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LMK03806BEVAL: output frequency offset

David Park
Expert 6770 points
Part Number: LMK03806BEVAL
Other Parts Discussed in Thread: LMK04806, LMK03806

Tool/software:

Hi,

Customer is evaluating EVM for from 12MHz~25MHz output clock.

In the TICS pro, it shows 25MHz and 12MHz but they are actually 5.2% higher than calculation in TICS pro.

With bypass, OSCout shows 25MHz so it's not reference input clock issue.

Could you check this issue?

Thanks.

  • 0
    TI__Mastermind 22970 points

    David,

    Do you have a Hex Register Value export that you can provide here? In the meantime, see if importing these registers and then writing all registers works (may need to try with the LMK04806 GUI instead of the LMK03806 GUI, this is an issue I have run into in the past):

    Fullscreen 6064.HexRegisterValues.txt Download 
    R0 (INIT)	0x00020200
R0	0x00000C80
R1	0x00000CC1
R2	0x00000D02
R3	0x00001883
R4	0x000018C4
R5	0x00001905
R6	0x04010006
R7	0x01010007
R8	0x01010008
R9	0x55555549
R10	0x9142400A
R11	0x3401100B
R12	0x138C006C
R13	0x3B03826D
R14	0x0300000E
R15	0x8000800F
R16	0xC1550410
R24	0x00000018
R25	0x02C9C419
R26	0x8FA8001A
R27	0x1800009B
R28	0x0010001C
R29	0x008000BD
R30	0x0500029E
R31	0x001F001F

    Thanks,

    Kadeem

  • 0 in reply to Kadeem Samuel
    Prodigy 40 points

    Hi. Kadeem Samuel.

    LMK03806B GUI Register Value is as follows. 

    And if I write each Register one by one, it generates a frequency that is about 5% higher.

     
    R0 (INIT)	0x80020140
R0	0x00000C80
R1	0x00000CC1
R2	0x00000D02
R3	0x00001883
R4	0x000018C4
R5	0x00001905
R6	0x01010006
R7	0x01010007
R8	0x01010008
R9	0x55555549
R10	0x9142400A
R11	0x3401100B
R12	0x130C006C
R13	0x3B03826D
R14	0x0300000E
R16	0xC1550410
R24	0x00000018
R26	0xAFA8001A
R28	0x0020001C
R29	0x008000BD
R30	0x0400033E
R31	0x001F001F


    When applying LMK04806 GUI using Register Value sent by Kadeem Samuel, Clock is not output properly.

    Thank you.
  • 0 in reply to JinBae Kim
    TI__Mastermind 22970 points

    JinBae,

    I will test this on the bench, and should have a configuration by tomorrow.

    Thanks,

    Kadeem

  • 0 in reply to Kadeem Samuel
    TI__Mastermind 22970 points

    JinBae,

    My apologies for the delay, but I will need an additional day for this.

    Thanks,

    Kadeem

  • 0 in reply to Kadeem Samuel
    Prodigy 40 points 
    I'll wait for your reply. Thank you.
  • 0 in reply to JinBae Kim
    TI__Mastermind 22970 points

    JinBae,

    I believe that the value lies in the field PLL_N_CAL - this field is not updated automatically, and needs to match the value of the N divider. 

    When I update this field, then toggle RESET high then low, then write all registers, I get the correct frequency output.

    Fullscreen JinBae_LMK03806_3_14_25_HexRegisterValues.txt Download 
    R0 (INIT)	0x80020140
R0	0x00000C80
R1	0x00000CC1
R2	0x00000D02
R3	0x00001883
R4	0x000018C4
R5	0x00001905
R6	0x04010006
R7	0x01010007
R8	0x01010008
R9	0x55555549
R10	0x9142400A
R11	0x3401100B
R12	0x138C006C
R13	0x3B03826D
R14	0x0300000E
R16	0xC1550410
R24	0x00000018
R26	0x8FA8001A
R28	0x0010001C
R29	0x0080029D
R30	0x0500029E
R31	0x001F001F

    Thanks,

    Kadeem

  • 0 in reply to Kadeem Samuel
    Prodigy 40 points

    Hi. Kadeem Samuel.

    The correct operation was verified in the following order.

    1. Reset High then Low.

    2. PLL Group Register Write Operation Excute. (R24~R31)

    3. Other Control Register Write Operation Excute. (R0~R14)

    Thank you for your help.

    Have a good day.