ak4634 AKM Semiconductor, Inc., ak4634 Datasheet - Page 26

• Manufacturer Part Number: ak4634
• Description: 16-bit Mono Codec With Alc & Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

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When an external clock (12MHz, 13.5MHz, 24MHz or 27MHz) is input to the MCKI pin, the MCKO, BICK and FCK
clocks are generated by an internal PLL circuit. The MCKO output frequency is fixed to 256fs, the output is enabled by
MCKO bit. The BICK is selected among 16fs, 32fs or 64fs, by BCKO1-0 bits.
In DSP mode, FCK output can select Duty 50% or High-output only during 1 BICK cycle
FCKO bit should be set “0”.
When BICK output frequency is 16fs, the audio interface format supports Mode 0 only (DSP Mode).
Rev. 0.5
PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
Note 31. fBCK is BICK Output Frequency.
Mode
Mode
Table 9. BICK Output Frequency at Master Mode (N/A: Not available)
0
1
2
3
0
1
Table 10. FCK Output at PLL Master Mode and DSP Mode
AK4634
BCKO1
FCKO
MCKI
MCKO
BICK
FCK
SDTO
SDTI
0
0
1
1
0
1
Figure 19. PLL Master Mode
16fs, 32fs, 64fs
BCKO0
High Width = 1/fBCK
256fs
0
1
0
1
1fs
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FCK Output
Duty = 50%
12MHz, 13.5MHz,
24MHz, 27MHz
BICK Output
Frequency
MCLK
BCLK
FCK
SDTI
SDTO
16fs
32fs
64fs
N/A
DSP or μP
(Table
(default)
9)
(default)
(Table
10). Except DSP mode,
[AK4634]
2007/10