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110Mbs High speed digital isolators

Discussion in 'Electronic Components' started by JW, Jan 7, 2013.

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  1. JW

    JW Guest

    I came across these while repairing a Keithley 2001. Pretty neat device as
    it beats out opto-couplers by a factor of 10 or so.

    http://www.nve.com/Downloads/il71x.pdf

    Thought they might be of some interest.
     
  2. They're neat devices. The only weird thing is the ambigous power-on
    state, but they share that with some other isolation schemes.


    Best regards,
    Spehro Pefhany
     
  3. Tim Williams

    Tim Williams Guest

    Interesting, GMR. GMR being static, they could've made it DC stable (if
    not necessarily appealing on current consumption), but they chose to do it
    by pulse instead. GMR may be sensitive to DC fields, though they don't
    specify.

    The ADI magnetic isolators are about as fast (I think one is 50Mbps, but
    they may have up to 100, I haven't looked in detail). They're also stable
    at DC, in the presence of DC fields (basically until hall effect craps out
    the silicon itself), and have higher isolation ratings (5kV RMS short
    duration).

    This device's susceptibility appears to be about independent of frequency,
    which may be useful.

    Strange that they measure note 10: surely a PRBS with no more than 5
    consecutive digits is only a 5 bit generator, not 66,535; and surely they
    mean 65535, and surely they mean 16 bit = 65535 state, not 65535 bits?

    Tim
     
  4. Guest

    Analog Devices has had isolators similar to that for some time (e.g.
    ADUM1100). I used some of their "ISO-Power" isolators a couple years
    ago. These include an isolated power supply (150mA) and go up to
    150Mbps (e.g. ADUM5210). Quite pricey, though (they start at $5,
    IIRC).
     
  5. JW

    JW Guest

    Interesting - I hadn't realized that there were other players out there,
    this is the first time I've come across anything like these. The ADUM5210
    does not seem to be available anywhere, though. On Analogs website it's
    listed as "Product Status:pre-Release"
     
  6. Guest

    Could be. I was using the ARUM5200 (25kbps version), IIRC. I only
    needed 200Hz. ;-) There are several others on the product summary
    page, without the isolated supply, to 100Mbps. They're under a buck.
     
  7. halong

    halong Guest

  8. JW

    JW Guest

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