TAS3103 datasheet(35/146 Pages) TI

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2−3

2.1

Input and Output Serial Audio Ports (SAPs)

The TAS3103 accepts data in various serial data formats including left/right justified and I2S, 16 through 32 bits,

discrete, or TDM. Sample rates from 8 kHz through 96 kHz are supported. Each TAS3103 has four input serial ports

and three output serial ports, labeled SDIN[4:1] and SDOUT[3:1] respectively. All ports accommodate stereo data

formats, and SDIN1 and SDOUT1 also accommodate time-division multiplex (TDM) data formats. The formats are

selectable via I2C commands. All input channels are assigned the same format and all output channels are assigned

the same format; and the two formats need not be the same. The TAS3103 can accommodate system architectures

that require data format conversions without the need for additional glue logic. If a TDM format is selected for the input

port, only SDIN1 is active; the other three input channels cannot be used. If a TDM format is selected for the output

port, only SDOUT1 is active; the other two channels cannot be used.

2.1.1

SAP Configuration Options

The TAS3103 serial interface data format options for discrete (stereo) data are detailed in Figure 2−2.

Left / Right

Justified

LRCLK

SCLK

MSB−1

LSB

Left Justified

LSB

LSB+1

Right Justified

LSB

LSB+1

Bit 31

Bit 0

Bit 31

Bit 0

Bit 31

SCLK

LSB

Bit 0

Bit 31

MSB

Bit 0

SCLK

Bit 31

Bit 0

Bit 31

Bit 0

MSB

I2S

MSB−1

MSB

MSB−1

MSB

MSB−1

MSB

MSB−1

MSB

LSB+1

LSB

LSB+1

MSB−1

MSB

MSB−1

MSB

Figure 2−2. Discrete Serial Data Formats

When the TAS3103 is transmitting serial data, it uses the negative edge of SCLK to output a new data bit. The

TAS3103 samples incoming serial data on the rising edge of SCLK.

The TDM modes on the TAS3103 only provide left justified and I2S formats, and each word in the TDM data stream

adheres to the bit placement shown in Figure 2−2. Figure 2−3 illustrates the output data stream for a 4-channel TDM

mode. Two cases are illustrated; an I2S data format case (SAP output mode 1010) and a left-justified data format case

(SAP output mode 0111).

MSB−1

LSB

MSB

Left

LRCLK

Data

LRCLK

Data

Justified

MSB

MSB−1

MSB

MSB−1

MSB

MSB−1

MSB

LSB

MSB−1

MSB

I2S

Left Channel 1

Left Channel 2

Right Channel 1

Right Channel 2

Left Channel 1

Left Channel 2

Right Channel 1

Right Channel 2

MSB−1

MSB

MSB−1

MSB

MSB−1

MSB

Figure 2−3. Four-Channel TDM Serial Data Formats

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