AK4122VQ ETC [List of Unclassifed Manufacturers], AK4122VQ Datasheet - Page 27

• Manufacturer Part Number: AK4122VQ
• Description: 24 BIT 96KHZ SRC WITH DIR
• Manufacturer: ETC [List of Unclassifed Manufacturers]

ASAHI KASEI
The AK4122 has two methods for detecting the sampling frequency. The sampling frequency is detected by comparing
the recovered clock to the MCLK2 or OMCLK frequency, and the detected frequency is reported on FS3-0 bits. XTL1-0
bits, ICKS1-0 bits and OCKS1-0 bits can select reference MCLK2 and OMCLK (Table 16). When XTL1-0 bits = “11”,
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 “0001”. In case of detecting the sampling frequency by
MCLK when DIR is used, MCLK (MCLK2 or OMCLK) of selected output port (PORT2 or PORT3) should be input.
Note 1. At least ±3% range is identified as the value in the Table 17. In case of an intermediate frequency of these two,
Note 2. 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 by
default (CS12 bit = “0”). It can be switched to channel 2 by changing the CS12 bit in the control register.
MS0267-E-03
FS3
Sampling Frequency and Pre-emphasis Detection
0
0
0
0
1
1
Register Output
FS3-0 bits indicate the nearer value. When the frequency is much larger than 96kHz or much smaller than 32kHz,
FS3-0 bits may indicate “1100”, “1110” or “0001”.
FS2
XTL1
0
0
0
0
0
0
0
0
1
1
FS1
0
0
1
1
0
1
XTL0
0
1
0
1
FS0
0
1
0
1
0
0
PEM bit
0
1
ICKS1 / OCKS1
Reserved
44.1kHz
88.2kHz
48kHz
32kHz
96kHz
fs
0
0
1
1
0
0
1
1
0
0
1
1
Pre-emphasis
-
MCLK2 or OMCLK
Table 16. Reference MCLK Frequency
OFF
ON
Except XTL1-0 bit = “11”
Table 18. PEM Information
Table 17. fs Information
Clock comparison
ICKS0 / OCKS0
(Note 1)
Consumer mode
± 3%
± 3%
± 3%
± 3%
± 3%
- 27 -
-
0
1
0
1
0
1
0
1
0
1
0
1
≠ 0X100
-
Bit3,4,5
0X100
Byte0
Consumer Mode
Professional mode
Use channel status
MCLK Frequency
Bit3,2,1,0
11.2896MHz
22.5792MHz
16.9344MHz
33.8688MHz
(Note 2)
12.288MHz
24.576MHz
18.432MHz
36.864MHz
24.576MHz
36.864MHz
(1000)
(1010)
Byte3
Bit2,3,4
0000
0001
0010
0011
Byte0
≠ 100
100
N/A
N/A
XTL1-0 bit = “11”
(others)
Professional Mode
Bit7,6
Byte0
01
10
11
00
00
Default
Bit6,5,4,3
[AK4122]
Byte4
0000
0000
0000
0000
1010
0010
2004/08