[AK4128A]
AK4128A
8ch 216kHz / 24-Bit Asynchronous SRC
GENERAL DESCRIPTION
The AK4128A is an 8ch digital sample rate converter (SRC). The input sample rate ranges from 8kHz to
216kHz. The output sample rate is from 8kHz to 216kHz. The AK4128A has an internal Oscillator and
does not need any external master clocks. It contributes simplifying a system configuration. The
AK4128A supports master mode and TDM data interface, enabling simultaneous input of asynchronous
stereo data. The AK4128A is suitable for the application interfacing to different sample rates such as
multi-channel high-end Car Audio Systems and DVD recorders.
FEATURES
8 channels input/output
Asynchronous Sample Rate Converter
Input Sample Rate Range (FSI): 8kHz 216kHz
Output Sample Rate Range (FSO): 8kHz 216kHz
Input to Output Sample Rate Ratio: 1/6 to 6
THD+N: 130dB
Dynamic Range: 140dB (A-weighted)
I/F format: MSB justified, LSB justified and I2S compatible and TDM
Oscillator for Internal Operation Clock
Clock for Master mode: 128/256/384/512/768fso
On-chip X’tal oscillator
Digital De-emphasis Filter (32kHz, 44.1kHz and 48kHz)
Soft Mute Function
SRC Bypass mode (Master/Slave)
μP Interface: I²C bus
Power Supply: AVDD, DVDD1-4: 3.0 3.6V (typ. 3.3V)
Ta = 20 85C (AK4128AEQ), 40 85C (AK4128AVQ)
Package: 64LQFP
MS1242-E-02
2014/03
-1-
DITHER
SMT1
SMT0
SMSEMI
SMUTE
VSS2-5
DVDD1-4
INAS
DEM1
DEM0
IDIF2
IDIF1
IDIF0
[AK4128A]
OLRCK
OBICK
SRC1
Bypass
Input
Serial
Audio
I/F
IBICK1
ILRCK1
SDTI1
DEM
FIR
SRC
SMUTE
+
Dither
0.5 LSB
SRC
DEM
FIR
+
SMUTE
SRC
SRC
Dither
DEM
FIR
+
SRC
Dither
DEM
FIR
SRC4
+
SMUTE
SRC
SRC
Dither
IMCLK
PDN
PM1
PM2
Internal
OSC
uP
I/F
CAD0
SDTO3
0.5 LSB
Bypass
Input
Serial
Audio
I/F
IBICK4
ILRCK4
SDTI4
SDTO4
0.5 LSB
UNLOCK
Bypass
X’tal
Osc
MCKO
Clock
Div
SDA SCL XTO OMCLK/XTI
SPB
SDTO2
SRC3
SMUTE
SRC
ODIF1
ODIF0
Output
Serial
Audio
I/F
0.5 LSB
Bypass
Input
Serial
Audio
I/F
IBICK3
ILRCK3
SDTI3
OBIT1
OBIT2
SRC2
Bypass
Input
Serial
Audio
I/F
IBICK2
ILRCK2
SDTI2
SDTO1
Internal
Regulator
SRC
CM2 CM1 CM0
REF
AVDD
VSS1
VD18
DITHER
SMT1
SMT0
SMSEMI
SMUTE
VSS2-5
DVDD1-4
INAS
DEM1
DEM0
IDIF2
IDIF1
IDIF0
Figure 1. AK4128A Block Diagram (Synchronous mode INAS pin = “L”)
OLRCK
OBICK
SRC1
Bypass
Input
Serial
Audio
I/F
IBICK1
ILRCK1
SDTI1
DEM
FIR
SRC
SMUTE
SRC
Dither
+
IBICK2
ILRCK2
SDTI2
DEM
FIR
SRC
SMUTE
SRC
DEM
FIR
SRC
0.5LSB
SRC
+
DEM
FIR
SRC
SRC4
SMUTE
SRC
Dither
IMCLK
PDN
PM1
PM2
Internal
OSC
uP
I/F
CAD0
X’tal
Osc
SDA SCL XTO OMCLK/XTI
SPB
SDTO3
0.5LSB
Bypass
Input
Serial
Audio
I/F
+
SDTO4
0.5LSB
UNLOCK
Bypass
Clock
Div
CM2 CM1 CM0
SDTO2
SRC3
SMUTE
Dither
IBICK4
ILRCK4
SDTI4
Output
Serial
Audio
I/F
+
Bypass
Input
Serial
Audio
I/F
ODIF1
ODIF0
SRC2
Dither
IBICK3
ILRCK3
SDTI3
OBIT1
OBIT0
0.5LSB
Bypass
Input
Serial
Audio
I/F
SDTO1
MCKO
SRC
Internal
Regulator
REF
AVDD
VSS1
VD18
Figure 2. AK4128A Block Diagram (Asynchronous mode INAS pin = “H”)
MS1242-E-02
2014/03
-2-
[AK4128A]
■ Compatibility with AK4126
(1) Specifications
Parameter
Stereo Inputs
Asynchronous Mode
Internal Clock
Bypass Mode
AK4126
Not Available
Synchronous Mode Only
Internal PLL
The PLL2-0 pins must be set
according to the PLL reference clock.
#61 pin: A pin for external devices of
PLL filter.
Not Available
AK4128A
Available
The INAS pin controls synchronous and
asynchronous modes.
Internal Regulator + Internal Oscillator
PLL reference clock select is not needed since
internal oscillator generates the clock.
#61 pin: A capacitor pin for the internal regulator.
192kHz
Available
Controlled by CM2-0 pins or BYPS bit.
Available
Controlled by CM2-0 pins
216kHz
64fs
256fs
Not Available
Not Available
Not Available
Available
Available
Available
Controlled by IDIF2-0 pins or IDIF2-0 bits (Input)
Controlled by TDM pin (Output)
Individual Setting Available
Individual setting is available by setting SMUTE4-1
bits in serial control mode.
Individual Setting Available
Individual setting is available by DEM41-40, 31-30,
21-20, 11-10 bits in serial control mode.
Individual Setting Available
Individual setting is available by IDIF42-40, 32-30,
22-20, 12-10 bits in serial control mode.
Available
Parallel and Serial control modes are selected by the
SPB pin.
FSI:FSO Ratio Change Detect
Detects over-current/voltage of the 1.8V outputs.
Master Mode for
Output Ports
Maximum FSI and
FSO
Maximum IBICK and
OBICK Frequency
X’tal Oscillator
Master Clock Output
TDM Mode
Not Available
Soft Mute
All channels are controlled together.
De-emphasis Filter
All channels are controlled together.
Audio Format for Input
port.
All channels are controlled together.
I2C
Not Available
UNLOCK pin
Detects PLL unlock.
MS1242-E-02
2014/03
-3-
[AK4128A]
(2) Pins
Pin#
AK4126
AK4128A pin
1
2
7
14
15
16
17
18
32
33
42
47
48
49
51
54
55
56
57
58
59
61
NC
TEST0
TST0
TST1
TST2
NC
TST3
TST4
TST5
NC
TST6
TEST4
NC
NC
TST8
PLL2
PLL1
PLL0
TST9
TST10
NC
FILT
IBICK2
IMCLK
SDTI4
ILRCK3
IBICK3
ILRCK4
IBICK4
INAS
PM2
TDM
SDTO4
OMCLK/XTI
XTO
MCKO
CAD0
TST1
SMSEMI
TST2
SCL
SDA
SPB
VD18
63
TST11
TST3
64
NC
*: An external device is needed for the No 61 pin.
ILRCK2
AK4126
AK4128A
6ch mode AK4126 compatible
(PM2/1 pin = “LL”)
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L or H
L or H
L or H
L
L
L
*
AK4126: “Open”
AK4128A: “L”
L
AK4128A
FILT
VD18
R
C2
1uF
C1
Figure 3. AK4126
(Please refer to the AK4126 datasheet about external devices.)
MS1242-E-02
Figure 4. AK4128A
2014/03
-4-
[AK4128A]
■ Ordering Guide
20 +85C
64pin LQFP (0.5mm pitch)
40 +85C
64pin LQFP (0.5mm pitch)
Evaluation Board for AK4128A
AK4128AEQ
AK4128AVQ
AKD4128A
DVDD3
SDTO4
SDTO1
SDTO2
SDTO3
ODIF0
ODIF1
CM0
CM1
CM2
TDM
42
41
40
39
38
37
36
35
34
33
OBICK
45
VSS4
OLRCK
46
43
OMCLK/XTI
47
44
XTO
48
■ Pin Layout
MCKO
49
32
PM2
TST0
50
31
OBIT1
CAD0
51
30
OBIT0
DVDD4
52
29
PM1
VSS5
53
28
DEM1
TST1
54
27
DEM0
SMSEMI
55
26
SMT1
TST2
56
25
SMT0
SCL
57
24
PDN
SDA
58
23
DITHER
Top View
SPB
59
22
SMUTE
AVDD
60
21
VSS3
VD18
61
20
DVDD2
VSS1
62
19
UNLOCK
TST3
63
18
INAS
17
IBICK4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
IMCLK
ILRCK1
IBICK1
DVDD1
VSS2
SDTI4
SDTI1
SDTI2
SDTI3
IDIF0
IDIF1
IDIF2
ILRCK3
IBICK3
ILRCK4
64
IBICK2
ILRCK2
MS1242-E-02
2014/03
-5-
[AK4128A]
PIN / FUNCTION
No.
Pin Name
I/O
1
IBICK2
I
2
3
4
5
6
7
8
9
10
11
12
13
IMCLK
ILRCK1
IBICK1
DVDD1
VSS2
SDTI4
SDTI1
SDTI2
SDTI3
IDIF0
IDIF1
IDIF2
I
I
I
I
I
I
I
I
I
I
14
ILRCK3
I
15
IBICK3
I
16
ILRCK4
I
17
IBICK4
I
18
INAS
I
19
UNLOCK
O
20
21
22
23
DVDD2
VSS3
SMUTE
DITHER
I
I
24
PDN
I
25
26
27
28
29
30
31
32
SMT0
SMT1
DEM0
DEM1
PM1
OBIT0
OBIT1
PM2
I
I
I
I
I
I
I
I
33
TDM
I
Function
Audio Serial Data Clock #2 Pin
When the INAS pin = “L”, this pin should be connected to VSS2-5.
Master Clock Input Pin for Input PORT
Input Channel Clock #1 Pin
Audio Serial Data Clock #1 Pin
Digital Power Supply Pin, 3.0 3.6V
Digital Ground Pin
Audio Serial Data Input #4 Pin
Audio Serial Data Input #1 Pin
Audio Serial Data Input #2 Pin
Audio Serial Data Input #3 Pin
Audio Interface Format #0 Pin for Input PORT (Note 2)
Audio Interface Format #1 Pin for Input PORT (Note 2)
Audio Interface Format #2 Pin for Input PORT (Note 2)
Input Channel Clock #3 Pin
When the INAS pin = “L”, this pin should be connected to VSS2-5.
Audio Serial Data Clock #3 Pin
When the INAS pin = “L”, this pin should be connected to VSS2-5.
Input Channel Clock #4 Pin
When the INAS pin = “L”, this pin should be connected toVSS2-5.
Audio Serial Data Clock #4 Pin
When the INAS pin = “L”, this pin should be connected to VSS2-5.
Asynchronous Mode Select Pin.
“L”(connected to the ground): Synchronous mode.
“H”(connected to DVDD1-4) : Asynchronous mode.
Unlock Status Pin
When the PDN pin= “L”, this pin outputs “H”.
Digital Power Supply Pin, 3.0 3.6V
Digital Ground Pin
Soft Mute Pin (Note 3)
“H”: Soft Mute, “L”: Normal Operation
Dither Enable Pin
“H”: Dither ON, “L”: Dither OFF
Power-Down Mode Pin
“H”: Power up, “L”: Power down reset and initializes the control register.
The AK4128A should be reset once by bringing PDN pin = “L” upon power-up.
Soft Mute Timer Select #0 Pin
Soft Mute Timer Select #1 Pin
De-emphasis Control #0 Pin (Note 4)
De-emphasis Control #1 Pin (Note 4)
Channel Mode Select #1 Pin
Bit Length Select #0 Pin for Output Data
Bit Length Select #1 Pin for Output Data
Channel Mode Select #2 Pin
TDM Format Select Pin.
“L”(connected to the ground): Stereo mode.
“H”(connected to DVDD1-4) : TDM mode.
MS1242-E-02
2014/03
-6-
[AK4128A]
No.
34
35
36
37
38
Pin Name
CM2
CM1
CM0
ODIF1
ODIF0
I/O
I
I
I
I
I
39
SDTO3
O
40
SDTO2
O
41
SDTO1
O
42
SDTO4
O
43
44
VSS4
DVDD3
-
45
OBICK
I/ O
46
OLRCK
I/ O
47
OMCLK/XTI
I
48
XTO
O
49
MCKO
O
50
TST0
I
51
CAD0
I
52
53
54
DVDD4
VSS5
TST1
I
55
SMSEMI
I
56
TST2
I
57
SCL
I
58
SDA
I/ O
59
SPB
I
Function
Clock Select or Mode Select #2 Pin for Output PORT
Clock Select or Mode Select #1 Pin for Output PORT
Clock Select or Mode Select #0 Pin for Output PORT
Audio Interface Format #1 Pin for Output PORT
Audio Interface Format #0 Pin for Output PORT
Audio Serial Data Output #3 Pin for Output PORT
When the PDN pin = “L”, the SDRO3 pin outputs “L”.
Audio Serial Data Output #2 Pin for Output PORT
When the PDN pin = “L”, the SDTO2 pin outputs “L”.
Audio Serial Data Output #1 Pin for Output PORT
When the PDN pin = “L”, the SDTO1 pin outputs “L”.
Audio Serial Data Output #4 Pin for Output PORT
When the PDN pin = “L”, the SDRO4 pin outputs “L”.
Digital Ground Pin
Digital Power Supply Pin, 3.0 3.6V
Audio Serial Data Clock Pin for Output PORT
When the PDN pin = “L” in master mode, the OBOCK pin outputs “L”.
Output Channel Clock Pin for Output PORT
When the PDN pin = “L” in master mode, the OBOCK pin outputs “L”.
External Master Clock Input / X’tal Input Pin
X’tal Output Pin
When the PDN pin = “L”, XTO outputs Hi-z.
Master Clock Output Pin
When the PM2 pin = “H” and PDN pin = “L”, the MCKO pin outputs “L”.
When the PM2 pin = “L” and PDN pin = “L”, the MCKO pin outputs Hi-z.
Test Pin. This pin should be connected to VSS2-5.
Chip Address 0 pin
This pin must be connected to VSS2-5 in parallel control mode (SPB pin = “L”).
Digital Power Supply Pin, 3.0 3.6V
Digital Ground Pin
Test Pin. This pin should be connected to VSS2-5.
Soft Mute Semi-auto Mode Setting Pin
“H”: Semi-auto, “L”: Manual Mode
Test Pin. This pin should be connected to VSS2-5.
I2C Control Data Clock Pin, (when the SPB pin= “H”)
Since there is a protection diode between this pin and DVDD1-4, connect pulled-up
resister to DVDD1-4 + 0.3V or less. This pin must be connected to the VSS2-5 in
parallel control mode (PSB pin= “L”).
I2C Control Data In/Out put Pin, (when the SPB pin= “H”)
Since there is a protection diode between this pin and DVDD1-4, connect pulled-up
resister to DVDD1-4 + 0.3V or less. This pin must be connected to the VSS2-5 in
parallel control mode (PSB pin= “L”).
Parallel/Serial Control Mode Select Pin
“H”: Serial Control Mode, “L”: Parallel Control Mode
MS1242-E-02
2014/03
-7-
[AK4128A]
No.
60
Pin Name
AVDD
I/O
-
Function
Analog Power Supply Pin, 3.0 3.6V
Digital Power Output Pin, Typ 1.8V
When the PDN pin= “L”, the DV18 pin outputs “L”. Current must not be taken
61 VD18
O
from this pin. A 1μF (±30%; including the temperature characteristics) capacitor
should be connected between this pin and DVSS. When this capacitor is polarized,
the positive polarity pin should be connected to the VD18 pin.
62 VSS1
Analog Ground Pin
Test Pin.
63 TST3
I
This pin should be connected to VSS2-5.
Input Channel Clock #2 Pin
64 ILRCK2
I
When INAS pin = “L”, this pin should be connected to VSS2-5.
Note: All input pins should not be left floating. DVDD1-4 must be connected to the same power supply.
Note 1. SPB, CM2-0, INAS, PM2-1, OBIT1-0, TDM, ODIF1-0, IDIF2-0 and CAD0 pin must be changed when the PDN
pin= “L”.
Note 2. In parallel control mode (SPB pin = “L”), IDIF2-0 pins control all SRC1~4 audio interface input formats.
In serial control mode (SPB pin = “H”), the setting of IDIF2-0 pins is ignored. The IDIF[12:10] bits setting is
reflected to SRC1, the IDIF[22:20] bits setting is reflected to SRC2, the IDIF[32:30] bits setting is reflected to
SRC3, and the IDIF[42:40] bits setting is reflected to SRC4.
Note 3. In parallel control mode (SPB pin = “L”), the SMUTE pin controls all SRC1~4 soft mute.
In serial control mode (SPB pin = “H”), the SUMUTE pin setting is ignored. The SMUTE1 bit setting is reflected
to SRC1, the SMUTE2 bit setting is reflected to SRC2, the SMUTE3 bit setting is reflected to SRC3, and the
SMUTE4 bit setting is reflected to SRC4.
Note 4. In parallel control mode (SPB pin= “L”), DEM1-0 pins control all SRC1~4 de-emphasis settings.
In serial control mode (SPB pin= “H”), setting of DEM1-0 pins is ignored. DEM[11:10] bits setting is reflected to
SRC1, DEM[21:20] bits setting is reflected to SRC2, DEM[31:30] bits setting is reflected to SRC3, and
DEM[41:40] bits setting is reflected to SRC4.
■ Handling of Unused Pins
The unused I/O pins should be processed appropriately as below.
Classification
Digital
Pin Name
IBICK2, IMCLK, SDTI3-4, ILRCK3,
IBICK3, ILRCK4, IBICK4, SMUTE,
DITHER, OMCLK/XTI, ILRCK2,
SDA, SCL, CAD0, TST0-3
UNLOCK, SDTO1-4, MCKO, XTO
MS1242-E-02
Setting
These pins must be connected to VSS2-5.
These pins must be open.
2014/03
-8-
[AK4128A]
ABSOLUTE MAXIMUM RATINGS
(VSS1-5=0V; Note 5)
Parameter
Symbol
min
max
Unit
Analog
AVDD
0.3
4.2
V
Power Supplies:
Digital
DVDD1-4
0.3
4.2
V
Input Current, Any Pin Except Supplies
IIN
10
mA
Digital Input Voltage
(Note 6)
VIND
0.3
DVDD1-4+0.3
V
AK4128AEQ
Ta
20
85
C
Ambient Temperature
(Power applied) (Note 7)
AK4128AVQ
Ta
40
85
C
Storage Temperature
Tstg
65
150
C
Note 5. All voltages with respect to ground. VSS1-5 must be connected to the same ground.
Note 6. IMCLK, IBICK4-1, ILRCK4-1, IDIF2-0, INAS, SUMTE, DITHER, PDN, SMT1-0, DEM1-0, PM2-1, OBIT1-0,
TDM, CM2-0, ODIF1-0, SDTO4-1, OBICK, OLRCK, OMCLK/XTI, CAD0, SMSEMI, SCL, SDA and SPB pins.
Note 7. In case that wiring density is 100%.
Note 8. DVDD1-4 pins must be connected to the same power supply.
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
(VSS1-5=0V; Note 5)
Parameter
Power Supplies:
(Note 9)
Symbol
min
typ
max
Unit
Analog
AVDD
3.0
3.3
3.6
V
Digital
DVDD1-4
3.0
3.3
3.6
V
Difference
AVDD - DVDD1-4
-0.3
0
+0.3
V
Note 5. All voltages with respect to ground. VSS1-5 must be connected to the same ground.
Note 8. DVDD1-4 pins must be connected to the same power supply.
Note 9. The power up sequence between AVDD and DVDD1-4 is not critical but the PDN pin must be “L” until all power
supplies are ON, then put the PDN pin to “H”.
WARNING: AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
MS1242-E-02
2014/03
-9-
[AK4128A]
SRC CHARACTERISTICS
(Ta=25C; AVDD=DVDD1-4=3.3V; VSS1-5=0V; Signal Frequency = 1kHz; data = 24bit;
Measurement bandwidth = 20Hz ~ FSO/2; unless otherwise specified.)
Parameter
Symbol
min
SRC Characteristics:
Resolution
Input Sample Rate
FSI
8
Output Sample Rate
FSO
8
THD+N
(Input = 1kHz, 0dBFS, Note 10)
FSO/FSI = 44.1kHz/48kHz
FSO/FSI = 48kHz/44.1kHz
FSO/FSI = 48kHz/192kHz
FSO/FSI = 192kHz/48kHz
Worst Case (FSO/FSI = 32kHz/176.4kHz)
Dynamic Range (Input = 1kHz, 60dBFS, Note 10)
FSO/FSI = 44.1kHz/48kHz
FSO/FSI = 48kHz/44.1kHz
FSO/FSI = 48kHz/192kHz
FSO/FSI = 192kHz/48kHz
Worst Case (FSO/FSI = 48kHz/32kHz)
132
Dynamic Range (Input = 1kHz, 60dBFS, A-weighted, Note 10)
FSO/FSI = 44.1kHz/48kHz
Ratio between Input and Output Sample Rate
FSO/FSI
1/6
Note 10. Measured by Audio Precision System Two Cascade.
typ
max
Unit
24
216
216
Bits
kHz
kHz
130
124
133
124
-
-91
dB
dB
dB
dB
dB
136
136
136
132
-
-
dB
dB
dB
dB
dB
140
6
dB
-
POWER CONSUMPTION
(Ta= 25C; AVDD=DVDD1-4=3.0~3.6V; VSS1-5=0V; Signal Frequency=1kHz; data=24bit; Asynchronous Input mode
(INAS pin = “H”), Output PORT: Master mode, OMCLK/XTI are input via a X’tal. PM2/1 pin = “H/L” 8ch mode, unless
otherwise specified.)
Parameter
min
typ
max
Unit
Power Supplies
Power Supply Current
Normal operation (PDN pin = “H”)
AVDD+DVDD1-4
FSI=FSO=48kHz: AVDD=DVDD1-4=3.3V (Note 12)
42
mA
FSI=FSO=192kHz: AVDD=DVDD1-4=3.3V (Note 13)
108
mA
: AVDD=DVDD1-4=3.6V (Note 14)
109
164
mA
Power down (PDN pin = “L”) (Note 11)
AVDD+DVDD1-4
10
100
A
Note 11. All digital input pins are held to VSS2-5.
Note 12. It is 41 [mA] (typ) when the OMCLK/XTI pin is supplied a 24.576MHz external clock and the output port is in
slave mode.
Note 13. It is 105 [mA] (typ) when the OMCLK/XTI pin is supplied a 24.576MHz external clock and the output port is in
slave mode.
Note 14. It is 106 [mA] (typ) when the OMCLK/XTI pin is supplied a 24.576MHz external clock and the output port is in
slave mode.
MS1242-E-02
2014/03
- 10 -
[AK4128A]
FILTER CHARACTERISTICS
(Ta= 25C; AVDD=DVDD1-4=3.0 3.6V)
Parameter
Symbol
min
typ
max
Unit
Digital Filter
0.4583FSI
Passband 0.01dB
0.985 FSO/FSI 6.000
PB
0
kHz
0.4167FSI
0.905 FSO/FSI 0.985
PB
0
kHz
0.3195FSI
0.714 FSO/FSI 0.905
PB
0
kHz
0.2852FSI
0.656 FSO/FSI 0.714
PB
0
kHz
0.2182FSI
0.536 FSO/FSI 0.656
PB
0
kHz
0.2177FSI
0.492 FSO/FSI 0.536
PB
0
kHz
0.1948FSI
0.452 FSO/FSI 0.492
PB
0
kHz
0.1458FSI
0.357 FSO/FSI 0.452
PB
0
kHz
0.1302FSI
0.324 FSO/FSI 0.357
PB
0
kHz
0.0917FSI
0.246 FSO/FSI 0.324
PB
0
kHz
0.0826FSI
0.226 FSO/FSI 0.246
PB
0
kHz
0.0583FSI
0.1667 FSO/FSI 0.226
PB
0
kHz
Stopband
0.985 FSO/FSI 6.000
SB
0.5417FSI
kHz
0.905 FSO/FSI 0.985
SB
0.5021FSI
kHz
0.714 FSO/FSI 0.905
SB
0.3965FSI
kHz
0.656 FSO/FSI 0.714
SB
0.3643FSI
kHz
0.536 FSO/FSI 0.656
SB
0.2974FSI
kHz
0.492 FSO/FSI 0.536
SB
0.2813FSI
kHz
0.452 FSO/FSI 0.492
SB
0.2604FSI
kHz
0.357 FSO/FSI 0.452
SB
0.2116FSI
kHz
0.324 FSO/FSI 0.357
SB
0.1969FSI
kHz
0.246 FSO/FSI 0.324
SB
0.1573FSI
kHz
0.226 FSO/FSI 0.246
SB
0.1471FSI
kHz
0.1667 FSO/FSI 0.226
SB
0.1020FSI
kHz
Passband Ripple
PR
0.01
dB
Stopband
0.985 FSO/FSI 6.000
SA
121.2
dB
Attenuation
0.905 FSO/FSI 0.985
SA
121.4
dB
0.714 FSO/FSI 0.905
SA
115.3
dB
0.656 FSO/FSI 0.714
SA
116.9
dB
0.536 FSO/FSI 0.656
SA
114.6
dB
0.492 FSO/FSI 0.536
SA
100.2
dB
0.452 FSO/FSI 0.492
SA
103.3
dB
0.357 FSO/FSI 0.452
SA
102.0
dB
0.324 FSO/FSI 0.357
SA
103.6
dB
0.246 FSO/FSI 0.324
SA
103.3
dB
0.226 FSO/FSI 0.246
SA
101.5
dB
0.1667 FSO/FSI 0.226
SA
73.2
dB
Group Delay
(Note 15)
GD
64
1/fs
Note 15. This value is the time from the rising edge of ILRCK after SDTI data is input to rising edge of OLRCK after the
SDTI data is output, when OLRCK data corresponds with ILRCK data.
MS1242-E-02
2014/03
- 11 -
[AK4128A]
DC CHARACTERISTICS
(Ta= 25C; AVDD=DVDD1-4=3.0 3.6V)
Parameter
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage
Except the SDA pin (Iout=400A)
Low-Level Output Voltage
Except the SDA pin (Iout=400A)
SDA pin
(Iout=3mA)
Input Leakage Current
Symbol
VIH
VIL
min
70%DVDD1-4
-
typ
-
max
30%DVDD1-4
Unit
V
V
VOH
DVDD1-4 0.4
-
-
V
VOL
VOL
Iin
-
-
-
-
0.4
0.4
10
V
V
A
SWITCHING CHARACTERISTICS
(Ta= 25C; AVDD=DVDD1-4=3.0 3.6V; CL=20pF)
Parameter
Symbol
min
typ
max
Unit
Master Clock Timing
fXTAL
11.2896
24.576
MHz
Crystal Oscillator Frequency
IMCLK Input
Frequency
fECLK
1.024
36.864
MHz
Duty
dECLK
40
50
60
%
OMCLK Input
128 FSO :
fCLK
1.024
27.648
MHz
Pulse Width Low
tCLKL
13
ns
Pulse Width High
tCLKH
13
ns
256 FSO :
fCLK
2.048
27.648
MHz
Pulse Width Low
tCLKL
13
ns
Pulse Width High
tCLKH
13
ns
384 FSO :
fCLK
3.072
36.864
MHz
Pulse Width Low
tCLKL
10
ns
Pulse Width High
tCLKH
10
ns
512 FSO :
fCLK
4.096
27.648
MHz
Pulse Width Low
tCLKL
13
ns
Pulse Width High
tCLKH
13
ns
768 FSO :
fCLK
6.144
36.864
MHz
Pulse Width Low
tCLKL
10
ns
Pulse Width High
tCLKH
10
ns
MCKO Output
Frequency
fMCK
1.024
36.864
MHz
Duty (Note 16)
dMCLK
40
50
60
%
Note 16. This is a value of MCKO output duty when the master clock for output ports is supplied by a crystal oscillator.
MS1242-E-02
2014/03
- 12 -
[AK4128A]
Input PORT LRCK for Stereo Mode (ILRCK1-4)
Frequency
Duty Cycle
Slave Mode
Output PORT LRCK for Stereo Mode (OLRCK)
Frequency
Slave mode
Master mode OMCLK Input 128FSO mode
Master mode OMCLK Input 256FSO mode
Master mode OMCLK Input 384FSO mode
Master mode OMCLK Input 512FSO mode
Master mode OMCLK Input 768FSO mode
Duty Cycle
Slave Mode
Master Mode
Input PORT LRCK for TDM256 Mode (ILRCK1)
Asynchronous Inputs Mode (INAS pin = “L”)
Frequency
“H” time (slave mode)
“L” time (slave mode)
Output PORT LRCK for TDM256 Mode (OLRCK)
Frequency
“H” time (slave mode)
“L” time (slave mode)
“H” time
(Master mode, TDM256 24bit MSB justified)
“L” time
(Master mode, TDM256 24bit I2S)
Audio Interface Timing
Input PORT ( Stereo Slave mode)
IBICK1-4 Period (FSI= 8kHz 54kHz)
(FSI=54kHz 108kHz)
(FSI=108kHz 216kHz)
IBICK1-4 Pulse Width Low
Pulse Width High
ILRCK1-4 Edge to IBICK1-4 “”(Note 17)
IBICK1-4 “” to ILRCK1-4 Edge (Note 17)
SDTI1-4 Hold Time from IBICK1-4 “”
SDTI1-4 Setup Time to IBICK1-4 “”
Input PORT (TDM256 slave mode)
IBICK1 Period
IBICK1 Pulse Width Low
Pulse Width High
ILRCK1 Edge to IBICK1 “”
(Note 17)
IBICK1 “” to ILRCK1 Edge
(Note 17)
SDTI1 Hold Time from IBICK1 “”
SDTI1 Setup Time to IBICK1 “”
Output PORT ( Stereo Slave mode)
OBICK Period (FSO= 8kHz 54kHz)
(FSO= 54kHz 108kHz)
(FSO=108kHz 216kHz)
OBICK Pulse Width Low
Pulse Width High
OLRCK Edge to OBICK “” (Note 17)
OBICK “” to OLRCK Edge (Note 17)
OLRCK to SDTO1-4 (MSB) (Except I2S mode)
OBICK “” to SDTO1-4
FSI
Duty
8
48
216
52
kHz
%
FSO
FSO
FSO
FSO
FSO
FSO
Duty
Duty
8
8
8
8
8
8
48
216
216
108
96
54
48
52
kHz
kHz
kHz
kHz
kHz
kHz
%
%
FSI
tLRH
tLRL
8
1/256FSI
1/256 FSI
48
kHz
ns
ns
FSO
tLRH
tLRL
8
1/256 FSO
1/256 FSO
48
kHz
ns
ns
tLRH
-
1/32 FSO
-
ns
tLRL
-
1/32 FSO
-
ns
tBCK
tBCK
tBCK
tBCKL
tBCKH
tLRB
tBLR
tSDH
tSDS
1/256 FSI
1/128 FSI
1/64 FSI
27
27
15
15
15
15
ns
ns
ns
ns
ns
ns
ns
ns
ns
tBCK
tBCKL
tBCKH
tLRB
tBLR
tSDH
tSDS
81
32
32
20
20
20
10
ns
ns
ns
ns
ns
ns
ns
tBCK
tBCK
tBCK
tBCKL
tBCKH
tLRB
tBLR
tLRS
tBSD
1/256 FSO
1/128 FSO
1/64 FSO
27
27
20
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
MS1242-E-02
50
50
50
20
20
2014/03
- 13 -
[AK4128A]
Output PORT (TDM256 slave mode)
OBICK Period
tBCK
81
ns
OBICK Pulse Width Low
tBCKL
32
ns
Pulse Width High
tBCKH
32
ns
OLRCK Edge to OBICK “”
(Note 17)
tLRB
20
ns
OBICK “” to OLRCK Edge
(Note 17)
tBLR
20
ns
OBICK “” to SDTO1
tBSD
20
ns
Output PORT (Stereo Master mode)
OBICK Frequency
fBCK
64 FSO
Hz
OBICK Duty
dBCK
50
%
OBICK “” to OLRCK Edge
tMBLR
20
20
ns
OBICK “” to SDTO1-4
tBSD
20
20
ns
Output PORT (TDM256 master mode)
OBICK Frequency
fBCK
256 FSO
Hz
OBICK Duty
dBCK
50(Note 19)
%
OBICK “” to OLRCK Edge
tMBLR
10
10
ns
OBICK “” to SDTO1
tBSD
20
20
ns
Reset Timing
PDN Pulse Width
(Note 18)
tPD
150
ns
Note 17. BICK rising edge must not occur at the same time as LRCK edge.
Note 18. The AK4128A can be reset by bringing the PDN pin = “L”.
Note 19. When OMCLK=512FSO. If the OMCLK=256FSO, OMCLK clock is though and output from the OBICK pin.
When OMCLK = 384FSO, dBCK= (tCLKH)/(tCLKH+1/fCLK) x100 [%] or (tCLKL)/(tCLKL+1/fCLK) x100
[%]. When OMCLK=768FSO, dBCK= (1/fCLK)/(3/fCLK) x100 [%].
OMCLK=384FSO
1/fCLK
1/fCLK
tCLKH
OMCLK pin
tCLKL
tCLKL
tCLKH
OBICK pin Ouput
(TDM256
Master mode)
tCLKL
1/fCLK
1/fCLK
OMCLK=768FSO
1/fCLK
1/fCLK
1/fCLK
OMCLK pin
1/fCLK
OBICK pin Output
(TDM256
Master mode)
3/fCLK
3/fCLK
MS1242-E-02
2014/03
- 14 -
[AK4128A]
Parameter
Symbol
min
typ
Control Interface Timing (I2C Bus):
SCL Clock Frequency
fSCL
Bus Free Time Between Transmissions
tBUF
1.3
Start Condition Hold Time
tHD:STA
0.6
(prior to first clock pulse)
Clock Low Time
tLOW
1.3
Clock High Time
tHIGH
0.6
Setup Time for Repeated Start Condition
tSU:STA
0.6
SDA Hold Time from SCL Falling (Note 20)
tHD:DAT
0
SDA Setup Time from SCL Rising
tSU:DAT
0.1
Rise Time of Both SDA and SCL Lines
tR
Fall Time of Both SDA and SCL Lines
tF
Setup Time for Stop Condition
tSU:STO
0.6
Pulse Width of Spike Noise
tSP
0
Suppressed by Input Filter
Capacitive load on bus
Cb
Note 20. Data must be held for sufficient time to bridge the 300 ns transition time of SCL.
MS1242-E-02
max
Unit
400
-
kHz
s
s
0.3
0.3
50
s
s
s
s
s
s
s
s
ns
400
pF
2014/03
- 15 -
[AK4128A]
■ Timing Diagram
1/fECLK
VIH
IMCLK(I)
VIL
tECLKH
tECLKL
dECLK
= tECLKH (or tECLKL) x fECLK x 100
1/fCLK
VIH
OMCLK(I)
VIL
tCLKH
tCLKL
1/fMCK
50%DVDD
MCKO(O)
tMCKH
tMCKL
dMCLK
= tMCKH (or tMCKL) x fMCK x 100
Figure 5. IMCLK, OMCLK, MCKO Clock Timing
•Stereo Mode and Slave Mode
1/FSI
VIH
LRCK1-4(I)
VIL
tLRCH
tLRCL
Duty
= tLRCH (or tLRCL) x FSI x 100
tBCK
VIH
IBICK1-4(I)
VIL
tBCKH
tBCKL
•TDM256 Mode and Slave Mode
1/FSI
VIH
LRCK1(I)
VIL
tLRH
tLRL
tBCK
VIH
IBICK1(I)
VIL
tBCKH
tBCKL
Figure 6. ILRCK1-4, IBICK1-4 Clock Timing
MS1242-E-02
2014/03
- 16 -
[AK4128A]
• Stereo Mode and Slave Mode
1/FSO
VIH
OLRCK(I)
VIL
tLRCH
tLRCL
Duty
= tLRCH (or tLRCL) x FSO x 100
tBCK
VIH
OBICK(I)
VIL
tBCKH
tBCKL
• TDM256 Mode and Slave Mode
1/FSO
VIH
OLRCK(I)
VIL
tLRH
tLRL
tBCK
VIH
OBICK(I)
VIL
tBCKH
tBCKL
Figure 7. OLRCK, OBICK, Clock Timing (Slave Mode)
• Stereo Mode and Master Mode
1/FSO
50%DVDD
OLRCK(O)
tLRCH
tLRCL
Duty
= tLRCH (or tLRCL) x FSO x 100
1/ fBCK
50%DVDD
OBICK(O)
tBICKH
tBICKL
dBCK
= tBICKH(or tBICKL) x fBCK x 100
• TDM256 Mode and Master Mode
1/FSO
50%DVDD
OLRCK(O)
24bit MSB justified
tLRH
1/FSO
50%DVDD
OLRCK(O)
24bit I2S
tLRL
1/ fBCK
50%DVDD
OBICK(O)
tBICKH
tBICKL
dBCK
= tBICKH(or tBICKL) x fBCK x 100
Figure 8. OLRCK, OBICK, Clock Timing (Master Mode)
MS1242-E-02
2014/03
- 17 -
[AK4128A]
VIH
ILRCK 1 -4
VIL
tBLR
tLRB
VIH
IBICK 1- 4
VIL
tSDS
tSDH
VIH
SDTI 1 -4
VIL
Figure 9. Input PORT Audio Interface Timing (Stereo Slave mode and TDM256 Slave Mode)
VI
H
VI
L
O LRCK
tBL
R
tLR
B
VI
H
VI
L
O BIC
K
tBS
D
tLR
S
SDT 1- 4
O
50 D VD
%
D
Figure 10. Output PORT Audio Interface Timing (TDM256 Slave mode & Stereo Slave mode)
MS1242-E-02
2014/03
- 18 -
[AK4128A]
OLRCK
50%DVDD
tMBLR
50%DVDD
OBICK
tBSD
50%DVDD
SDTO1-4
Figure 11. Output PORT Audio Interface Timing (TDM256 Master mode & Stereo Master mode)
tPD
PDN
VIL
Figure 12. Power Down Timing
VIH
SDA
VIL
tLOW
tBUF
tR
tHIGH
tF
tSP
VIH
SCL
VIL
tHD:STA
Stop
tHD:DAT
tSU:DAT
Start
tSU:STA
tSU:STO
Start
Stop
Figure 13. I2C Bus Timing
MS1242-E-02
2014/03
- 19 -
[AK4128A]
OPERATION OVERVIEW
■ Synchronous and Asynchronous Modes Setting
There are two modes of operation: asynchronous and synchronous modes. The AK4128A is set to Synchronous mode when
the INAS pin is “L” and it is set to Asynchronous mode when the INAS pin is “H”.
INAS pin
Mode
Data
LRCK
BICK
SDTI1
SDTI2
Synchro
ILRCK1
IBICK1
L
nous
(Note 21)
(Note 22)
SDTI3
SDTI4
SDTI1
ILRCK1
IBICK1
SDTI2
ILRCK2
IBICK 2
Asynchr
H
onous
SDTI3
ILRCK3
IBICK 3
SDTI4
ILRCK4
IBICK 4
Note 21. ILRCK2-4 pins must be connected to VSS2-5.
Note 22. IBICK2-4 pins must be connected to VSS2-5.
Table 1. Input Data Synchronous/Asynchronous Mode Setting
■ Audio Interface Format for Input PORT
The audio data format of input port is MSB first, 2’s complement format. The SDTI1, SDTI2, SDTI3 and SDTI4 are latched
on the rising edge of IBICK1, IBICK2, IBIXK3 and IBICK4 respectively.
In parallel control mode (SPB pin= “L”), IDIF2-0 pins control all audio interface formats of SRC1~4. IDIF2-0 pins must be
set during the PDN pin= “L”.
In serial control mode (SPB pin = “H”), setting of IDIF2-0 pins is ignored. IDIF[12:10] bits setting is reflected to SRC1,
IDIF[22:20] bits setting is reflected to SRC2, IDIF[32:30] bits setting is reflected to SRC3, and IDIF[42:40] bits setting is
reflected to SRC4.
IDIF[12:10] bits should be changed after all SDTO1 output codes become zero during soft mute by SMUTE1 bit = “1” or
the SMUTE pin = “H”. IDIF[22:20] bits should be changed after all SDTO2 output codes become zero during soft mute by
SMUTE2 bit = “1” or the SMUTE pin = “H”. IDIF[32:30] bits should be changed after all SDTO3 output codes become
zero during soft mute by SMUTE3 bit = “1” or the SMUTE pin = “H”. IDIF[42:40] bits should be changed after all SDTO4
output codes become zero during soft mute by SMUTE4 bit = “1” or the SMUTE pin = “H”.
TDM mode (Mode 5/6) can be set in Synchronous Inputs mode (INAS pin = “L”). Serial data for 8channels should be input
from the SDTI1 pin. In this mode, connect SDTI2-4 pins to VDD2-5 because there pins are ignored.
Asynchronous Inputs mode (INAS pin = “H”) does not support TDM mode. The AK4128A is not able to operate correctly
because of SDTI1-4 data inputs are incorrect. TDM mode is must be OFF, when using the AK4128A in asynchronous inputs
mode (INAS pin = “H”). The maximum input frequency of IBICK1-4 is 256FSI.
MS1242-E-02
2014/03
- 20 -
[AK4128A]
Mode
0
1
2
3
4
5
6
IDIF2
Pin
(Note 23)
L
L
L
IDIF1
Pin
(Note 23)
L
L
H
IDIF0
Pin
(Note 23)
L
H
L
SDTI1-4 Format
ILRCK
1-4
IBICK
1-4
IBICK1-4
Freq
16bit, LSB justified
32FSI
20bit, LSB justified
40FSI
24bit, MSB justified
48FSI
24 or 16bit, I2S Compatible
48FSI
Input
Input
L
H
H
16bit, I2S Compatible
32FSI
H
L
L
24bit, LSB justified
48FSI
H
L
H
TDM 24bit, MSB justified
256FSI
H
H
X
TDM 24bit, I2S Compatible
256FSI
Table 2. Input PORT Audio Interface Format (Parallel Control Mode, SPB pin= “L”) (X= Don’t care)
Note 23. In serial control mode (SPB pin = “H”), setting of IDIF2-0 pins is ignored. IDIF[12:10] bits setting is reflected to
SRC1, IDIF[22:20] bits setting is reflected to SRC2, IDIF[32:30] bits setting is reflected to SRC3, and IDIF[42:40]
bits setting is reflected to SRC4.
ILRCK
0 1 2 3
9 10 11 12 13 14 15 0 1 2 3
9 10 11 12 13 14 15 0 1
IBICK(32fs)
SDTI(i)
15 14 13
7 6 5 4 3 2 1 0 15 14 13
0 1 2 3
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
IBICK(64fs)
SDTI(i)
Don't Care
15 14 13 12
1 0
Don't Care
15 14 13 12
2 1 0
15:MSB, 0:LSB
Lch Data
Rch Data
Figure 14. Mode 0 Timing (16bit, LSB justified)
ILRCK
0 1 2
12 13
24
31 0 1 2
12 13
24
31 0 1
IBICK(64fs)
SDTI(i)
Don't Care
19
8
1 0
Don't Care
19
8
1 0
19:MSB, 0:LSB
Lch Data
Rch Data
Figure 15. Mode 1 Timing (20bit, LSB justified)
ILRCK
0 1 2
20 21 22 23 24
31 0 1 2
20 21 22 23 24
31 0 1
IBICK(64fs)
SDTI(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 16. Mode 2 Timing (24bit, MSB justified)
MS1242-E-02
2014/03
- 21 -
[AK4128A]
ILRCK
0 1 2 3
21 22 23 24 25
0 1 2
21 22 23 24 25
0 1
IBICK(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
2
Figure 17. Mode 3 Timing (24bit I S)
ILRCK
0 1 2
8 9
24
31 0 1 2
8 9
24
31 0 1
IBICK(64fs)
Don't Care
SDTI(i)
23
8
1 0
Don't Care
23
8
1 0
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 18. Mode 4 Timing (24bit, LSB justified)
Note: SDTI is identified as SDTI1, SDTI2, SDTI3 and SDTI4, ILRCK is identified as ILRCK1, ILRCK2, ILRCK3 and
ILRCK4, IBICK is identified as IBICK1, IBICK2, IBICK3 and IBICK4.
256 IBICK
ILRCK1(I)
IBICK1 (I: 256FSI)
SDTI1(I)
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
L1
R1
L2
R2
L3
R3
L4
R4
32 IBICK
32 IBICK
32 IBICK
32 IBICK
32 IBICK
32 I BICK
32 I BICK
32 I BICK
Figure 19. Mode 5 Timing (TDM, 24bit, MSB justified, SDTI2-4: Don’t care)
256 IBICK
ILRCK1(I)
IBICK1(I: 256FSI)
SDTI1(I)
23
0
23
0
23
0
23
0
23
0
23
0
23
0
23
0
L1
R1
L2
R2
L3
R3
L4
R4
32 IBICK
32 IBICK
32 IBICK
32 IBICK
32 IBICK
32 IBICK
32 IBICK
32 IBICK
23
Figure 20. Mode 6 Timing (TDM, I2S, SDTI2-4: Don’t care)
MS1242-E-02
2014/03
- 22 -
[AK4128A]
■ System Clock for Output PORT
The output ports work in master mode and slave mode. The CM2-0 pins select the master/slave mode.
OMCLK/XTI
FSO with
CM2 CM1 CM0
Mode
Master / Slave
MCKO Output
FSO
pin
pin
pin
Input
X’tal
0
L
L
L
Master
256FSO
256FSO
44.1~96kHz
8k108kHz
1
L
L
H
Master
384FSO
384FSO
29.4~64kHz
8k96kHz
2
L
H
L
Master
512FSO
512FSO
22.05~48kHz
8k54kHz
3
L
H
H
Master
768FSO
768FSO
14.7~32kHz
8k48kHz
OMCLK Input
4
H
L
L
Slave
Not used. (Note 24)
8k216kHz
Clock
5
H
L
H
Master
128FSO (Note 25)
128FSO
8k216kHz 88.2~192kHz
6
H
H
L
Slave(Bypass)
IMCLK Input
Not used. (Note 24)
8k216kHz
Clock
7
H
H
H
Master(Bypass)
Note 24. Use for a clock input or connect to VSS2-5 pin. In Mode 4, the MCKO pin outputs “L” if the OMCLK/XTI pin is
connected to VSS2-5. When a clock is input to the OMCLK/XTI pin, the clock is through and output from the
MCKO pin. In Mode 6-7, OMCLK/XTI input is ignored internally.
Note 25. Output ports do not support TDM mode in this mode.
Table 3. Output PORT Master/Slave/ Bypass Mode Control (SPB pin = “L”)
In serial control mode (SPB pin = “H”), the BYPS bit selects SRC bypass mode and SRC mode.
The default value of the BYPS bit is “0” (SRC mode).
Mode
CM2
pin
CM1
pin
CM0
pin
BYPS
bit
Master / Slave
0
1
2
3
L
L
L
L
L
L
H
H
L
H
L
H
0
0
0
0
Master
Master
Master
Master
OMCLK/XTI
Input
256FSO
384FSO
512FSO
768FSO
4
H
L
L
0
Slave
Not used. (Note 26)
MCKO
Output
256FSO
384FSO
512FSO
768FSO
OMCLK
Input
Clock
128FSO
8108kHz
896kHz
854kHz
8k~48kHz
FSO with
X’tal
44.1~96kHz
29.4~64kHz
22.05~48kHz
14.7~32kHz
8216kHz
-
FSO
5
H
L
H
0
Master
128FSO (Note 25)
8216kHz 88.2~192kHz
6
H
H
L
0
Slave (Bypass)
7
H
H
H
0
Master (Bypass)
8
L
L
L
1
Master (Bypass)
9
L
L
H
1
Master (Bypass)
IMCLK
10
L
H
L
1
Master (Bypass)
Not used. (Note 26)
Input
8216kHz
11
L
H
H
1
Master (Bypass)
Clock
12
H
L
L
1
Slave (Bypass)
13
H
L
H
1
Master (Bypass)
14
H
H
L
1
Slave (Bypass)
15
H
H
H
1
Master (Bypass)
Note 26. Use for a clock input or connect to VSS2-5 pin. In Mode 4, the MCKO pin outputs “L” if the OMCLK/XTI pin is
connected to VSS2-5. When a clock is input to the OMCLK/XTI pin, the clock is through and output from the
MCKO pin. In Mode 6-15, OMCLK/XTI input is ignored internally.
Table 4. Output PORT Master/Slave/ Bypass Mode Control (SPB pin = “H”)
MS1242-E-02
2014/03
- 23 -
[AK4128A]
(1) Master Mode
The OLRCK pin and OBICK pin are output pins in master mode. Master clock is supplied from the OMCLK/XTI pin. The
clock for the OMCLK/XTI pin can be generated by the following methods: Connect a crystal oscillator between the
OMCLK/XTI and XTO pins, or input a clock to the OMCLK/XTI pin. In bypass mode, the MCKO pin outputs IMCLK
data.
a.
X’tal
The OMCLK/XTI pin
is pulled down when
the PDN pin= “L”.
XTI
C
460k (typ)
C
XTO
AK4128A
Note: Refer to Table 5 for the capacitor and resistor values of the X’tal oscillator.
Figure 21. X’tal Mode
Nominal Frequency [MHz]
11.2896
12.288
24.576
Equivalent Series Resistance R1[Ω] max
60
External Capacitance C[pF] max
15
Table 5. Equivalent Series Resistor and External Capacitor for External X’tal Oscillator
In X’tal mode at 256FSO OMCLK input, FSO ranges from 44.1kHz to 96kHz.
In X’tal mode at 384FSO OMCLK input, FSO ranges from 29.4kHz to 64kHz.
In X’tal mode at 512FSO OMCLK input, FSO ranges from 22.05kHz to 48kHz.
In X’tal mode at 768FSO OMCLK input, FSO ranges from 14.7kHz to 32kHz.
In X’tal mode at 128FSO OMCLK input, FSO ranges from 88.2kHz to 192kHz.
b.
External Clcok
- Note: Do not input the clock over DVDD1-4.
XTI
External
Clock
460k (typ)
XTO
AK4128A
Figure 22. External Clock (OMCLK) mode
(2) Slave Mode
The OLRCK pin and OBICK pin are input pins in slave mode.
MS1242-E-02
2014/03
- 24 -
[AK4128A]
(3) SRC Bypass Mode
SRC bypass mode can be set in Synchronous inputs mode (INAS pin = “L”). Asynchronous inputs mode (INAS pin = “H”)
does not supports SRC bypass mode, so that the data is not transferred correctly on SDTI1→SDTO1, SDTI2→SDTO2,
SDTI3→SDTO3 and SDTI4→SDTO4 lines. In Asynchronous inputs mode (INAS pin = “H”), the AK4128A should be
used in SRC mode.
DITHER
SMT1
SMT0
SMSEMI
SMUTE
VSS2-5
DVDD1-4
INAS
DEM1
DEM0
IDIF2
IDIF1
IDIF0
When the AK4128A is in slave mode, SDTI1-4 data are input by the ILRCK1 and IBICK1 clocks in SRC bypass mode
(Table 2). The SDTI1-4 data are output from the OLRCK and OBICK pins in a format shown in Table 6 and Table 7. IBICK
and OBICK must be synchronized but the phase is not critical. ILRCK and OLRCK must be synchronized but the phase is
not critical.
OLRCK
OBICK
SRC1
Bypass
Input
Serial
Audio
I/F
IBICK1
ILRCK1
SDTI1
DEM
FIR
SRC
SMUTE
+
Dither
0.5 LSB
SRC
Input
Serial
Audio
I/F
DEM
FIR
SRC
SMUTE
SRC
Dither
+
DEM
FIR
SRC
SMUTE
SRC
+
DEM
FIR
SRC
SRC4
SMUTE
SRC
Dither
IMCLK
PDN
PM1
PM2
Internal
OSC
uP
I/F
CAD0
X’tal
Osc
SDA SCL XTO OMCLK/XTI
SPB
SDTO3
0.5 LSB
Bypass
Input
Serial
Audio
I/F
+
SDTO4
0.5 LSB
UNLOCK
Bypass
Clock
Div
CM2 CM1 CM0
SDTO2
SRC3
Dither
IBICK4
ILRCK4
SDTI4
ODIF1
ODIF0
Output
Serial
Audio
I/F
0.5 LSB
Bypass
Input
Serial
Audio
I/F
IBICK3
ILRCK3
SDTI3
OBIT1
OBIT2
SRC2
Bypass
IBICK2
ILRCK2
SDTI2
SDTO1
MCKO
SRC
Internal
Regulator
REF
AVDD
VSS1
VD18
Figure 23. Bypass Mode in Slave Mode (Synchronous mode INAS pin = “L”)
MS1242-E-02
2014/03
- 25 -
[AK4128A]
DITHER
SMT1
SMT0
SMSEMI
SMUTE
VSS2-5
DVDD1-4
INAS
DEM1
DEM0
IDIF2
IDIF1
IDIF0
When the AK4128A is in master mode, SDTI1-4 data are input by the ILRCK1 and IBICK1 clocks in SRC bypass mode
(Table 2). The SDTI1-4 output data are output by the ILRCK1 and IBICK1 clocks in a format shown in Table 6 and Table
7. The ILRCK1 clock bypasses the SRC and it is output from the OLRCK pin. The IBICK1 clock bypasses the SRC and it
is output from the OBICK pin.
OLRCK
OBICK
SRC1
Bypass
Input
Serial
Audio
I/F
IBICK1
ILRCK1
SDTI1
DEM
FIR
SRC
SMUTE
+
Dither
0.5 LSB
SRC
IBICK2
ILRCK2
SDTI2
DEM
FIR
SRC
SMUTE
SRC
Dither
+
DEM
FIR
SRC
SRC
+
DEM
FIR
SRC
SRC4
SMUTE
SRC
Dither
IMCLK
PDN
PM1
PM2
Internal
OSC
uP
I/F
CAD0
X’tal
Osc
SDA SCL XTO OMCLK/XTI
SPB
SDTO3
0.5 LSB
Bypass
Input
Serial
Audio
I/F
+
SDTO4
0.5 LSB
UNLOCK
Bypass
Clock
Div
CM2 CM1 CM0
SDTO2
SRC3
SMUTE
Dither
IBICK4
ILRCK4
SDTI4
ODIF1
ODIF0
Output
Serial
Audio
I/F
0.5 LSB
Bypass
Input
Serial
Audio
I/F
IBICK3
ILRCK3
SDTI3
OBIT1
OBIT2
SRC2
Bypass
Input
Serial
Audio
I/F
SDTO1
MCKO
SRC
Internal
Regulator
REF
AVDD
VSS1
VD18
Figure 24. Bypass Mode in Master Mode (Synchronous mode INAS pin = “L”)
MS1242-E-02
2014/03
- 26 -
[AK4128A]
■ Audio Interface Format for Output PORT
The ODIF1-0 pins and OBIT1-0 pins select the audio interface format for the output port. The audio data is MSB first, 2’s
complement format. The SDTO1-4 is clocked out on the falling edge of OBICK. Select the audio interface format for output
port when the PDN pin = “L”. If the AK4128A is in slave mode at bypass mode, IBICK1 and OBICK must be synchronized
but the phase is not critical. ILRCK1 and OLRCK must be synchronized but the phase is not critical. The audio interface
format of SDTO1, SDTO2, SDTO3 and SDTO4 are controlled together by ODIF1-0 pins, OBIT1-0 pins and TDM pin.
Output ports become TDM mode when the TDM pin = “H”. In TDM mode, the SDTI1 pin outputs serial data for 8channels
and the SDTI2-4 pins output “L”.
Mode
0
1
2
3
4
5
6
7
Mode
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
TDM
pin
TDM pin
L
L
L
L
H
H
H
H
Master / Slave
setting
ODIF1 pin ODIF0 pin
SDTO1-4 Format
L
L
LSB justified
L
H
Reserved
H
L
MSB justified
H
H
I2S Compatible
L
L
Reserved
L
H
Reserved
H
L
TDM256 mode 24bit MSB justified
H
H
TDM256 mode 24bit I2S Compatible
Table 6. Output PORT Audio Interface Format 1
OBIT1
pin
OBIT0
pin
SDTO
1-4
L
L
H
H
L
L
H
H
L
H
L
H
L
H
L
H
16bit
18bit
20bit
24bit
16bit
18bit
20bit
24bit
Slave
(CM2-0 = “HLL”
or “HHL”)
*
*
Master
(Not CM2-0 =
“HLL”/“HHL”)
*
*
Slave
(CM2-0 = “HLL”
or “HHL”)
L
Master
(Not CM2-0 =
“HLL”/“HHL”)
OBICK Frequency
MSB justified,
LSB
I2S
justified
32FSO
36FSO
64FSO
40FSO
48FSO
OLRCK
OBICK
Input
Input
Output
Output
64FSO
TDM256
mode
24bit
Input
Input
256FSO
TDM256
mode
24bit
Output
Output
256FSO
H
Table 7. Output PORT Audio Interface Format 2
(* The data length for 1channel is 24bit fixed in TDM mode. The OBIT1-0 pin settings are ignored. Connect these pins to
VSS2-5.)
MS1242-E-02
2014/03
- 27 -
[AK4128A]
OLRCK
0 1
8 9 10 11 12 13 14 15 16 17
20 21 22 23
29 30 31 0 1
8 9 10 11 12 13 14 15 16 17
20 21 22 23
29 30 31 0 1 2
OBICK(64fs)
15 14
11 10 9 8
2 1 0
15 14
11 10 9 8
2 1 0
17 16 15 14
11 10 9 8
2 1 0
17 16 15 14
11 10 9 8
2 1 0
19 18 17 16 15 14
11 10 9 8
2 1 0
19 18 17 16 15 14
11 10 9 8
2 1 0
11 10 9 8
2 1 0
23 22 21 20 19 18 17 16 15 14
11 10 9 8
2 1 0
SDTO(O)
15:MSB, 0:LSB
SDTO(O)
17:MSB, 0:LSB
SDTO(O)
19:MSB, 0:LSB
SDTO(O)
23 22 21 20 19 18 17 16 15 14
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 25. Stereo Mode LSB justified Timing
OLRCK
0 1 2 3 4
13 14 15 16 17 18 19 20 21 22 23 24
31 0 1 2 3 4
13 14 15 16 17 18 19 20 21 22 23 24
31 0 1 2
OBICK(64fs)
SDTO(O)
15 14 13 12
2 1 0
15 14 13 12
2 1 0
15 14
17 16 15 14
4 3 2 1 0
17 16
19 18 17 16
6 5 4 3 2 1 0
19 18
23 22 21 20
10 9 8 7 6 5 4 3 2 1 0
23 22
15:MSB, 0:LSB
SDTO(O)
17 16 15 14
4 3 2 1 0
17:MSB, 0:LSB
SDTO(O)
19 18 17 16
6 5 4 3 2 1 0
19:MSB, 0:LSB
SDTO(O)
23 22 21 20
10 9 8 7 6 5 4 3 2 1 0
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 26. Stereo Mode MSB Justified Timing
OLRCK
0 1 2 3 4
14 15 16 17 18 19 20 21 22 23 24
0 1 2 3 4
14 15 16 17 18 19 20 21 22 23 24
31 0 1 2
OBICK(64fs)
SDTO(O)
15 14 13 12
2 1 0
15 14 13 12
2 1 0
15
17 16 15 14
4 3 2 1 0
17
19 18 17 16
6 5 4 3 2 1 0
19
23 22 21 20
10 9 8 7 6 5 4 3 2 1 0
23
15:MSB, 0:LSB
SDTO(O)
17 16 15 14
4 3 2 1 0
17:MSB, 0:LSB
SDTO(O)
19 18 17 16
6 5 4 3 2 1 0
19:MSB, 0:LSB
SDTO(O)
23 22 21 20
10 9 8 7 6 5 4 3 2 1 0
23:MSB, 0:LSB
Lch Data
Rch Data
2
Figure 27. Stereo Mode I S Compatible Timing
Note: SDTO is identified as SDTO1, SDTO2, SDTO3 and SDTO4.
MS1242-E-02
2014/03
- 28 -
[AK4128A]
256 OBICK
1/ 32FSO
OLRCK(O)
OBICK(O) (256FSO)
SDTO 1 (O)
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
L1
R1
L2
R2
L3
R3
32OBICK
32OBICK
32OBICK
32OBICK
32OBICK
32OBICK
Figure 28. TDM 256 mode 24bit MSB justified Timing at Master Mode. (SDTO2-4: “L” outputs)
256 OBICK
min. 1/ 256FSO
OLRCK(I)
OBICK(I) (256FSO)
SDTO 1 (O)
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
L1
R1
L2
R2
L3
R3
L4
R4
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
Figure 29. TDM 256 mode 24bit MSB justified Timing at Slave Mode. (SDTO2-4: “L” outputs)
256 OBICK
1/32FSO
OLRCK(O)
OBICK (O: 256FSO)
SDTO 1 (O)
23
0
23
0
23
L1
R1
32 OBICK
32 OBICK
0
23
0
23
0
23
0
23
L2
R2
L3
R3
32 OBICK
32 OBICK
32 OBICK
32 OBICK
2
Figure 30. TDM 256 mode 24bit I S Compatible Timing at Master Mode (SDTO2-4: “L” outputs)
256 OBICK
min. 1/ 256FSO
OLRCK(I)
OBICK ( I: 256FSO)
SDTO 1 (O)
23
0
23
0
23
0
23
0
23
0
23
0
23
0
23
0
23
L1
R1
L2
R2
L3
R3
L4
R4
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
32 OBICK
Figure 31. TDM 256 mode 24bit I2S Compatible Timing at Slave Mode (SDTO2-4: “L” outputs)
MS1242-E-02
2014/03
- 29 -
[AK4128A]
■ 6/4channel Mode
The AK4128A has 6-channel and 4-channel modes to reduce power supply current when not using all eight channels. When
the PM2 and PM1 pins are set to “L/L”, six channels (SDTI1 SDTO1, SDTI2 SDTO2 and SDTI3 SDTO3) are
powered-up and the other two channels (SDTI4 SDTO4) are powered-down (“L” output). When the PM2 and PM1 pins
are set to “L/H”, four channels (SDTI1 SDTO1 and SDTI2 SDTO2) are powered-up and the other four channels
(SDTI3 SDTO3 and SDTI4 SDTO4) are powered-down (“L” output). In 6-channel and 4-channel modes, the X’tal
oscillator circuit and the MCKO output are powered-down and the XTO pin and MCKO pin output Hi-z.
PM2
pin
L
L
L
L
H
H
H
H
PM1
pin
L
L
H
H
L
L
H
H
PDN
pin
L
H
L
H
L
H
L
H
Mode
6-channel
mode
4-channel
mode
8-channel
mode
Not
available
X’tal Oscillator
XTI pin
XTO pin
MCKO pin
Pull down to VSS2-5 (note)
Hi-z
Input
Hi-z
Pull down to VSS2-5 (note)
Power-down
Hi-z
Input
Power-down
Pull down to VSS2-5 (note)
Hi-z
L
Normal operation
Input
Output
Normal operation
Note: Pull down (460kΩ typ.) to VSS2-5.
Table 8. Channel Mode Setting
Power-down
■ Soft Mute Operation
1. Manual Mode
The soft mute operation is performed in the digital domain of the SRC output. SRC1-4 soft mutes are controlled together by
the SMUTE pin in parallel control mode (SPB pin = “L”). In serial control mode (SPB pin = “H”), setting of the SMUTE pin
is ignored. SRC1 reflects SMUTE1 bit setting, SRC2 reflects SMUTE2 bit setting, SRC3 reflects SMUTE3 bit setting, and
SRC4 reflects SMUTE4 bit setting.
When the SMUTE pin goes “H” or SMUTE1-4 bits becomes “1”, all the outputs data are attenuated by during 1024
OLRCK cycles (@ SMT1 pin = “L” and SMT0 pin = “L”). When the SMUTE pin goes “L” or SMUTE1-4 bits becomes
“0”the mute is cancelled and the output attenuation gradually changes to 0dB during 1024 OLRCK cycles (@ SMT1 pin =
“L” and SMT0 pin = “L”). If the soft mute is cancelled before attenuating to -∞, the attenuation is discontinued and returned
to 0dB by the same cycles. The soft mute is effective for changing the signal source without stopping the signal transmission.
Soft mute cycle is set by SMT1-0 pins. SMT1-0 pins must not be changed during soft mute transition.
SMT1pin
L
L
H
H
SMT0 pin
Period
FSO=48kHz FSO=96kHz
L
1024/fso
21.3ms
10.7ms
H
2048/fso
42.7ms
21.3ms
L
4096/fso
85.3ms
42.7ms
H
8192/fso
170.7ms
85.3ms
Table 9. Soft Mute Cycle Setting (Parallel Mode)
MS1242-E-02
FSO=192kHz
5.3ms
10.7ms
21.3ms
42.7ms
2014/03
- 30 -
[AK4128A]
SMUTE pin,
SMUTE1-4 bit
(1)
0dB
(1)
(2)
Attenuation
-
All “0” code
SDTO
Note: SDTO is identified as SDTO1, SDTO2, SDTO3 and SDTO4.
(1) The soft mute cycle is selected by SMT1-0 pins. (Table 9) The output data is attenuated by during the soft mute
cycle.
(2) If the soft mute is cancelled before attenuating to , the attenuation is discontinued and returned to 0dB by the same
clock cycles.
Figure 32. Soft Mute Function (Manual Mode) 2. Semi-Auto Mode
When power down of the AK4128A is released (PDN pin = “L” “H”) with the SMSEMI pin= “H”, the AK4128A enters
semi-auto mode. In this mode, soft mute is cancelled automatically 4410/FSO after a rising edge of PDN (100ms
@FSO=44.1kHz). The soft mute is ON after releasing power down if the SMUTE pin = “H”. The SMSEMI pin must be set
during the PDN pin = “L”.
PDN pin
“L”
Don’t care
SMUTE pin
(1)
0dB
Attenuation
“L”
(2)
4410/fso
-
SDTO
All “0” code
Note: SDTO is identified as SDTO1, SDTO2, SDTO3 and SDTO4.
(1) The output data is attenuated by during the soft mute cycle (Table 9)
(2) When it is 0dB by a soft mute release after 4410/FSO, it is able to mute or release the mute by the soft mute cycle in
Table 9.
Figure 33. Soft Mute Function (Semi-Auto Mode)
MS1242-E-02
2014/03
- 31 -
[AK4128A]
■ Dither
The AK4128A includes a dither circuit. The dither circuit adds a dither signal after the lowest bit of all the output data set by
the OBIT1-0 pins when the DITHER pin = “H”, regardless of SRC and SRC bypass modes. If the output bit is 24bit length
in SRC bypass mode, the output code does not change by the DITHER pin setting.
■ De-emphasis Filter
The AK4128A includes a digital de-emphasis filter (tc = 50/15s) by an IIR filter. This filter corresponds to three
frequencies (32kHz, 44.1kHz and 48kHz). In parallel control mode (SPB pin = “L”), de-emphasis setting of SRC1-4 are
controlled together by DEM1-0 pins. In serial control mode (PSB pin = “H”), the setting of DEM1-0 pins is ignored. SRC1
reflects the DEM[11:10] bits setting, SRC2 reflects the DEM[21:20] bits setting, SRC3 reflects the DEM[31:30] bits
setting, and SRC4 reflects the DEM[41:40] bits setting.
DEM11pin
DEM10 pin Mode(SDTI1-4)
L
L
44.1kHz
L
H
OFF
H
L
48kHz
H
H
32kHz
Table 10. De-emphasis Filter Setting (Parallel Control Mode (SPB pin= “L”))
DEM11bit
DEM10 bit
Mode(SDTI1)
L
L
44.1kHz
L
H
OFF
H
L
48kHz
H
H
32kHz
Table 11. De-emphasis Filter Setting for SDTI1 (Serial Control Mode (SPB pin = “H”))
DEM21 bit
DEM20 bit
Mode(SDTI2)
L
L
44.1kHz
L
H
OFF
H
L
48kHz
H
H
32kHz
Table 12. De-emphasis Filter Setting for SDTI2 (Serial Control Mode (SPB pin= “H”))
DEM31 bit
DEM30 bit
Mode(SDTI3)
L
L
44.1kHz
L
H
OFF
H
L
48kHz
H
H
32kHz
Table 13. De-emphasis Filter Setting for SDTI3 (Serial Control Mode (SPB pin = “H”))
DEM41 bit
DEM40 bit
Mode(SDTI4)
L
L
44.1kHz
L
H
OFF
H
L
48kHz
H
H
32kHz
Table 14. De-emphasis Filter Setting for SDTI4 (Serial Control Mode (SPB pin = “H”))
MS1242-E-02
2014/03
- 32 -
[AK4128A]
■ Regulator
The AK4128A has an internal regulator which suppresses the voltage to 1.8V from DVDD1-4 voltage. The generated 1.8V
power is used as power supply for internal circuit. When over-current is flowed to the regulator output, over-current
detection circuit works. When over-voltage is flowed to the regulator output, over-voltage detection circuit works. The
regulator block is powered-down and the AK4128A becomes reset state when over-current detection circuit or over-voltage
detection circuit is operated. The AK4128A does not return to normal operation without a reset by the PDN pin when these
detection circuits are worked. When over-current or over-voltage is detected, the PDN pin should be brought into “L” at
once, and should be set to “H” again to recover normal operation.
The UNLOCK pin indicate the internal status of the device, and outputs “L” in SRC normal operation, and outputs “H”
when over-current or over-voltage are detected.
■ System Reset
Bringing the PDN pin = “L” sets the AK4128A power-down mode and initializes the digital filters. The AK4128A should be
reset once by bringing the PDN pin = “L” upon power-up. When PDN pin = “L”, the SDTO1-4 output is “L”. It takes 23ms
(max) for SDTO output enable after power-down state is released by a clock input. Until then, the SDTO1-4 outputs “L”.
The internal SRC circuit is powered-up on an edge of ILRCK1-4 after a power-up time period of the internal regulator.
(SDTO is identified as SDTO1, SDTO2, TDTO3 and SDTO4. SDTI is identified as SDTI1, SDTI2, SDTI3 and SDTI4.)
Case 1: System Reset with clock inputs
External clocks
(Input port)
Don’t care
Input Clocks 1
Input Clocks 2
Don’t care
SDTI
Don’t care
Input Data 1
Input Data 2
Don’t care
External clocks
(Output port)
Don’t care
Output Clocks 1
Output Clocks 2
Don’t care
PDN
23ms(max)
(Internal state) Power-down
SDTO4
“0” data
SDTO3
“0” data
SDTO2
“0” data
SDTO1
“0” data
(1)
23ms(max)
Normal
operation
PD
(1)
Normal
operation
Power-down
“0” data
Normal data
“0” data
“0” data
Normal data
“0” data
Normal data
“0” data
Normal data
“0” data
Normal data
“0” data
Normal data
Normal data
Normal data
“0” data
UNLOCK
Figure 34. System Reset 1
MS1242-E-02
2014/03
- 33 -
[AK4128A]
Case 2: System Reset without clock inputs
External clocks
(Input port)
(No Clock)
SDTI
External clocks
(Output port)
Input Clocks
Don’t care
(Don’t care)
Input Data
Don’t care
(Don’t care)
Output Clocks
Don’t care
PDN
21ms(max)
(Internal state) Power-down
Internal Circuit
Power-up Time
ILRCK1-4
Input wait
(2)
Normal
operation
Power-down
Normal data
“0” data
SDTO4
“0” data
SDTO3
“0” data
Normal data
“0” data
SDTO2
“0” data
Normal data
“0” data
SDTO1
“0” data
Normal data
“0” data
UNLOCK
Figure 35. System Reset 2
Note 27. SPB, CM2-0, INAS, PM2-1, OBIT1-0, TDM, ODIF1-0, IDIF2-0 and CAD0 pin must be changed when the PDN
pin= “L”.
Note 28. The UNLOCK pin outputs “H” when the PDN pin= “L”. SRC data is output from SDTO1-4 pins, which
corresponds to the each sampling frequency ratio detected SRC, after a rising edge “↑” of PDN if the internal
regulator is in normal operation. In 8-channel mode, the UNLOCK pin outputs “L” when sampling frequency ratio
detection is completed at all SRC’s. The UNLOCK pin keeps outputting “H” if there is one SRC which does not
finished sampling frequency ratio detection.
Note 29. (1) is the total time of “Internal circuit power-up + FSO/FSI ratio detection + Clock detection + Internal circuit
group delay”.
Note 30. (2) is the total time of “FSO/FSI ratio detection + Clock detection + Internal circuit group delay”.
MS1242-E-02
2014/03
- 34 -
[AK4128A]
■ Internal Reset Function for Clock Change
Clock change timing is shown in Figure 36 and Figure 37. SDTO is identified as SDTO1, SDTO2, SDTO3 and SDTO4.
When changing the clock, the AK4128A should be reset by the PDN pin in parallel control mode and it should be reset by
the PDN pin or RSTN bit in serial control mode (Figure 36). SDTO means SDTO1-4 in this figure.
External clocks
(Input port
or Output port)
Clocks 1
Clocks 2
Don’t care
PDN pin
max 23ms
(Internal state) Normal operation Power-down
SDTO
Att.Level
Normal operation
Note 31
Normal data
SMUTE (Note32,
recommended)
(3)
Normal data
1024/FSO
1024/FSO
0dB
-dB
Note 31. The data on SDTO may cause a clicking noise. To prevent this, set “0” to the SDTI more than 1024/fs (GD) before
the PDN pin changes to “L”. It makes the data on SDTO remain as “0”.
Note 32. SMUTE can also remove the clicking noise (Note 31).
Note 33. (3) is the total time of “Internal circuit power-up + FSO/FSI ratio detection + Internal circuit group delay”.
Figure 36. Clock Change Sequence in Parallel Control Mode (SPB pin = “L”)
External clocks
(Input port or Output port)
Clocks 1
Don’t care
Clocks 2
RSTN bit
pin
(Internal state)
Normal operation
SDTO
Normal data
Reset (Note 28)
Note 34
(4)
Normal operation
Normal data
1024/FSO
SMUTE (Note35,recommended)
1024/FSO
Att.Level
0dB
-dB
Note 34. The data on SDTO may cause a clicking noise. To prevent this, set “0” to the SDTI from GD before the PDN pin
changes to “L”. It makes the data on SDTO remain as “0”.
Note 35. SMUTE can also remove the unknown data at Note 26
Note 36. The digital block except serial control interface and registers is powered-down. The internal oscillator and
regulator are not powered-down.
Note 37. (4) is the total time of “0.5/FSI+8/FSI(O)+156/FSO” or “1.5/FSI+8/FSI(O)+156/FSO”. (FSI(O) is lower
frequency between FSI and FSO).
Figure 37. Clock Change Sequence in Serial Control Mode (SPB pin = “H”)
MS1242-E-02
2014/03
- 35 -
[AK4128A]
1. When the frequency of ILRCKx (x=1, 2, 3, 4) at input port is changed without a reset by the PDN pin or RSTN bit.
When the difference of internal oscillator (min. 59.4 MHz, typ. 73.5 MHz) clock number in one ILRCKx cycle
between before an ILRCKx frequency change (FSO/FSI ratio is stabilized) and after the change is more than ±100
for 8cycles, an internal reset is made automatically and sampling frequency ratio detection is executed again. SDTOx
outputs “L” when the internal reset is made, and SRC data is output after “0.5/FSI+8/FSI(O)+156/FSO or
1.5/FSI+8/FSI(O)+156/FSO” (FSI(O) is lower frequency between FSI and FSO).
If the difference of internal oscillator clock number in one ILRCKx cycle between before an ILRCKx frequency
change and after the change is less than ±100 or more than ±100 but shorter than 8cycles, the internal reset is not
executed. In both cases; when ILRCKx frequency is changed immediately without transition time or with transition
time which is not long enough for an internal reset, it takes 5148/FSO (max. 643.5ms @FSO=8kHz) (Note 38)to
output normal SRC data. Distorted data may be output until normal SRC output.
When ILRCKx is stopped, an internal reset is executed automatically. It takes “0.5/FSI+8/FSI(O)+156/FSO or
1.5/FSI+8/FSI(O)+156/FSO” (FSI(O) is lower frequency between FSI and FSO) [s] to output normal SRC data after
ILRCKx is input again.
2. When the frequency of OLRCK at output port is changed without a reset by the PDN pin or RSTN bit.
When the difference of internal oscillator clock number in one OLRCK cycle between before an OLRCK frequency
change (FSO/FSI ratio is stabilized) and after the change is more than ±100 for 8cycles, an internal reset is made
automatically and sampling frequency ratio detection is executed again. SDTOx (x=1, 2, 3, 4)outputs “L” when the
internal reset is made, and SRC data is output after “0.5/FSI+8/FSI(O)+156/FSO or 1.5/FSI+8/FSI(O)+156/FSO”
(FSI(O) is lower frequency between FSI and FSO).
If the difference of internal oscillator clock number in one OLRCK cycle between before an OLRCK frequency
change and after the change is less than ±100 or more than ±100 but shorter than 8cycles, the internal reset is not
executed. It takes 5148/FSO (max. 643.5ms @FSO=8kHz) (Note 38) to output normal SRC data. Distorted data may
be output until normal SRC output.
When OLRCK is stopped, an internal reset is executed automatically. It takes “0.5/FSI+8/FSI(O)+156/FSO or
1.5/FSI+8/FSI(O)+156/FSO” (FSI(O) is lower frequency between FSI and FSO) [s] to output normal SRC data
after ILRCKx is input again.
Note 38. When FSO=8kHz and FSO/FSI ratio is changed from 1/6 to 1/5.99. It is 160.9ms when FSO=32kHz and FSO/fSI
ratio is changed from 1/6 to 1/5.99.
MS1242-E-02
2014/03
- 36 -
[AK4128A]
■ Internal Status Pin
The UNLOCK pin indicates internal status of the device. This pin outputs “H” when the PDN pin = “L”. SRC data is output
from SDTO1-4 pins, which corresponds to the each sampling frequency ratio detected SRC, after a rising edge “↑” of PDN
if the internal regulator is in normal operation. In 8-channel mode, the UNLOCK pin outputs “L” when sampling frequency
ratio detection is completed at all SRC’s (SRC1-4). The UNLOCK pin keeps outputting “H” if there is one SRC which does
not finished sampling frequency ratio detection.
In 6-channel mode, the UNLOCK pin outputs “L” when sampling frequency ratio detection is completed at SRC1-3. It keeps
outputting “H” if there is one SRC which does not finish sampling frequency ratio detection.
In 4-channel mode, the UNLOCK pin outputs “L” when sampling frequency ratio detection is completed at SRC1-2. It keeps
outputting “H” if there is one SRC which does not finish sampling frequency ratio detection.
When over-current/voltage is flowed at the internal regulator, the UNLCOK pin outputs “H”. An OR’ed result of the flags
between over-current/voltage detection at the internal regulator and SRC sampling frequency detection complete is output
from this pin.
Over-Current/Voltage Limit Flag
(“L” Normal, “H” Over-Current/Voltage detect)
SRC Sampling Frequency Ratio Complete Flag
UNLOCK pin
Figure 38. Internal Flags and UNLOCK pin Output
In parallel control mode, if the AK4128A is set in SRC bypass mode by CM2-0 pins during the PDN pin = “L” and
powered-up, the UNLOCK pin outputs “L” after the power-up time of the internal regulator (max. 1.4ms) from a rising edge
“↑” of the PDN pin. In serial control mode, if BYPS bit is set to “1”while RSTN bit = “0”, the UNLOCK pin immediately
outputs “L” after the register writing.
MS1242-E-02
2014/03
- 37 -
[AK4128A]
■ Serial Control Interface
The AK4128A supports fast-mode I2C-bus system (max: 400kHz). Pull-up resistors at SDA and SCL pins should be
connected to (DVDD1-4 + 0.3)V or less voltage.
1. Data transfer
All commands are preceded by a START condition. After the START condition, a slave address is sent. After the AK4128A
recognizes the START condition, the device interfaced to the bus waits of the slave address to be transmitted over the SDA
line. If the transmitted slave address matches an address for one of the devices, the designated slave device pulls the SDA
line to LOW (ACKNOWLEDGE). The data transfer is always terminated by a STOP condition generated by the master
device.
1-1. Data validity
The data on the SDA line must be stable during a HIGH period of the clock. The HIGH or LOW state of the data line can
only be changed when the clock signal on the SCL line is LOW except for the START and the STOP condition.
SCL
SDA
DATA LINE
STABLE :
DATA VALID
CHANGE
OF DATA
ALLOWED
Figure 39. Data Transfer
1-2. START and STOP condition
A HIGH to LOW transition on the SDA line while SCL is HIGH indicates a START condition. All sequences start from the
START condition.
A LOW to HIGH transition on the SDA line while SCL is HIGH defines a STOP condition. All sequences end by the STOP
condition.
S
SCL
SDA
START CONDITION
STOP CONDITION
Figure 40. START and STOP conditions
MS1242-E-02
2014/03
- 38 -
[AK4128A]
1-3. ACKNOWLEDGE
ACKNOWLEDGE is a software convention used to indicate successful data transfers. The transmitter will release the SDA
line (HIGH) after transmitting eight bits. The receiver must pull down the SDA line during the acknowledge clock pulse so
that that it remains stable “L” during “H” period of this clock pulse. The AK4128A generates an acknowledge after each
byte is received.
In read mode, the slave, the AK4128A transmits eight bits of data, release the SDA line and monitor the line for an
acknowledge. If an acknowledge is detected and no STOP condition is generated by the master, the slave will continue
transmitting data. If an acknowledge is not detected, the slave will terminate further data transmissions and await the STOP
condition.
Clock pulse
for acknowledge
SCL FROM
MASTER
1
8
9
DATA
OUTPUT BY
TRANSMITTER
not acknowledge
DATA
OUTPUT BY
RECEIVER
START
CONDITION
acknowledge
Figure 41. Acknowledge on the I2C-bus
1-4. FIRST BYTE
The first byte, which includes seven bits of slave address and one bit of R/W bit, is sent after a START condition. If the
transmitted slave address matches an address for one of the device, the receiver who has been addressed pulls down the SDA
line.
The first six bits of the slave address are fixed as “001001”. The next (seventh) bit is CAD0 (device address bits). It is “0”
when the CAD0 pin = “L”, and “1” when the CAD pin = “H”. This bit identifies the specific device on the bus. When the
slave address is input, the matched device generates an acknowledge and executes a command. The eighth bit (R/W bit) of
the first byte defines whether the master requests a write or read condition. A “1” indicates that the read operation is to be
executed. A “0” indicates that the write operation is to be executed.
0
0
1
0
0
1
CAD0
R/W
Figure 42. The First Byte
MS1242-E-02
2014/03
- 39 -
[AK4128A]
2. WRITE Operations
Set R/W bit = “0” for the WRITE operation of the AK4128A.
After receipt of a start condition and the first byte, the AK4128A generates an acknowledge, and awaits the second byte
(register address). The second byte consists of the address for control registers of AK4128A. The format is MSB first, and
first 6bits must be fixed to “0”.
0
0
0
0
0
0
A1
A0
(*: Don’t care)
Figure 43. The Second Byte
After receipt the second byte, the AK4128A generates an acknowledge, and awaits the third byte. Those data after the
second byte contain control data. The format is MSB first, 8bits.
D7
D6
D5
D4
D3
D2
D1
D0
Figure 44. Byte structure after the second byte
The AK4128A is capable of more than one byte write operation by one sequence.
After receipt of the third byte, the AK4128A generates an acknowledge, and awaits the next data again. The master can
transmit more than one word instead of terminating the write cycle after the first data word is transferred. After the receipt of
each data, the internal address counter is incremented by one, and the next data is taken into next address automatically. If
the address exceeds 03H prior to generating a stop condition, the address counter will “roll over” to 00H and the previous
data will be overwritten.
S
T
A
R
T
SDA
Slave
Address
Register
Address(n)
Data(n)
S
T
Data(n+x) O
P
Data(n+1)
S
P
A
C
K
A
C
K
A
C
K
A
C
K
Figure 45. WRITE Operation
MS1242-E-02
2014/03
- 40 -
[AK4128A]
3. READ Operations
Set R/W bit = “1” for the READ operation of the AK4128A.
After transmission of the data, the master can read next address’s data by generating an acknowledge instead of terminating
the write cycle after the receipt of the first data word. After the receipt of each data, the internal address counter is
incremented by one, and the next data is taken into next address automatically. If the address exceeds 03H prior to
generating a stop condition, the address counter will “roll over” to 00H and the previous data will be overwritten.
The AK4128A supports two basic read operations: CURRENT ADDRESS READ and RANDOM READ.
3-1. CURRENT ADDRESS READ
The AK4128A contains an internal address counter that maintains the address of the last word accessed, incremented by
one. Therefore, if the last access (either a read or write) was to address “n”, the next CURRENT READ operation would
access data from the address “n+1”.
After receipt of the slave address with R/W bit set to “1”, the AK4128A generates an acknowledge, transmits 1byte data
which address is set by the internal address counter and increments the internal address counter by 1. If the master does not
generate an acknowledge but generate the stop condition, the AK4128A discontinues transmission.
S
T
A
R
T
SDA
Slave
Address
Data(n)
Data(n+1)
S
Data(n+x) T
O
P
Data(n+2)
S
P
A
C
K
A
C
K
A
C
K
A
C
K
Figure 46. CURRENT ADDRESS READ
3-2. RANDOM READ
Random read operation allows the master to access any memory location at random. Prior to issuing the slave address with
the R/W bit set to “1”, the master must first perform a “dummy” write operation.
The master issues a start condition, slave address (R/W=“0”) and then the register address to read. After the register
address’s acknowledge, the master immediately reissues the start condition and the slave address with the R/W bit set to “1”.
Then the AK4128A generates an acknowledge, 1byte data and increments the internal address counter by one. If the master
does not generate an acknowledge but generate the stop condition, the AK4128A discontinues transmission.
S
T
A
R
T
SDA
Slave
Address
S
T
A
R
T
Word
Address(n)
S
Slave
Address
Data(n)
S
Data(n+x) T
O
P
Data(n+1)
S
A
C
K
P
A
C
K
A
C
K
A
C
K
A
C
K
Figure 47. RANDOM READ
MS1242-E-02
2014/03
- 41 -
[AK4128A]
■ Register Map
Addr
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
00H
Reset & Mute
SMUTE4 SMUTE3 SMUTE2 SMUTE1
0
BYPS
0
RSTN
01H
De-emphasis
DEM41 DEM40 DEM31 DEM30 DEM21 DEM20 DEM11
DEM10
02H Input Audio Data Format 1
0
IDIF22 IDIF21 IDIF20
0
IDIF12 IDIF11
IDIF10
03H Input Audio Data Format 2
0
IDIF42 IDIF41 IDIF40
0
IDIF32 IDIF31
IDIF30
Note 39. All register values are initialized by the PDN pin = “L”.
Note 40. Writing to the address 00H ~ 03H are inhabited. The addresses defined as 0 must contain “0” data. BYPS bit and
IDIF12-10, 22-20, 32-30, 42-40 bits should be written when RSTN bit = “0”.
Note 41. I2C access becomes valid after 1.4ms (max) from PDN pin “↑”.
■ Register Definitions
Addr
00H
Register Name
Reset & Mute
R/W
Default
D7
SMUTE4
R/W
0
D6
SMUTE3
R/W
0
D5
SMUTE2
R/W
0
D4
SMUTE1
R/W
0
D3
0
RD
0
D2
BYPS
R/W
0
D1
0
RD
0
D0
RSTN
R/W
1
RSTN: Digital Reset Control
0: Reset
1: Reset Release (default)
When this bit is set to “0”, some digital blocks of the AK4128A are powered-down. In this case SRC1-4
can not operate. Control register settings are not initialized because I²C serial control interface and control
register blocks are not powered-down. Control register writings are available. The internal oscillator for
the clocks, the regulator and the reference voltage generation circuit are not powered-down.
BYPS: Bypass Mode Control
0: SRC Mode (default)
1: SRC Bypass Mode
Refer to Table 3.
SMUTE1: SRC1 Soft Mute Control
0: Soft Mute Release (default)
1: Soft Mute
In serial control mode (SPB pin= “H”), the SMUTE pin setting is ignored. SRC1 reflects the SMUTE1 bit
setting.
SMUTE2: SRC2 Soft Mute Control
0: Soft Mute Release (default)
1: Soft Mute
In serial control mode (SPB pin= “H”), the SMUTE pin setting is ignored. SRC2 reflects the SMUTE2 bit
setting.
SMUTE3: SRC3 Soft Mute Control
0: Soft Mute Release (default)
1: Soft Mute
In serial control mode (SPB pin= “H”), the SMUTE pin setting is ignored. SRC3 reflects the SMUTE3 bit
setting.
MS1242-E-02
2014/03
- 42 -
[AK4128A]
SMUTE4: SRC4 Soft Mute Control
0: Soft Mute Release (default)
1: Soft Mute
In serial control mode (SPB pin= “H”), the SMUTE pin setting is ignored. SRC4 reflects the SMUTE4 bit
setting.
Addr
01H
Register Name
De-emphasis
R/W
Default
D7
DEM41
R/W
0
D6
DEM40
R/W
1
D5
DEM31
R/W
0
D4
DEM30
R/W
1
D3
DEM21
R/W
0
D2
DEM20
R/W
1
D1
DEM11
R/W
0
D0
DEM10
R/W
1
DEM11/10: SRC1 De-emphasis Control
Default: “01” De-emphasis=OFF
DEM21/20: SRC2 De-emphasis Control
Default: “01” De-emphasis=OFF
DEM31/30: SRC3 De-emphasis Control
Default: “01” De-emphasis=OFF
DEM41/40: SRC4 De-emphasis Control
Default: “01” De-emphasis=OFF
In serial control mode (SPB pin= “H”), the setting of DEM1-0 pins is ignored. The DEM[11:10] bits setting is
reflected to SRC1, the DEM[21:20] bits setting is reflected to SRC2, the DEM[31:30] bits setting is reflected to
SRC3, and the DEM[41:40] bits setting is reflected to SRC4.
Addr
Register Name
02H
Input Audio Data Format 1
D7
D6
D5
D4
D3
D2
D1
D0
0
IDIF22
IDIF21
IDIF20
0
IDIF12
IDIF11
IDIF10
R/W
RD
R/W
R/W
R/W
RD
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
D7
D6
D5
D4
D3
D2
D1
D0
Addr
Register Name
03H
Input Audio Data Format 2
0
IDIF42
IDIF41
IDIF40
0
IDIF32
IDIF31
IDIF30
R/W
RD
R/W
R/W
R/W
RD
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
IDIF12/11/10: SRC1 Audio Data Interface Mode Select for Input Ports
Default: “000” Mode 0 (Refer Table 2)
IDIF22/21/20: SRC2 Audio Data Interface Mode Select for Input Ports
Default: “000” Mode 0 (Refer Table 2)
IDIF32/31/30: SRC3 Audio Data Interface Mode Select for Input Ports
Default: “000” Mode 0 (Refer Table 2)
IDIF42/41/40: SRC4 Audio Data Interface Mode Select for Input Ports
Default: “000” Mode 0 (Refer Table 2)
In serial control mode (SPB pin = “H”), the setting of IDIF2-0 pins is ignored. The IDIF[12:10] bits setting is
reflected to SRC1, the IDIF[22:20] bits setting is reflected to SRC2, the IDIF[32:30] bits setting is reflected to
SRC3, and the IDIF[42:40] bits setting is reflected to SRC4.
MS1242-E-02
2014/03
- 43 -
[AK4128A]
SYSTEM DESIGN
Figure 48 and Figure 49 shows the system connection diagram. An evaluation board is available which demonstrates
application circuits, the optimum layout, power supply arrangements and measurement results.
Parallel Control Mode (SPB pin = “L”).
Synchronous Mode (INAS pin = “L”).
OMCLK/XTI Input = X’tal mode
Input PORT: Slave mode, IBICK1 lock mode (64FSI), 24 bit MSB justified
Output PORT: Slave mode, 24 bit MSB justified
Dither = OFF, DEM=OFF, PM2/1 pin= “H/L” (8ch mode)
C1= 0.1μF
C2=10μF
C3=1μF± 30%
3.3V
+
C2
C1
C
C
+
C2
C3
FSI
64FSI
VSS1
VD18
AVDD
SPB
SDA
SCL
55
54
53
52
51
50
49
MCKO
TST3
56
TST0
57
CAD0
58
DVDD4
59
TST1
60
VSS5
+
61
TST2
62
SMSEMI
63
ILRCK2
C1
64
1 IBICK2
XTO 48
2 IMCLK
XTI/OMCLK 47
FSO
3 ILRCK1
OLRCK 46
4 IBICK1
OBICK 45
5 DVDD1
DVDD3 44
64FSO
C1
DSP1
C1
6 VSS2
VSS4 43
7 SDTI4
DSP2
SDTO4 42
8 SDTI1
SDTO1 41
Top View
9 SDTI2
SDTO2 40
10 SDTI3
SDTO3 39
11 IDIF0
ODIF0 38
12 IDIF1
ODIF1 37
13 IDIF2
CM0 36
14 ILRCK3
CM1 35
UNLOCK
DVDD2
VSS3
SMUTE
DITHER
PDN
SMT0
SMT1
DEM0
DEM1
PM1
OBIT0
OBIT1
PM2
TDM 33
INAS
CM2 34
16 ILRCK4
IBICK4
15 IBICK3
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
C1
+
C2
uP
Notes:
- All digital input pins should be not left floating.
- VSS1 -5 must be connected to the same ground plane.
- DVDD1-4 pins must be connected to the same power supply.
- Connect a 1μF (± 30%; including temperature characteristics) capacitor between the VD18 pin and DVSS. When
this capacitor is polarized, the positive polarity pin should be connected to the VD18 pin.
- Refer to Table 5 for the equivalent series resistance R1 and capacitance C values of the X’tal oscillator.
Figure 48. Typical Connection Diagram (Parallel Control Mode)
MS1242-E-02
2014/03
- 44 -
[AK4128A]
Serial Control Mode (SPB pin = “H”).
Asynchronous Inputs Mode (INAS pin = “H”).
OMCLK/XTI Input= 256FSO, X’tal
Input PORT: Slave mode, IBICK1~4 lock mode (64FSI)
Input Audio Interface Format can be set by registers.
Output PORT: Master mode, 24 bit MSB justified.
Dither = OFF, De-emphasis filter can be set by registers. PM2/1 pin= “H/L” (8ch mode)
C1= 0.1μF
C2=10μF
C3=1μF± 30%
3.3V
+
C2
C1
C
+
C
C2
C3
FSI
DSP1
64FSI
57
56
55
TST3
VD18
AVDD
SPB
SDA
SCL
TST2
SMSEMI
54
53
52
51
50
TST0
58
49
MCKO
59
CAD0
60
DVDD4
61
TST1
62
VSS1
ILRCK2
DSP2
63
VSS5
C1
+
64
1 IBICK2
XTO 48
2 IMCLK
XTI/OMCLK 47
FSO
3 ILRCK1
OLRCK 46
4 IBICK1
OBICK 45
5 DVDD1
DVDD3 44
64FSO
C1
C1
6 VSS2
VSS4 43
DSP5
7 SDTI4
SDTO4 42
8 SDTI1
SDTO1 41
Top View
9 SDTI2
SDTO2 40
10 SDTI3
SDTO3 39
11 IDIF0
ODIF0 38
12 IDIF1
ODIF1 37
13 IDIF2
CM0 36
14 ILRCK3
CM1 35
DSP3
15 IBICK3
CM2 34
16 ILRCK4
TDM 33
IBICK4
INAS
UNLOCK
DVDD2
VSS3
SMUTE
DITHER
PDN
SMT0
SMT1
DEM0
DEM1
PM1
OBIT0
OBIT1
PM2
DSP4
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
C1
+
C2
uP
Notes:
- All digital input pins should be not left floating.
- VSS1 -5 must be connected to the same ground plane.
- DVDD1-4 pins must be connected to the same power supply.
- Connect a 1μF (± 30%; including temperature characteristics) capacitor between the VD18 pin and DVSS. When
this capacitor is polarized, the positive polarity pin should be connected to the VD18 pin.
- Refer to Table 5 for the equivalent series resistance R1 and capacitance C values of the X’tal oscillator.
Figure 49. Typical Connection Diagram (Serial Control Mode)
MS1242-E-02
2014/03
- 45 -
[AK4128A]
1. Grounding and Power Supply Decoupling
The AK4128A requires careful attention to power supply and grounding arrangements. Alternatively if AVDD and
DVDD1-4 are supplied separately, the power up sequence is not critical. VSS1-5 must be connected to the same
ground plane. Decoupling capacitors should be as near to the AK4128A as possible, with the small value ceramic
capacitor being the nearest.
2. Jitter Tolerance
Figure 50 shows the jitter tolerance to ILRCK1-4 and IBICK. The jitter quantity is defined by the jitter frequency and the
jitter amplitude shown in Figure 50. When the jitter amplitude is 0.02Uipp or less, the AK4128A operates normally
regardless of the jitter frequency.
A
Figure 50. Jitter Tolerance
(1) Normal Operation
(2) There is a possibility that the output data is lost.
Note
▪ Y axis is the jitter amplitude of ILRCK1-4 just before THD+N degradation starts.
1UI (Unit Interval) is one cycle of IBICK. When FSI = 48kHz, 1[UIpp]=1/48kHz=20.8μs
MS1242-E-02
2014/03
- 46 -
[AK4128A]
3. Digital Filter Response Example
Table 15 shows the examples of digital filter response performed by the AK4128A.
Ratio
FSO/FSI [kHz]
4.000
1.000
0.919
0.725
0.667
0.544
0.500
0.500
0.459
0.363
0.333
0.250
0.250
0.230
0.167
0.181
0.167
0.181
192/48.0
48.0/48.0
44.1/48.0
32.0/44.1
32.0/48.0
48.0/88.2
48.0/96.0
44.1/88.2
44.1/96.0
32.0/88.2
32.0/96.0
48.0/192.0
44.1/176.4
44.1/192.0
32.0/192.0
32.0/176.4
8/48.0
8/44.1
Stopband
Attenuation [dB]
22.000
26.000
121.2
22.000
26.000
121.2
20.000
24.100
121.4
14.088
17.487
115.3
13.688
17.488
116.9
19.250
26.232
114.6
20.900
27.000
100.2
19.202
24.806
100.2
18.700
25.000
103.3
12.863
18.665
102.0
12.500
18.900
103.6
17.600
30.200
104.0
16.170
27.746
104.0
15.860
28.240
103.3
11.200
19.600
73.2
10.278
17.987
73.2
2.800
4.900
73.2
2.5695
4.4968
73.2
Table 15. Digital Filter Example
Passband [kHz]
Stopband [kHz]
Gain [dB]
0.01@ 20k
0.01@ 20k
0.01@ 20k
0.01@ 14.5k
0.19@ 14.5k
0.03@ 20k
0.01@ 20k
0.08@ 20k
0.23@ 20k
0.75@ 14.5k
1.07@ 14.5k
0.18@ 20k
1.34@ 20k
1.40@ 20k
2.97@ 14.5k
7.88@ 14.5k
2.97@ 3.625k
7.88@ 3.625k
2
4. I C bus Connection
SCL and SDA pins should be connected to DVDD1-4 through the resistor based on I2C standard. As there is a protection
between each pin and DVDD1-4, the pulled up voltage must be DVDD1-4 or lower (Figure 51).
+3.3V
DVDD1-4
AK4128A
SDA pin
VSS2-5
Figure 51. SDA pin output
MS1242-E-02
2014/03
- 47 -
[AK4128A]
PACKAGE
64pin LQFP(Unit: mm)
12.00.3
Max 1.85
10.0
1.40
0.00~0.25
33
32
48
12.00.3
49
64
17
16
1
0.5
0.20.1
0.10~0.25
0.10 M
0~10
0.50.2
0.10
■ Material & Lead finish
Package molding compound:
Lead frame material:
Lead frame surface treatment:
Epoxy, Halogen (bromine and chlorine) free
Cu
Solder (Pb free) plate
MS1242-E-02
2014/03
- 48 -
[AK4128A]
MARKING (AK4128AEQ)
AKM
AK4128AEQ
XXXXXXX
1
XXXXXXX: Date code identifier
MARKING (AK4128AVQ)
AKM
AK4128AVQ
XXXXXXX
1
XXXXXXX: Date code identifier
MS1242-E-02
2014/03
- 49 -
[AK4128A]
REVISION HISTORY
Date (Y/M/D)
10/09/13
11/06/02
Revision
00
01
14/03/06
02
Reason
First Edition
Description
Addition
Error
Correction
Page
Contents
4
■ Compatibility with AK4126
(2) Pins: No. 63-pin was added.
SWITCHING CHARACTERISTICS
Output PORT LRCK for TDM256 Mode (OLRCK)
“H”/“L” time (Master Mode): 1/8FSO → 1/32FSO
■ Synchronous and Asynchronous Modes Setting
Table 1: FSI pin → INAS pin
■ Audio Interface Format for Output PORT
Figure 28 and 30 were changed.
PACKAGE
Package dimensions were changed.
13
20
29
Description
Change
48
MS1242-E-02
2014/03
- 50 -
[AK4128A]
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the
information contained in this document without notice. When you consider any use or application of
AKM product stipulated in this document (“Product”), please make inquiries the sales office of AKM
or authorized distributors as to current status of the Products.
1. All information included in this document are provided only to illustrate the operation and application
examples of AKM Products. AKM neither makes warranties or representations with respect to the
accuracy or completeness of the information contained in this document nor grants any license to any
intellectual property rights or any other rights of AKM or any third party with respect to the
information in this document. You are fully responsible for use of such information contained in this
document in your product design or applications. AKM ASSUMES NO LIABILITY FOR ANY
LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM THE USE OF SUCH
INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require
extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which may
cause loss of human life, bodily injury, serious property damage or serious public impact, including
but not limited to, equipment used in nuclear facilities, equipment used in the aerospace industry,
medical equipment, equipment used for automobiles, trains, ships and other transportation, traffic
signaling equipment, equipment used to control combustions or explosions, safety devices, elevators
and escalators, devices related to electric power, and equipment used in finance-related fields. Do not
use Product for the above use unless specifically agreed by AKM in writing.
3. Though AKM works continually to improve the Product’s quality and reliability, you are responsible
for complying with safety standards and for providing adequate designs and safeguards for your
hardware, software and systems which minimize risk and avoid situations in which a malfunction or
failure of the Product could cause loss of human life, bodily injury or damage to property, including
data loss or corruption.
4. Do not use or otherwise make available the Product or related technology or any information
contained in this document for any military purposes, including without limitation, for the design,
development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or missile
technology products (mass destruction weapons). When exporting the Products or related technology
or any information contained in this document, you should comply with the applicable export control
laws and regulations and follow the procedures required by such laws and regulations. The Products
and related technology may not be used for or incorporated into any products or systems whose
manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations.
5. Please contact AKM sales representative for details as to environmental matters such as the RoHS
compatibility of the Product. Please use the Product in compliance with all applicable laws and
regulations that regulate the inclusion or use of controlled substances, including without limitation,
the EU RoHS Directive. AKM assumes no liability for damages or losses occurring as a result of
noncompliance with applicable laws and regulations.
6. Resale of the Product with provisions different from the statement and/or technical features set forth
in this document shall immediately void any warranty granted by AKM for the Product and shall not
create or extend in any manner whatsoever, any liability of AKM.
7. This document may not be reproduced or duplicated, in any form, in whole or in part, without prior
written consent of AKM.
MS1242-E-02
2014/03
- 51 -
