AKD4635 datasheet(15/81 Pages) AKM

15 / 81 page

[AK4635]

Rev. 0.6

2007/10

- 15 -

Parameter

Symbol

min

typ

max

Units

EXT Master Mode (Figure 6)

MCKI Frequency: 256fs

512fs

1024fs

Pulse Width Low

Pulse Width High

fCLK

tCLKL

tCLKH

1.8816

3.7632

7.5264

0.4/fCLK

2.048

4.096

8.192

12.288

13.312

MHz

FCK Frequency (MCKI = 256fs)

(MCKI = 512fs)

(MCKI = 1024fs)

Duty Cycle

fFCK

dFCK

7.35

kHz

BICK: Period (BCKO1-0 bit = “00”)

(BCKO1-0 bit = “01”)

(BCKO1-0 bit = “10”)

Duty Cycle

tBCK

dBCK

1/16fFCK

1/32fFCK

1/64fFCK

Audio Interface Timing

DSP Mode: (Figure 7, Figure 8)

FCK “

↑” to BICK “↑” (Note 29)

FCK “

↑” to BICK “↓” (Note 30)

BICK “

↑” to SDTO (BCKP bit = “0”)

BICK “

↓” to SDTO (BCKP bit = “1”)

SDTI Hold Time

SDTI Setup Time

tDBF

tBSD

tSDH

tSDS

0.5 x tBCK

−40

0.5 x tBCK

−40

−70

0.5 x tBCK

0.5 x tBCK + 40

0.5 x tBCK +40

Except DSP Mode: (Figure 9)

BICK “

↓” to FCK Edge

FCK to SDTO (MSB)

(Except I2S mode)

BICK “

↓” to SDTO

SDTI Hold Time

SDTI Setup Time

tBFCK

tFSD

tBSD

tSDH

tSDS

−40

−70

Note 28. Duty Cycle = (the width of “L”)/(the period of clock)*100

Note 29. MSBS, BCKP bits = “00” or “11”

Note 30. MSBS, BCKP bits = “01” or “10”

Note 31. BICK rising edge must not occur at the same time as FCK edge.

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