AK4115 Datasheet, PDF (26/64 Pages) Asahi Kasei Microsystems – High Feature 192kHz 24bit Digital Audio Interface Transceiver

ASAHI KASEI
[AK4115]
„ Sampling Frequency and Pre-emphasis Detection
The AK4115 has two methods for detecting the sampling frequency:
1. Clock comparison between the recovered clock and X’tal oscillator
2. Sampling frequency information from channel status
The method is selected by the XTL1,0 pins. When XTL1, 0 = “1,1”, the sampling frequency is detected by the channel
status sampling frequency information. The detected frequency is available on the FS3-0 bits.
XTL1
0
0
1
1
XTL0
0
1
0
1
X’tal Frequency
X’tal #1
X’tal #2
11.2896MHz
12.288MHz
12.288MHz
11.2896MHz
24.576MHz
22.5792MHz
(Use channel status)
(Use channel status)
Table 13. Reference X’tal frequency
Default
Except XTL1, 0 = “1,1”
XTL1, 0 = “1, 1”
Register output
fs
FS3 FS2 FS1 FS0
Clock comparison
(Note 37)
Consumer
mode
(Note 38)
Byte3
Bit3,2,1,0
Professional mode
(Note 39)
Byte0
Bit7,6
Byte4
Bit6,5,4,3
0
0
0
0
44.1kHz
44.1kHz ± 3%
0000
01
0000
0
0
0
1
Reserved
-
0001
(Others)
0
0
1
0
48kHz
0
0
1
1
32kHz
0
1
0
0 22.05kHz
0
1
1
0
24kHz
48kHz ± 3%
32kHz ± 3%
22.05kHz ± 3%
24kHz ± 3%
0010
10
0011
11
0100
00
0110
00
0000
0000
1001
0001
1
0
1
1
64kHz
64kHz ± 3%
1
0
0
0
88.2kHz
1
0
1
0
96kHz
88.2kHz ± 3%
96kHz ± 3%
1000
00
1010
00
1010
0010
1
1
0
0 176.4kHz
1
1
1
0
192kHz
176.4kHz ± 3%
192kHz ± 3%
1100
00
1110
00
1011
0011
Note 37: At least ±3% range is identified as the value in the Table 14. In case of intermediate frequency of those
two, FS3-0 bits indicate no value. When the frequency is ≥ 3% over 192kHz or ≤ 3% under 22kHz,
FS3-0 bits may indicate “0001”, “0101”, “0111” or “1001”.
Note 38: In consumer mode, Byte3 Bit3-0 are copied to FS3-0 bits.
Note 39. In professional mode, FS3-0 bit indicates “0001” except for frequency shown by Table 14.
Table 14. fs Information
MS0573-E-00
- 26 -
2006/12