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Analog switch

Discussion in 'Electronic Basics' started by Roman Arnet, Sep 23, 2004.

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  1. Roman Arnet

    Roman Arnet Guest

    Hi
    I'm looking for a solution to switch two audio channels. The channels
    are in the range of 0..3V and 0..-3V. The distortion should be < 0.03%
    and crosstalk < 90dB.

    Ch0+ ---
    ---- CH0+ or CH1+
    Ch1+ ---

    Ch0- ---
    ---- CH0- or CH1-
    Ch1- ---
    The use of relay is not possible due to their power dissipation.
    Any suggestions?
    Thanks
    Roman
     
  2. I have not used this chip for audio but have had excellent results
    with video
    http://www.analog.com/UploadedFiles/Data_Sheets/12075248AD8180_2_b.pdf
    There is also a 4-1 selector AD8184.

    For audio it may not have enough headroom since audio folks have a
    habit of sloppy level control. Now that I offended audio people, video
    levels are far more consistent even across consumer formats.

    Switching video requires gain/offset/timing matching. Not difficult
    but required for no breakup.
    gg
     
  3. Dan Fraser

    Dan Fraser Guest

    Nothing beats relays for low distortion. And there are some that only draw a
    few tens of milliwatts. Otherwise, do a search for "Analog Switches". There
    are dozens if not hundreds to choose from.
     
  4. Roman Arnet

    Roman Arnet Guest

    I'm wondering about the datasheets of CMOS switches. I've got data about
    THD+N, crosstalk and many others. What I'm missing here is the noise
    produced by the CMOS technology.
    My microphone singnals will be around 500uV (or even less)! I really
    don't know how how much noise I can estimate from CMOS switches.
    Roman
     
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