ISD1110 "SP+" goes to LM386N-3 "IN-" ? Is this right?

Discussion in 'General Electronics Chat' started by xnihilo, Jan 6, 2009.

  1. xnihilo

    Thread Starter Active Member

    Nov 20, 2008
    33
    0
    Hello.

    When using a differential input in LM386N-3 from an output from ISD1110P, it seems that the SP- goes to lm386 IN+ and, the SP+ goes to the IN-.
    This is found in the ISD1110P datasheet, is there an error or is this correct, and why?

    Thanks for any comments.
     
  2. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    please post the datasheet
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The speaker outputs of the voice recorder IC ISD1110 have a DC voltage.
    The inputs of the LM386 amplifier must be at 0VDC and have a resistor to 0V inside.
    So use a 0.1uF coupling capacitor from each speaker output of the voice recorder IC to each input of the LM386 amplifier.
     
  4. xnihilo

    Thread Starter Active Member

    Nov 20, 2008
    33
    0
    In fact this relates to LM386 datasheet, ISD1110P datasheet and some WINBOND Application notes.

    This configuration is when you connect differentialy the ISD1110P SP+ and SP- to LM386 IN+ and IN-.
     
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