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adau1445 serial output data width issue

Question asked by rong on Sep 9, 2009
Latest reply on Sep 14, 2009 by BrettG

I have set adau1445 serial output line to TDM2 16bit 48Khz slave mode, and inside DSP, I'm using a Tone (Lookup/sine) block to generate 2Khz sine wave to the serial output line. From what I've probed, the serial output data is always 24 bits, i.e. the lower bits not set to 0s. According to the datasheet(rev. A),  "The output stream always has space for 24 bits of data, but if the word length is set lower, the extra bits are set as 0s.", aparently it's not what I'm seeing. Do you guys know why? Thanks.