• AD9281 problem

    I have a circuit that uses an AD9281

    If I connect VREF/2 to both inputs I should get code 128 out.

    For channel 1 I am getting 128 + 16 and for channel 2 I am getting 128 + 32

    VREFB is 1 volt and VREFT is 2.5 volts

    I suspect something wrong wit VREFT as…

  • RE: Strange things with AD9281

    I got stuck into the various problems with my system.

    1/ My op amp circuit was too close to the PIC clock circuit and was picking up 8MHz.

    2/ AD9283 required better decoupling.

    3/ The /AIN pin is not biased centrally and I had to put an extra resistor…

  • RE: AD9288 - Common Mode Input Range

    Hi AlexB,

    You're calculations seem to be correct, and are consistant with both the Spec table on Analog Inputs (page 3 ) and the text on page 14.

    The common mode range si set by the input design, and departing from it will result in significant…

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