ak4116 AKM Semiconductor, Inc., ak4116 Datasheet - Page 13
ak4116
Manufacturer Part Number
ak4116
Description
Low Power 48khz Digital Audio Receiver
Manufacturer
AKM Semiconductor, Inc.
Datasheet
1.AK4116.pdf
(37 pages)
ASAHI KASEI
The AK4116 has two methods for detecting the sample frequency:
1) Clock comparison between recovered clock and the X’tal oscillator
2) Sampling frequency information on channel status
The pre-emphasis information is detected and reported on the PEM bit. This information is extracted from channel 1 by
default (CS12=0). It can be switched to channel 2 by changing the CS12 bit in the control register.
MS0156-E-03
Sampling Frequency and Pre-emphasis Detection
Note 1: At least ±3% range is identified as the value in the Table 4. In case of an intermediate frequency of these two,
Note 2: In consumer mode, Byte3 Bit3-0 are copied to FS3-0.
FS3
FS3-0 bits indicate the detected RX input frequency referred to X’tal frequency. XTL1-0 bits select the reference
X’tal frequency (Table 3).
When XTL1-0= “11”, FS3-0 bits indicate the decoded sampling frequency information from channel status.
0
0
0
0
1
1
1
1
Register output
FS3-0 bits indicate the nearer value. When the frequency is much larger than 48kHz or much smaller than
32kHz, FS3-0 bits indicate any values except 32kHz, 44.1kHz and 48kHz.
FS2
0
0
0
0
0
0
1
1
FS1
0
0
1
1
0
1
0
1
XTL1
PEM
0
0
1
1
0
1
FS0
0
1
0
1
0
0
0
0
Pre-emphasis
XTL0
Reserved
Reserved
Reserved
Reserved
Reserved
44.1kHz
0
1
0
1
48kHz
32kHz
Table 4. Sampling frequency information
OFF
ON
fs
Table 3. Reference X’tal frequency
Table 5. Pre-emphasis information
Except XTL1-0= “11”
Clock comparison
Consumer mode
44.1kHz ± 3%
48kHz ± 3%
32kHz ± 3%
(Use channel status)
- 13 -
Reserved
Reserved
Reserved
Reserved
Reserved
(Note 1)
X’tal Frequency
≠ 0X100
Bits 3-5
Byte 0
0X100
11.2896MHz
12.288MHz
24.576MHz
Consumer
Bit3,2,1,0
( 1 0 0 0 )
( 1 0 1 0 )
( 1 1 0 0 )
( 1 1 1 0 )
Professional mode
(Note 2)
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
Byte3
mode
Bits 2-4
Byte 0
≠110
110
XTL1-0= “11”
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
[AK4116]
2005/08