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AIC34 codec microphone preamp

Andy Wong
Prodigy 60 points
Other Parts Discussed in Thread: TLV320AIC34

Does anyone know the gain of the analog mic preamp in AIC34 codec? I cannot find it anywhere in the data sheet. Is there a difference between LINE and analog microphone total gain? In other words, are the two input types interchangeable? The data sheet mentions Microphone Preamplifier once so I assume the microphone input has additional gain, but I cannot verify it. Thanks.

  • 0
    TI__Guru**** 189401 points

    Hi, Andy,

    I'm not sure if we've ever met, but I've visited you guys a couple times years ago.

    Isn't this described on page 2 of the d/s, second paragraph?

    The four-channel audio DAC supports sampling rates from 8 kHz to 96 kHz and includes programmable digital
    filtering in each path for 3D, bass, treble, midrange effects, speaker equalization, and de-emphasis for 32-kHz,
    44.1-kHz, and 48-kHz rates. The four-channel audio ADC supports sampling rates from 8 kHz to 96 kHz and is
    preceded by programmable gain amplifiers providing up to 59.5-dB analog gain for low-level microphone inputs.
    The TLV320AIC34 provides an extremely high range of programmability for both attack (8–1,408 ms) and for
    decay (0.05–22.4 seconds). This extended AGC range allows the AGC to be tuned for many types of
    applications.

    Looking at the block diagram on page 3, it looks like the line inputs have the option of bypassing all the A/D and D/A and be fed directly to the analog output mixer.

    -d2