AK4635 AKM [Asahi Kasei Microsystems], AK4635 Datasheet - Page 28
AK4635
Manufacturer Part Number
AK4635
Description
16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP
Manufacturer
AKM [Asahi Kasei Microsystems]
Datasheet
1.AK4635.pdf
(81 pages)
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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. 0.6
PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
Mode
Mode
0
1
2
3
0
1
Table 10. FCK Output at PLL Master Mode and DSP Mode
AK4635
Table 9. BICK Output Frequency at Master Mode
BCKO1
FCKO
MCKI
MCKO
BICK
FCK
SDTO
SDTI
0
0
1
1
0
1
fBCK is BICK Output Frequency.
Figure 23. PLL Master Mode
16fs, 32fs, 64fs
BCKO0
High Width = 1/fBCK
256fs
0
1
0
1
1fs
- 28 -
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,
[AK4635]
2007/10
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