Datasheet

AUDIO DATA FORMATS AND TIMING
PCM1680
SLES133B – MARCH 2005 – REVISED OCTOBER 2008 .................................................................................................................................................. www.ti.com
The PCM1680 supports industry-standard audio data formats, including right-justified, I
2
S, and left-justified. The
data formats are shown in Figure 22 . Data formats are selected using the format bits, FMT[2:0], located in control
register 9 of the PCM1680. The default data format is 24-bit left-justified. All formats require binary twos
complement, MSB-first audio data. Figure 22 shows a detailed timing diagram for the serial audio interface.
DATA1, DATA2, DATA3, and DATA4 each carry two audio channels, designated as the left and right channels.
The left-channel data always precedes the right-channel data in the serial data stream for all data formats.
Table 2 shows the mapping of the digital input data to the analog output pins.
Table 2. Audio Input Data to Analog Output Mapping
DATA INPUT CHANNEL ANALOG OUTPUT
Left V
OUT
1
DATA1
Right V
OUT
2
Left V
OUT
3
DATA2
Right V
OUT
4
Left V
OUT
5
DATA3
Right V
OUT
6
Left V
OUT
7
DATA4
Right V
OUT
8
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