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LMX2592: Higher frequency operation

Pradeep Kumar68
Intellectual 420 points

Part Number: LMX2592
Other Parts Discussed in Thread: USB2ANY

I have 4 LMX2592 PLL on my Board. All are having Different Loop filter values. Osc in is 100MHz.

What We are observing is till 7310MHz PLL will get lock. But after 7311MHZ till 9800MHz PLL is not getting locked.

I Have checked the Reg value. I took the same register value and programmed Eval board. Eval board is working fine.

I am unable to resolve this issue. So please let me know, where I am going wrong here.

  • 0
    TI__Expert 8865 points
    Hi Pradeep,
    I have connected you to an expert App Engineer on this device. The response might be delayed due to Easter holidays. I would suggest you to post your schematic ,TICSpro file and your programming procedure, which might be helpful here.
    Thanks for having patience.
    Best regards
    Puneet
  • 0 in reply to Puneet Sareen
    Intellectual 420 points

    Here I am attaching SChematic and tic pro screenshot

    Fullscreen Tic pro reg.txt Download 
    R64	0x400077
R62	0x3E0000
R61	0x3D0001
R59	0x3B0000
R48	0x3003FD
R47	0x2F08CF
R46	0x2E0F22
R45	0x2D2BF2
R44	0x2C0000
R43	0x2B0000
R42	0x2A0000
R41	0x293A98
R40	0x280000
R39	0x278104
R38	0x260024
R37	0x255000
R36	0x240011
R35	0x23021B
R34	0x22C3EA
R33	0x212A0A
R32	0x20210A
R31	0x1F0001
R30	0x1E0435
R29	0x1D0084
R28	0x1C2924
R25	0x190000
R24	0x180509
R23	0x178842
R22	0x162300
R20	0x14012C
R19	0x130965
R14	0x0E039C
R13	0x0D4000
R12	0x0C7001
R11	0x0B0018
R10	0x0A10D8
R9	0x090302
R8	0x081084
R7	0x0728B2
R4	0x041943
R2	0x020500
R1	0x010808
R0	0x00231C

  • 0
    TI__Mastermind 28031 points
    Pradeep,
    I just wanted to emphasize that guaranteed VCO tuning range is 3550 - 7100 MHz. To go above 7100 MHz, you need to use the frequency doubler. To go below 3550 MHz you need to use the channel divider.

    So if you try to tune your VCO to 7310 MHz, this would be pushing the upper range of the VCO and likely it would not go there; you need the doubler for this frequency.

    Regards
    Dean
  • 0 in reply to Dean Banerjee
    Intellectual 420 points

    Hi Dean,

    We are aware of this doubler. We are Programming R30 with 0435 for frequency above 7100MHz.

    But still we are not getting higher frequencies.

    In the above mail, I have attached reg setting also. So please go through it once.

  • 0 in reply to Pradeep Kumar68
    TI__Guru** 115360 points
    Hi Pradeep,

    Can you use USB2ANY to program your board? I don't see any problem with the hardware, so lets focus on the software first.