Comparator's output

Discussion in 'General Electronics Chat' started by vks_foe, Feb 13, 2009.

  1. vks_foe

    Thread Starter Well-Known Member

    Jan 11, 2009
    61
    7
    hi,
    i've a doubt. Comparators require +ve and -ve power supplies to work. If a ckt has only positive power supply and if i connect the negative power supply pin of comparator to ground of ckt., will it work properly?
     
  2. flat5

    Active Member

    Nov 13, 2008
    403
    18
    Look at the data sheet for the device.
     
  3. Bailey45

    Member

    Oct 27, 2008
    18
    0
    A LM339 is a single supply comparitor. Again check the data sheets.
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    65
    It depends if the comparator can work with a single supply and what signal you want to compare.
     
  5. vks_foe

    Thread Starter Well-Known Member

    Jan 11, 2009
    61
    7
    Ok.. LM339 does have a single power supply...But what abt LM319?? it has V+, V- as well as GND pins.. Can u explain?
     
  6. flat5

    Active Member

    Nov 13, 2008
    403
    18
  7. vks_foe

    Thread Starter Well-Known Member

    Jan 11, 2009
    61
    7
  8. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,049
    657
    Look at the Input Voltage Range spec on the datasheet. If your input voltage is 1V or more above GND, you can connect the V- pin to GND. If your input range is lower than +1V, you will need a negative supply for V-.
    The high limit on the input range is dependent on V+, also specified in the datasheet. You will need a pullup resistor from the output to some positive voltage less than +36V.
     
  9. flat5

    Active Member

    Nov 13, 2008
    403
    18
Loading...