AK4122A AKM [Asahi Kasei Microsystems], AK4122A Datasheet - Page 27

• Manufacturer Part Number: AK4122A
• Description: 24-Bit 96kHz SRC with DIR
• Manufacturer: AKM [Asahi Kasei Microsystems]

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The AK4122A has two methods for detecting sampling frequency for DIR. 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 must be set according to the FSO and MCLK frequencies for the
detection.
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 21. Frequencies in a range of ± 3% are identified as shown in the
Note 22. 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.
MS1076-E-01
FS3
Sampling Frequency and Pre-emphasis Detection for DIR
44.1kHz
0
0
0
0
1
1
48kHz
96kHz
FSO
-
Register Output
frequencies shown in
“1100”, “1110” or “0001” for the frequencies beyond the range of 32~ 96kHz.
FS2
(Table
0
0
0
0
0
0
XTL1
FS1
16) When XTL1-0 bits = “11”, the sampling frequency is detected by the channel status sampling
0
0
1
1
0
0
1
1
0
1
FS0
0
1
0
1
0
0
XTL0
PEM bit
0
1
0
1
0
1
Table 17
Reserved
44.1kHz
88.2kHz
48kHz
32kHz
96kHz
fs
ICKS1 / OCKS1
Pre-emphasis
are identified as nearer vale and are shown on FS3-0 bits. FS3-0 bits indicate
Table 16. Reference MCLK Frequency
OFF
ON
0
0
1
1
0
0
1
1
0
0
1
1
-
MCLK2 or OMCLK
Except XTL1-0 bit = “11”
Table 18. PEM Information
Table 17. fs Information
Clock comparison
(Note
Consumer mode
± 3%
± 3%
± 3%
± 3%
± 3%
ICKS0 / OCKS0
- 27 -
-
≠ 0X100
Bit3,4,5
0X100
21)
Byte0
0
1
0
1
0
1
0
1
0
1
0
1
-
Table 17.
Consumer Mode
Professional mode
Bit3,2,1,0
(Note
(1000)
(1010)
Intermediate frequencies between these
Byte3
Bit2,3,4
0000
0001
0010
0011
Byte0
≠ 100
Use channel status
MCLK Frequency
100
11.2896MHz
16.9344MHz
22.5792MHz
33.8688MHz
22)
12.288MHz
18.432MHz
24.576MHz
36.864MHz
24.576MHz
36.864MHz
XTL1-0 bit = “11”
N/A
N/A
(others)
Professional Mode
Bit7,6
Byte0
01
10
11
00
00
[AK4122A]
(default)
Bit6,5,4,3
Byte4
0000
0000
0000
0000
1010
0010
2010/05