ak4683 AKM Semiconductor, Inc., ak4683 Datasheet - Page 47

• Manufacturer Part Number: ak4683
• Description: Asynchronous Multi-channel Audio Codec With Dir/t
• Manufacturer: AKM Semiconductor, Inc.

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The AK4683 has two methods for detecting the sampling frequency as follows.
Those could be selected by XTL1, 0 bits. And the detected frequency is reported on FS3-0 bits.
The pre-emphasis information is detected and reported on PEM bit. This information is extracted from channel 1 at
default. It can be switched to channel 2 by CS12 bit in control register.
MS0427-E-02
Sampling Frequency and Pre-emphasis Detection
Note1: At least ±3% range is identified as the value in the Table 48. In case of intermediate frequency of those two,
Note2: When consumer mode, Byte3 Bit3-0 are copied to FS3-0 bits.
FS3
1. Clock comparison between recovered clock and XTI/MCLK2
2. Sampling frequency information on channel status
0
0
0
0
1
1
1
1
FS3-0 bits indicate nearer value. When the frequency is much bigger than 192kHz or much smaller than
32kHz, FS3-0 bits may indicate “0001”.
Register output
FS2
0
0
0
0
0
0
1
1
FS1
0
0
1
1
0
1
0
1
XTL1
0
0
1
1
FS0
0
1
0
1
0
0
0
0
XTL0
0
1
0
1
Table 47. Reference XTI/MCLK2 frequency
176.4kHz
Reserved
44.1kHz
88.2kHz
192kHz
48kHz
32kHz
96kHz
PEM
PEM
Table 50. PEM in Professional Mode
fs
Table 49. PEM in Consumer Mode
0
1
0
1
Table 48. fs Information
Except XTL1,0= “1,1”
Pre-emphasis
Pre-emphasis
Clock comparison
XTI/MCLK2 Frequency
OFF
OFF
(Use channel status)
ON
ON
- 47 -
176.4kHz
Reserved
(Note 1)
44.1kHz
88.2kHz
192kHz
11.2896MHz
48kHz
32kHz
96kHz
12.288MHz
24.576MHz
≠ 0X100
Bits 3-5
Bits 2-4
Byte 0
0X100
Byte 0
≠110
110
Consumer
Bit3,2,1,0
( 1 0 0 0 )
( 1 0 1 0 )
( 1 1 0 0 )
( 1 1 1 0 )
(Note 2)
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
Byte3
mode
XTL1,0= “1,1”
(default)
Bit7,6
Byte0
Professional mode
0 1
1 0
1 1
0 0
0 0
0 0
0 0
(Others)
Bit6,5,4,3
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
Byte4
[AK4683]
2007/04