AIC3106 Data Format

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

?