How to get a single ended output

Discussion in 'General Electronics Chat' started by dumindu89, Jun 6, 2012.

  1. dumindu89

    Thread Starter Member

    Oct 28, 2010
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    0
    I need to get a single ended output from the MAX2606 VCO IC instead of differential output.
    Can anyone one confirm that the configuration shown in following figure is correct or not?
    If not please let me know the correct configuration.

    MAX2606 datasheet:http://datasheets.maxim-ic.com/en/ds/MAX2605-MAX2609.pdf

    [​IMG]
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    Your circuit diagram does not show R1 and R2 connected to VCC.
    Make sure R1 and R2 are connected to VCC.
    I do not know if R2 is required. You can try omitting R2.
     
  3. dumindu89

    Thread Starter Member

    Oct 28, 2010
    113
    0
    Thanks.
    According to the datasheet, for the differential output the two resistors are used as pull up resistors. What does that mean?
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    It means that the outputs are open-collector,
    that is, the transistor's collector has not been connected,
    and it has been left up to the designer to provide their own external load.

    This is true regardless of if you use differential or singled-ended output.
     
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  5. dumindu89

    Thread Starter Member

    Oct 28, 2010
    113
    0
    Then, I do not need R2 for my purpose.
     
  6. crutschow

    Expert

    Mar 14, 2008
    13,004
    3,232
    The differential output stage may need the bias current from both outputs for proper internal bias of the circuit. I would add both resistors even if you take the output from only one.
     
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