ASAHI KASEI
[AK4122]
AK4122
24-Bit 96kHz SRC with DIR
GENERAL DESCRIPTION
The AK4122 is a digital sample rate converter (SRC) with the digital audio receiver (DIR). The input
sample rate ranges from 8kHz to 96kHz. The output sample rate is 32kHz, 44.1kHz, 48kHz or 96kHz. By
using the AK4122, the system can take very simple configuration because the AK4122 has an internal
PLL and does not need any master clock at slave mode. Then the AK4122 is suitable for the application
interfacing to different sample rates like Car Audio, DVD recorder, etc.
FEATURES
1. SRC
• Asynchronous Sample Rate Converter
• Input Sample Rate Range (fsi) : 8kHz ∼ 96kHz
• Output Sample Rate (fso) : 32kHz, 44.1kHz, 48kHz, 96kHz
• Input to Output Sample Rate Ratio : 0.33 to 6
• THD+N : −113dB
• I/F format : MSB justified, LSB justified (16/24bit) and I2S compatible
• Clock for Master mode : 256/384/512/768fs
• SRC Bypass mode
• Soft Mute Function
2. DIR
• 4-Channel Inputs Selector & 1-Channel Through Output
• AES3, IEC60958, S/PDIF, EIAJ CP1201 Compatible
• Low Jitter Analog PLL
• PLL Lock Range : 32kHz ∼ 96kHz
• Auto detection
- Non-PCM Bit Stream
- DTS-CD Bit Stream
- Validity Flag
- Sampling Frequency (32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz)
- Unlock & Parity Error
- DAT Start ID
• 40-bit Channel Status Buffer
• Burst Preamble bit Pc, Pd Buffer for Non-PCM bit streams
• Q-subcode Buffer for CD bit streams
3. 4-wire Serial µP Interface
4. Power Supply
• AVDD: 3.0 ∼ 3.6V (typ. 3.3V)
• DVDD: 3.0 ∼ 3.6V (typ. 3.3V)
5. Ta = −10 ∼ 70°C
6. Package : 48pin LQFP
MS0267-E-02
2004/07
-1-
ASAHI KASEI
[AK4122]
Block Diagram
INT0 INT1 INT2
R
FILT
RX1
RX1
RX2
RX3
RX4
RX2
OPS1-0
TX
RX3
TX
RX4
PDN
IPS1-0
DIR
SMUTE
PORT3
PORT1
BICK1
LRCK1
SDTI
BICK1
BICK2
LRCK2
SDTIO
BICK2
LRCK1
SDTI
Serial
Audio
I/F
ISEL1-0
De-em
Filter
SDTIO
SRC
BYPS
Serial
Audio
I/F
LRCK
BICK
SDTO
LRCK
BICK
SDTO
OMCLK
PLL
PORT2
LRCK2
OSEL
Serial
Audio
I/F
M/S2
M/S3
Control Register
MCLK2
AVDD AVSS
DVDD DVSS
CDTO CDTI CCLK CSN
Block diagram
MS0267-E-02
2004/07
-2-
ASAHI KASEI
[AK4122]
Ordering Guide
AK4122VQ
AKD4122
−10 ∼ +70°C
48pin LQFP (0.5mm pitch)
Evaluation Board for AK4122
INT0
INT1
TX
SDTO
BICK
LRCK
OMCLK
DVSS
DVDD
BVSS
CSN
CCLK
Pin Layout
48 47 46 45 44 43 42 41 40 39 38 37
CDTI
1
36
SDTIO
CDTO
2
35
BICK2
TST1
3
34
LRCK2
INT2
4
33
MCLK2
TST2
5
8
29
BICK1
SMUTE
9
28
LRCK1
TST4
10
27
PDN
TST5
11
26
AVSS
FILT
12
25
13 14 15 16 17 18 19 20 21 22 23 24
R
TST11
AVSS
MS0267-E-02
TST10
M/S3
RX4
SDTI
TST9
30
RX3
7
TST8
M/S2
RX2
DVSS
TST7
31
Top View
RX1
6
TST3
TST6
DVDD
AVDD
32
AK4122VQ
2004/07
-3-
ASAHI KASEI
[AK4122]
PIN/FUNCTION
No.
Pin Name
I/O
1
2
3
4
5
CDTI
CDTO
TST1
INT2
TST2
I
O
O
O
O
6
TST3
I
7
M/S2
I
8
M/S3
I
9
SMUTE
I
10
TST4
I
11
TST5
I
12
FILT
O
13
14
AVSS
AVDD
-
15
TST6
I
16
RX1
I
17
TST7
I
18
RX2
I
19
TST8
I
20
RX3
I
21
TST9
I
22
RX4
I
23
TST10
I
24
TST11
O
Function
Control Data Input Pin
Control Data Output Pin
Test 1 Pin
Interrupt 2 Pin
Test 2 Pin
Test 3 Pin
This pin should be connected to DVSS.
Master / Slave Mode Pin for PORT2
“H” : Master mode, “L” : Slave Mode
Master / Slave Mode Pin for PORT3
“H” : Master mode, “L” : Slave Mode
Soft Mute Pin
“H” : Soft Mute, “L” : Normal Operation
Test 4 Pin
This pin should be connected to AVSS.
Test 5 Pin
This pin should be connected to AVSS.
PLL Loop Filter Pin
470Ω±5% resistor and 2.2µF±50% ceramic capacitor in parallel with a
2.2nF±50% ceramic capacitor should be connected to AVSS externally.
Analog Ground Pin
Analog Power Supply Pin, 3.0 ∼ 3.6V
Test 6 Pin
This pin should be connected to AVSS.
Receiver Input 1 Pin with Amp for 0.2Vpp (Internal Biased Pin)
Test 7 Pin
This pin should be connected to AVSS.
Receiver Input 2 Pin with Amp for 0.2Vpp (Internal Biased Pin)
Test 8 Pin
This pin should be connected to AVSS.
Receiver Input 3 Pin with Amp for 0.2Vpp (Internal Biased Pin)
Test 9 Pin
This pin should be connected to AVSS.
Receiver Input 4 Pin with Amp for 0.2Vpp (Internal Biased Pin)
Test 10 Pin
This pin should be connected to AVSS.
Test 11 Pin
Note: All input pins except internal biased pins should not be left floating.
MS0267-E-02
2004/07
-4-
ASAHI KASEI
[AK4122]
25
R
-
26
AVSS
-
27
PDN
I
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
LRCK1
BICK1
SDTI
DVSS
DVDD
MCLK2
LRCK2
BICK2
SDTIO
INT0
INT1
TX
SDTO
BICK
LRCK
OMCLK
DVSS
DVDD
46
BVSS
-
47
48
CSN
CCLK
I
I
I
I
I
I
I/O
I/O
I/O
O
O
O
O
I/O
I/O
I
-
External Resistor Pin
12kΩ±5% resistor should be connected to AVSS externally.
Analog Ground Pin
Power-Down Mode Pin
“H”: Power up, “L”: Power down reset and initializes the control register.
Input Channel Clock Pin
Audio Serial Data Clock Pin
Audio Serial Data Input Pin
Digital Ground Pin
Digital Power Supply Pin, 3.0 ∼ 3.6V
Master Clock Input Pin
Input / Output Channel Clock Pin
Audio Serial Data Clock Pin
Audio Serial Data Input / Output Pin
Interrupt 0 Pin
Interrupt 1 Pin
Transmitter Output Pin
Audio Serial Data Output Pin
Audio Serial Data Clock Pin
Output Channel Clock Pin
Master Clock Input Pin
Digital Ground Pin
Digital Power Supply Pin, 3.0 ∼ 3.6V
Substrate Ground Pin
This pin should be connected to AVSS.
Chip Select Pin
Control Data Clock Pin
Note: All input pins except internal biased pins should not be left floating.
MS0267-E-02
2004/07
-5-
ASAHI KASEI
[AK4122]
Handling of Unused pins
The unused digital I/O pins should be processed appropriately as below.
Classification
PORT1
PORT2
Pin Name
BICK1, LRCK1, SDTI
MCLK2
BICK2, LRCK2
SDTIO
M/S2
OMCLK
PORT3
DIR
Control PORT
Other
TEST
BICK, LRCK
SDTO
M/S3
RX1, RX2, RX3, RX4
INT0, INT1, INT2, TX
CSN, CCLK, CDTI
CDTO
SMUTE
TST1, TST2, TST11
TST3
TST4, TST5, TST6, TST7,
TST8, TST9, TST10
Setting
These pins should be connected to DVSS.
This pin should be connected to DVSS.
These pins should be connected to DVSS in slave mode
or
open in master mode.
This pin should be connected to DVSS.
This pin should be connected to DVDD or DVSS.
This pin should be connected to DVSS.
These pins should be connected to DVSS in slave mode
or open in master mode.
This pin should be open.
This pin should be connected to DVDD or DVSS.
These pins should be open.
These pins should be open.
These pins should be connected to DVSS.
This pin should be open.
This pin should be connected to DVSS.
These pins should be open.
This pin should be connected to DVSS.
These pins should be connected to AVSS.
MS0267-E-02
2004/07
-6-
ASAHI KASEI
[AK4122]
ABSOLUTE MAXIMUM RATINGS
(AVSS, BVSS, DVSS=0V; Note 1)
Parameter
Power Supplies:
Analog
Digital
|BVSS − DVSS| (Note 2)
Input Current, Any Pin Except Supplies
Digital Input Voltage 1 (Except RX1-4 pins)
Digital Input Voltage 2 (RX1-4 pins)
Ambient Temperature (Power applied)
Storage Temperature
Symbol
min
max
Units
AVDD
DVDD
∆GND
IIN
VIND1
VIND2
Ta
Tstg
−0.3
−0.3
−0.3
−0.3
−10
−65
4.6
4.6
0.3
±10
DVDD+0.3
AVDD+0.3
70
150
V
V
V
mA
V
V
°C
°C
Note 1. All voltages with respect to ground.
Note 2. AVSS, BVSS and DVSS must be connected to the same ground.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(AVSS, BVSS, DVSS=0V; Note 1)
Parameter
Symbol
min
typ
Power Supplies
Analog
AVDD
3.0
3.3
(Note 3)
Digital
DVDD
3.0
3.3
max
3.6
AVDD
Units
V
V
Note 1. All voltages with respect to ground.
Note 3. The power up sequence between AVDD and DVDD is not critical.
WARNING: AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
MS0267-E-02
2004/07
-7-
ASAHI KASEI
[AK4122]
SRC CHARACTERISTICS
(Ta=25°C; AVDD=DVDD=3.3V; AVSS=BVSS=DVSS=0V; data = 24bit; measurement bandwidth = 20Hz ~ FSO/2;
unless otherwise specified.)
Parameter
Symbol
min
typ
max
Units
SRC Characteristics:
Resolution
(Note 4)
24
Bits
Input Sample Rate
FSI
8
96
kHz
Output Sample Rate
FSO
32
96
kHz
THD+N
(Input = 1kHz, 0dBFS, Note 5)
FSO/FSI = 44.1kHz/48kHz
−113
dB
FSO/FSI = 48kHz/44.1kHz
−113
dB
FSO/FSI = 32kHz/48kHz
−114
dB
FSO/FSI = 96kHz/32kHz
−111
dB
Worst Case (FSO/FSI = 48kHz/8kHz)
−103
dB
Dynamic Range (Input = 1kHz, −60dBFS, Note 5)
114
dB
FSO/FSI = 44.1kHz/48kHz
115
dB
FSO/FSI = 48kHz/44.1kHz
115
dB
FSO/FSI = 32kHz/48kHz
116
dB
FSO/FSI = 96kHz/32kHz
112
dB
Worst Case (FSO/FSI = 32kHz/44.1kHz)
Dynamic Range (Input = 1kHz, −60dBFS, A-weighted, Note 5)
dB
117
FSO/FSI = 44.1kHz/48kHz
Ratio between Input and Output Sample Rate
(Note 6) FSO/FSI
0.33
6
Note 4. Input data for SRC corresponds to 24bit data. When LSB 4bit data is input, the AK4122 calculates as “0” data
because SRC is 20bit calculation. Therefore, SRC outputs “0” data.
Note 5. Measured by ROHDE & SCHWARZ UPD04, Rejection Filter = wide, 8192point FFT.
Note 6. The “0.33” is the ratio of FSO/FSI when FSI is 96kHz and FSO is 32kHz. The “6” is the ratio of FSO/FSI
when FSI is 8kHz and FSO is 48kHz.
S/PDIF RECEIVER CHARACTERISTICS
(Ta=25°C; AVDD, DVDD=3.0 ∼ 3.6V)
Parameter
Symbol
min
typ
Input Resistance
Zin
10
Input Voltage
VTH
200
Input Sample Frequency
fs
32
-
MS0267-E-02
max
96
Units
kΩ
mVpp
kHz
2004/07
-8-
ASAHI KASEI
[AK4122]
FILTER CHARACTERISTICS
(Ta=25°C; AVDD, DVDD=3.0 ∼ 3.6V; DEM=OFF)
Parameter
Symbol
min
Digital Filter
Passband −0.001dB 0.985 ≤ FSO/FSI ≤ 6.000
PB
0
0.905 ≤ FSO/FSI < 0.985
PB
0
0.714 ≤ FSO/FSI < 0.905
PB
0
0.656 ≤ FSO/FSI < 0.714
PB
0
0.536 ≤ FSO/FSI < 0.656
PB
0
0.492 ≤ FSO/FSI < 0.536
PB
0
0.452 ≤ FSO/FSI < 0.492
PB
0
0.333 ≤ FSO/FSI < 0.452
PB
0
Stopband
0.985 ≤ FSO/FSI ≤ 6.000
SB
0.5417FSI
0.905 ≤ FSO/FSI < 0.985
SB
0.5021FSI
0.714 ≤ FSO/FSI < 0.905
SB
0.3965FSI
0.656 ≤ FSO/FSI < 0.714
SB
0.3643FSI
0.536 ≤ FSO/FSI < 0.656
SB
0.2974FSI
0.492 ≤ FSO/FSI < 0.536
SB
0.2732FSI
0.452 ≤ FSO/FSI < 0.492
SB
0.2510FSI
0.333 ≤ FSO/FSI < 0.452
SB
0.1822FSI
Passband Ripple
PR
Stopband Attenuation
SA
96
Group Delay
(Note 7)
GD
-
typ
max
Units
0.4583FSI
0.4167FSI
0.3195FSI
0.2852FSI
0.2245FSI
0.2003FSI
0.1781FSI
0.1092FSI
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
dB
dB
1/fs
±0.01
58.5
-
Note 7. This value is the time from the rising edge of LRCK after data is input to rising edge of LRCK after data is output,
when LRCK for Output data corresponds with LRCK for Input.
DC CHARACTERISTICS
(Ta=25°C; AVDD, DVDD=3.0 ∼ 3.6V)
Parameter
Symbol
min
High-Level Input Voltage
VIH
70%DVDD
Low-Level Input Voltage
VIL
High-Level Output Voltage
(Iout=−400µA)
VOH
DVDD−0.4
Low-Level Output Voltage
(Iout=400µA)
VOL
Input Leakage Current
Iin
Parameter
Power Supply Current
Normal operation (PDN pin = “H”)
(Note 8)
FSI=FSO=48kHz at Slave Mode: AVDD=DVDD=3.3V
FSI=FSO=96kHz at Master Mode: AVDD=DVDD=3.3V
FSI=FSO=96kHz at Master Mode: AVDD=DVDD=3.6V
Power down (PDN pin = “L”)
(Note 9)
AVDD+DVDD
min
typ
-
max
30%DVDD
0.4
±10
Units
V
V
V
V
µA
typ
max
Units
15
29
-
45
mA
mA
mA
10
100
µA
Note 8. Typ and max values are the value of AVDD+DVDD in each power supply voltage.
Power supply current of each path@Slave Mode, AVDD=DVDD=3.3V, FSI=FSO=48kHz
1. PORT1 → SRC → PORT3: AVDD=5mA(typ), DVDD=10mA(typ)
2. PORT2 → SRC → PORT3: AVDD=5mA(typ), DVDD=10mA(typ)
3. DIR → SRC → PORT3: AVDD=6mA(typ), DVDD=9mA(typ)
Note 9. All digital input pins are held DVSS.
MS0267-E-02
2004/07
-9-
ASAHI KASEI
[AK4122]
SWITCHING CHARACTERISTICS
(Ta=25°C; AVDD, DVDD=3.0 ∼ 3.6V; CL=20pF)
Parameter
Symbol
min
Master Clock Timing
Frequency
fCLK
8.192
Pulse Width Low
tCLKL
0.4/fCLK
Pulse Width High
tCLKH
0.4/fCLK
LRCK for Input data (LRCK1, LRCK2)
Frequency
fs
8
Duty Cycle
Duty
48
LRCK for Output data (LRCK, LRCK2)
Frequency
(Note 10)
fs
32
Duty Cycle
Slave Mode
Duty
48
Master Mode
Duty
S/PDIF Clock Recover Frequency
fPLL
32
Audio Interface Timing
Input for PORT1
1/64fs
tBCK
BICK1 Period
65
tBCKL
BICK1 Pulse Width Low
65
tBCKH
Pulse Width High
30
tLRB
LRCK1 Edge to BICK1 “↑”
(Note 11)
30
tBLR
BICK1 “↑” to LRCK1 Edge
(Note 11)
30
tSDH
SDTI Hold Time from BICK1 “↑”
30
tSDS
SDTI Setup Time to BICK1 “↑”
Input for PORT2 (Slave mode)
1/64fs
tBCK
BICK2 Period
65
tBCKL
BICK2 Pulse Width Low
65
tBCKH
Pulse Width High
30
tLRB
LRCK2 Edge to BICK2 “↑”
(Note 11)
30
tBLR
BICK2 “↑” to LRCK2 Edge
(Note 11)
30
tSDH
SDTIO Hold Time from BICK2 “↑”
30
tSDS
SDTIO Setup Time to BICK2 “↑”
Output for PORT2 (Slave mode)
1/64fs
tBCK
BICK2 Period
65
tBCKL
BICK2 Pulse Width Low
65
tBCKH
Pulse Width High
30
tLRB
LRCK2 Edge to BICK2 “↑”
(Note 11)
30
tBLR
BICK2 “↑” to LRCK2 Edge
(Note 11)
tLRS
LRCK2 to SDTIO (MSB) (Except I2S mode)
tBSD
BICK2 “↓” to SDTIO
typ
50
50
50
max
Units
36.864
MHz
ns
ns
96
52
kHz
%
96
52
kHz
%
%
96
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
30
30
ns
ns
ns
ns
ns
ns
ns
Note 10. Min value is 8kHz at BYPASS mode.
Note 11. BICK1 rising edge must not occur at the same time as LRCK1 edge.
BICK2 rising edge must not occur at the same time as LRCK2 edge.
MS0267-E-02
2004/07
- 10 -
ASAHI KASEI
[AK4122]
Parameter
Output for PORT3 (Slave mode)
BICK Period
BICK Pulse Width Low
Pulse Width High
LRCK Edge to BICK “↑”
(Note 11)
BICK “↑” to LRCK Edge
(Note 11)
2
LRCK to SDTO (MSB) (Except I S mode)
BICK “↓” to SDTO
Output for PORT2 (Master mode)
BICK2 Frequency
BICK2 Duty
BICK2 “↓” to LRCK2
BICK2 “↓” to SDTIO
Output for PORT3 (Master mode)
BICK Frequency
BICK Duty
BICK “↓” to LRCK
BICK “↓” to SDTO
Control Interface Timing
CCLK Period
CCLK Pulse Width Low
Pulse Width High
CDTI Setup Time
CDTI Hold Time
CSN “H” Time
CSN “↓” to CCLK “↑”
CCLK “↑” to CSN “↑”
CDTO Delay
CSN “↑” to CDTO Hi-Z
Reset Timing
PDN Pulse Width
(Note 12)
(Note 13)
Symbol
min
tBCK
tBCKL
tBCKH
tLRB
tBLR
tLRS
tBSD
1/64fs
65
65
30
30
max
Units
30
30
ns
ns
ns
ns
ns
ns
ns
20
30
Hz
%
ns
ns
−20
−20
20
30
Hz
%
ns
ns
tCCK
tCCKL
tCCKH
tCDS
tCDH
tCSW
tCSS
tCSH
tDCD
tCCZ
200
80
80
40
40
150
50
50
1000
tPD
150
fBCK
dBCK
tMBLR
tBSD
fBCK
dBCK
tMBLR
tBSD
typ
64fs
50
−20
−20
64fs
50
45
70
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 11. BICK rising edge must not occur at the same time as LRCK edge.
Note 12. In case of using INT2. When INT2 is not used, the max value is not limited.
Note 13. The AK4122 can be reset by bringing the PDN pin = “L”.
MS0267-E-02
2004/07
- 11 -
ASAHI KASEI
[AK4122]
Timing Diagram
1/fCLK
VIH
MCLK
VIL
tCLKH
tCLKL
1/fs
VIH
LRCK
VIL
tBCK
VIH
BICK
VIL
tBCKH
tBCKL
Clock Timing
VIH
LRCK
VIL
tBLR
tLRB
VIH
BICK
VIL
tLRS
tBSD
SDTO
50%DVDD
tSDS
tSDH
VIH
SDTI
VIL
Audio Interface Timing (Slave mode)
Note : BICK shows BICK1 of PORT1, BICK2 of PORT2 and BICK of PORT3. LRCK shows LRCK1 of PORT1,
LRCK2 of PORT2 and LRCK of PORT3. SDTI shows SDTI of PORT1 or SDTIO of PORT2 that is used as
input port. SDTO shows SDTO of PORT3 or SDTIO of PORT2 that is used as output port.
MS0267-E-02
2004/07
- 12 -
ASAHI KASEI
[AK4122]
50%DVDD
LRCK
tMBLR
dBCK
BICK
50%DVDD
tBSD
SDTO
50%DVDD
tSDH
tSDS
VIH
SDTI
VIL
Audio Interface Timing (Master mode)
Note : BICK shows BICK1 of PORT1, BICK2 of PORT2 and BICK of PORT3. LRCK shows LRCK1 of PORT1,
LRCK2 of PORT2 and LRCK of PORT3. SDTI shows SDTI of PORT1 or SDTIO of PORT2 that is used as
input port. SDTO shows SDTO of PORT3 or SDTIO of PORT2 that is used as output port.
VIH
CSN
VIL
tCCKL
tCSS
tCCKH
VIH
CCLK
VIL
tCDS
tCDH
VIH
CDTI
C1
C0
R/W
VIL
CDTO
Hi-Z
WRITE/READ Command Input Timing
MS0267-E-02
2004/07
- 13 -
ASAHI KASEI
[AK4122]
tCSW
VIH
CSN
VIL
tCSH
VIH
CCLK
VIL
VIH
CDTI
D2
D1
D0
VIL
Hi-Z
CDTO
WRITE Data Input Timing
VIH
CSN
VIL
VIH
CCLK
VIL
VIH
CDTI
A1
A0
VIL
tDCD
CDTO
Hi-Z
D7
D6
50%DVDD
READ Data Output Timing 1
MS0267-E-02
2004/07
- 14 -
ASAHI KASEI
[AK4122]
tCSW
VIH
CSN
VIL
tCSH
VIH
CCLK
VIL
VIH
CDTI
VIL
tCCZ
CDTO
D2
D1
D0
Hi-Z
50%DVDD
READ Data Output Timing 2
tPD
PDN
VIL
Power Down & Reset Timing
MS0267-E-02
2004/07
- 15 -
ASAHI KASEI
[AK4122]
OPERATION OVERVIEW
Internal Signal Path
The input source of the SRC can be switched between the outputs of the DIR, PORT1 or PORT2. The input source of the
PORT2 and PORT3 can be switched between the outputs of the SRC or BYPASS. When PORT2 is used as input port,
PORT2 cannot use as output port. The signal path should be controlled during PWN bit = “0”. The Switch Names
(ISEL1-0 bits etc) in Figure 1 correspond to the register bits that control the switch function. Refer to Table 1.
DIR
PORT3
PORT1
Serial
Audio
I/F
ISEL1-0
De-em
Filter
OSEL
SRC
BYPS
Serial
Audio
I/F
PLL
PORT2
Serial
Audio
I/F
Figure 1. Connection Input Source & Output Source
Mode
0
1
2
3
4
5
6
7
8
9
Input PORT
ISEL1-0 bit
00 : PORT1
01 : PORT2
10 : DIR
00 : PORT1
01 : PORT2
10 : DIR
00 : PORT1
10 : DIR
00 : PORT1
10 : DIR
SRC / Bypass
BYPS bit
Output PORT
OSEL bit
0 : SRC
0 : PORT3
(Note 1)
1 : Bypass
0 : SRC
1 : Bypass
1 : PORT2
(Note 2)
Path
PORT1 → SRC → PORT3
PORT2 → SRC → PORT3
DIR → SRC → PORT3
PORT1 → PORT3
PORT2 → PORT3
DIR → PORT3
PORT1 → SRC → PORT2
DIR → SRC → PORT2
PORT1 → PORT2
DIR → PORT2
Table 1. Path Select
Default is Mode 0. (Path : PORT1 → SRC → PORT3)
After PDN pin = “L” → “H”, SDTIO pin of PORT2 is the input pin.
The DIF1-0 bits of the PORT1 should be set a value except “10” (I2S Compatible) when the DIR is
selected as an input port.
Refer to Table 6 and 7 for Master/Slave mode setting.
MS0267-E-02
2004/07
- 16 -
ASAHI KASEI
[AK4122]
Note 1. In this case, PORT2 is input port. If PORT2 is unused, the digital I/O pins should be processed appropriately
by Table 2.
M/S2 pin
Mode
L
Slave
H
Master
Unused pin
Pin I/O
Setting
MCLK2
I
This pin should be connected to DVSS.
BICK2
I
This pin should be connected to DVSS.
LRCK2
I
This pin should be connected to DVSS.
SDTIO
I
This pin should be connected to DVSS.
MCLK2
I
This pin should be connected to DVSS.
BICK2
O
This pin should be open.
LRCK2
O
This pin should be open.
SDTIO
I
This pin should be connected to DVSS.
Table 2. Pin Setting for PORT2
Note 2. In this case, PORT3 is output port. If PORT3 is unused, the digital I/O pins should be processed appropriately
by Table 3.
M/S3 pin
Mode
L
Slave
H
Master
Unused pin
Pin I/O
Setting
OMCLK
I
This pin should be connected to DVSS.
BICK
I
This pin should be connected to DVSS.
LRCK
I
This pin should be connected to DVSS.
SDTO
O
This pin should be open.
OMCLK
I
This pin should be connected to DVSS.
BICK
O
This pin should be open.
LRCK
O
This pin should be open.
SDTO
O
This pin should be open.
Table 3. Pin Setting for PORT3
System Clock
PORT1 can be operated in slave mode only. PORT2 and PORT3 work in master mode and slave mode. Internal system
clock is created by internal PLL using LRCK1, LRCK2 or LRCK of DIR. The MCLK is not needed when PORT2 and
PORT3 are in slave mode and then please set MCLK2 pin and OMCLK pin to DVSS. However, when PORT2 and
PORT3 are used in master mode, MCLK2 pin and OMCLK pin should be supplied to MCLK. The M/S2 pin and M/S3
pin select between master and slave mode. Table 4 and 5 show setting of MCLK frequency that PORT2 and PORT3 are
master mode. 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.
ICKS1
0
0
1
1
OCKS1
0
0
1
1
MCLK2
32kHz ≤ fs ≤ 48kHz 48kHz < fs ≤ 96kHz
0
256fs
256fs
1
384fs
384fs
0
512fs
N/A
1
768fs
N/A
Table 4. MCLK2 frequency select for Master mode
ICKS0
OMCLK
32kHz ≤ fs ≤ 48kHz 48kHz < fs ≤ 96kHz
0
256fs
256fs
1
384fs
384fs
0
512fs
N/A
1
768fs
N/A
Table 5. OMCLK frequency select for Master mode
Default
OCKS0
MS0267-E-02
Default
2004/07
- 17 -
ASAHI KASEI
[AK4122]
Master Mode and Slave Mode
When PORT2 and PORT3 are used as output port, the M/S2 pin and M/S3 pin select either master or slave mode. “H” is
master mode, “L” is slave mode. In master mode, MCLK should be input and the AK4122 outputs BICK and LRCK. In
slave mode, BICK and LRCK are input externally and MCLK is not needed. If PORT2 is used as input port, M/S2 pin
should be set “H” or “L”.
M/S2 pin
L
BYPS bit
0
Data I/O
Mode
BICK, LRCK
I/O
Slave, SRC
Input
Input
Available
1
Output
Not Available
0
I/O
Master, SRC
Output
1
I/O
Master, Bypass
Table 6. Master mode/Slave mode for PORT2
L
H
H
M/S3 pin
L
L
H
H
BYPS bit
Data I/O
Mode
BICK, LRCK
0
Output
Slave, SRC
Input
1
Output
Not Available
0
Output
Master, SRC
Output
1
Output
Master, Bypass
Table 7. Master mode/Slave mode for PORT3
Audio Interface Format
The audio interface should be controlled during PWN bit = “0”. When in BYPASS mode, BICK1, BICK2 and BICK are
fixed to 64fs.
(1) PORT1
Four kinds of data formats can be chosen with the DIF1-0 bits (Table 8). In all modes, the serial data is in MSB first, 2’s
compliment format. The SDTI is latched on the rising edge of BICK1. PORT1 corresponds to slave mode only.
Mode
0
1
2
3
DIF1
0
0
1
1
DIF0
Input Format
LRCK
0
16bit, LSB justified
H/L
1
24bit, MSB justified
H/L
0
24bit, I2S Compatible
L/H
1
24bit, LSB justified
H/L
Table 8. Audio Interface Format for PORT1
BICK
≥ 32fs
≥ 48fs
≥ 48fs
≥ 48fs
Default
Note: The DIF1-0 bits of the PORT1 should be set a value except “10” (I2S Compatible) when the DIR is
selected as an input port.
LRCK
0 1 2 3
9 10 11 12 13 14 15 0 1 2 3
9 10 11 12 13 14 15 0 1
BICK(32fs)
SDTI(i)
15 14 13
0 1 2 3
7 6 5 4 3 2 1 0 15 14 13
17 18 19 20
31 0 1 2 3
7 6 5 4 3 2 1 0 15
17 18 19 20
31 0 1
BICK(64fs)
SDTI(i)
Don't Care
15 14 13 12
1 0
Don't Care
15 14 13 12
2 1 0
SDTI-15:MSB, 0:LSB
Lch Data
Rch Data
Figure 2. Mode 0 Timing
MS0267-E-02
2004/07
- 18 -
ASAHI KASEI
[AK4122]
LRCK
0 1 2
20 21 22 23 24
31 0 1 2
20 21 22 23 24
31 0 1
BICK(64fs)
23 22
SDTI(i)
4 3 2 1 0
Don't Care 23 22
4 3 2 1 0
Don't Care 23
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 3. Mode 1 Timing
LRCK
0 1 2 3
21 22 23 24 25
0 1 2
21 22 23 24 25
0 1
BICK(64fs)
23 22
SDTI(i)
4 3 2 1 0 Don't Care 23 22
4 3 2 1 0
Don't Care
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 4. Mode 2 Timing
LRCK
0 1 2
8 9
24
31 0 1 2
8 9
24
31 0 1
BICK(64fs)
Don't Care
SDTI(i)
23
8
1 0
Don't Care
8
23
1 0
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 5. Mode 3 Timing
(2) PORT2
Four kinds of data formats can be chosen with the IDIF1-0 bits (Table 9). In all modes, the serial data is in MSB first, 2’s
compliment format. If PORT2 is selected the output port, the SDTIO is clocked out on the falling edge of BICK2, and if
PORT2 is selected the input port, the SDTIO is latched on the rising edge of BICK2. The audio interface supports both
master and slave modes. In master mode, BICK2 and LRCK2 are output with the BICK2 frequency fixed to 64fs and the
LRCK2 frequency fixed to 1fs.
Mode
0
1
2
3
IDIF1
0
0
1
1
IDIF0
0
1
0
1
Output Format
Input Format
24bit, MSB justified
16bit, LSB justified
24bit, MSB justified
24bit, MSB justified
24bit, I2S Compatible 24bit, I2S Compatible
24bit, MSB justified
24bit, LSB justified
Table 9. Audio Interface Format for PORT2
MS0267-E-02
LRCK
H/L
H/L
L/H
H/L
BICK
≥ 32fs
≥ 48fs
≥ 48fs
≥ 48fs
Default
2004/07
- 19 -
ASAHI KASEI
[AK4122]
LRCK
0 1 2 3
9 10 11 12 13 14 15 0 1 2 3
9 10 11 12 13 14 15 0 1
BICK(32fs)
SDTIO(o)
23 22 21
15 14 13 12 11 10 9 8 23 22 21
15 14 13 12 11 10 9 8 23
SDTIO(i)
15 14 13
7 6 5 4 3 2 1 0 15 14 13
7 6 5 4 3 2 1 0 15
0 1 2 3
17 18 19 20
31 0 1 2 3
23 22 21
7 6 5 4 3
17 18 19 20
31 0 1
BICK(64fs)
SDTIO(o)
SDTIO(i)
15 14 13 12
Don't Care
7 6 5 4 3
23 22 21
1 0
Don't Care
15 14 13 12
23
2 1 0
SDTIO-23:MSB, 0:LSB
SDTIO-15:MSB, 0:LSB
Lch Data
Rch Data
Figure 6. Mode 0 Timing
LRCK
0 1 2
20 21 22 23 24
31 0 1 2
20 21 22 23 24
31 0 1
BICK(64fs)
SDTIO(o)
23 22
4 3 2 1 0
23 22
4 3 2 1 0
23
SDTIO(i)
23 22
4 3 2 1 0
Don't Care 23 22
4 3 2 1 0
Don't Care 23
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 7. Mode 1 Timing
LRCK
0 1 2 3
21 22 23 24 25
21 22 23 24 25
0 1 2
0 1
BICK(64fs)
SDTIO(o)
23 22
4 3 2 1 0
23 22
4 3 2 1 0
SDTIO(i)
23 22
4 3 2 1 0
Don't Care 23 22
4 3 2 1 0
Don't Care
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 8. Mode 2 Timing
LRCK
0 1 2
8 9
24
31 0 1 2
8 9
24
31 0 1
BICK(64fs)
SDTIO(o)
SDTIO(i)
23 22
16 15
Don't Care
0
23
8
23 22
1 0
16 15
Don't Care
23
0
8
23
1 0
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 9. Mode 3 Timing
MS0267-E-02
2004/07
- 20 -
ASAHI KASEI
[AK4122]
(3) PORT3
Two kinds of data formats can be chosen with the ODIF bit (Table 10). In both modes, the serial data is in MSB first, 2’s
compliment format. The SDTO is clocked out on the falling edge of BICK. The audio interface supports both master and
slave modes. In master mode, BICK and LRCK are output with the BICK frequency fixed to 64fs and the LRCK
frequency fixed to 1fs.
Mode
0
1
ODIF
Output Format
LRCK BICK
0
24bit, MSB justified
H/L
≥ 48fs
1
24bit, I2S Compatible
L/H
≥ 48fs
Table 10. Audio Interface Format for PORT3
Default
LRCK
0 1 2 3
17 18 19 20
23 22 21
7 6 5 4 3
31 0 1 2 3
17 18 19 20
31 0 1
BICK(64fs)
SDTO(o)
23 22 21
7 6 5 4 3
23
SDTO-23:MSB, 0:LSB
Lch Data
Rch Data
Figure 10. Mode 0 Timing
LRCK
0 1 2 3
21 22 23 24 25
0 1 2
21 22 23 24 25
0 1
BICK(64fs)
SDTO(o)
23 22
4 3 2 1 0
23 22
4 3 2 1 0
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 11. Mode 1 Timing
MS0267-E-02
2004/07
- 21 -
ASAHI KASEI
[AK4122]
Soft Mute Operation
Soft mute operation is performed in the digital domain of the SRC output. Soft mute can be controlled by SMUTE bit or
SMUTE pin. The SMUTE bit and SMUTE pin are ORed between pin and register. When SMUTE bit goes “1” or
SMUTE pin goes “H”, the SRC output data is attenuated by −∞ within 1024 LRCK cycles. When the SMUTE bit returned
“0” and SMUTE pin goes “L” the mute is cancelled and the output attenuation gradually changes to 0dB during 1024
LRCK cycles. If the soft mute is cancelled before mute state after starting of the operation, the attenuation is discontinued
and returned to 0dB by the same cycles. The soft mute is effective for changing the signal source.
SMUTE
D AT T Level
(1)
(3)
A ttenuation
-∞
GD
(2)
GD
S D T IO / S D T O
Figure 12. Soft Mute Function
(1) The output data is attenuated by −∞ during 1024 LRCK cycles (1024/fs).
(2) Digital output delay from the digital input is called the group delay (GD).
(3) If the soft mute is cancelled before attenuating to −∞ after starting the operation, the attenuation is discontinued and
returned to 0dB by the same number of clock cycles.
MS0267-E-02
2004/07
- 22 -
ASAHI KASEI
[AK4122]
De-emphasis Filter Control
The AK4122 includes the digital de-emphasis filter (tc=50/15µs) by IIR filter corresponding to three sampling
frequencies (32kHz, 44.1kHz and 48kHz).
(1) When input port is DIR
When the input port is DIR and DEAU bit = “1”, the de-emphasis filter is enabled automatically by sampling frequency
(FS3-0 bit) and pre-emphasis information in the channel status. DEM1-0 bits can control the de-emphasis filter when
DEAU bit = “0”. When the de-emphasis filter is OFF, the internal de-emphasis filter is bypassed. When PEM bit = “0”,
the internal de-emphasis filter is always bypassed.
PEM
1
1
1
1
0
FS3
0
0
0
x
PEM
1
1
1
1
FS2
0
0
0
FS1
0
1
1
FS0
0
0
1
(Others)
x
x
x
Table 11. De-emphasis Auto Control (DEAU bit = “1”)
Mode
44.1kHz
48kHz
32kHz
OFF
OFF
DEM1
DEM0
Mode
0
0
44.1kHz
0
1
OFF
Default
1
0
48kHz
1
1
32kHz
Table 12. De-emphasis Manual Control (DEAU bit = “0”)
(2) When input port is PORT1 or PORT2
When PORT1 or PORT2 is selected as input port, DEM1-0 bits can control the de-emphasis filter even if DEAU bit = “0”
or DEAU bit = “1”. In this case, the de-emphasis filter cannot enable automatically. When the de-emphasis filter is OFF,
the internal de-emphasis filter is bypassed.
DEM1
DEM0
Mode
0
0
44.1kHz
0
1
OFF
Default
1
0
48kHz
1
1
32kHz
Table 13. De-emphasis Manual Control
System Reset and Power-Down
The AK4122 has a full power-down mode for all circuits that is activated by the PDN pin, and a partial power-down mode
activated by the PWN bit. The AK4122 should be reset once at power-up by bringing PDN pin = “L”.
PDN pin:
All analog and digital circuits are placed in power-down and reset modes by bringing PDN pin = “L”. All the
registers are initialized and clocks are stopped. Read/Write operations to the registers are disabled.
PWN bit (Address 00H; D0):
Unlike the PDN pin operation described above, internal registers and mode settings are not initialized. Read/Write
operations to the registers are enabled.
MS0267-E-02
2004/07
- 23 -
ASAHI KASEI
[AK4122]
System Reset
Bringing the PDN pin = “L” sets the AK4122 power-down mode and initializes the digital filter. When PDN pin = “L”,
the SDTO output is “L”. The AK4122 should be reset once by bringing PDN pin = “L” upon power-up. The SDTO is
valid from less than 100ms after the rising of PDN after clocks are supplied, and until then, outputs “L”. After the rising
of PDN pin, the SDTIO pin is input pin.
External clocks
(input / output port)
(stable)
don’t care
don’t care
PDN
< 100msec
Power-down
(internal state)
PLL locktime & fs detection
SDTO
normal operation
normal data
“0” data
Power-down
“0” data
Figure 13. System Reset
Sequence of changing clocks
The recommended sequence of changing clocks is shown as Figure 14. The internal reset is executed when the input or
the output clocks are changed. The SDTO is placed “0” during reset. Within 100ms, the SDTO outputs normal data.
When the frequency transition occurs gradually without the phase change, the output data may have large distortion for
several seconds. Then, to output normal data within 100ms, a reset by PDN pin = “L” or PWN bit = “0” is recommended
when clocks are changed.
External clocks
state 1 (44.1kHz) (unknown)
(input port
or output port)
PDN pin or
PWN bit
(internal state)
< 100msec
normal operation Power down PLL locktime
& fs detection
SDTIO / SDTO
SMUTE (Note2,
recommended)
Att.Level
state 2 (48kHz)
Note1
normal data
normal operation
normal data
1024/fso
1024/fso
0dB
-∞dB
Figure 14. Sequence of changing clocks
Note 1. The data on SDTO may cause click noise. If SDTI or SDTIO is “0” from GD before PDN pin goes “L”,
the data on SDTO keeps “0” then no unknown data is output.
Note 2. SMUTE can remove the unknown data.
MS0267-E-02
2004/07
- 24 -
ASAHI KASEI
[AK4122]
96kHz Clock Recovery
The on-chip, low jitter PLL of DIR has a wide lock range of 32kHz to 96kHz and a lock time of less than 20ms. The
AK4122 has a sampling frequency detect function (32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz) that uses either clock
comparison against the MCLK2 or OMCLK frequency or the channel status information. The PLL loses lock when the
received sync interval is incorrect.
Biphase Input
Four receiver inputs (RX1-4) of DIR are available. Each input includes an amplifier for unbalance loads that can accept
200mVpp or greater signal. The IPS1-0 bits select the receiver channel (Table 14).
IPS1
0
0
1
1
IPS0
Input Data
0
RX1
1
RX2
0
RX3
1
RX4
Table 14. Recovery Data Select
Default
Biphase Output
The AK4122 can output the through data from the digital receiver inputs (RX1-4) to the TX pin. The OPS1-0 bits can
select the source of the output from the TX pin. TX output can be stopped by TXE bit. AK4122 does not have the TX
output buffer (Line Driver), the TX pin cannot drive the 75Ω coaxial cable directly.
OPS1
0
0
1
1
OPS0
Output Data
0
RX1
1
RX2
0
RX3
1
RX4
Table 15. Output Data Select for TX
MS0267-E-02
Default
2004/07
- 25 -
ASAHI KASEI
[AK4122]
Biphase signal input circuit
0.1uF
RX
75Ω
Coax
75Ω
AK4122
Figure 15. Consumer Input Circuit (Coaxial Input)
Note 1: Coax input only : if a coupling level to this input from the next RX input line pattern exceeds 50mV,
an incorrect operation may occur. In this case, it is possible to lower the coupling level by adding this
decoupling capacitor.
Note 2: Ground of the RCA connector and terminator should be connected to AVSS of the AK4122 with low
impedance on PC board.
3.3V
Optical
Fiber
470
O/E
RX
Optical Receiver
AK4122
Figure 16. Consumer Input Circuit (Optical Input, Using 3.3V Optical Receiver)
When using coaxial input, the input level of the RX line is small. Care must be taken to reduce, crosstalk among RX input
lines by inserting a shield pattern between them.
MS0267-E-02
2004/07
- 26 -
ASAHI KASEI
[AK4122]
Sampling Frequency and Pre-emphasis Detection
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.
XTL1
XTL0
0
0
0
1
1
0
1
1
MCLK2 or OMCLK
MCLK Frequency
ICKS1 / OCKS1
ICKS0 / OCKS0
0
0
11.2896MHz
0
1
22.5792MHz
1
0
16.9344MHz
1
1
33.8688MHz
0
0
12.288MHz
0
1
24.576MHz
1
0
18.432MHz
1
1
36.864MHz
0
0
24.576MHz
0
1
N/A
1
0
36.864MHz
1
1
N/A
Use channel status
Table 16. Reference MCLK Frequency
Except XTL1-0 bit = “11”
Register Output
fs
FS3
FS2
FS1
FS0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
0
1
0
1
0
1
0
0
Clock comparison
(Note 1)
44.1kHz
Reserved
48kHz
32kHz
88.2kHz
96kHz
± 3%
± 3%
± 3%
± 3%
± 3%
Table 17. fs Information
Default
XTL1-0 bit = “11”
Consumer Mode
Professional Mode
(Note 2)
Byte3
Byte0
Byte4
Bit3,2,1,0
Bit7,6
Bit6,5,4,3
0000
01
0000
0001
(others)
0000
0010
10
0000
0011
11
0000
(1000)
00
1010
(1010)
00
0010
Note 1. At least ±3% range is identified as the value in the Table 17. In case of an intermediate frequency of these two,
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”.
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.
PEM bit
0
1
Consumer mode
Professional mode
Byte0
Byte0
Bit3,4,5
Bit2,3,4
OFF
≠ 0X100
≠ 100
ON
0X100
100
Table 18. PEM Information
Pre-emphasis
MS0267-E-02
2004/07
- 27 -
ASAHI KASEI
[AK4122]
Interrupt Handling for DIR
There are nine events that cause the INT2-0 pins to go “H”.
1. UNLCK: PLL unlock state detection
“1” when the PLL loses lock. The AK4122 loses lock when the distance between two preambles is
not correct or when those preambles are not correct.
2. PAR:
Parity error or biphase coding error detection
“1” when parity error or biphase coding error is detected, updated every sub-frame cycle.
3. AUTO:
Non-PCM or DTS-CD Bit Stream detection
The OR function of NPCM and DTSCD bits is output to the AUTO bit.
4. V:
Validity flag detection
“1” when validity flag is detected. Updated every sub-frame cycle.
5. AUDN:
Non-audio detection
“1” when the “AUDN” bit in recovered channel status indicates “1”. Updated every block cycle.
6. STC:
Sampling frequency or pre-emphasis information change detection
“1” when FS3-0 or PEM bit changes. Reading 07H register resets it.
7. QINT:
U bit (Q-subcode) sync flag
“1” when the Q-subcode differs from old one, and stays “1” until this register is read. Updated every
sync code cycle for Q-subcode. Reading 07H register resets it.
8. CINT:
Channel status sync flag
“1” when received C bits differ from old ones, and stays “1” until this register is read. Updated every
block cycle. Reading 07H register resets it.
9. DAT:
DAT Start ID detection
When the category code shows DAT, “1” when the Start ID of DAT is detected. Reading 08H register
resets it.
INT1-0 pins output an OR’ed signal based on the above nine interrupt events. When masked, the interrupt event does not
affect the operation of the INT1-0 pins (the masks do not affect the registers (UNLCK, PAR, etc.) themselves). Once
INT0 pin goes to “H”, it maintains “H” for 1024 cycles (this value can be changed by the EFH1-0 bits) after all events not
masked by mask bits are cleared. INT1 pin immediately goes to “L” when those events are cleared.
INT2 pin output a state change on the above 1 ∼ 5 and an OR’ed signal based on the above 6 ∼ 9. It stays “H” until 07H
and 08H registers are read. Mask bits are shared with INT0.
UNLCK, AUTO, V and AUDN bits indicate the interrupt status events above in real time. Once PAR, STC, QINT or
CINT and DAT bit goes to “1”, it stays “1” until the register is read.
When the AK4122 loses lock, the channel status bits are initialized. In this initial state, INT0 and INT2 outputs the OR’ed
signal between UNLCK and PAR bits. INT1 outputs the OR’ed signal to AUTO, V and AUDN. INT2-0 pins are “L”
when the DIR is not selected.
When DIR is used as input port and the PLL loses lock (unlock state), the output data is muted automatically. When
AMUTE bit = “1”, SDTIO and SDTO are muted automatically when the AK4122 detects unlock, Non-Audio or
Non-PCM/DTS-CD. After the interrupt events are cleared, mute is cancelled automatically. When AMUTE bit = “0”,
SDTIO and SDTO outputs “L” when the PLL loses lock (unlock state), and outputs data when other errors (PAR, AUTO
etc.).
MS0267-E-02
2004/07
- 28 -
ASAHI KASEI
[AK4122]
(1) UNLCK, PAR, AUTO, V and AUDN bits
Interrupt
(UNLCK, PAR, AUTO, V, AUDN)
INT0 pin
Hold Time (max:4096/fs)
INT1 pin
Hold Time = 0
INT2 pin
Register 07H
“0”
Hold “1”
“0”
Read 07H
BICK, LRCK (UNLCK)
Free Run
fs : around 20kHz
BICK, LRCK (except UNLCK)
SDTIO / SDTO (AMUTE = “1”)
(UNLCK, AUTO, V, AUDN)
Mute
SDTIO / SDTO (AMUTE = “0”)
(UNLCK)
“L” Output
SDTIO / SDTO (AMUTE = “0”)
(AUTO, V, AUDN)
SDTIO / SDTO (PAR error)
Previous Data
: Normal Operation
Figure 17. INT2-0 Timing (UNLCK, PAR, AUTO, V, AUDN bits)
MS0267-E-02
2004/07
- 29 -
ASAHI KASEI
[AK4122]
(2) STC, CINT and QINT bits
Interrupt
(FS3-0, PEM, C-bit, Q-sub)
Interrupt
(STC, CINT, QINT)
INT0 pin
(1)
(1)
(2)
INT1 pin
(2)
INT2 pin
Register 07H
“0”
Hold “1”
“0”
Hold “1”
“0”
Read 07H
BICK, LRCK
SDTIO / SDTO
: Normal Operation
Figure 18. INT2-0 Timing (STC, CINT, QINT bits)
(1) Hold Time : max. 4096/fs
(2) Hold Time = 0
MS0267-E-02
2004/07
- 30 -
ASAHI KASEI
[AK4122]
(3) DAT bit
Interrupt
(DAT)
INT0 pin
(1)
(1)
(2)
INT1 pin
(2)
INT2 pin
Register 08H
“0”
“0”
Hold “1”
Hold “1”
“0”
Read 08H
BICK, LRCK
SDTIO / SDTO
: Normal Operation
Figure 19. INT2-0 Timing (DAT bit)
(1) Hold Time : max. 4096/fs
(2) Hold Time = 0
MS0267-E-02
2004/07
- 31 -
ASAHI KASEI
[AK4122]
PD pin ="L" to "H"
Initialize
Read 07H, 08H
INT0/1 pin ="H"
No
Yes
Release
Muting
Mute SDTIO / SDTO
Read 07H, 08H
(Each Error Handling)
Read 07H, 08H
(Resets registers)
No
INT0/1 pin ="H"
Yes
Figure 20. Interrupt Handling Sequence Example 1
MS0267-E-02
2004/07
- 32 -
ASAHI KASEI
[AK4122]
PD pin ="L" to "H"
Initialize
Read 07H
No
INT1 pin ="H"
Yes
Read 07H
and
Detect QSUB= “1”
(Read Q-buffer)
QCRC = “0”
No
New data
is invalid
Yes
INT1 pin ="L"
No
Yes
New data
is valid
Figure 21. Interrupt Handling Sequence Example 2
MS0267-E-02
2004/07
- 33 -
ASAHI KASEI
[AK4122]
Q-subcode buffers
The DIR of the AK4122 has a Q-subcode buffer for CD application. The AK4122 takes Q-subcode into registers under
the following conditions:
1)
2)
3)
4)
The sync word (S0, S1) consists of at least 16 “0”s.
The start bit is “1”.
Those 7-bits Q-W follows to the start bit.
The distance between two start bits is 8-16 bits.
The QINT bit in the control register goes “1” when the new Q-subcode differs from old one, and goes “0” when QINT bit
is read.
S0
S1
S2
S3
:
S97
S0
S1
S2
S3
:
Q2
Q3 Q4
CTRL
Q5
Q6
Q7 Q8
ADRS
1
0
0
1
1
:
1
0
0
1
1
:
2
3
4
5
6
7
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Q2
R2
S2
T2
U2
V2
W2
Q3
R3
S3
T3
U3
V3
W3
:
:
:
:
:
:
:
Q97 R97 S97 T97 U97 V97 W97
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Q2
R2
S2
T2
U2
V2
W2
Q3
R3
S3
T3
U3
V3
W3
:
:
:
:
:
:
:
(*) number of “0” : min=0; max=8.
↑
Q
Figure 22. Configuration of U-bit(CD)
Q9
*
0…
0…
0…
0…
:
0…
0…
0…
0…
0…
:
Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25
TRACK NUMBER
INDEX
Q26 Q27 Q28 Q29 Q30 Q31 Q32 Q33 Q34 Q35 Q36 Q37 Q38 Q39 Q40 Q41 Q42 Q43 Q44 Q45 Q46 Q47 Q48 Q49
MINUTE
SECOND
FRAME
Q50 Q51 Q52 Q53 Q54 Q55 Q56 Q57 Q58 Q59 Q60 Q61 Q62 Q63 Q64 Q65 Q66 Q67 Q68 Q69 Q70 Q71 Q72 Q73
ZERO
ABSOLUTE MINUTE
ABSOLUTE SECOND
Q74 Q75 Q76 Q77 Q78 Q79 Q80 Q81 Q82 Q83 Q84 Q85 Q86 Q87 Q88 Q89 Q90 Q91 Q92 Q93 Q94 Q95 Q96 Q97
ABSOLUTE FRAME
CRC
G(x)=x16+x12+x5+1
Figure 23. Q-subcode
Addr
Register Name
13H Q-subcode Address / Control
14H
Q-subcode Track
15H
Q-subcode Index
16H
Q-subcode Minute
17H
Q-subcode Second
18H
Q-subcode Frame
19H
Q-subcode Zero
1AH
Q-subcode ABS Minute
1BH
Q-subcode ABS Second
1CH
Q-subcode ABS Frame
D7
D6
D5
D4
Q9
Q8
···
···
Q17
Q16
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
···
Q81
Q80
···
···
Figure 24. Q-subcode register map
MS0267-E-02
D3
···
···
···
···
···
···
···
···
···
···
D2
···
···
···
···
···
···
···
···
···
···
D1
Q3
Q11
···
···
···
···
···
···
···
Q75
D0
Q2
Q10
···
···
···
···
···
···
···
Q74
2004/07
- 34 -
ASAHI KASEI
[AK4122]
Non-PCM (AC-3, MPEG, etc.) and DTS-CD Bitstream Detection
The DIR of the AK4122 has a Non-PCM steam auto-detection function. When the 32-bit mode Non-PCM preamble
based on Dolby “AC-3 Data Stream in IEC60958 Interface” is detected, the NPCM bit goes to “1”. The 96-bit sync code
consists of 0x0000, 0x0000, 0x0000, 0x0000, 0xF872 and 0x4E1F. Detection of this pattern will set the NPCM to “1”.
Once the NPCM is set to “1”, it will remain “1” until 4096 frames pass through the chip without an additional sync pattern
being detected (Timing diagram: Figure 27 and Figure 28). When those preambles are detected, the burst preambles Pc
and Pd (Pc: burst information, Pd: length code; Refer to Table 22, 23) that follow those sync codes are stored to registers.
The AK4122 also has a DTS-CD bitstream auto-detection function. When AK4122 detects DTS-CD bitstream, the
DTSCD bit goes to “1”. If the next sync code does not occur within 4096 frames, the DTSCD bit goes to “0” until either
the AK4122 detects the stream again. OR’ed value of the NPCM and DTSCD bits are output to the AUTO bit. The
AK4122 detects 14bit sync word and 16bit sync word of a DTS-CD bitstream, the detection function can be set ON/OFF
by DTS14 and DTS16 bit.
Serial Control Interface
The internal registers may be either written or read by the 4-wire µP interface pins: CSN, CCLK, CDTI & CDTO. The
data on this interface consists of Chip address (2bits, C1/0 are fixed to “00”), Read/Write (1bit), Register address (MSB
first, 5bits) and Control data (MSB first, 8bits). Address and data is clocked in on the rising edge of CCLK and data is
clocked out on the falling edge. For write operations, data is latched after the 16th rising edge of CCLK, after a
high-to-low transition of CSN. For read operations, the CDTO output goes to high impedance after a low-to-high
transition of CSN. The maximum speed of CCLK is 5MHz. The chip address is fixed to “00”. The access to the chip
address except for “00” is invalid. PDN pin = “L” resets the registers to their default values. Read/Write can be access
without MCLK, BICK and , LRCK.
CSN
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
C1
C0
R/W
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
CCLK
CDTI
Write
Hi-Z
CDTO
CDTI
C1
C0
R/W
A4
A3
A2
A1
A0
Read
CDTO
Hi-Z
Hi-Z
C1 - C0 : Chip Address (Fixed to "00")
R/W :
READ / WRITE ("1" : WRITE, "0" : READ)
A4 - A0 : Register Address
D7 - D0 : Control Data
Figure 25. Control I/F Timing
MS0267-E-02
2004/07
- 35 -
ASAHI KASEI
[AK4122]
Register Map
Addr
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
Register Name
PDN & Mode Control
Selector & Clock Control
Audio Interface Format
DIR Control
INT0 Mask
INT1 Mask
DAT Mask & DTS Detect
Receiver Status 0
Receiver Status 1
Receiver Status 2
RX Channel Status Byte 0
RX Channel Status Byte 1
RX Channel Status Byte 2
RX Channel Status Byte 3
RX Channel Status Byte 4
Burst Preamble Pc Byte 0
Burst Preamble Pc Byte 1
Burst Preamble Pd Byte 0
Burst Preamble Pd Byte 1
Q-subcode Address / Control
Q-subcode Track
Q-subcode Index
Q-subcode Minute
Q-subcode Second
Q-subcode Frame
Q-subcode Zero
Q-subcode ABS Minute
Q-subcode ABS Second
Q-subcode ABS Frame
D7
XTL1
BYPS
0
CS12
MULK0
MULK1
0
UNLCK
DAT
0
CR7
CR15
CR23
CR31
CR39
PC7
PC15
PD7
PD15
Q9
Q17
Q25
Q33
Q41
Q49
Q57
Q65
Q73
Q81
D6
XTL0
OSEL
0
AMUTE
MPAR0
MPAR1
0
PAR
DTSCD
0
CR6
CR14
CR22
CR30
CR38
PC6
PC14
PD6
PD14
Q8
Q16
Q24
Q32
Q40
Q48
Q56
Q64
Q72
Q80
D5
TXE
ISEL1
0
EFH1
MAUT0
MAUT1
0
AUTO
NPCM
0
CR5
CR13
CR21
CR29
CR37
PC5
PC13
PD5
PD13
Q7
Q15
Q23
Q31
Q39
Q47
Q55
Q63
Q71
Q79
D4
SMUTE
ISEL0
ODIF
EFH0
MV0
MV1
0
V
PEM
0
CR4
CR12
CR20
CR28
CR36
PC4
PC12
PD4
PD12
Q6
Q14
Q22
Q30
Q38
Q46
Q54
Q62
Q70
Q78
D3
DEAU
ICKS1
IDIF1
IPS1
MAUD0
MAUD1
DTS16
AUDN
FS3
0
CR3
CR11
CR19
CR27
CR35
PC3
PC11
PD3
PD11
Q5
Q13
Q21
Q29
Q37
Q45
Q53
Q61
Q69
Q77
D2
DEM1
ICKS0
IDIF0
IPS0
MSTC0
MSTC1
DTS14
STC
FS2
0
CR2
CR10
CR18
CR26
CR34
PC2
PC10
PD2
PD10
Q4
Q12
Q20
Q28
Q36
Q44
Q52
Q60
Q68
Q76
D1
DEM0
OCKS1
DIF1
OPS1
MCIT0
MCIT1
MDAT1
CINT
FS1
CCRC
CR1
CR9
CR17
CR25
CR33
PC1
PC9
PD1
PD9
Q3
Q11
Q19
Q27
Q35
Q43
Q51
Q59
Q67
Q75
D0
PWN
OCKS0
DIF0
OPS0
MQIT0
MQIT1
MDAT0
QINT
FS0
QCRC
CR0
CR8
CR16
CR24
CR32
PC0
PC8
PD0
PD8
Q2
Q10
Q18
Q26
Q34
Q42
Q50
Q58
Q66
Q74
PDN pin = “L” resets the registers to their default values.
When PORT1 or PORT2 are selected as input port, the status registers (07H ∼ 1CH) are initialized.
Note. Unused bits must contain a “0” value.
Note. For addresses from 1DH ∼ 1FH, data must not be written.
MS0267-E-02
2004/07
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ASAHI KASEI
[AK4122]
Register Definitions
Addr Register Name
00H PDN & Mode Control
R/W
Default
D7
XTL1
R/W
1
D6
XTL0
R/W
1
D5
TXE
R/W
1
D4
SMUTE
R/W
0
D3
DEAU
R/W
0
D2
DEM1
R/W
0
D1
DEM0
R/W
1
D0
PWN
R/W
1
PWN: Power Down Control
0 : Power down
1 : Normal operation (Default)
“0” powers down all sections. The contents of all register are not initialized and enabled to write to the
registers. The internal registers (00H ∼ 06H) are not initialized, however, the status registers (07H ∼ 1CH)
are initialized. Read/Write operations to the registers are enabled.
DEM1-0: De-emphasis Control (Table 12, 13)
Initial values are “01”.
DEAU:
De-emphasis Auto Control
0 : Disable (Default)
1 : Enable
When DEAU bit = “1”, the de-emphasis filter is enabled automatically by sampling frequency and
pre-emphasis information in the channel status.
SMUTE: Soft Mute Control
0 : Normal operation (Default)
1 : SDTIO and SDTO soft mute
When SMUTE bit = “1”, SDTO and SDTIO outputs “L”.
TXE:
TX Output enable
0 : Disable, TX outputs “L”.
1 : Enable (Default)
XTL1-0: Reference MCLK Frequency Select (Table 16)
Initial values are “11”.
MS0267-E-02
2004/07
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ASAHI KASEI
Addr Register Name
01H Selector & Clock Control
R/W
Default
[AK4122]
D7
BYPS
R/W
0
D6
OSEL
R/W
0
D5
ISEL1
R/W
0
D4
ISEL0
R/W
0
D3
ICKS1
R/W
1
D2
ICKS0
R/W
0
D1
OCKS1
R/W
1
D0
OCKS0
R/W
0
OCKS1-0: OMCLK Frequency Select for Master mode (Table 5)
Initial values are “10”.
ICKS1-0: MCLK2 Frequency Select for Master mode (Table 4)
Initial values are “10”.
ISEL1-0: Input Port Select
Initial values are “00”.
ISEL1
0
0
1
1
ISEL0
Input PORT
Default
0
PORT1
1
PORT2
0
DIR
1
N/A
Table 19. Input PORT Select
OSEL: Output Port Select
Initial values are “0”.
OSEL
Output PORT
Default
0
PORT3
1
PORT2
Table 20. Output PORT Select
BYPS: Select Bypass mode
0 : SRC mode (Default)
1 : Bypass mode
When BYPS bit = “1”, the AK4122 outputs the clocks (BICK, LRCK) and data that is input by input port
without SRC.
MS0267-E-02
2004/07
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ASAHI KASEI
Addr Register Name
02H Audio Interface Format
R/W
Default
DIF1-0:
[AK4122]
D7
0
RD
0
D6
0
RD
0
D5
0
RD
0
D4
ODIF
R/W
0
D3
IDIF1
R/W
0
D2
IDIF0
R/W
1
D1
DIF1
R/W
0
D0
DIF0
R/W
1
D5
EFH1
R/W
0
D4
EFH0
R/W
1
D3
IPS1
R/W
0
D2
IPS0
R/W
0
D1
OPS1
R/W
0
D0
OPS0
R/W
0
Audio Interface Format for PORT1 (Table 8)
Initial values are “01”.
IDIF1-0: Audio Interface Format for PORT2 (Table 9)
Initial values are “01”.
ODIF: Audio Interface Format for PORT3 (Table 10)
Initial values are “0”.
Addr Register Name
03H DIR Control
R/W
Default
D7
CS12
R/W
0
D6
AMUTE
R/W
1
OPS1-0:
Output Through Data Select for TX (Table 15)
Initial values are “00”.
IPS1-0:
Input Recovery Data Select (Table 14)
Initial values are “00”.
EFH1-0:
Interrupt 0 pin Hold Count Select
Initial values are “01”.
LRCK of Table 21 is DIR’s LRCK, the hold time scales with 1/fs.
EFH1
0
0
1
1
EFH0
Hold Count
0
512LRCK
1
1024LRCK
0
2048LRCK
1
4096LRCK
Table 21. Hold count select
Default
AMUTE: Auto Mute Control
0 : Normal operation
1 : Auto Mute (Default)
When AMUTE bit = “1”, SDTIO and SDTO are muted automatically when the AK4122 detects unlock,
Non-Audio or Non-PCM/DTS-CD.
CS12: Channel Status select
0 : Channel 1 (Default)
1 : Channel 2
This bit selects that channel status is used to derive C-bit buffers, AUDN, PEM, FS3-0, Pc, Pd and CRC.
MS0267-E-02
2004/07
- 39 -
ASAHI KASEI
Addr Register Name
04H INT0 Mask
R/W
Default
[AK4122]
D7
MULK0
R/W
0
MQIT0:
Mask enable for QINT bit
0 : Mask disable
1 : Mask enable
MCIT0:
Mask enable for CINT bit
0 : Mask disable
1 : Mask enable
MSTC0:
Mask enable for STC bit
0 : Mask disable
1 : Mask enable
D6
MPAR0
R/W
0
D5
MAUT0
R/W
1
D4
MV0
R/W
1
D3
MAUD0
R/W
1
D2
MSTC0
R/W
1
D1
MCIT0
R/W
1
D0
MQIT0
R/W
1
MAUD0: Mask enable for AUDN bit
0 : Mask disable
1 : Mask enable
MV0:
Mask enable for V bit
0 : Mask disable
1 : Mask enable
MAUT0: Mask enable for AUTO bit
0 : Mask disable
1 : Mask enable
MPAR0: Mask enable for PAR bit
0 : Mask disable
1 : Mask enable
MULK0: Mask enable for UNLCK bit
0 : Mask disable
1 : Mask enable
The factor which mask bit is set to “0” affects INT0 and INT2 pins operation.
MS0267-E-02
2004/07
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ASAHI KASEI
Addr Register Name
05H INT1 Mask
R/W
Default
[AK4122]
D7
MULK1
R/W
1
MQIT1:
Mask enable for QINT bit
0 : Mask disable
1 : Mask enable
MCIT1:
Mask enable for CINT bit
0 : Mask disable
1 : Mask enable
MSTC1:
Mask enable for STC bit
0 : Mask disable
1 : Mask enable
D6
MPAR1
R/W
1
D5
MAUT1
R/W
0
D4
MV1
R/W
0
D3
MAUD1
R/W
0
D2
MSTC1
R/W
1
D1
MCIT1
R/W
1
D0
MQIT1
R/W
1
MAUD1: Mask enable for AUDN bit
0 : Mask disable
1 : Mask enable
MV1:
Mask enable for V bit
0 : Mask disable
1 : Mask enable
MAUT1: Mask enable for AUTO bit
0 : Mask disable
1 : Mask enable
MPAR1: Mask enable for PAR bit
0 : Mask disable
1 : Mask enable
MULK1: Mask enable for UNLCK bit
0 : Mask disable
1 : Mask enable
The factor which mask bit is set to “0” affects INT1 pin operation.
MS0267-E-02
2004/07
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ASAHI KASEI
Addr Register Name
06H DAT Mask & DTS Detect
R/W
Default
[AK4122]
D7
0
RD
0
D6
0
RD
0
D5
0
RD
0
D4
0
RD
0
D3
DTS16
R/W
1
D2
DTS14
R/W
1
D1
MDAT1
R/W
1
D0
MDAT0
R/W
1
MDAT0: Mask enable for DAT bit
0 : Mask disable
1 : Mask enable
The factor which mask bit is set to “0” affects INT0 and INT2 pins operation.
MDAT1: Mask enable for DAT bit
0 : Mask disable
1 : Mask enable
The factor which mask bit is set to “0” affects INT1 pin operation.
DTS14:
DTS-CD 14bit Sync Word Detect
0 : No detect
1 : Detect (Default)
DTS16:
DST-CD 16bit Sync Word Detect
0 : No detect
1 : Detect (Default)
MS0267-E-02
2004/07
- 42 -
ASAHI KASEI
Addr Register Name
07H Receiver Status 0
R/W
Default
[AK4122]
D7
UNLCK
RD
0
D6
PAR
RD
0
D5
AUTO
RD
0
D4
V
RD
0
D3
AUDN
RD
0
D2
STC
RD
0
D1
CINT
RD
0
D0
QINT
RD
0
QINT: Q-subcode Buffer Interrupt
0 : No change
1 : Changed
This bit goes to “1” when Q-subcode stored in register addresses 13H to 1CH is updated.
CINT: Channel Status Buffer Interrupt
0 : No change
1 : Changed
This bit goes to “1” when C-bit stored in register addresses 0AH to 0EH changes.
STC:
Sampling Frequency or Pre-emphasis Information Change Detection
0 : No detect
1 : Detect
This bit goes to “1” when either the FS3-0 or PEM bit changes.
AUDN:
V:
Validity Bit
0 : Valid
1 : Invalid
AUTO:
PAR:
Audio Bit Output
0 : Audio
1 : Non audio
This bit is made by encoding channel status bits.
Non-PCM or DTS-CD Bit Steam Auto Detection
0 : No detect
1 : Detect
This bit outputs the OR’ed value of NPCM and DTSCD bits.
Parity Error or Bi-phase Error Status
0 : No error
1 : Error
This bit goes to “1” if a parity error or biphase error is detected in the sub-frame.
UNLCK: PLL Lock Status
0 : Lock
1 : Unlock
QINT, CINT and STC bits are initialized when 07H is read.
MS0267-E-02
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ASAHI KASEI
Addr Register Name
08H Receiver Status 1
R/W
Default
[AK4122]
D7
DAT
RD
0
D6
DTSCD
RD
0
D5
NPCM
RD
0
D4
PEM
RD
0
D3
FS3
RD
0
D2
FS2
RD
0
D1
FS1
RD
0
D0
FS0
RD
1
FS3-0: Sampling Frequency Detection (Table 17)
PEM:
NPCM:
Pre-emphasis Detect (Table 18)
0 : OFF
1 : ON
This bit is made by encoding the channel status bits.
Non-PCM Bit Stream Auto Detection
0 : No detect
1 : Detect
DTSCD: DTS-CD Bit Stream Auto Detect
0 : No detect
1 : Detect
DAT:
DAT Start ID Detect
0 : No detect
1 : Detect
When the category code shows DAT, “1” when the Start ID of DAT is detected. Reading 08H register
resets it.
DAT bit is initialized when 08H is read.
Addr Register Name
09H Receiver Status 2
R/W
Default
D7
0
RD
0
D6
0
RD
0
D5
0
RD
0
D4
0
RD
0
D3
0
RD
0
D2
0
RD
0
D1
CCRC
RD
0
D0
QCRC
RD
0
QCRC: Cyclic Redundancy Check for Q-subcode
0 : No error
1 : Error
CCRC: Cyclic Redundancy Check for Channel Status
0 : No error
1 : Error
This bit is enabled only in professional mode and only for the channel selected by the CS12 bit.
MS0267-E-02
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ASAHI KASEI
Addr
0AH
0BH
0CH
0DH
0EH
Register Name
RX Channel Status Byte 0
RX Channel Status Byte 1
RX Channel Status Byte 2
RX Channel Status Byte 3
RX Channel Status Byte 4
R/W
Default
CR39-0:
Addr
0FH
10H
11H
12H
PD15-0:
Addr
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
D7
CR7
CR15
CR23
CR31
CR39
D6
CR6
CR14
CR22
CR30
CR38
D5
CR5
CR13
CR21
CR29
CR37
D4
CR4
CR12
CR20
CR28
CR36
D3
CR3
CR11
CR19
CR27
CR35
D2
CR2
CR10
CR18
CR26
CR34
D1
CR1
CR9
CR17
CR25
CR33
D0
CR0
CR8
CR16
CR24
CR32
D2
PC2
PC10
PD2
PD10
D1
PC1
PC9
PD1
PD9
D0
PC0
PC8
PD0
PD8
D2
Q4
Q12
Q20
Q28
Q36
Q44
Q52
Q60
Q68
Q76
D1
Q3
Q11
Q19
Q27
Q35
Q43
Q51
Q59
Q67
Q75
D0
Q2
Q10
Q18
Q26
Q34
Q42
Q50
Q58
Q66
Q74
RD
Not initialized
Receiver Channel Status Byte 4-0
All 40 bits are updated at the same time every block (192 frames) cycle.
Register Name
Burst Preamble Pc Byte 0
Burst Preamble Pc Byte 1
Burst Preamble Pd Byte 0
Burst Preamble Pd Byte 1
R/W
Default
PC15-0:
[AK4122]
D7
PC7
PC15
PD7
PD15
D6
PC6
PC14
PD6
PD14
D5
PC5
PC13
PD5
PD13
D4
PC4
PC12
PD4
PD12
D3
PC3
PC11
PD3
PD11
RD
Not initialized
Burst Preamble Pc Byte 0 and 1
Burst Preamble Pd Byte 0 and 1
Register Name
Q-subcode Address / Control
Q-subcode Track
Q-subcode Index
Q-subcode Minute
Q-subcode Second
Q-subcode Frame
Q-subcode Zero
Q-subcode ABS Minute
Q-subcode ABS Second
Q-subcode ABS Frame
R/W
Default
D7
Q9
Q17
Q25
Q33
Q41
Q49
Q57
Q65
Q73
Q81
D6
Q8
Q16
Q24
Q32
Q40
Q48
Q56
Q64
Q72
Q80
D5
Q7
Q15
Q23
Q31
Q39
Q47
Q55
Q63
Q71
Q79
D4
Q6
Q14
Q22
Q30
Q38
Q46
Q54
Q62
Q70
Q78
D3
Q5
Q13
Q21
Q29
Q37
Q45
Q53
Q61
Q69
Q77
RD
Not initialized
Q81-2: Q-subcode
All 80 bits are updated at the same time every sync code cycle for Q-subcode.
MS0267-E-02
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ASAHI KASEI
[AK4122]
Burst Preambles in Non-PCM Bitstreams
sub-frame of IEC60958
0
3 4
preamble
7 8
Aux.
11 12
27 28 29 30 31
LSB
MSB V U C P
16 bits of bitstream
0
Pa Pb Pc Pd
15
Burst_payload
stuffing
repetition time of the burst
Figure 26. Data Structure of IEC60958
Preamble word
Pa
Pb
Pc
Pd
Length of field
Contents
16 bits
sync word 1
16 bits
sync word 2
16 bits
Burst info
16 bits
Length code
Table 22. Burst Preamble Word
MS0267-E-02
Value
0xF872
0x4E1F
see Table 23
numbers of bits
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ASAHI KASEI
[AK4122]
Repetition time of burst
in IEC60958 frames
Bits of Pc Value
Contents
0-4
data type
NULL data
Dolby AC-3 data
reserved
PAUSE
MPEG-1 Layer1 data
MPEG-1 Layer2 or 3 data or MPEG-2 without extension
MPEG-2 data with extension
MPEG-2 AAC ADTS
MPEG-2, Layer1 Low sample rate
MPEG-2, Layer2 or 3 Low sample rate
reserved
DTS type I
DTS type II
DTS type III
ATRAC
ATRAC2/3
reserved
reserved, shall be set to “0”
error-flag indicating a valid burst_payload
error-flag indicating that the burst_payload may contain
errors
data type dependent info
bit stream number, shall be set to “0”
Table 23. Field of Burst Information Pc
7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16-31
0
0
1
8-12
13-15
0
5, 6
MS0267-E-02
≤ 4096
1536
384
1152
1152
1024
384
1152
512
1024
2048
512
1024
2004/07
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ASAHI KASEI
[AK4122]
Non-PCM Bitstream Timing
(1) When Non-PCM preamble does not arrive within 4096 frames
PDN pin
Bit stream
Pa Pb Pc1 Pd1
Pa Pb Pc2 Pd2
Repetition time
Pa Pb Pc3 Pd3
>4096 frames
AUTO bit
Pc Register
“0”
Pd Register
“0”
Pc1
Pc3
Pc2
Pd1
Pd3
Pd2
Figure 27. Timing example 1
(2) When Non-PCM bitstream stops (when MULK0=0)
INT0 hold time
INT0 pin
<20mS (Lock time)
Bit stream
Pa Pb Pc1 Pd1
Stop
Pa Pb Pcn Pdn
2~3 Syncs (B,M or W)
<Repetition time
AUTO bit
Pc Register
Pd Register
Pc0
Pcn
Pc1
Pd0
Pd1
Pdn
Figure 28. Timing example 2
MS0267-E-02
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ASAHI KASEI
[AK4122]
SYSTEM DESIGN
Figure 29 shows the typical system connection diagram. An evaluation board is available which demonstrates application
circuits, the optimum layout, power supply arrangements and measurement results.
• PORT2, PORT3 : Slave Mode
Digital Supply
3.0 ~ 3.6V
uP & DSP
DSP3
10µ
fso
0.1µ
48
47
46
45
44
43
42
41
40
39
38
37
CCLK
CSN
BVSS
DVDD
DVSS
OMCLK
LRCK
BICK
SDTO
TX
INT1
INT0
1 CDTI
SDTIO 36
2 CDTO
BICK2 35
3 TST1
LRCK2 34
4 INT2
MCLK2 33
5 TST2
DVDD 32
Top View
6 TST3
7 M/S2
0.1µ
10µ
Digital Supply
3.0 ~ 3.6V
DVSS 31
SDTI 30
DSP1
BICK1 29
8 M/S3
LRCK1 28
9 SMUTE
10 TST4
PDN 27
11 TST5
AVSS 26
fsi
Reset
RX1
TST7
RX2
TST8
RX3
TST9
RX4
TST10
TST11
2.2µ
TST6
470Ω
AVDD
R 25
AVSS
12 FILT
2.2n
DSP2
fsi
13
14
15
16
17
18
19
20
21
22
23
24
12kΩ
0.1µ
10µ
Shield
Analog Supply
3.0 ~ 3.6V
Shield
Shield
Shield
Shield
S/PDIF
sources
Note:
- AVSS, BVSS and DVSS of the AK4122 should be distributed separately from the ground of external digital
devices (MPU, DSP etc.).
- All digital input pins should not be left floating.
Figure 29. Typical Connection Diagram
MS0267-E-02
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ASAHI KASEI
[AK4122]
1. Grounding and Power Supply Decoupling
The AK4122 requires careful attention to power supply and grounding arrangements. Alternatively if AVDD and DVDD
are supplied separately, the power up sequence is not critical. AVSS, BVSS and DVSS of the AK4122 must be
connected to analog ground plane. System analog ground and digital ground should be connected together near to where
the supplies are brought onto the printed circuit board. Decoupling capacitors should be as near to the AK4122 as possible,
with the small value ceramic capacitor being the nearest.
2. PLL Loop-Filter
The C1 (2.2µF) and R1 (470Ω) should be connected in series and attached between FILT pin and AVSS in parallel with C2
(2.2nF). Please be careful the noise onto the FILT pin.
AK4122
FILT
R1
C2
C1
AVSS
Parameter
Recommended value
Accuracy
R1
470Ω
−5% ∼ +5%
C1
2.2µF
−50% ∼ +50%
C2
2.2nF
−50% ∼ +50%
Note: The accuracy includes temperature dependence.
Figure 30. Loop Filter for SRC
The R2 (12kΩ) should be connected in series and attached between R pin and AVSS. Please be careful the noise onto the R
pin.
AK4122
R
R2
AVSS
Parameter
Recommended value
Accuracy
R2
12kΩ
−5% ∼ +5%
Note: The accuracy includes temperature dependence.
Figure 31. Loop Filter for DIR
MS0267-E-02
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ASAHI KASEI
[AK4122]
PACKAGE
48pin LQFP(Unit: mm)
1.70Max
9.0 ± 0.2
0.13 ± 0.13
7.0
36
25
24
48
13
7.0
37
1
9.0 ± 0.2
1.40 ± 0.05
12
0.16 ± 0.07
0.5
0.22 ± 0.08
0.10 M
0° ∼ 10°
0.10
0.5 ± 0.2
Material & Lead finish
Package molding compound:
Lead frame material:
Lead frame surface treatment:
Epoxy
Cu
Solder (Pb free) plate
MS0267-E-02
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ASAHI KASEI
[AK4122]
MARKING
AKM
AK4122VQ
XXXXXXX
1
XXXXXXXX: Date code identifier
MS0267-E-02
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ASAHI KASEI
[AK4122]
Revision History
Date (YY/MM/DD)
03/10/03
04/01/27
Revision
00
01
Reason
First Edition
Spec Change
Page
Contents
10, 11
04/07/23
02
Add Spec
Add Spec
9
16, 18
SWITCHING CHARACTERISTICS
Audio Interface Timing
BICK1/BICK2/BICK Period@Slave mode:
min 160ns → 1/64/fs
Add FILTER CHARACTERISTICS
Add a sentence:
“The DIF1-0 bits of the PORT1 should be set a
value except “10” (I2S Compatible) when the DIR
is selected as an input port.”
IMPORTANT NOTICE
• These products and their specifications are subject to change without notice. Before considering any
use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized
distributor concerning their current status.
• AKM assumes no liability for infringement of any patent, intellectual property, or other right in the
application or use of any information contained herein.
• Any export of these products, or devices or systems containing them, may require an export license
or other official approval under the law and regulations of the country of export pertaining to customs
and tariffs, currency exchange, or strategic materials.
• AKM products are neither intended nor authorized for use as critical components in any safety, life
support, or other hazard related device or system, and AKM assumes no responsibility relating to any
such use, except with the express written consent of the Representative Director of AKM. As used
here:
a. A hazard related device or system is one designed or intended for life support or maintenance of
safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its
failure to function or perform may reasonably be expected to result in loss of life or in significant
injury or damage to person or property.
b. A critical component is one whose failure to function or perform may reasonably be expected to
result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or
system containing it, and which must therefore meet very high standards of performance and
reliability.
• It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or
otherwise places the product with a third party to notify that party in advance of the above content and
conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and
hold AKM harmless from any and all claims arising from the use of said product in the absence of such
notification.
MS0267-E-02
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