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Sipex DAC 9377-16 no longer sold, but TI DAC712 will serve

Discussion in 'Electronic Repair' started by William Beaty, May 29, 2013.

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  1. The Sipex DAC9377-16-4 has a strange aging problem: resistors in the ladderwill drift in value until the analog output is not only non-linear, but entirely crazy.

    :)

    DAC 9377 is common in hospital NMR, military simulators, and older custom research instruments. (If it ran any proportional hydraulics in manned simulators, they'd be in for an increasingly rough ride over the years.) The old chips are expensive if you can find them at all, and of course may suffer the same aging problem.

    So, build yourself an adapter-board to match Texas Inst DAC712 pinout. Seelink below. Needs one signal inverted, pullup/gnd of mode pins, and zero/gain trimmers on board. See:

    http://staff.washington.edu/wbeaty/chem_sipex9377.html
     
  2. N_Cook

    N_Cook Guest

    The Sipex DAC9377-16-4 has a strange aging problem: resistors in the ladder
    will drift in value until the analog output is not only non-linear, but
    entirely crazy.

    :)

    DAC 9377 is common in hospital NMR, military simulators, and older custom
    research instruments. (If it ran any proportional hydraulics in manned
    simulators, they'd be in for an increasingly rough ride over the years.)
    The old chips are expensive if you can find them at all, and of course may
    suffer the same aging problem.

    So, build yourself an adapter-board to match Texas Inst DAC712 pinout. See
    link below. Needs one signal inverted, pullup/gnd of mode pins, and
    zero/gain trimmers on board. See:

    http://staff.washington.edu/wbeaty/chem_sipex9377.html


    +++++
    ah! , fuzzy logic
    So what is the reason for the Rs drifting? surely not heat-induced chemical
    change which is the usual reason.
     
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