參數(shù)資料
型號: AK4640
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: 16BIT CODEC WITH MIC /HP/SPK-AMPl
中文描述: 16位編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植,AMPl
文件頁數(shù): 67/76頁
文件大小: 634K
代理商: AK4640
ASAHI KASEI
[AK4640]
MS0273-E-00
2004/03
- 67 -
4. When an external clock is used in PLL mode. (Master mode)
MCKPD bit
(Addr:01H, D7)
PS1-0 bits
(Addr:04H, D5-4)
PMPLL bit
(Addr:01H, D5)
MCKO bit
(Addr:04H, D3)
MCKO pin
XX
00
40ms(max)
Output
BICK, LRCK
(Master Mode)
Output
External MCLK
Input
(1)
(2)
(3)
(4)
(5)
Example :
Audio I/F Format : I
2
S
BICK frequency at Master Mode : 64fs
Input Master Clock Select at PLL Mode : 11.2896MHz
Output Master Clock Frequency : 64fs
(1) Addr:01H, Data:00H
(2) Input external MCLK
(3) Addr:01H, Data 20H
(5) MCKO, BICK and LRCK output starts
(4) Addr:04H, Data 6AH
Figure 48. Clock Set Up Sequence(4)
<Example>
(1) Release the pull-down of the XTI pin : MCKPD bit = “1”
“0”
(2) Input an external MCKI
(3) Power-up PLL : PMPLL bit = “0”
“1”
PLL needs 40ms lock time after the PMPLL bit = “0”
“1”.
(4) Enable MCKO output : MCKO bit = “0”
“1” and set up MCKO output frequency (PS1-0 bits)
(5) MCKO, BICK and LRCK are output after PLL lock time.
5. External clock mode
MCKPD bit
(Addr:01H, D7)
FS1-0 bits
(Addr:05H, D6-5)
XX
00
BICK, LRCK
(Slave Mode)
Input
External MCLK
Input
BICK, LRCK
(Master Mode)
Output
(1)
(2)
(3)
(4)
(5)
Example :
Audio I/F Format : I
2
S
BICK frequency at Master Mode : 64fs
Input Master Clock Frequency : 256fs
Output Master Clock Frequency : 64fs
(1) Addr:01H, Data:00H
(2) Addr:05H, Data 00H
(3) Input external MCLK
(4) Input BICK and LRCK(Slave)
(5) BICK and LRCK output(Master)
Figure 49. Clock Set Up Sequence(5)
<Example>
(1) Release the pull-down of the XTI pin : MCKPD bit = “1”
“0”
(2) Set up MCKI frequency (FS1-0 bits)
(3) Input an external MCKI
(4) In slave mode, input MCKI, BICK and LRCK.
(5) In master mode, while MCKI is input, BICK and LRCK are output.
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