參數(shù)資料
型號(hào): AK4671EG
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類(lèi): Codec
英文描述: Stereo CODEC with MIC/RCV/HP-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/垃圾車(chē)/惠普腺苷
文件頁(yè)數(shù): 45/164頁(yè)
文件大?。?/td> 1792K
代理商: AK4671EG
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[AK4671]
MS0666-E-00
2007/10
- 45 -
When PLL reference clock input is LRCK or BICK pin, the sampling frequency is selected by FS3-2 bits (
Table 6
).
Mode
FS3 bit
FS2 bit
FS1 bit
0
0
0
x
1
0
1
x
2
1
x
x
Others
Others
FS0 bit
x
x
x
Sampling Frequency Range
8kHz
fs
12kHz
12kHz < fs
24kHz
24kHz < fs
48kHz
N/A
(x: Don’t care, N/A: Not available)
(default)
Table 6. Setting of Sampling Frequency at PMPLL bit = “1” (Reference Clock = LRCK or BICK pin)
PLL Unlock State
1) PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
In this mode, LRCK and BICK pins go to “L” and irregular frequency clock is output from the MCKO pin at MCKO bit
is “1” before the PLL goes to lock state after PMPLL bit = “0”
“1”. If MCKO bit is “0”, the MCKO pin changes to “L”
(
Table 7
).
After the PLL is locked, a first period of LRCK and BICK may be invalid clock, but these clocks return to normal state
after a period of 1/fs.
When sampling frequency is changed, BICK and LRCK pins do not output irregular frequency clocks but go to “L” by
setting PMPLL bit to “0”.
MCKO pin
PLL State
MCKO bit = “0”
After that PMPLL bit “0”
“1”
“L” Output
PLL Unlock (except above case)
“L” Output
PLL Lock
“L” Output
Table 7. Clock Operation at PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
2) PLL Slave Mode (PMPLL bit = “1”, M/S bit = “0”)
In this mode, an invalid clock is output from the MCKO pin before the PLL goes to lock state after PMPLL bit = “0”
“1”. After that, the clock selected by
Table 9
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 DACL and DACH
bits.
MCKO bit = “1”
Invalid
Invalid
See
Table 9
BICK pin
LRCK pin
“L” Output
Invalid
See
Table 10
“L” Output
Invalid
1fs Output
MCKO pin
PLL State
MCKO bit = “0”
“L” Output
“L” Output
“L” Output
MCKO bit = “1”
Invalid
Invalid
Output
After that PMPLL bit “0”
“1”
PLL Unlock
PLL Lock
Table 8. Clock Operation at PLL Slave Mode (PMPLL bit = “0”, M/S bit = “0”)
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