D0075
R44	0x2C0000
R43	0x2B0000
R42	0x2A0000
R41	0x290800
R40	0x280000
R39	0x278204
R38	0x26002A
R37	0x254000
R36	0x240820
R35	0x23099B
R34	0x22C3F0
R33	0x214210
R32	0x204210
R31	0x1F0401
R30	0x1E0034
R29	0x1D0084
R28	0x1C2924
R25	0x190000
R24	0x180509
R23	0x178842
R22	0x162300
R20	0x14012C
R19	0x130965
R14	0x0E018C
R13	0x0D4000
R12	0x0C7003
R11	0x0B0018
R10	0x0A10D8
R9	0x090302
R8	0x081084
R7	0x0728B2
R4	0x041943
R2	0x020500
R1	0x01080A
R0	0x00231C

  • 0
    TI__Expert 5370 points

    Dear Karoly,

    thank you for your interest in LMX2592. I loaded your hex file and do not see anything obvious that is wrong. Do you consistently get this answer? Do you make sure every time you change the desired frequency you hit the FCAL_EN check box?

    Regards, Simon.

  • 0 in reply to Simon Damphousse
    TI__Expert 8505 points

    Karoly,

    I tried your script and it locks to 575MHz normally. Can you try to start from the default mode, from TICS Pro go to "Default configurations" then click the first in the dropdown. See if you get 1.8GHz first, then load your script. If doesn't work, click RESET=1 then RESET=0 to soft reset the device and load your script.

    Regards,

    Brian Wang