參數(shù)資料
型號: AK4584VQ
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: 24Bit 96kHz Audio CODEC with DIT/DIR
中文描述: 24位96kHz的音頻編解碼器與動態(tài)網(wǎng)/迪爾
文件頁數(shù): 25/53頁
文件大小: 351K
代理商: AK4584VQ
ASAHI KASEI
[AK4584]
MS0118-E-00
2001/11
- 25 -
Sampling Frequency and Pre-emphasis Detection
The AK4584 has two methods for detecting the sampling frequency. The sampling frequency is detected by comparing the
recovered clock to the X’tal oscillator, and the detected frequency is reported on FS3-0 bits. XTL1-0 bits can select
reference X’tal frequency (Table 11). When XTL1-0 bits = “11” and XTALE pin = “L”, X’tal oscillator is stopped and the
sampling frequency is detected by the channel status sampling frequency information. The detected frequency is reported
on FS3-0 bits. The default values of FS3-0 bits are “0000”.
XTL1
0
0
1
1
XTL0
0
1
0
1
X’tal Frequency
11.2896MHz
12.288MHz
24.576MHz
Use channel status
Default
Table 11. Reference X’tal Frequency
Except XTL1-0 bits=“11”
XTL1-0 bits=“11”
Register Output
Consumer Mode
(Note 1)
Byte3
Bit3,2,1,0
0000
0001
0010
0011
(1000)
(1010)
(1100)
(1110)
Pro Mode
FS3
FS2
FS1
FS0
fs
Clock comparison
Byte0
Bit7,6
01
(others)
10
11
00
00
00
00
Byte4
Bit6,5,4,3
0000
0000
0000
0000
1010
0010
1011
0011
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
0
0
44.1kHz
Reserved
48kHz
32kHz
88.2kHz
96kHz
176.4kHz
192kHz
±
3%
-
±
3%
±
3%
±
3%
±
3%
±
3%
±
3%
Table 12. fs Information
Note 1. In consumer mode, Byte3 Bit3-0 are copied to FS3-0.
The pre-emphasis information is detected and reported on the PEM bit. This information is extracted from channel 1
(default). It can be switched to channel 2 via the CS12 bit in the control register.
PEM bit
Pre-emphasis
Byte0
Bit3,4,5
0X100
0X100
0
1
OFF
ON
Table 13. PEM in Consumer Mode
PEM bit
Pre-emphasis
Byte0
Bit2,3,4
100
100
0
1
OFF
ON
Table 14. PEM in Pro Mode
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