參數(shù)資料
型號(hào)： AK4116VN
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： Low Power 48kHz Digital Audio Receiver
中文描述： 低功率48kHz的數(shù)字音頻接收器
文件頁(yè)數(shù)： 13/37頁(yè)
文件大?。?/td> 372K
代理商： AK4116VN
ASAHI KASEI
[AK4116]
MS0156-E-03
2005/08
- 13 -
Sampling Frequency and Pre-emphasis Detection
The AK4116 has two methods for detecting the sample frequency:
1) Clock comparison between recovered clock and the X’tal oscillator
FS3-0 bits indicate the detected RX input frequency referred to X’tal frequency. XTL1-0 bits select the reference
X’tal frequency (Table 3).
2) Sampling frequency information on channel status
When XTL1-0= “11”, FS3-0 bits indicate the decoded sampling frequency information from channel status.
XTL1
XTL0
X’tal Frequency
0
0
11.2896MHz
0
1
1
0
1
1
(Use channel status)
Table 3. Reference X’tal frequency
Except XTL1-0= “11”
Default
12.288MHz
24.576MHz
XTL1-0= “11”
Register output
fs
Consumer
mode
(Note 2)
Byte3
Bit3,2,1,0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
( 1 0 0 0 )
( 1 0 1 0 )
( 1 1 0 0 )
( 1 1 1 0 )
Professional mode
FS3
FS2
FS1
FS0
Clock comparison
(Note 1)
Byte0
Bit7,6
0 1
Byte4
Bit6,5,4,3
0 0 0 0
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
Reserved
Reserved
Reserved
Reserved
44.1kHz
±
3%
Reserved
48kHz
±
3%
32kHz
±
3%
Reserved
Reserved
Reserved
Reserved
(Others)
1 0
1 1
0 0
0 0
0 0
0 0
0 0 0 0
0 0 0 0
1 0 1 0
0 0 1 0
1 0 1 1
0 0 1 1
Note 1: At least
±
3% range is identified as the value in the Table 4. In case of an intermediate frequency of these two,
FS3-0 bits indicate the nearer value. When the frequency is much larger than 48kHz or much smaller than
32kHz, FS3-0 bits indicate any values except 32kHz, 44.1kHz and 48kHz.
Note 2: In consumer mode, Byte3 Bit3-0 are copied to FS3-0.
Table 4. Sampling frequency information
The pre-emphasis information is detected and reported on the PEM bit. This information is extracted from channel 1 by
default (CS12=0). It can be switched to channel 2 by changing the CS12 bit in the control register.
Consumer mode
PEM
Pre-emphasis
Byte 0
Bits 3-5
0
OFF
≠
0X100
1
ON
0X100
Table 5. Pre-emphasis information
Professional mode
Byte 0
Bits 2-4
≠
110
110
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