ak4117 AKM Semiconductor, Inc., ak4117 Datasheet - Page 13

• Manufacturer Part Number: ak4117
• Description: Low Power 192khz Digital Audio Receiver
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4117 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.
MS0157-E-03
Sampling Frequency and Pre-emphasis Detection
Note 1: At least ±3% range is identified as the value in the Table 5. 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 4).
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 192kHz or much smaller than
32kHz, FS3-0 bits may indicate “0001”.
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
176.4kHz
Reserved
44.1kHz
88.2kHz
192kHz
0
1
0
1
48kHz
32kHz
96kHz
Table 5. Sampling frequency information
OFF
ON
fs
Table 4. Reference X’tal frequency
Table 6. Pre-emphasis information
Except XTL1-0= “11”
Clock comparison
176.4kHz ± 3%
Consumer mode
44.1kHz ± 3%
88.2kHz ± 3%
192kHz ± 3%
48kHz ± 3%
32kHz ± 3%
96kHz ± 3%
(Use channel status)
- 13 -
Reserved
(Note 1)
X’tal Frequency
≠ 0X100
Bits 3-5
0X100
Byte 0
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
Byte0
Bit7,6
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
[AK4117]
2004/04