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CDCE6214: Design question & Schematic check

Ryan Lee TW
Intellectual 666 points
Part Number: CDCE6214
Other Parts Discussed in Thread: LMK3H0102

Tool/software:

Hi Teams,

My customer is wondering Is it possible to set CDCE6214 to output 2MHZ on Y1P and 32kHz on Y4P at the same time?

Is there any setting that you can refer to us?

And could you help to double check for the schematic?

Thanks.

  • 0
    TI__Expert 6055 points

    Ryan,

    Could you provide an image of the schematic on the other side of the CDCE6214 as well?

    Yes, the CDCE6214 can meet your request. Attached is a hex file with that config, assuming you are using a 25 MHz XTAL input.

    Fullscreen 2MHzand32kHz_HexRegisterValues.txt Download 
    R85	0x00550000
R84	0x00540000
R83	0x0053FB00
R82	0x005205C0
R81	0x00510004
R80	0x00500000
R79	0x004F0208
R78	0x004E1000
R77	0x004D0000
R76	0x004C0008
R75	0x004B4008
R74	0x004AA181
R73	0x00491000
R72	0x00483921
R71	0x00470000
R70	0x00460008
R69	0x0045A181
R68	0x00443000
R67	0x00433921
R66	0x00420000
R65	0x00410008
R64	0x0040A181
R63	0x003F3000
R62	0x003E0019
R61	0x003D0000
R60	0x003C0008
R59	0x003B2008
R58	0x003A502C
R57	0x00391000
R56	0x003800EA
R55	0x0037001E
R54	0x00363400
R53	0x00350069
R52	0x00345000
R51	0x003340C0
R50	0x003201C0
R49	0x00310013
R48	0x00302201
R47	0x002F00A8
R46	0x002E0000
R45	0x002D4F80
R44	0x002C0318
R43	0x002B0051
R42	0x002A0002
R41	0x00290000
R40	0x00280000
R39	0x00270000
R38	0x00260000
R37	0x00250000
R36	0x00240000
R35	0x00230055
R34	0x00220000
R33	0x0021C350
R32	0x00200000
R31	0x001F7530
R30	0x001E005D
R29	0x001D0000
R28	0x001C0000
R27	0x001B0007
R26	0x001A0000
R25	0x00190401
R24	0x00180C14
R23	0x00172406
R22	0x001600A2
R21	0x0015050F
R20	0x00140000
R19	0x00130000
R18	0x00120000
R17	0x001126C4
R16	0x0010921F
R15	0x000F5037
R14	0x000EC59E
R13	0x000D003F
R12	0x000C6B62
R11	0x000B003F
R10	0x000A6B62
R9	0x00096B62
R8	0x00080001
R7	0x00070C0F
R6	0x000611AC
R5	0x00050008
R4	0x00040060
R3	0x00030200
R2	0x00020002
R1	0x00012310
R0	0x00001000

    Best,

    Cris

  • 0 in reply to Cris Kobierowski
    Intellectual 666 points

    Hi Cris,

    Please see the attached.

    Another question, customer is wondering is it possible to set output Y1P=8192K(8.192M) and Y4P=4000K(4M) at the same time?

  • +1 in reply to Ryan Lee TW
    TI__Expert 6055 points

    Ryan,

    The schematic looks good, but REFN can be left floating.

    Unfortunately, this part cannot produce both 8.192 and 4 MHz at the same time, as they do not have a common multiple within the VCO range. The LMK3H0102 can fulfill this need and does not require an external reference input.

    Best,

    Cris

  • +1 in reply to Cris Kobierowski
    TI__Expert 6055 points

    Ryan,

    Alternatively, if you use a 32.768 MHz xtal, you can use the CDCE6214 to produce your desired frequencies. 

    Best,

    Cris