AKM AKD4556

ASAHI KASEI
[AK4556]
AK4556
3V 192kHz 24Bit ∆Σ CODEC
GENERAL DESCRIPTION
The AK4556 is a low voltage 24bit 192kHz CODEC for high performance battery powered digital audio
subsystems. The dynamic performance to power supply voltage ratio is very high, attaining 103dB and
106dB SNR for ADC and DAC, respectively. Sampling rates up to 216kHz are supported. The AK4556
reduces jitter sensitivity by using an integrated switched-capacitor filter. The analog inputs and outputs
are single-ended to minimize pin count and external filtering requirements. Packaged in a very small
20-pin TSSOP, the AK4556 is ideal for space-sensitive applications.
FEATURES
† Single-ended ADC
- Dynamic Range, S/N: 103dB@VA=3.0V
- S/(N+D): 91dB@VA=3.0V
- HPF for DC-offset cancel (fc = 1Hz @ fs=48kHz)
- HPF can be disabled
† Single-ended DAC
- Dynamic Range, S/N: 106dB@VA=3.0V
- S/(N+D): 90dB@VA=3.0V
- Digital de-emphasis for 32kHz, 44.1kHz and 48kHz sampling
† Audio I/F format: MSB First, 2’s Complement
- ADC: 24bit MSB justified or I2S compatible
- DAC: 24bit MSB justified, 24bit LSB justified or I2S compatible
† Input/Output Voltage: ADC = 2.1Vpp @ VA=3.0V
DAC = 2.1Vpp @ VA=3.0V
† Master/Slave mode
† Sampling Rate:
- Normal Speed: 8kHz to 54kHz
(256fs or 512fs)
8kHz to 48kHz
(384fs or 768fs)
- Double Speed: 54kHz to 108kHz
(256fs)
48kHz to 96kHz
(384fs)
- Quad Speed: 108kHz to 216kHz (128fs)
96kHz to 192kHz (192fs)
† Master Clock:
- Slave mode: 256fs, 384fs, 512fs or 768fs (Normal Speed)
256fs or 384fs
(Double Speed)
128fs or 192fs
(Quad Speed)
- Master mode: 256fs or 512fs
(Normal Speed)
256fs
(Double Speed)
128fs
(Quad Speed)
† Power Supply: 2.4 to 3.6V (Normal Speed, Double Speed)
2.7 to 3.6V (Quad Speed)
† Power Supply Current: 27.5mA
† Ta = -40 to 85°C
† Very Small Package: 20pin TSSOP
† Upper compatible with AK4552
MS0559-E-00
2006/11
-1-
ASAHI KASEI
[AK4556]
VA
LIN
RIN
VCOM
VSS
VD
PDN
∆Σ
Modulator
Decimation
Filter
∆Σ
Modulator
Decimation
Filter
Clock
Divider
MCLK
LRCK
BCLK
Serial I/O
Interface
Common Voltage
SDTO
SDTI
CKS3
LOUT
ROUT
LPF
∆Σ
Modulator
LPF
∆Σ
Modulator
8X
Interpolator
CKS2
CKS1
CKS0
8X
DEM0
Interpolator
DEM1
Figure 1. Block Diagram
„ Compatibility with the AK4552
1. Function
Function
fs (max)
HFP Cut-off
HPF Disable
ADC
Input Level
Input Resistance
Init Cycle
S/(N+D)
DR, S/N
DF
SA
SB
GD
DAC
Output Level
Road Resistance
S/(N+D)
DR, S/N
DF
SA
GD
MCLK (Slave)
Monitor Mode
M/S mode
Audio I/F
ADC
DAC
Idd (Vdd = 3V)
VDD
Package
AK4552
100kHz
3.7Hz @ fs = 48kHz
No
AK4556
216kHz
1Hz @ fs = 48kHz
Yes
0.617 x VA
34kΩ @ fs = 44.1kHz, 24kΩ @ fs = 96kHz
2081/fs
89dB
97dB
65dB
29.4kHz
17/fs
0.7 x VA
8kΩ@ fs = 48kHz, 96kHz, 192kHz
4134/fs @ Normal Speed, Slave mode
91dB
103dB
68dB
28kHz
18/fs
0.583 x VA
10kΩ
88dB
100dB
43dB
15.4/fs
256/384/512/768fs @ Normal Speed mode
256/384fs @ Double Speed Mode
128/192fs @ Double Speed Monitor
64/96/128/192fs @ Quad Speed Monitor
Yes (Double / Quad)
Slave
24bit MSB justified
24bit LSB justified
14mA
2.4V to 4.0V
0.7 x VA
5kΩ
90dB
106dB
54dB
21/fs
256/384/512/768fs @ Normal Speed
16TSSOP
(5.0mm x 6.4mm, 0.65mm Pitch)
MS0559-E-00
256/384fs @ Double Speed
128/192fs @ Quad Speed
No
Master / Slave
24bit MSB justified / I2S
24bit MSB justified /24bit LSB justified / I2S
27.5mA
2.4V to 3.6V (Normal/Double Speed)
2.7V to 3.6V (Quad Speed)
20TSSOP
(6.5mm x 6.4mm, 0.65mm Pitch)
2006/11
-2-
ASAHI KASEI
[AK4556]
2. Pin Layout
RIN
1
20
ROUT
LIN
2
19
LOUT
VSS
3
18
VCOM
VA
4
17
PDN
VD
5
16
BCLK
DEM0
6
15
MCLK
DEM1
7
14
LRCK
SDTO
8
13
SDTI
CKS0
9
12
CKS3
CSK1
10
11
CSK2
AK4552
Top
View
MS0559-E-00
AK4556
2006/11
-3-
ASAHI KASEI
[AK4556]
„ Ordering Guide
AK4556VT
AKD4556
-40 ∼ +85°C
20pin TSSOP (0.65mm pitch)
Evaluation Board for AK4556
„ Pin Layout
RIN
1
20
ROUT
LIN
2
19
LOUT
VSS
3
18
VCOM
VA
4
17
PDN
VD
5
16
BCLK
DEM0
6
15
MCLK
DEM1
7
14
LRCK
SDTO
8
13
SDTI
CKS0
9
12
CKS3
CSK1
10
11
CSK2
Top
View
MS0559-E-00
2006/11
-4-
ASAHI KASEI
[AK4556]
PIN/FUNCTION
No.
Pin Name
I/O
1
2
3
4
5
6
7
RIN
LIN
VSS
VA
VD
DEM0
DEM1
I
I
I
I
8
SDTO
O
9
10
11
12
13
CKS0
CSK1
CSK2
CSK3
SDTI
I
I
I
I
I
Function
Rch Analog Input Pin
Lch Analog Input Pin
Ground Pin
Analog Power Supply Pin
Digital Power Supply Pin
De-emphasis Control Pin
De-emphasis Control Pin
Audio Serial Data Output Pin
When PDN pin is “L”, SDTO pin outputs “L”.
Mode Setting Pin #0
Mode Setting Pin #1
Mode Setting Pin #2
Mode Setting Pin #3
Audio Serial Data Input Pin
Input/Output Channel Clock Pin
14
LRCK
I/O
When PDN pin is “L”, LRCK pin outputs “L” in master mode.
15
MCLK
I
Master Clock Input Pin
Audio Serial Data Clock Pin
16
BCLK
I/O
When PDN pin is “L”, BCLK pin outputs “L” in master mode.
Power-Down & Reset Mode Pin
17
PDN
I
“L”: Power-down and Reset, “H”: Normal operation
The AK4556 should be reset once by bringing PDN pin = “L”.
18
VCOM
O
Common Voltage Output Pin, 0.5 x VA
Lch Analog Output Pin
19
LOUT
O
When PDN pin is “L”, LOUT pin becomes Hi-Z.
Rch Analog Output Pin
20
ROUT
O
When PDN pin is “L”, ROUT pin becomes Hi-Z.
Note: Do not allow digital input pins except analog input pins (LIN and RIN) to float.
„ Handling of Unused Pin
The unused I/O pin should be processed appropriately as below.
Classification
Analog Input
Analog Output
Pin Name
LIN, RIN
LOUT, ROUT
Setting
These pins should be open.
These pins should be open.
MS0559-E-00
2006/11
-5-
ASAHI KASEI
[AK4556]
ABSOLUTE MAXIMUM RATINGS
(VSS=0V; Note 1)
Parameter
Power Supplies
Analog
Digital
Input Current (Any Pin Except Supplies)
Analog Input Voltage (LIN, RIN pin)
Digital Input Voltage (Note 2)
Ambient Temperature (power applied)
Storage Temperature
Symbol
VA
VD
IIN
VINA
VIND
Ta
Tstg
min
-0.3
-0.3
-0.3
-0.3
-40
-65
max
4.6
4.6
±10
VA+0.3
VD+0.3
85
150
Units
V
V
mA
V
V
°C
°C
Note 1. All voltages with respect to ground.
Note 2. DEM1, DEM0, CKS3, CKS2, CKS1, CKS0, SDTI, LRCK, BCLK, MCLK and PDN pins
WARNING: Operation at or beyond these limits may results in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS (Normal/Double Speed)
(VSS=0V; Note 1)
Parameter
Symbol
min
typ
max
Power Supplies (Note 3)
Analog
VA
2.4
3.0
3.6
Digital
VD
2.4
3.0
3.6
Difference
VD - VA
0.3
Units
V
V
V
RECOMMENDED OPERATING CONDITIONS (Quad Speed)
(VSS=0V; Note 1)
Parameter
Power Supplies (Note 3)
Analog
Digital
Difference
Symbol
VA
VD
VD - VA
min
2.7
2.7
-
typ
3.0
3.0
-
max
3.6
3.6
0.3
Units
V
V
V
Note 1. All voltages with respect to ground.
Note 3. The power up sequence between VA and VD is not critical.
*AKM assumes no responsibility for the usage beyond the conditions in this data sheet.
MS0559-E-00
2006/11
-6-
ASAHI KASEI
[AK4556]
ANALOG CHARACTERISTICS
(Ta=25°C; VA=VD=3.0V; VSS=0V; fs=48kHz, 96kHz, 192kHz; Signal Frequency=1kHz; BCLK=64fs; Data=24bit
Measurement frequency=20Hz ∼ 20kHz at fs=48kHz, 40Hz ∼ 40kHz at fs=96kHz, 40Hz ∼ 40kHz at fs=192kHz; unless
otherwise specified)
Parameter
min
typ
max
Units
ADC Analog Input Characteristics:
Resolution
24
Bits
Input Voltage
(Note 4)
1.9
2.1
2.3
Vpp
S/(N+D)
fs=48kHz
−1dBFS
82
91
dB
BW=20kHz
−60dBFS
40
dB
fs=96kHz
−1dBFS
80
90
dB
BW=40kHz
−60dBFS
37
dB
fs=192kHz
−1dBFS
90
dB
BW=40kHz
−60dBFS
37
dB
DR
(−60dBFS with A-weighted)
95
103
dB
S/N
(A-weighted)
95
103
dB
Input Resistance
6
8
kΩ
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.1
0.5
dB
Gain Drift
100
ppm/°C
Power Supply Rejection
(Note 8)
50
dB
DAC Analog Output Characteristics:
Resolution
24
Bits
Output Voltage
(Note 5)
1.9
2.1
2.3
Vpp
S/(N+D)
fs=48kHz
0dBFS
80
90
dB
BW=20kHz
−60dBFS
43
dB
fs=96kHz
0dBFS
78
88
dB
BW=40kHz
−60dBFS
40
dB
fs=192kHz
0dBFS
88
dB
BW=40kHz
−60dBFS
40
dB
DR
(−60dBFS with A-weighted)
98
106
dB
S/N
(A-weighted)
98
106
dB
Load Capacitance
(Note 6)
30
pF
Load Resistance
(Note 7)
5
kΩ
Interchannel Isolation
90
110
dB
Interchannel Gain Mismatch
0.1
0.5
dB
Gain Drift
100
ppm/°C
Power Supply Rejection
(Note 8)
50
dB
Note 4. This value is the full scale (0dB) of the input voltage. Input voltage is proportional to VA voltage.
Vin = 0.7 x VA (Vpp).
Note 5. This value is the full scale (0dB) of the output voltage. Output voltage is proportional to VA voltage.
Vout = 0.7 x VA (Vpp).
Note 6. When LOUT/ROUT drives some capacitive load, a 220Ω resistor should be added in series between
LOUT/ROUT and capacitive load. In this case, LOUT/ROUT pins can drive a capacitor of 400pF.
Note 7. For AC-load
Note 8. PSR is applied to VA and VD with 1kHz, 50mVpp. VCOM pin is connected to a 2.2µF electrolytic capacitor and
a 0.1µF ceramic capacitor.
MS0559-E-00
2006/11
-7-
ASAHI KASEI
[AK4556]
Parameter
min
typ
max
Units
-
19.5
8
11
14
29
12
17
21
mA
mA
mA
mA
-
10
100
µA
Power Supplies
Power Supply Current
Normal Operation (PDN pin = “H”)
VA
VD
fs=48kHz
(Note 9)
fs=96kHz
fs=192kHz
Power down mode (PDN pin = “L”)
VA+VD
(Note 10)
Note 9. These values are in slave mode. In master mode, these values are 8.3mA (typ.) @ fs=48kHz, 11.6mA (typ.) @
fs=96kHz, 15.2mA (typ.) @ fs=192kHz.
Note 10. All digital input pins are held VD or VSS.
FILTER CHARACTERISTICS (fs=48kHz)
(Ta= -40 ∼ +85°C; VA, VD=2.4∼ 3.6V; DEM=OFF)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 11) ±0.1dB
PB
0
−0.2dB
20.0
−3.0dB
23.0
Stopband
(Note 11)
SB
28
Passband Ripple
PR
Stopband Attenuation
SA
68
Group Delay Distortion
∆GD
0
Group Delay
(Note 12)
GD
18
ADC Digital Filter (HPF):
Frequency Response (Note 11) −3dB
FR
1.0
−0.1dB
6.5
DAC Digital Filter (LPF):
Passband
(Note 11) ±0.06dB
PB
0
−6.0dB
24.0
Stopband
(Note 11)
SB
26.2
Passband Ripple
PR
Stopband Attenuation
SA
54
Group Delay Distortion
∆GD
0
Group Delay
(Note 12)
GD
21
DAC Digital Filter + Analog Filter:
Frequency Response (Note 13) 20kHz
FR
-0.1
MS0559-E-00
max
Units
18.9
±0.04
-
kHz
kHz
kHz
kHz
dB
dB
µs
1/fs
-
Hz
Hz
21.8
±0.02
-
kHz
kHz
kHz
dB
dB
µs
1/fs
-
dB
2006/11
-8-
ASAHI KASEI
[AK4556]
FILTER CHARACTERISTICS (fs=96kHz)
(Ta= -40 ∼ +85°C; VA, VD=2.4∼ 3.6V; DEM=OFF)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 11) ±0.1dB
PB
0
−0.2dB
40.0
−3.0dB
46.0
Stopband
(Note 11)
SB
56
Passband Ripple
PR
Stopband Attenuation
SA
68
Group Delay Distortion
∆GD
0
Group Delay
(Note 12)
GD
18
ADC Digital Filter (HPF):
Frequency Response (Note 11) −3dB
FR
2.0
−0.1dB
13.0
DAC Digital Filter (LPF):
Passband
(Note 11) ±0.06dB
PB
0
−6.0dB
48.0
Stopband
(Note 11)
SB
52.4
Passband Ripple
PR
Stopband Attenuation
SA
54
Group Delay Distortion
∆GD
0
Group Delay
(Note 12)
GD
21
DAC Digital Filter + Analog Filter:
Frequency Response (Note 13) 40kHz
FR
-0.3
FILTER CHARACTERISTICS (fs=192kHz)
(Ta= -40 ∼ +85°C; VA, VD=2.7∼ 3.6V; DEM=OFF)
Parameter
Symbol
min
typ
ADC Digital Filter (Decimation LPF):
Passband
(Note 11) ±0.1dB
PB
0
−0.2dB
57.0
−3.0dB
90.3
Stopband
(Note 11)
SB
112
Passband Ripple
PR
Stopband Attenuation
SA
70
Group Delay Distortion
∆GD
0
Group Delay
(Note 12)
GD
18
ADC Digital Filter (HPF):
Frequency Response (Note 11) −3dB
FR
4.0
−0.1dB
26.0
DAC Digital Filter (LPF):
Passband
(Note 11) ±0.5dB
PB
0
−6.0dB
96.0
Stopband
(Note 11)
SB
104.9
Passband Ripple
PR
Stopband Attenuation
SA
54
Group Delay Distortion
∆GD
0
Group Delay
(Note 12)
GD
21
DAC Digital Filter + Analog Filter:
Frequency Response (Note 13) 40kHz
FR
-0.3
MS0559-E-00
max
Units
37.8
±0.04
-
kHz
kHz
kHz
kHz
dB
dB
µs
1/fs
-
Hz
Hz
43.6
±0.02
-
kHz
kHz
kHz
dB
dB
µs
1/fs
-
dB
max
Units
56.6
±0.02
-
kHz
kHz
kHz
kHz
dB
dB
µs
1/fs
-
Hz
Hz
87.0
±0.02
-
kHz
kHz
kHz
dB
dB
µs
1/fs
-
dB
2006/11
-9-
ASAHI KASEI
[AK4556]
Note 11. The passband and stopband frequencies scales with fs (sampling frequency). For example, ADC: Passband
(±0.1dB) = 0.39375 x fs (@ fs=48kHz), DAC: Passband (±0.06dB) = 0.45412 x fs.
Note 12. The calculated delay time resulting from digital filtering. For the ADC, this time is from the input of an analog
signal to the setting of 24bit data for both channels to the ADC output register. For the DAC, this time is from
setting the 24 bit data both channels at the input register to the output of an analog signal.
Note 13. The reference frequency is 1kHz.
DC CHARACTERISTICS
(Ta=-40 ∼ +85°C; VA, VD=2.4 ∼ 3.6V)
Parameter
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage (Iout=-100µA)
Low-Level Output Voltage
(Iout=100µA)
Input Leakage Current
Symbol
VIH
VIL
VOH
VOL
Iin
MS0559-E-00
min
70%VD
VD-0.5
-
typ
-
max
30%VD
0.5
± 10
Units
V
V
V
V
µA
2006/11
- 10 -
ASAHI KASEI
[AK4556]
SWITCHING CHARACTERISTICS
(Ta=-40 ∼ +85°C; VA, VD=2.4 ∼ 3.6V; CL=20pF)
Parameter
Symbol
min
Master Clock Timing (MCLK)
Frequency: 128fs, 256fs, 512fs
fCLK
2.048
192fs, 384fs, 768fs
fCLK
3.072
Pulse Width Low
tCLKL
0.4/fCLK
Pulse Width High
tCLKH
0.4/fCLK
LRCK (VA, VD = 2.4V∼3.6V)
Normal Speed: 256fs, 512fs
Frequency
384fs, 768fs
Double Speed: 256fs
384fs
Duty Cycle Slave mode
Master mode
LRCK (VA, VD = 2.7V∼3.6V)
Frequency
Quad Speed: 128fs
192fs
Duty Cycle Slave mode
Master mode
Audio Interface Timing
Slave mode (VA, VD = 2.4V ∼ 2.7V)
BCLK Period: Normal Speed
Double Speed
BCLK Pulse Width Low
Pulse Width High
LRCK Edge to BCLK “↑”
(Note 14)
BCLK “↑” to LRCK Edge
(Note 14)
LRCK to SDTO (MSB) (Except I2S mode)
BCLK “↓” to SDTO
SDTI Hold Time
SDTI Setup Time
Slave mode (VA, VD = 2.7V ∼ 3.6V)
BCLK Period: Normal Speed
Double / Quad Speed
BCLK Pulse Width Low
Pulse Width High
LRCK Edge to BCLK “↑”
(Note 14)
BCLK “↑” to LRCK Edge
(Note 14)
LRCK to SDTO (MSB) (Except I2S mode)
BCLK “↓” to SDTO
SDTI Hold Time
SDTI Setup Time
typ
max
Units
-
27.648
36.864
-
MHz
MHz
ns
ns
fs
fs
fs
fs
8
8
54
48
45
-
50
54
48
108
96
55
-
kHz
kHz
kHz
kHz
%
%
fs
fs
108
96
45
-
50
216
192
55
-
kHz
kHz
%
%
tBCK
tBCK
tBCKL
tBCKH
tLRB
tBLR
tDLR
tBSD
tSDH
tSDS
1/128fs
1/64fs
60
60
20
20
20
20
-
40
40
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tBCK
tBCK
tBCKL
tBCKH
tLRB
tBLR
tDLR
tBSD
tSDH
tSDS
1/128fs
1/64fs
33
33
20
20
13
13
-
20
20
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 14. BCLK rising edge must not occur at the same time as LRCK edge.
MS0559-E-00
2006/11
- 11 -
ASAHI KASEI
[AK4556]
SWITCHING CHARACTERISTICS (Continued)
(Ta=-40 ∼ +85°C; VA, VD=2.4 ∼ 3.6V; CL=20pF)
Parameter
Symbol
min
typ
Master mode (VA, VD = 2.4V ∼ 2.7V)
BCLK Frequency
fBCK
64fs
BCLK Duty
dBCK
50
BCLK “↓” to LRCK
tMBLR
−20
BCLK “↓” to SDTO
tBSD
−20
SDTI Hold Time
tSDH
20
SDTI Setup Time
tSDS
20
Master mode (VA, VD = 2.7V ∼ 3.6V)
BCLK Frequency
fBCK
64fs
BCLK Duty
dBCK
50
BCLK “↓” to LRCK
tMBLR
−20
BCLK “↓” to SDTO
tBSD
−20
SDTI Hold Time
tSDH
13
SDTI Setup Time
tSDS
13
Reset Timing
PDN Pulse Width
(Note 15)
PDN “↑” to SDTO valid
(Note 16)
Slave Mode
Noraml Speed
Double Speed
Quad Speed
Master Mode
Normal Speed
Double Speed
Quad Speed
max
Units
40
40
-
Hz
%
ns
ns
ns
ns
20
20
-
Hz
%
ns
ns
ns
ns
tPW
150
-
-
ns
tPWV
tPWV
tPWV
tPWV
tPWV
tPWV
-
4134
8262
16518
4131
8259
16515
-
1/fs
1/fs
1/fs
1/fs
1/fs
1/fs
Note 15. The AK4556 can be reset by bringing the PDN pin = “L”.
Note 16. This cycle is the number of LRCK rising edges from the PDN pin = “H”.
„ Timing Diagram
1/fCLK
VIH
VIL
MCLK
tCLKH
tCLKL
1/fs
VIH
VIL
LRCK
tBCK
VIH
VIL
BCLK
tBCKH
tBCKL
Figure 2. Clock Timing
MS0559-E-00
2006/11
- 12 -
ASAHI KASEI
[AK4556]
VIH
VIL
LRCK
tBLR
tLRB
VIH
VIL
BCLK
tDLR
tDBS
50%VD
SDTO
tSDS
tSDH
VIH
VIL
SDTI
Figure 3. Audio Data Input/Output Timing (Slave)
LRCK
50%VD
tLRB
BCLK
50%VD
tDLR
tBSD
50%VD
SDTO
tSDS
tSDH
VIH
VIL
SDTI
Figure 4. Audio Data Input/Output Timing (Master)
tPW
PDN
VIL
tPWV
SDTO
50%VD
Figure 5. Reset Timing
MS0559-E-00
2006/11
- 13 -
ASAHI KASEI
[AK4556]
OPERATION OVERVIEW
„ System Clock
MCLK, BCLK and LRCK (fs) clocks are required in slave mode. The LRCK clock input must be synchronized with
MCLK, however the phase is not critical. Table 1 shows the relationship of typical sampling frequency and the system
clock frequency. MCLK frequency, BCLK frequency, HPF (ON or OFF) and master/slave are selected by CKS3-0 pins
as shown in Table 3. When MCLK is 192fs, 384fs or 768fs, the sampling frequency does not support variable pitch (Table
2).
All external clocks (MCLK, BCLK and LRCK) must be present unless the PDN pin = “L”. If these clocks are not
provided, the AK4556 may draw excess current due to its use of internal dynamically refreshed logic. If the external
clocks are not present, place the AK4556 in power-down mode (PDN pin = “L”). In master mode, the master clock
(MCLK) must be provided unless the PDN pin = “L”.
fs
32kHz
44.1kHz
48kHz
96kHz
192kHz
128fs
N/A
N/A
N/A
N/A
24.576MHz
MCLK
192fs
256fs
384fs
512fs
N/A
8.192MHz
12.288MHz
16.384MHz
N/A
11.2896MHz
16.9344MHz
22.5792MHz
N/A
12.288MHz
18.432MHz
24.576MHz
N/A
24.576MHz
36.864MHz
N/A
36.864MHz
N/A
N/A
N/A
Table 1. System Clock Example (N/A: Not Available)
768fs
24.576MHz
33.8688MHz
36.864MHz
N/A
N/A
Mode
Sampling Frequency
MCLK
256fs/512fs
8kHz ≤ fs ≤ 54kHz
Normal Speed
384fs/768fs
8kHz ≤ fs ≤ 48kkHz
256fs
54kHz < fs ≤ 108kHz
Double Speed
384fs
48kHz < fs ≤ 96kHz
128fs
108kHz < fs ≤ 216kHz
Quad Speed
192fs
96kHz < fs ≤ 192kHz
Table 2. Sampling Frequency Range
MS0559-E-00
2006/11
- 14 -
ASAHI KASEI
[AK4556]
Mode
CKS3
pin
CKS2
pin
CKS1
pin
CKS0
pin
HPF
M/S
0 (*)
L
L
L
L
ON
Slave
1
L
L
L
H
ON
Slave
2
L
L
H
L
OFF
Slave
3
L
L
H
H
OFF
Slave
4
L
H
L
L
ON
Slave
5
L
H
L
H
ON
Slave
6
L
H
H
L
OFF
Slave
7
L
H
H
H
OFF
Slave
8
H
L
L
L
ON
Slave
9
H
L
L
H
ON
Slave
10
H
L
H
L
OFF
Slave
11
H
L
H
H
OFF
Slave
12
H
H
L
13
H
H
L
14
H
H
H
15
H
H
H
* AK4552 Compatible mode
L
H
L
H
ON
ON
ON
ON
Master
Master
Master
Master
MCLK
128/192fs (Quad Speed)
256/384fs (Double Speed)
512/768fs (Normal Speed)
256/384/512/768fs
(Normal Speed)
128/192fs (Quad Speed)
256/384fs (Double Speed)
512/768fs (Normal Speed)
256/384/512/768fs
(Normal Speed)
128/192fs (Quad Speed)
256/384fs (Double Speed)
512/768fs (Normal Speed)
256/384/512/768fs
(Normal Speed)
128/192fs (Quad Speed)
256/384fs (Double Speed)
512/768fs (Normal Speed)
256/384/512/768fs
(Normal Speed)
128/192fs (Quad Speed)
256/384fs (Double Speed)
512/768fs (Normal Speed)
256/384/512/768fs
(Normal Speed)
128/192fs (Quad Speed)
256/384fs (Double Speed)
512/768fs (Normal Speed)
256/384/512/768fs
(Normal Speed)
256fs (Double Speed)
512fs (Normal Speed)
128fs (Quad Speed)
256fs (Normal Speed)
Audio Interface
Format
(See Table 4)
LJ/RJ
LJ/RJ
LJ/RJ
LJ/RJ
I 2S
I 2S
I 2S
I 2S
LJ
LJ
LJ
LJ
I 2S
I 2S
I 2S
I 2S
Table 3. Mode Setting
„ Audio Serial Interface Format
Three modes are supported and selected by the CKS3-0 pins as shown in Table 3 and Table 4. In all modes the serial data
format is MSB first, 2’s complement. The SDTO is clocked out on the falling edge of BCLK and the SDTI is latched on
the rising edge. The audio interface supports both master and slave modes. In slave mode, BCLK and LRCK are input. In
master mode, BCLK and LRCK are output with the BCLK frequency fixed to 64fs and the LRCK frequency fixed to 1fs.
Also audio interface format is fixed to I2S mode.
Mode
LJ
I2S
LJ/RJ
SDTO
24bit, MSB justified
24bit, I2S Compatible
24bit, MSB justified
SDTI
LRCK
24bit, MSB justified
H/L
24bit, I2S Compatible
L/H
24bit, LSB justified
H/L
Table 4. Audio Interface Format
MS0559-E-00
BCLK (Slave)
≥ 48fs
≥ 48fs or 32fs
≥ 48fs
BCLK (Master)
64fs
-
2006/11
- 15 -
ASAHI KASEI
[AK4556]
LRCK
0
1
2
18
19
20
21
22
23
24
25
0
1
2
18
19
20
21
22
23
24
25
0
1
BCLK(64fs)
SDTO(o)
23 22
5
4
3
2
1
0
23 22
5
4
3
2
1
0
SDTI(i)
23 22
5
4
3
2
1
0
Don’t Care 23 22
5
4
3
2
1
0 Don’t Care
23:MSB, 0:LSB
Lch Data
23
Rch Data
Figure 6. Mode LJ Timing
LRCK
0
1
2
3
19
20
21
22
23
24
25
0
1
2
3
19
20
21
22
23
24
25
0
1
BCLK(64fs)
SDTO(o)
23 22
5
4
3
2
1
0
23 22
5
4
3
2
1
0
SDTI(i)
23 22
5
4
3
2
1
0
Don’t Care 23 22
5
4
3
2
1
0 Don’t Care
23:MSB, 0:LSB
Lch Data
Rch Data
2
Figure 7. Mode I S Timing
LRCK
0
1
2
8
9
10
20
21
31
0
1
2
8
9
10
20
21
31
0
1
BCLK(64fs)
SDTO(o)
SDTI(i)
23 22
16 15 14
Don’t Care
23:MSB, 0:LSB
0
23 22
12 11
23 22
1
0
16 15 14
Don’t Care
Lch Data
23 22
0
12 11
23
1
0
Rch Data
Figure 8. Mode LJ/RJ Timing
„ De-emphasis Filter
The DAC includes a digital de-emphasis filter (tc=50/15µs) via an integrated by IIR filter. This filter corresponds to three
frequencies (32kHz, 44.1kHz, 48kHz). This setting is done by DEM0 and DEM1 pins. This filter is always OFF in double
and quad speed modes.
DEM1
DEM0
Mode
0
0
44.1kHz
0
1
OFF
1
0
48kHz
1
1
32kHz
Table 5. De-emphasis filter control
MS0559-E-00
2006/11
- 16 -
ASAHI KASEI
[AK4556]
„ Digital High Pass Filter
The ADC has a Digital High Pass Filter (HPF) for DC-offset cancellation. The cut-off frequency of the HPF is 1Hz at
fs=48kHz and the frequency response at 20Hz is -0.12dB. It also scales with the sampling frequency (fs). The HPF is
controlled by CKS3-0 pins (Table 3). If the HPF setting (ON/OFF) is changed at operating, click noise occurs by
changing DC offset.
„ Power-down & Reset
The ADC and DAC are placed in power-down mode by bringing the PDN pin = “L”, and each digital filter is also reset at
the same time. These resets should always be done after power-up. For the ADC, an analog initialization cycle starts after
exiting the power-down mode. The output data, (SDTO) becomes available after 4131 cycles (@ Normal Speed) of
LRCK in master mode or 4134 cycles (@ Normal Speed) of LRCK in slave mode. During initialization, the ADC digital
data outputs of both channels are forced to a 2’s complement “0”. The ADC output data settles and correlates to the input
signal after the end of initialization (settling time is approximately equal to the group delay time.) The initialization cycle
does not affect the DAC operation.
PDN
(1)
ADC Internal
State
Normal Operation
DAC Internal
State
Normal Operation
Power-down
Init Cycle
Normal Operation
Normal Operation
Power-down
GD
GD
ADC In
(Analog)
ADC Out
(Digital)
“0”data
Idle Noise
DAC In
(Digital)
“0”data
GD
DAC Out
(Analog)
Clock In
MCLK,LRCK,BCLK
Idle Noise
GD
(2)
(2)
(3)
(4)
The clocks may be stopped.
External
Mute
Mute ON
Notes:
(1) Slave mode (typ): 4134/fs @ Normal Speed, 8262/fs @ Double Speed, 16518/fs @ Quad Speed
Master mode (typ): 4131/fs @ Normal Speed, 8259/fs @ Double Speed, 16515/fs @ Quad Speed
(2) Click noise occurs at the “↑↓” of PDN signal. Mute the analog output externally if the click noise influences
system performance.
(3) LOUT/ROUT pins become Hi-Z at power-down.
(4) In master mode, LRCK and BICK output “L” at power-down.
Figure 9. Power-up/down Sequence
MS0559-E-00
2006/11
- 17 -
ASAHI KASEI
[AK4556]
„ System Reset
The AK4556 should be reset once by bringing the PDN pin “L” after power-up. In slave mode, reset and power down
states are released by MCLK and the internal timing starts clocking on the rising edge of LRCK in Mode LJ and Mode
LJ/RJ. In Mode I2S, it starts clocking on the falling edge of BCLK after the first rising edge of BCLK after the falling edge
of LRCK. The AK4556 is in power down state until LRCK is input. In master mode, reset and power down states are
released by MCLK. The internal timing also starts by MCLK.
MS0559-E-00
2006/11
- 18 -
ASAHI KASEI
[AK4556]
SYSTEM DESIGN
Figure 10 shows the system connection diagram. An evaluation board [AKD4556] is available which demonstrates
application circuit, optimum layout, power supply arrangements and measurement results.
10u
10u
10u 0.1u
Analog Supply
(3.0V)
+
+
5.1 ohm
Mode
Control
1 RIN
ROUT 20
2 LIN
LOUT 19
3 VSS
VCOM 18
4 VA
5 VD
AK4556
+
2.2u
0.1u
Reset
PDN 17
BCLK 16
10u 0.1u
6 DEM0
MCLK 15
7 DEM1
LRCK 14
8 SDTO
SDTI 13
9 CKS0
CKS3 12
10 CKS1
CKS2 11
Audio
Controller
Figure 10. System Connection Diagram Example (Mode 0: AK4552 Compatible Mode)
Notes:
- VSS of the AK4556 should be distributed separately from the ground external digital devices.
- Do not allow digital input pins to float.
- When LOUT/ROUT drives some capacitive load, a 220Ω resistor should be added in series between LOUT/ROUT
and capacitive load. In this case, LOUT/ROUT pins can drive capacitor of 400pF.
MS0559-E-00
2006/11
- 19 -
ASAHI KASEI
[AK4556]
1. Grounding and Power Supply Decoupling
The AK4556 requires careful attention to power supply and grounding arrangements. VA pin is usually supplied from
analog supply in system and VD pin is supplied from VA pin via 5.1Ω. Alternatively if VA and VD pins are supplied
separately, the power up sequence is not critical. VSS pin of the AK4556 should 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 AK4556 as possible, with the small value ceramic
capacitor being the nearest.
2. Voltage Reference
The input to VA voltage sets the analog input/output range. A 0.1µF ceramic capacitor and a 10µF electrolytic capacitor
are connected to VA and VSS pins, normally. VCOM is a signal ground of this chip. A 2.2µF electrolytic capacitor in
parallel with a 0.1µF ceramic capacitor attached to these pins eliminates the effects of high frequency noise. No load
current may be drawn from VCOM pin. All signals, especially clock, should be kept away from the VA, VD and VCOM
pins in order to avoid unwanted coupling into the AK4556.
3. Analog Inputs
The ADC inputs are single-ended and internally biased to the common voltage (50%VA) with 8kΩ (typ, @fs=48kHz,
96kHz, 192kHz) resistance. The input signal range scales with the supply voltage and nominally 0.7xVA Vpp (typ). The
ADC output data format is 2’s complement. The internal HPF removes the DC offset.
The AK4556 samples the analog inputs at 128fs (@ fs=48kHz), 64fs (@fs=96kHz) or 32fs(@192kHz). The digital filter
rejects noise above the stop band except for multiples of the sampling frequency of analog inputs. The AK4556 includes
an anti-aliasing filter (RC filter) to attenuate a noise around the sampling frequency of analog inputs.
4. Analog Outputs
The analog outputs are also single-ended and centered around the VCOM voltage. The input signal range scales with the
supply voltage and nominally 0.7 x VA Vpp (typ). The DAC input data format is 2’s complement. The output voltage is
a positive full scale for 7FFFFFH(@24bit) and a negative full scale for 800000H(@24bit). The ideal output is VCOM
voltage for 000000H(@24bit). If the noise generated by the delta-sigma modulator beyond the audio band would be the
problem, the attenuation by external filter is required.
DC offsets on analog outputs are eliminated by AC coupling since DAC outputs have DC offsets of a few mV.
MS0559-E-00
2006/11
- 20 -
ASAHI KASEI
[AK4556]
PACKAGE
6.5 ± 0.1
11
1
10
0.105 ~ 0.175
0.10
0.65
6.4 ± 0.2
4.4 ± 0.1
0.60 ± 0.10
20
M
0o ~ 8o
0.195 ~ 0.275
0.10 S
1.20MAX
0.10 ± 0.05
1.00 ± 0.05
S
„ Package & Lead frame material
Package molding compound:
Lead frame material:
Lead frame surface treatment:
Epoxy
Cu
Solder (Pb free) plate
MS0559-E-00
2006/11
- 21 -
AKM CONFIDENTIAL
ASAHI KASEI
[AK4556]
MARKING
AKM
4556VT
XXXXXX
1) Pin #1 indication
2) Date Code: XXXXXX (6 digits)
3) Marketing Code: 4556VT
Revision History
Date (YY/MM/DD)
06/11/06
Revision
00
Reason
First Edition
Page
Contents
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.
Rev.0.4
2005/12
- 22 -