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, I2S, 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

VOUT1

DATA1

Right

VOUT2

Left

VOUT3

DATA2

Right

VOUT4

Left

VOUT5

DATA3

Right

VOUT6

Left

VOUT7

DATA4

Right

VOUT8

14

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