Voltage shifting

Discussion in 'The Projects Forum' started by patheticz, Jan 4, 2010.

  1. patheticz

    Thread Starter New Member

    Nov 3, 2009
    28
    0
    Hi, i am currently trying to design an interface between an ADC having input range of 0-3V with a sensor output range of -3 to 3V, and a -0.6 to 0.6V.
    I was told i needed an amplifier and a level shifting circuit. Is it so?
    How does a level shifting circuit work? does it just shift the entire set of voltage readings up?

    Is there any alternative methods?

    Thanks
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Have a look at the summing circuits section of our E-book:
    http://www.allaboutcircuits.com/vol_3/chpt_8/8.html

    Using an opamp with a resistive summing circuit is a good idea, as the output of the opamp will provide a low impedance source for your ADC.

    If you only have a single supply voltage available, you will either need to use a rail-to-rail input and output opamp, or at least one that can read inputs down to ground and output to ground.

    If you have dual rails (positive and negative supplies) you can use a much wider variety of opamps.

    But without knowing more specifics about your situation, all we can do is present some general information.
     
  3. patheticz

    Thread Starter New Member

    Nov 3, 2009
    28
    0
    is there a difference between summing circuti and level shifting?

    anyway, my design has changed slightly.
    i am taking readings using a transducer and the readings are ranging from -2.5 to 2.5V. However, my ADC can only take in values from 0-5V.
    What must i do to interface the two together?
     
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