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AIC3106 Data Format

Hoffiz
Expert 1670 points


I'm running the example from Spectrum Digital that runs a test for the AIC3106. The create an array of constants that generates a sine tone. The examples is configuring the AIC 3106 for:

EVMOMAPL137_AIC3106_rset( 8, 0x00 ); // 8 Audio Interface Control A <- [BCLK=Slave][MCLK=Slave]
EVMOMAPL137_AIC3106_rset( 9, 0x00 ); // 9 Audio Interface Control B <- [I2S mode][16 bit]

pardon the rookie question but how are those 16 bits related to full scale. Is it +/- FS -> 32767 to - 32767 or 0 to 65535

?

  • 0
    TI__Mastermind 35645 points

    Hi,

    Thanks for your post.

    To make us more clear in our understanding, Fs is the sampling frequency where the audio data is usually sampled @48KHz and it has the possibility to take the values ranging from 0 to 65535 (0xFFFF) but for sure, the values –32768 to 32767 are unrealisitic for Fs.

    Secondly, if I understand correctly, the 16-bit audio data in I2S mode uses the ADC left and right channel filter coefficients which can be intrepreted as 2's complement 16-bit signed integer which can hold the possible values ranging from –32768 to 32767. For more details, you could refer page1, registers 1- 76 from the AIC3106 codec datasheet below, in which they have used th ADC stereo channel filter coefficients interpreted in 2's complement signed integers.

    http://www.ti.com/lit/ds/symlink/tlv320aic3106.pdf

    Thanks & regards,

    Sivaraj K

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