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SERIAL AUDIO DATA INTERFACE

DATA FORMAT

16-Bit, MSB-First, Left-Justified

BCK

LRCK

Right-Channel

Left-Channel

DOUT

1

14 15 16

3

2

1

MSB

LSB

MSB

LSB

14 15 16

3

2

1

LRCK

Right-Channel

Left-Channel

BCK

DOUT

MSB

LSB

MSB

LSB

16-Bit, MSB-First, I2S

FMT = H

14 15 16

3

2

1

14 15 16

3

2

1

FMT = L

T0016-03

PCM1801

SBAS131C – OCTOBER 2000 – REVISED JULY 2007

The PCM1801 interfaces the audio system through BCK (pin 6), LRCK (pin 7), and DOUT (pin 8).

The PCM1801 accepts 64-BCK/LRCK, 48-BCK/LRCK (only for a 384-fS system clock) or 32-BCK/LRCK format

for the left-justified format. And the PCM1801 accepts the 64-BCK/LRCK or 48-BCK/LRCK format (only for a

384-fS system clock) for I

2S format.

The PCM1801 supports two audio data formats in slave mode, which are selected by the FMT control input

(pin 10) as shown in Table 3. Figure 25 illustrates the data format. If the application system cannot ensure an

effective system clock prior to power up of the PCM1801, the FMT pin must be held LOW until the power-on

reset sequence is completed. In this case, if the I2S format (FMT = HIGH) is required in the application, FMT can

be set HIGH after the power-on reset sequence is completed.

Table 3. Data Format

FMT

DATA FORMAT

0 (L)

16-bit, left-justified

1 (H)

16-bit, I2S

Figure 25. Audio Data Format

14

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