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Help identifying an IC

Discussion in 'Datasheets, Manuals and Component Identification' started by iTQAN, Dec 19, 2013.

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  1. iTQAN

    iTQAN

    3
    0
    Dec 19, 2013
    I need to find a replacement or specs for the IC thats shown in the attached image.

    Here's the details:

    I'm working on repairing a controller circuit for a frequency up-convertor. I replaced 2 voltage regulators and that fixed the problem partially. The circuit runs for 10 minutes and then alarms with power supply fault (not a hard fault). I traced the problem and I found that the IC shown on the attached image is faulty. I researched the numbers on the IC with no luck finding any info. Any help, tips or ideas to help me out find a suitable replacement would be much appreciated.
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Without assuming any warranty, it could be this part: DS1809
     
  3. iTQAN

    iTQAN

    3
    0
    Dec 19, 2013
    I'm going to call them tomorrow to verify the numbers. Thank you very much.

     
  4. davenn

    davenn Moderator

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    1,956
    Sep 5, 2009
    can you verify that the top left pin ( in your pic) goes to supply ... should be 5V + - 0.5 V .... that will possibly confirm it being a DS1809

    What makes you think that that chip is faulty ?

    Do you have a good understanding of the circuit ? would a DS1809 digital potentiometer be a realistic IC to be in that position ?

    cheers
    Dave
     
  5. iTQAN

    iTQAN

    3
    0
    Dec 19, 2013
    Hi Dave,

    I have 3 of them on the circuit and 2 are suspected faulty. The first one works as a digital potentiometer controlling L2941LD surface mount. This one has thermal issue it faults below the specs temp.

    Here's a similar digram: http://www.maximintegrated.com/app-notes/index.mvp/id/183

    The other one I'm not sure what it does. I didn't have enough time to examine it fully, but pin 1 should show voltage of ~1.25 and thats what I'm seeing on the other 2 DS1809, instead of being shorted to the ground. I'll do more digging and measuring on Monday.

    I also contacted Maxim Integrated and am waiting for them to get back to me to verify letter x on the first line and the numbers on the 2nd line.

    Thanks,

    Ahmed


     
  6. davenn

    davenn Moderator

    13,865
    1,956
    Sep 5, 2009
    OK cool

    thanks for that link ---- informative :)

    Dave
     
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