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LMK03806BEVAL: output frequency offset

David Park
Expert 6245 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 18820 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):

    6064.HexRegisterValues.txt
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    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
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    Thanks,

    Kadeem

  • 0 in reply to Kadeem Samuel
    Prodigy 30 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.

     
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    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
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


    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 18820 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 18820 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 30 points 
    I'll wait for your reply. Thank you.
  • 0 in reply to JinBae Kim
    TI__Mastermind 18820 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.

    JinBae_LMK03806_3_14_25_HexRegisterValues.txt
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    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
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    Thanks,

    Kadeem