voltage level shifting

Discussion in 'The Projects Forum' started by mr_computer, Jun 2, 2009.

  1. mr_computer

    Thread Starter New Member

    Feb 12, 2009
    7
    0
    Hello
    Iam new to the world of analog electronics,
    Brifly, my problem is as following:
    i want to capture a speech signal using electret microphone
    iam restricted with a circuit that consists a preamplifier and ADC
    the following is there data sheet:-
    LTC6912 Dual Programmable Gain Amplifiers with Serial Digital Interface
    http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1154,C1009,C1121,P7596,D5359
    LTC1407A-1 Serial 14-bit Simultaneous Sampling ADCs with Shutdown
    http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1155,C1001,C1158,P2420,D1295

    this circuits accepts volatge inpute range between (0.4v to 2.9v), but the output of my electret mic is approximatily between (-1v to +1v)
    also, iam restricted with a 3.3v VCC.
    so, how can i make this circuit accept the speech signal(1v p-p).
    Can any one give me a circuit with the powering cct of mic that do this task .
    please i need your help...
     
  2. mr_computer

    Thread Starter New Member

    Feb 12, 2009
    7
    0
    hello
    also without frequency distortion.
     
  3. mr_computer

    Thread Starter New Member

    Feb 12, 2009
    7
    0
    any help, please
     
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