PCM3010

SLES055 – NOVEMBER 2002

24

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PCM audio interface

Digital audio data is interfaced to the PCM3010 on LRCK (pin 10), BCK (pin 11), DIN (pin 12), and DOUT

(pin 13). The PCM3010 can accept the following 16-bit and 24-bit formats. These formats are selected through

FMT0 (pin 7) and FMT1 (pin 8), as shown in Table 2.

Table 2. Audio Data Format Select

FMT1

FMT0

DAC DATA FORMAT

ADC DATA FORMAT

LOW

LOW

24-bit, MSB-first, right-justified

24-bit, MSB-first, left-justified

LOW

HIGH

16-bit, MSB-first, right-justified

24-bit, MSB-first, left-justified

HIGH

LOW

24-bit, MSB-first, left-justified

24-bit, MSB-first, left-justified

HIGH

HIGH

24-bit, MSB-first, I2S

24-bit, MSB-first, I2S

The PCM3010 accepts two combinations of BCK and LRCK, 64 or 48 clocks of BCK in one clock of LRCK. The

following figures illustrate audio data input/output format and timing.

FORMAT 0: FMT[1:0] = 00

DAC: 24-Bit, MSB-First, Right-Justified

LRCK

Right Channel

Left Channel

BCK

DIN

24

22 23 24

3

2

1

MSB

LSB

22 23 24

3

2

1

MSB

LSB

ADC: 24-Bit, MSB-First, Left-Justified

BCK

LRCK

Right Channel

Left Channel

DOUT

1

22 23 24

3

2

1

MSB

LSB

22 23 24

3

2

1

MSB

LSB

FORMAT 1: FMT[1:0] = 01

LRCK

Right Channel

Left Channel

BCK

DIN

16

14 15 16

3

2

1

MSB

LSB

14 15 16

3

2

1

MSB

LSB

DAC: 16-Bit, MSB-First, Right-Justified

ADC: 24-Bit, MSB-First, Left-Justified

BCK

LRCK

Right Channel

Left Channel

DOUT

1

22 23 24

3

2

1

MSB

LSB

22 23 24

3

2

1

MSB

LSB

Figure 47. Audio Data Input/Output Format