
ASAHI KASEI
[AK4113]
MS0349-E-01
2005/03
- 18 -
Sampling Frequency and Pre-emphasis Detection
The AK4113 has two methods for detecting the sampling frequency.
1. Clock comparison between the recovered clock and X’tal oscillator
2. Sampling frequency information on channel status
The method is selected by the XTL1-0 bits. The detected frequency is available on the FS3-0 bits.
When XTL1-0 bits = “11”, the sampling frequency is detected by the channel status sampling frequency information. The
detected frequency is available on the FS3-0 bits. In parallel control mode, XTL1-0 bits are fixed to “10”.
XTL1 bit XTL0 bit
X’tal Frequency
0
0
11.2896MHz
0
1
1
0
1
1
(Use channel status)
Table 4. Reference X’tal frequency
Except XTL1-0 bit = “11”
fs
(Note 10)
12.288MHz
24.576MHz
Default
XTL1-0 bit = “11”
Register output
Consumer
mode
(Note 11)
Byte3
Bit3,2,1,0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 0
Professional mode
(Note 12)
FS3
FS2
FS1
FS0
Clock comparison
Byte0
Bit7,6
0 1
Byte4
Bit6,5,4,3
0 0 0 0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
44.1kHz
Reserved
48kHz
32kHz
22.05kHz
11.025kHz
24kHz
16kHz
88.2kHz
8kHz
96kHz
64kHz
176.4kHz
192kHz
44.1kHz
±
3%
-
48kHz
±
3%
32kHz
±
3%
22.05kHz
±
3%
11.025kHz
±
3%
24kHz
±
3%
16kHz
±
3%
88.2kHz
±
3%
8kHz
±
3%
96kHz
±
3%
64kHz
±
3%
176.4kHz
±
3%
192kHz
±
3%
(Others)
1 0
1 1
0 0
0 0 0 0
0 0 0 0
1 0 0 1
0 0
0 0 0 1
0 0
1 0 1 0
0 0
0 0 1 0
0 0
0 0
1 0 1 1
0 0 1 1
Note 10. At least
±
3% range is identified as the value in the. Table 5. In case of intermediate frequency of those
two, FS3-0 bits indicate no value. When the frequency is much bigger than 192kHz or much smaller
than 8kHz, FS3-0 bits may indicate “0001” or “1101”.
Note 11. In consumer mode, Byte3 Bit3-0 are copied to FS3-0 bits.
Note 12. In professional mode, FS3-0 bit indicates “0001” except for frequency shown by Table 5.
Table 5. fs Information