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CDCE913 output frequency problem

Predrag Pejic55
Prodigy 150 points

Other Parts Discussed in Thread: CDCE913

Dear, 

We use CDCE913 for generate 819.2KHz from 19.2MHz. 19.2MHz we have from DTCXO oscillator. We produced over 300pcs devices but on last batch we have problem cause output frequency vary with temperature, on room temperature we have 70Hz instead of 819.2Khz, when heat or cold device frequency change and can rise up to 819.2Khz, sometimes when heat, sometimes when cold. We ordered new devices from Mouser and DIgikey but problem is same, checked on 10pcs from 200pcs of new batch. PCB, everything is same, it is standard production. We never ever had this kind of problem. Any suggestion.

Best regards,

Darko 

  • 0
    TI__Genius 10320 points
    Hi Darko,

    We are looking at your request and will get back to you soon. In the meantime, can you provide the register contents programmed into the devices as well as a schematic of the clocking portion?

    Thanks!

    Gabe
  • 0 in reply to Gabe Ayala
    Prodigy 150 points

    Hi Gabe,

    Registers are generated by Ti Clock Pro 1.2.1. You can see down. But I swapped on one board from 180pcs batch one CDCE913 from one old board may be 2 years old, so definitely problem is in chip. With old chip everything works fine. Problem is chip.   

    Bit ==> 76543210
    Byte 00 - 00000001
    Byte 01 - 00001000
    Byte 02 - 10110100
    Byte 03 - 01111110
    Byte 04 - 00000010
    Byte 05 - 01010000
    Byte 06 - 01000000
    Byte 07 - 00000000
    Byte 08 - 00000000
    Byte 09 - 00000000
    Byte 10 - 00000000
    Byte 11 - 00000000
    Byte 12 - 00000000
    Byte 13 - 00000000
    Byte 14 - 00000000
    Byte 15 - 00000000
    Byte 16 - 00000000
    Byte 17 - 00000000
    Byte 18 - 00000000
    Byte 19 - 00000000
    Byte 20 - 01101101
    Byte 21 - 00000010
    Byte 22 - 00000000
    Byte 23 - 00000000
    Byte 24 - 10101000
    Byte 25 - 00000111
    Byte 26 - 11100010
    Byte 27 - 10101000
    Byte 28 - 10101000
    Byte 29 - 00000111
    Byte 30 - 11100010
    Byte 31 - 10101000

    Darko

    Best regards,

    Darko

  • 0 in reply to Predrag Pejic55
    Prodigy 150 points

    Hi all,

    Any update for my problem. I tested all chip from 2013 and it works but new chips from Farnell and Digikey don't work. Do you have any similar registered situation?

    Best regards,

    Darko