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Help with AD75019

Discussion in 'General Electronics' started by guy, Jun 4, 2004.

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  1. guy

    guy Guest

    Hi all,

    I am trying to use the 16x16 analog switch matrix part #AD75019 from
    ANALOG DEVICES. I am controlling it using a PIC. The problem is,
    regardless of what I put on SIN, SOUT is stuck HI. Is there some sort
    of precharge sequence to initialize the connections? this is very
    important to my project and I would appriciate any help at all.

    Thanks in advance
  2. I've never used this AD chip but looking at the data sheet, the shift
    register is dynamic and requires a minimum 20 KHz clock rate. Are you
    achieving this rate? Then there is always the possibility of ESD
    failure. Have you looked at the SCLK and PCLK pins with a scope to see
    what is really there? I don't think using a meter to look at SOUT will
    be useful. Just a thought.
  3. guy

    guy Guest

    Yea, I've looked at PCLK, SCLK, and SIN, and the data and timing is
    correct... unfortunately the switches aren't taking their right
    values, and the SOUT is stuck hi.

    clock rate is 2MHz, so that's not the problem.

    Any other thoughts?

  4. Are you really getting a 2MHz clock into the AD? Did you send at least
    256 bits so that SOUT becomes active? Did you ping PCLK within 5mS to
    transfer into the static latches? Barring chip failures from poor
    handling, I've never had an AD chip that did not work as stated.
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