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HTL to TTL conversion

Discussion in 'Electronic Design' started by Mike, Aug 25, 2007.

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  1. Mike

    Mike Guest

    I have a draw wire displacement sensor which works at HTL logic
    levels.

    The supply voltage for the sensor will be 12V and I need to translate
    the outputs to 0..5V levels suitable for decoding with an HCTL-2022
    quadrature decoder.

    Would a 74HC4050 be a good choice or is there a better alternative?

    Thanks,
    Mike
     
  2. Jim Thompson

    Jim Thompson Guest

    Lots of missing info:

    HTL logic level... what levels? Seems a "non-standard" "standard"

    Speed? If slow, just use a comparator.

    ...Jim Thompson
     
  3. Mike

    Mike Guest

    Hi Jim,

    I'm not sure about the "levels" for HTL - I have searched but not
    turned up anything useful. The outputs are square waves 0 to 11.9V

    There are 3 signals - A,B and Index and the maximum frequency will be
    200 KHz.

    Mike
     
  4. Fred Bloggs

    Fred Bloggs Guest

    If you are certain about those output levels then you can use the 74HC4050.
     
  5. Can't we do something more interesting here?
    For example, for a nice HTL logic threshold,
    near 6V, we could use a PNP transistor in a
    level-shifter stage with a 6V-threshold:

    2.7k
    in ----/\/\----,
    0/12 | pnp
    e\|
    |--- +5
    /|
    2.2k |
    gnd ---/\/\----+----- out 0/5
     
  6. Jim Thompson

    Jim Thompson Guest

    Yep, that'll do it. Looks like it's sized to have a relatively low
    input threshold to accommodate quite a range of input levels.

    ...Jim Thompson
     
  7. Jim Thompson

    Jim Thompson Guest

    Sure, use 18 components, when one will do ;-)

    ...Jim Thompson
     
  8. Tim Williams

    Tim Williams Guest

    So how many components are there in that single chip Fred recommended hmmm?

    Tim
     
  9. Jim Thompson

    Jim Thompson Guest

    Which would you rather assemble ?:)

    ...Jim Thompson
     
  10. Fred Bartoli

    Fred Bartoli Guest

    Le Sun, 26 Aug 2007 10:53:09 -0700, Jim Thompson a écrit:

    The former. There's no assembly to speak about for *one* component.
     
  11. I said it was more interesting, as opposed to
    _boring_ and if we're counting, that's three
    channels or 9 parts, not 18. And that's a 6V
    threshold, instead of 1.35V (worst-case) for
    the hc4050, improving signal noise immunity
    by over 4x.

    Nine components with 21 solder connections,
    instead of sixteen. OK, that's 31% more.

    Sure I'd use the '4050 (hey, it's an oldtime
    favorite of mine and tens of thousands were
    used in my designs years ago), but I'd first
    cast an admiring glance at alternate ideas.
     
  12. MikeG

    MikeG Guest

    On Sun, 26 Aug 2007 07:51:08 -0700, Jim Thompson

    Thanks to all who replied.

    Regards,
    Mike
     
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