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LM49352: LM49352 MIC+ Input range

shuang Cao
Intellectual 385 points
Part Number: LM49352


I want to know the Input range of MIC+.  We test the MIC+ input audio signal is sinusoidal, frequency is 400Hz~500Hz, amplitude varies from -4V to +2V. The input signal is very large, and I wonder if the chip supports it.

  • 0
    TI__Mastermind 30220 points
    Shuang,

    A 6V swing is too large. keep in mind that first of all, The full scale mic input is 1.8V. Then note that the ABS MAX for AVDD is 6V,
    I don't know if your signal has a common mode offset, but regardless, if your common mode voltage on the Input pins is 1.8-2V then your input voltage will push the pin negative. Typically the input should never go below -0.3V.
    best regards,
    -Steve Wilson