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LMX1204EVM: Problems using divider and multiplier mode

Samuel Meyer
Prodigy 10 points
Part Number: LMX1204EVM
Other Parts Discussed in Thread: LMX1204

Hi,
I have difficulties using the LMX1204EVM in diviser or multiplier mode. Buffer mode work as intended but diviser and multiplier mode output the same spectrum as buffer mode.
For example in divide by 2 mode, with a 6 GHz input frequency at 3 dBm, output spectrum is the same than in buffer mode even after applying a reset (see screenshot and registers below).
I'm using v.1.7.5.7 of TICS Pro.
Did I miss a parameter to config ?


Thanks in advance,


Samuel

3286.HexRegisterValues.txt 
R90	0x5A0000
R86	0x560000
R79	0x4F0000
R75	0x4B0000
R72	0x480000
R67	0x430000
R65	0x410000
R34	0x220000
R33	0x210000
R29	0x1D0000
R28	0x1C0000
R25	0x19000A
R24	0x180001
R23	0x172040
R22	0x160800
R21	0x150000
R20	0x140000
R19	0x130000
R18	0x120000
R17	0x110000
R16	0x100000
R15	0x0F0800
R14	0x0E0000
R13	0x0D0003
R12	0x0C0000
R11	0x0B0000
R9	0x090000
R8	0x080010
R7	0x070000
R6	0x060000
R5	0x050000
R4	0x040000
R3	0x034007
R2	0x020100
R0	0x000000

  • 0
    TI__Genius 12550 points

    Hi Samuel,

    The operating mode selection of the LMX1204 is straight forward, where you can follow the below steps to operate in Divider mode or Multiplier mode.

    1. Divider mode:

    i. Load the default config file (Silicon Default)

    ii. Change the input operating frequency

    iii. Change the CLK_MUX to "Divider"

    iv. Set the CLK_DIV value to required divide value.

    You should get the required divided clocks out.

    2. Multiplier Mode:

    i. Load the default config file (Silicon Default)

    ii. Change the input operating frequency

    iii. Change the CLK_MUX to "Multiplier"

    iv. Set the CLK_MULT value to required frequency in the range of 3.2G to 6.4G.

    v. Calibrate the Multiplier to lock the VCO at desired frequency.

    You should get the required Multiplied clocks out.

    Thanks!

    Regards,

    Ajeet Pal

  • 0 in reply to Ajeet Pal
    Prodigy 10 points

    Hi,

    Thank you for the reply.

    I followed your instructions but I did not manage to get the correct result. It seems that diviser/multiplier mode don't turn on on the board.

    Best regards

    Samuel

  • 0 in reply to Samuel Meyer
    TI__Genius 12550 points

    Hi Samuel,

    Which version of LMX1204EVM you are using for your testing? There is a silicon difference (even registers map) in before production and final release part. There was a "HSDC097E" board, which was released with old silicon during sample and the latest "HSDC097A" board was released with final silicon.

    If you already the have latest evaluation board, you can try with the below TICS Pro config file to operate in divider and multiplier mode.

     LMX1204_6G_Div8.tcs

    LMX1204_800M_Mul4.tcs

    Thanks!

    Regards,

    Ajeet Pal 

  • 0 in reply to Ajeet Pal
    Prodigy 10 points

    I checked and you are right. I'm using the "HSDC097E1" board which has a pre-production silicon. Is there a way to test this board with the corresponding software ?

    Thanks !

    Best regards

    Samuel