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LMK05318EVM: when using external crystal,dpll can't lock

Part Number: LMK05318EVM

Before, I have been using the 48MHz crystal refresh on the board as XO input. When I use the external precise 10MHz crystal  as XO input, why can't DPLL lock?

  • LMK05318 XO input port do not support Crystal, because Crystal (passive device) need a positive feedback circuits to start oscillation. 10 MHz XO (with a power supply pin) can work with LMK05318.
  • Sorry,I didn't say exactly,I use 10MHz sitime,not passive crystal.Then I input the ref of 10MHz from signal generator,I need to change the dpll frequency and phase lock threshold at a big value,then the led lights show correctly.However,the output from output7 is not stable compared with the ref.
    I also want to know,when using ZDM and achieve synchronous,then loss of reference,can the synchronous of phase maintain a period of time?
  • 1, OUT7 is not phase stable with signal generator 10 MHz. See status screen and send .tcs file.
    2, No. ZDM can't support hitless switch and holdover.
  • Thankyou Shawn,

    But when I don't use ZDM,and after pll locked,I turn off the REF .Then the output wave from output0 begin move compared with the REF wave,though I give a long tuning word history.Here is my tcs file,by txt format

    Thankyou again.

    haifeng1.txt
    [SETUP]
    ADDRESS=888
    CLOCK=8
    DATA=4
    LE=2
    PART=LMK05318
    IFACE=I2C
    ADDRESS_I2C=0x64
    INTERFACE_SPEED=400
    
    [PINS]
    PINNAME00=REFSEL
    LOCATION00=9
    PINVALUE00=False
    PINNAME01=HW_CTRL
    LOCATION01=7
    PINVALUE01=False
    PINNAME02=PDN
    LOCATION02=3
    PINVALUE02=True
    PINNAME03=GPIO0
    LOCATION03=8
    PINVALUE03=False
    PINNAME04=GPIO1
    LOCATION04=6
    PINVALUE04=False
    PINNAME05=GPIO2
    LOCATION05=5
    PINVALUE05=False
    PINNAME06=Status0
    LOCATION06=10
    PINVALUE06=False
    PINNAME07=Status1
    LOCATION07=11
    PINVALUE07=False
    
    [MODES]
    NAME00=R0
    VALUE00=16
    NAME01=R1
    VALUE01=267
    NAME02=R2
    VALUE02=565
    NAME03=R3
    VALUE03=768
    NAME04=R4
    VALUE04=1024
    NAME05=R5
    VALUE05=1280
    NAME06=R6
    VALUE06=1536
    NAME07=R7
    VALUE07=1792
    NAME08=R10
    VALUE08=2760
    NAME09=R11
    VALUE09=2816
    NAME10=R12
    VALUE10=3099
    NAME11=R13
    VALUE11=3336
    NAME12=R14
    VALUE12=3584
    NAME13=R15
    VALUE13=3840
    NAME14=R16
    VALUE14=4096
    NAME15=R17
    VALUE15=4381
    NAME16=R18
    VALUE16=4863
    NAME17=R19
    VALUE17=4864
    NAME18=R20
    VALUE18=5120
    NAME19=R21
    VALUE19=5376
    NAME20=R22
    VALUE20=5632
    NAME21=R23
    VALUE21=5973
    NAME22=R24
    VALUE22=6229
    NAME23=R25
    VALUE23=6400
    NAME24=R26
    VALUE24=6656
    NAME25=R27
    VALUE25=6912
    NAME26=R28
    VALUE26=7169
    NAME27=R29
    VALUE27=7441
    NAME28=R30
    VALUE28=7744
    NAME29=R32
    VALUE29=8260
    NAME30=R35
    VALUE30=8960
    NAME31=R36
    VALUE31=9219
    NAME32=R37
    VALUE32=9472
    NAME33=R38
    VALUE33=9728
    NAME34=R39
    VALUE34=9986
    NAME35=R40
    VALUE35=10240
    NAME36=R41
    VALUE36=10496
    NAME37=R42
    VALUE37=10753
    NAME38=R43
    VALUE38=11146
    NAME39=R44
    VALUE39=11265
    NAME40=R45
    VALUE40=11523
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    VALUE41=11793
    NAME42=R47
    VALUE42=12039
    NAME43=R48
    VALUE43=12368
    NAME44=R49
    VALUE44=12618
    NAME45=R50
    VALUE45=12800
    NAME46=R51
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    NAME47=R52
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    NAME48=R53
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    VALUE54=15128
    NAME55=R60
    VALUE55=15375
    NAME56=R61
    VALUE56=15640
    NAME57=R62
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    NAME58=R63
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    VALUE59=16384
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    VALUE177=50497
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    VALUE179=50944
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    VALUE192=54272
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    VALUE212=59521
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    [FLEX]
    CH0_PREDRIVER=0
    CH1_PREDRIVER=0
    CH2_PREDRIVER=0
    CH3_PREDRIVER=0
    CH4_PREDRIVER=0
    CH5_PREDRIVER=0
    CH6_PREDRIVER=0
    CH7_PREDRIVER=0
    DPLL_REF_LOOPCTL_CHG_QUANT_INTG=0
    PLL1_BAW_CAPDAC=0
    PLL1_CP_TRIM=0
    PLL1_IGNORE_GPIO_PIN=0
    bFindAddressBtn=Find I2C Addr
    i2cAddr=0
    MATLAB_RUNTIME_DOWNLOAD_URL=https://www.mathworks.com/products/compiler/matlab-runtime.html
    bGotoStartupPage=Goto Start Page
    AbsDCO_ppb_error=0
    BAW_LOCK_PPM_THRESH=5
    BAW_UNLK_PPM_THRESH=10
    DPLL_PL_LOCK_calc=384.96 ps
    DPLL_PL_UNLK_calc=6.16 ns
    DPLL_REF_NUM_calculated=733007751850
    OUT0_ACT_freq=25
    OUT1_ACT_freq=25
    OUT2_ACT_freq=156.25
    OUT3_ACT_freq=156.25
    OUT4_ACT_freq=156.25
    OUT5_ACT_freq=156.25
    OUT6_ACT_freq=156.25
    OUT7_ACT_freq=156.25
    PLL1_PFD_freq_units=24.002400 MHz
    VCO1_freq=2500
    VCO1_start_freq=2499875000
    VCO1_stop_freq=2500125000
    VCO2_freq=0
    VCO2_start_freq=5500000000
    VCO2_stop_freq=6250000000
    bCALC_FREQPLAN=Calculate Frequency Plan
    bCalcDPLL_PLD=Recommended
    bDPLL_FDECR=Decrement
    bDPLL_FINCR=Increment
    bLoadCurrentVCOfreqRanges=Load current VCO freq ranges
    bRUN_SCRIPT=Run Script
    bResetNumerator0ppb=Reload Original DPLL Numerator
    bTest=Test
    bUpdateDetectorsBelow=Update Detectors Below
    bypass_run_script_warning=0
    cbDCO_MODE=2
    cb_allow_PLL2_prescaler_of_2=1
    fDPLL_Fastlock_Time=49.152000 ms
    hdr_act_freq=Actual Freq. (MHz)
    old_matlab=0
    sBAW_LOCK_ACCURACY_PPM=1
    sBAW_LOCK_AVG=2
    sBAW_TMEAS_LOCK_calc=19.20 ms
    sBAW_TMEAS_UNLK_calc=19.20 ms
    sBAW_UNLK_ACCURACY_PPM=1
    sBAW_UNLK_AVG=2
    sCH0_1_IN_freq=25000000
    sCH0_1_MUX=1
    sCH2_3_IN_freq=156250000
    sCH2_3_MUX=1
    sCH4_IN_freq=156250000
    sCH4_MUX=1
    sCH5_IN_freq=156250000
    sCH5_MUX=1
    sCH6_IN_freq=156250000
    sCH6_MUX=1
    sCH7_IN_freq=156250000
    sCH7_MUX=1
    sDPLL_DCO_FREQPPB_ACT=Not calculated
    sDPLL_DCO_STEP=0.01
    sDPLL_DCO_STEP_ACT=0.166437530425
    sDPLL_HISTCNT_calc=14.760000 s
    sDPLL_HISTDLY_calc=1.35 ms
    sDPLL_LBW=100
    sDPLL_LBW_ACCURACY=5
    sDPLL_LBW_ACT=101.3
    sDPLL_LOCK_ACCURACY_PPM=1
    sDPLL_LOCK_AVG=10
    sDPLL_LOCK_PPM=1
    sDPLL_PEAK=0.1
    sDPLL_PEAK_ERROR=1
    sDPLL_REF_COMMON_DIV=1000000000
    sDPLL_TDC_freq=25.000000 MHz
    sDPLL_TMEAS_LOCK_calc=96.00 ms
    sDPLL_TMEAS_UNLK_calc=96.00 ms
    sDPLL_UNLK_ACCURACY_PPM=1
    sDPLL_UNLK_AVG=10
    sDPLL_UNLK_PPM=10
    sDPLL_er_fn_offset=1
    sDPLL_er_fn_value=-42.99
    sDPLL_tr_fn_offset=100
    sDPLL_tr_fn_value=-3.03
    sMAX_TDC_freq=26000000
    sMAX_TDC_simple=1
    sPRIREF_ACCURACY_PPM=5
    sPRIREF_AVG_COUNT=2
    sPRIREF_EARLY_MARGIN=0
    sPRIREF_EARLY_calc=94.40 ns
    sPRIREF_LATE=0
    sPRIREF_LATE_MARGIN=0
    sPRIREF_LATE_calc=104.00 ns
    sPRIREF_PH_VALID_calc=n/a; PRIREF > 2 kHz
    sPRIREF_PPM_INVALID=26
    sPRIREF_PPM_TIMER=8.33 ms
    sPRIREF_PPM_VALID=20
    sPRIREF_freq=25000000
    sSECREF_ACCURACY_PPM=5
    sSECREF_AVG_COUNT=2
    sSECREF_EARLY_MARGIN=0
    sSECREF_EARLY_calc=35.20 ns
    sSECREF_LATE=0
    sSECREF_LATE_MARGIN=0
    sSECREF_LATE_calc=44.80 ns
    sSECREF_PH_VALID_calc=n/a; SECREF > 2 kHz
    sSECREF_PPM_INVALID=26
    sSECREF_PPM_TIMER=8.33 ms
    sSECREF_PPM_VALID=20
    sSECREF_freq=25000000
    sSYNC_PHASE_OFFSET=0.0e-15
    sVCO1_freq=25000000*100*1
    sVCO2_freq=0
    sXO_freq=48004800
    stDPLL_PL_LPF_COEFF=DPLL_PL_LPF_COEFF\ncan be 0
    ADDR_249=
    ADDR_250=
    ADDR_251=
    ADDR_252=
    NVM_ERASE_PROG=0
    REGCOMMIT_PG=0
    bEXPORTEEPROMFILE=Export GUI Map --> EEPROM File
    bIMPORTEEPROMFILE=(1b) Import EEPROM File --> GUI Map
    bLoadDefaultEEPROMImageToGUIMap=(1c) Load Default EEPROM Image --> GUI Map
    bLoadPage_from_GUIMap_to_GUI_Registers=Load GUI Map PAGE --> Register
    bPROGRAMEEPROM=(3) Program EEPROM <-- SRAM
    bREADBACKEEPROM=Read All EEPROM --> GUI Map
    bREADBACKROM=Read All ROM --> GUI Map
    bREADBACKSRAM=Read All SRAM --> GUI Map
    bREG2EE=(1a) Commit Registers --> SRAM PAGE/GUI Map
    bUpdate_ExtraEEPROM_Bytes=Read Extra\nEEPROM Bytes
    cbEESLAVEADR=0
    mtc_EEPROMdump=0
    mtc_USERNOTES=Enter User Notes
    tc_DESIGNNAME=Enter Design Name
    PLL1_DEN=1099511627776
    PLL1_PFD_freq=24.0024
    VCO1_freq=2500
    XO_freq=48.0048
    PLL2_DEN=16777216
    PLL2_PFD_freq=138.888888888889
    VCO1_freq=2500
    VCO2_freq=0
    XO_freq=48.0048
    bClearAllFlagStickyStatus=Clear All Flags
    bReadStatus=Read Status
    MUTE_DPLL_FRLOCK=0
    OUT0_freq=25
    OUT1_freq=25
    OUT2_freq=156.25
    OUT3_freq=156.25
    OUT4_freq=156.25
    OUT5_freq=156.25
    OUT6_freq=156.25
    OUT7_freq=156.25
    PLL2PDIV1_freq=0
    PLL2PDIV2_freq=0
    VCO1_freq=2500
    VCO2_freq=0
    sOUT7_DIV=16
    CH0_PREDRIVER=0
    CH1_PREDRIVER=0
    CH2_PREDRIVER=0
    CH3_PREDRIVER=0
    CH4_PREDRIVER=0
    CH5_PREDRIVER=0
    CH6_PREDRIVER=0
    CH7_PREDRIVER=0
    DPLL_REF_LOOPCTL_CHG_QUANT_INTG=0
    PLL1_BAW_CAPDAC=0
    PLL1_CP_TRIM=0
    PLL1_IGNORE_GPIO_PIN=0
    bFindAddressBtn=Find I2C Addr
    i2cAddr=0
    

  • It is expected. When you removed REF, LMK05318 entered holdover, output clocks follows with XO, even though the tuning word is fixed, but XO is in drift, so the phase can't be aligned with original REF, because the output frequency always has some difference for REF and XO.