ak4633 AKM Semiconductor, Inc., ak4633 Datasheet - Page 28

• Manufacturer Part Number: ak4633
• Description: 16-bit ?? Mono Codec With Alc & Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
When PLL2 bit is “0”(PLL reference clock input is FCK or BICK pin), the sampling frequency is selected by FS3-2 bits
(Table 6).
1) PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
In this mode, after PMPLL bit = “0”
frequency clock is output from MCKO pin when MCKO bit is “1”. If MCKO bit is “0”, “L” is output from MCKO pin.
( Table 7)
In case that sampling frequency is changed, setting PMPLL bit to “0” once a time could be prevent BICK and FCK pins
output to “L” from unstable clocks.
2) PLL Slave Mode (PMPLL bit = “1”, M/S bit = “0”)
In this mode, an invalid clock is output from MCKO pin after PMPLL bit = “0”
After that, 256fs clock is output from MCKO pin while PLL is locked. However, the normal data couldn’t output from
ADC and DAC while PLL is unlocked. For DAC, the output signal should be muted by setting “0” to DACA and DACM
bits in Addr=02H.
MS0447-E-03
PLL State
After that PMPLL bit “0”
PLL Unlock
PLL Lock
PLL Unlock State
Others
Mode
0
1
2
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”
“1” and until PLL locked , “L” are output from BICK and FCK pins and invalid
“L” Output
“L” Output
“L” Output
Others
Don’t care
Don’t care
Don’t care
FS1 bit
MCKO pin
“1”
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MCKO bit = “1”
MCKO bit = “0”
256fs Output
Don’t care
Don’t care
Don’t care
FS0 bit
“L” Output
“L” Output
“L” Output
Invalid
Invalid
MCKO pin
Sampling Frequency
12kHz < fs ≤ 24kHz
24kHz < fs ≤ 48kHz
7.35kHz ≤ fs ≤ 12kHz
MCKO bit = “1”
See Table 9
“L” Output
BICK pin
“1” or sampling frequency is changed.
256fs Output
Invalid
Range
N/A
Invalid
Invalid
“L” Output
1fs Output
FCK pin
Invalid
Default
[AK4633]
2006/04