DF1706

8

SBAS182

AUDIO OUTPUT INTERFACE

The audio output interface includes BCKO (pin 26), WCKO

(pin 25), DOL (pin 24), and DOR (pin 23).

BCKO is the output bit clock and is used to clock data into an

audio D/A converter, such as the PCM1704. DOL and DOR

are the left and right audio data outputs. WCKO is the output

word clock and is used to latch audio data words into an audio

D/A converter.

system clock rates.

FIGURE 6. Audio Output Data Format.

FIGURE 5. Audio Input Interface Timing.

The output data format used by the DF1706 for DOL and

DOR is Binary Two’s Complement, MSB-first, right-justified

audio data. Figures 6(a), (b), (c), and (d) show the output data

formats for the DF1706. See Figure 7 the audio output timing.

14

15

16

1

2

1/8f

S

MSB

LSB

WCKO

BCKO

AUDIO DATA WORD = 16-BIT

DOR

DOL

15

16

18

19

22

23

20

1

2

MSB

LSB

AUDIO DATA WORD = 20-BIT

DOR

DOL

19

20

24

1

2

MSB

LSB

AUDIO DATA WORD = 24-BIT

DOR

DOL

23

24

16

17

18

1

2

MSB

LSB

AUDIO DATA WORD = 18-BIT

DOR

DOL

17

18

14

15

16

1

2

1/8f

S

MSB

LSB

WCKO

BCKO

AUDIO DATA WORD = 16-BIT

DOR

DOL

MSB

15

16

18

19

22

23

20

1

2

MSB

LSB

AUDIO DATA WORD = 20-BIT

DOR

DOL

19

20

24

1

2

MSB

LSB

AUDIO DATA WORD = 24-BIT

DOR

DOL

23

24

1

2

16

17

18

1

2

LSB

AUDIO DATA WORD = 18-BIT

DOR

DOL

17

18

LRCKIN

BCKIN

D

IN

50% of V

DD

50% of V

DD

50% of V

DD

t

BCH

t

BCL

t

LB

t

BL

t

DS

t

DH

t

BCY

BCKIN Pulse Cycle Time

BCKIN Pulse Width LOW

BCKIN Pulse Width HIGH

BCKIN Rising Edge to LRCIN Edge

LRCIN Edge to BCK Rising Edge

D

D

t

BCY

t

BCL

t

BCH

t

BL

t

LB

t

DS

t

DH

82ns (min)

35ns (min)

35ns (min)

10ns (min)

10ns (min)

10ns (min)

10ns (min)