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參數(shù)資料
| 型號： | AK4673 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Stereo CODEC with MIC/HP-AMP and Touch Screen Controller |
| 中文描述： | 立體聲編解碼器麥克風/惠普- AMP及觸摸屏控制器 |
| 文件頁數(shù)： | 29/107頁 |
| 文件大?。?/td> | 1171K |
| 代理商： | AK4673 |
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[AK4673]
MS0670-E-00
2007/09
- 29 -
When PLL reference clock input is LRCK or BICK pin, the sampling frequency is selected by FS3 and FS1-0 bits. (
Table
7
).
FS2 bit is “don’t care”.
Mode
FS3 bit
FS2 bit
FS1 bit
FS0 bit
0
0
x
0
1
0
x
0
2
0
x
1
3
0
x
1
6
1
x
1
7
1
x
1
Others
Others
Sampling Frequency Range
7.35kHz
≤
fs
≤
8kHz
8kHz < fs
≤
12kHz
12kHz < fs
≤
16kHz
16kHz < fs
≤
24kHz
24kHz < fs
≤
32kHz
32kHz < fs
≤
48kHz
N/A
(x: Don’t care, N/A: Not available)
0
1
0
1
0
1
(default)
Table 7. Setting of Sampling Frequency at PMPLL bit = “1” (Reference Clock = LRCK or BICK pin)
■
PLL Unlock State
1) PLL Master Mode (AIN3 bit = “0”; 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 pins 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 goes to “L”
(
Table 8
).
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 8. Clock Operation at PLL Master Mode (PMPLL bit = “1”, M/S bit = “1”)
2) PLL Slave Mode (AIN3 bit = “0”, 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”. Then, the clock selected by
Table 10
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 10
BICK pin
LRCK pin
“L” Output
Invalid
See
Table 11
“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 9. Clock Operation at PLL Slave Mode (PMPLL bit = “0”, M/S bit = “0”)
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