AK4635 AKM [Asahi Kasei Microsystems], AK4635 Datasheet - Page 27

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

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1) PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
In this mode, irregular frequency clocks are output from FCK, BICK and MCKO pins after PMPLL bit = “0”
sampling frequency is changed. After that PLL is unlocked, the BICK and FCK pins output “L” for a moment, and invalid
frequency clock is output from the MCKO pin at MCKO bit = “1”. If the MCKO bit is “0”, MCKO pin is output to “L”.
(Table
When sampling frequency is changed, BICK and FCK pins do not output irregular frequency clocks but go to “L” by
setting PMPLL bit to “0”.
2) PLL Slave Mode (PMPLL bit = “1”, M/S bit = “0”)
In this mode, an invalid clock is output from the MCKO pin after PMPLL bit = “0”
changed. After that, 256fs is output from the MCKO pin when PLL is locked. ADC and DAC output invalid data when
the PLL is unlocked. For DAC, the output signal should be muted by writing “0” to DACA and DACS bits in Addr=02H.
Rev. 0.6
PLL State
After that PMPLL bit “0”
PLL Unlock
PLL Lock
When PLL2 bit is “0” (PLL reference clock input is FCK or BICK pin), the sampling frequency is selected by FS3-2
bits.
PLL Unlock State
7)
(Table
Others
Mode
0
1
2
6)
Table 7. Clock Operation at PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
Table 6. Setting of Sampling Frequency at PLL2 bit = “0” and PMPLL bit = “1”
Table 8. Clock Operation at PLL Slave Mode (PMPLL bit = “1”, M/S bit = “0”)
FS3 bit
PLL State
After that PMPLL bit “0”
PLL Unlock
PLL Lock
0
0
1
“1”
FS2 bit
0
1
0
MCKO bit = “0”
“L” Output
“L” Output
“L” Output
Others
FS1 bit
x
x
x
MCKO pin
“1”
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MCKO bit = “1”
MCKO bit = “0”
256fs Output
FS0 bit
“L” Output
“L” Output
“L” Output
Invalid
Invalid
x
x
x
(x: Don’t care, N/A: Not available)
MCKO pin
Sampling Frequency
12kHz < fs ≤ 24kHz
24kHz < fs ≤ 48kHz
7.35kHz ≤ fs ≤ 12kHz
MCKO bit = “1”
See
“L” Output
BICK pin
Invalid
Range
Table 9
N/A
Invalid
Invalid
Output
“1” or sampling frequency is
“L” Output
1fs Output
FCK pin
Invalid
(default)
[AK4635]
2007/10
“1” or