AK4635 AKM [Asahi Kasei Microsystems], AK4635 Datasheet - Page 32

• Manufacturer Part Number: AK4635
• Description: 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
The AK4635 becomes EXT Master Mode by setting PMPLL bit = “0” and M/S bit = “1”. Master clock is input from the
MCKI pin, the internal PLL circuit is not operated. The clock required to operate is MCKI (256fs, 512fs or 1024fs). The
input frequency of MCKI is selected by FS1-0 bits
bits
External Master Mode does not support Mode 0 (DSP Mode) of Audio Interface Format.
MCKI should always be present whenever the ADC, DAC, SPK or Programmable Filter is in operation (PMADC =
PMDAC = PMSPK bit = PMPFIL bits = “1”). If MCKI is not provided, the AK4635 may draw excess current and it is not
possible to operate properly because utilizes dynamic refreshed logic internally. If MCKI is not present, the ADC, DAC,
SPK and Programmable Filter should be in the power-down mode (PMADC = PMDAC = PMSPK = PMPFIL bits = “0”).
Rev. 0.6
EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”)
(Table
Mode
0
1
2
3
Table 14. MCKI Frequency at EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”) (x: Don’t care)
15). FCK bit should be set to “0”.
FS3-2 bits
Mode
Table 15. BICK Output Frequency at Master Mode (N/A: Not available)
x
x
x
x
0
1
2
3
AK4635
BCKO1
FS1 bit
0
0
1
1
MCKO
MCKI
BICK
FCK
SDTO
SDTI
0
0
1
1
Figure 28. EXT Master Mode
FS0 bit
256fs, 512fs or 1024fs
(Table
BCKO0
0
1
0
1
0
1
0
1
32fs, 64fs
- 32 -
14). The BICK is selected among 32fs or 64fs, by BCKO1-0
1fs
MCKI Input
Frequency
1024fs
256fs
512fs
256fs
BICK Output
Frequency
MCLK
BCLK
FCK
SDTI
SDTO
N/A
32fs
64fs
N/A
DSP or μP
7.35kHz ≤ fs ≤ 48kHz
7.35kHz ≤ fs ≤ 13kHz
7.35kHz ≤ fs ≤ 26kHz
7.35kHz ≤ fs ≤ 48kHz
Sampling Frequency
Range
(default)
(default)
[AK4635]
2007/10