ASAHI KASEI

[AK4525]

MS0053-E-00

2000/9

- 11 -

LRCK(i)

SCLK(i:64fs)

SDTO(o)

0

1

2

17

18

19

20

0

1

2

17

18

20

19

0

19

1

18

2

19 18

3

2

3

2

19

SDTI(i)

18

19

1

0

1

22

0

23

1

0

19:MSB, 0:LSB

Lch Data

Rch Data

Don’t Care

Don’t Care

3

32

21

21

19

10

Figure 4. Mode 2 Timing

LRCK(i)

SCLK(i:64fs)

SDTO(o)

01

2

19

17

18

20

31

0

1

2

19

17

18

20

31

0

1

19

1

19

4

3

1

SDTI(i)

31

0

31

0

19:MSB, 0:LSB

Lch Data

Rch Data

Don’t Care

Don’t Care

43

SCLK(i:32fs)

SDTO(o)

0

1

2

9

10

12

13

15

0

1

2

9

10

12

13

15

0

4

1

19

9

419

9

12 11

4

SDTI(i)

12

11

65

87

18

311

14

10

18

2

2

4

21

18

33

18

14

11

5

6

7

8

10

2

42

0

0

19 18

19 18

21

Figure 5. Mode 3 Timing

n Digital High Pass Filter

The ADC of AK4525 has a digital high pass filter for DC offset cancel. The cut-off frequency of the HPF is 0.9Hz at

fs=44.1kHz and also scales with sampling rate (fs).