CX25853-12Z - CONEXANT SYSTEMS

[AK4556]

MS0559-E-02 2015/11

- 1 -

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: 20-pin TSSOP

 Upper compatible with AK4552

3V 192kHz 24Bit  CODEC

AK4556

[AK4556]

MS0559-E-02 2015/11

- 2 -

Modulator

MCLK

VA

VSS

LOUT

LIN

LRCK

BCLK

VCOM

RIN



Modulator

Decimation

Filter

Serial I/O

Interface

Common Voltage

SDTO



Decimation

Filter

SDTI

CKS3

Clock

Divider

ROUT

8X

Interpolator

8X

Interpolator



Modulator



Modulator

PDN

LPF

CKS2

VD

CKS1

CKS0

DEM0

DEM1

Figure 1. Block Diagram

■ Compatibility with the AK4552

1. Function

Function

AK4552

AK4556

fs (max)

100kHz

216kHz

HFP Cut-off

3.7Hz @ fs = 48kHz

1Hz @ fs = 48kHz

HPF Disable

No

Yes

ADC

Input Level

0.617 x VA

0.7 x VA

Input Resistance

34k @ fs = 44.1kHz, 24k @ fs = 96kHz

8k@ fs = 48kHz, 96kHz, 192kHz

Init Cycle

2081/fs

4134/fs @ Normal Speed, Slave mode

S/(N+D)

89dB

91dB

DR, S/N

97dB

103dB

DF

SA

65dB

68dB

SB

29.4kHz

28kHz

GD

17/fs

18/fs

DAC

Output Level

0.583 x VA

0.7 x VA

Road Resistance

10k

5k

S/(N+D)

88dB

90dB

DR, S/N

100dB

106dB

DF

SA

43dB

54dB

GD

15.4/fs

21/fs

MCLK (Slave)

256/384/512/768fs @ Normal Speed mode

256/384/512/768fs @ Normal Speed

256/384fs @ Double Speed Mode

128/192fs @ Double Speed Monitor

256/384fs @ Double Speed

64/96/128/192fs @ Quad Speed Monitor

128/192fs @ Quad Speed

Monitor Mode

Yes (Double / Quad)

No

M/S mode

Slave

Master / Slave

Audio I/F

ADC

24bit MSB justified

24bit MSB justified / I2S

DAC

24bit LSB justified

24bit MSB justified /24bit LSB justified / I2S

Idd (Vdd = 3V)

14mA

27.5mA

VDD

2.4V to 4.0V

2.4V to 3.6V (Normal/Double Speed)

2.7V to 3.6V (Quad Speed)

Package

16TSSOP

(5.0mm x 6.4mm, 0.65mm Pitch)

20TSSOP

(6.5mm x 6.4mm, 0.65mm Pitch)

[AK4556]

MS0559-E-02 2015/11

- 3 -

2. Pin Layout

1

RIN

LIN

VA

VSS

VD

DEM0

DEM1

SDTO

Top

View

2

3

4

5

6

7

8

ROUT

LOUT

PDN

BCLK

MCLK

LRCK

SDTI

20

19

18

17

16

15

14

13

VCOM

CKS0

CSK1

9

10

CKS3

CSK2

12

11

AK4552

AK4556

[AK4556]

MS0559-E-02 2015/11

- 4 -

■ Ordering Guide

AK4556VT -40  +85C 20-pin TSSOP (0.65mm pitch)

AKD4556 Evaluation Board for AK4556

■ Pin Layout

1

RIN

LIN

VA

VSS

VD

DEM0

DEM1

SDTO

Top

View

2

3

4

5

6

7

8

ROUT

LOUT

PDN

BCLK

MCLK

LRCK

SDTI

20

19

18

17

16

15

14

13

VCOM

CKS0

CSK1

9

10

CKS3

CSK2

12

11

[AK4556]

MS0559-E-02 2015/11

- 5 -

PIN/FUNCTION

No.

Pin Name

I/O

Function

1

RIN

I

Rch Analog Input Pin

2

LIN

I

Lch Analog Input Pin

3

VSS

-

Ground Pin

4

VA

-

Analog Power Supply Pin

5

VD

-

Digital Power Supply Pin

6

DEM0

I

De-emphasis Control Pin

7

DEM1

I

De-emphasis Control Pin

8

SDTO

O

Audio Serial Data Output Pin

When PDN pin is “L”, SDTO pin outputs “L”.

9

CKS0

I

Mode Setting Pin #0

10

CSK1

I

Mode Setting Pin #1

11

CSK2

I

Mode Setting Pin #2

12

CSK3

I

Mode Setting Pin #3

13

SDTI

I

Audio Serial Data Input Pin

14

LRCK

I/O

Input/Output Channel Clock Pin

When PDN pin is “L”, LRCK pin outputs “L” in master mode.

15

MCLK

I

Master Clock Input Pin

16

BCLK

I/O

Audio Serial Data Clock Pin

When PDN pin is “L”, BCLK pin outputs “L” in master mode.

17

PDN

I

Power-Down & Reset Mode Pin

“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

19

LOUT

O

Lch Analog Output Pin

When PDN pin is “L”, LOUT pin becomes Hi-Z.

20

ROUT

O

Rch Analog Output Pin

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

Pin Name

Setting

Analog Input

LIN, RIN

These pins should be open.

Analog Output

LOUT, ROUT

These pins should be open.

[AK4556]

MS0559-E-02 2015/11

- 6 -

ABSOLUTE MAXIMUM RATINGS

(VSS=0V; Note 1)

Parameter

Symbol

Min.

Max.

Unit

Power Supplies

Analog

Digital

VA

VD

-0.3

4.6

V

Input Current (Any Pin Except Supplies)

IIN

-

10

mA

Analog Input Voltage (LIN, RIN pin)

VINA

-0.3

VA+0.3

V

Digital Input Voltage (Note 2)

VIND

-0.3

VD+0.3

V

Ambient Temperature (power applied)

Ta

-40

85

C

Storage Temperature

Tstg

-65

150

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.

Unit

Power Supplies (Note 3)

Analog

Digital

Difference

VA

VD

VD - VA

2.4

-

3.0

-

3.6

0.3

V

RECOMMENDED OPERATING CONDITIONS (Quad Speed)

(VSS=0V; Note 1)

Parameter

Symbol

Min.

Typ.

Max.

Unit

Power Supplies (Note 3)

Analog

Digital

Difference

VA

VD

VD - VA

2.7

-

3.0

-

3.6

0.3

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.

[AK4556]

MS0559-E-02 2015/11

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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.

Unit

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

-

k

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

-

k

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 220 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 2.2F electrolytic capacitor and

a 0.1F ceramic capacitor.

[AK4556]

MS0559-E-02 2015/11

- 8 -

Parameter

Min.

Typ.

Max.

Unit

Power Supplies

Power Supply Current

Normal Operation (PDN pin = “H”)

VA

-

19.5

29

mA

VD

fs=48kHz

-

8

12

mA

(Note 9)

fs=96kHz

-

11

17

mA

fs=192kHz

-

14

21

mA

Power down mode (PDN pin = “L”) (Note 10)

VA+VD

-

10

100

A

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.

Max.

Unit

ADC Digital Filter (Decimation LPF):

Passband (Note 11)

0.1dB

0.2dB

3.0dB

PB

0

-

20.0

23.0

18.9

-

kHz

Stopband (Note 11)

SB

28

-

kHz

Passband Ripple

PR

-

0.04

dB

Stopband Attenuation

SA

68

-

dB

Group Delay Distortion

GD

-

0

-

s

Group Delay (Note 12)

GD

-

18

-

1/fs

ADC Digital Filter (HPF):

Frequency Response (Note 11)

3dB

0.1dB

FR

-

1.0

6.5

-

Hz

DAC Digital Filter (LPF):

Passband (Note 11)

0.06dB

6.0dB

PB

0

-

24.0

21.8

-

kHz

Stopband (Note 11)

SB

26.2

-

kHz

Passband Ripple

PR

-

0.02

dB

Stopband Attenuation

SA

54

-

dB

Group Delay Distortion

GD

-

0

-

s

Group Delay (Note 12)

GD

-

21

-

1/fs

DAC Digital Filter + Analog Filter:

Frequency Response (Note 13)

20kHz

FR

-

-0.1

-

dB

[AK4556]

MS0559-E-02 2015/11

- 9 -

FILTER CHARACTERISTICS (fs=96kHz)

(Ta= -40  +85C; VA, VD=2.4 3.6V; DEM=OFF)

Parameter

Symbol

Min.

Typ.

Max.

Unit

ADC Digital Filter (Decimation LPF):

Passband (Note 11)

0.1dB

0.2dB

3.0dB

PB

0

-

40.0

46.0

37.8

-

kHz

Stopband (Note 11)

SB

56

-

kHz

Passband Ripple

PR

-

0.04

dB

Stopband Attenuation

SA

68

-

dB

Group Delay Distortion

GD

-

0

-

s

Group Delay (Note 12)

GD

-

18

-

1/fs

ADC Digital Filter (HPF):

Frequency Response (Note 11)

3dB

0.1dB

FR

-

2.0

13.0

-

Hz

DAC Digital Filter (LPF):

Passband (Note 11)

0.06dB

6.0dB

PB

0

-

48.0

43.6

-

kHz

Stopband (Note 11)

SB

52.4

-

kHz

Passband Ripple

PR

-

0.02

dB

Stopband Attenuation

SA

54

-

dB

Group Delay Distortion

GD

-

0

-

s

Group Delay (Note 12)

GD

-

21

-

1/fs

DAC Digital Filter + Analog Filter:

Frequency Response (Note 13)

40kHz

FR

-

-0.3

-

dB

FILTER CHARACTERISTICS (fs=192kHz)

(Ta= -40  +85C; VA, VD=2.7 3.6V; DEM=OFF)

Parameter

Symbol

Min.

Typ.

Max.

Unit

ADC Digital Filter (Decimation LPF):

Passband (Note 11)

0.1dB

0.2dB

3.0dB

PB

0

-

57.0

90.3

56.6

-

kHz

Stopband (Note 11)

SB

112

-

kHz

Passband Ripple

PR

-

0.02

dB

Stopband Attenuation

SA

70

-

dB

Group Delay Distortion

GD

-

0

-

s

Group Delay (Note 12)

GD

-

18

-

1/fs

ADC Digital Filter (HPF):

Frequency Response (Note 11)

3dB

0.1dB

FR

-

4.0

26.0

-

Hz

DAC Digital Filter (LPF):

Passband (Note 11)

0.5dB

6.0dB

PB

0

-

96.0

87.0

-

kHz

Stopband (Note 11)

SB

104.9

-

kHz

Passband Ripple

PR

-

0.02

dB

Stopband Attenuation

SA

54

-

dB

Group Delay Distortion

GD

-

0

-

s

Group Delay (Note 12)

GD

-

21

-

1/fs

DAC Digital Filter + Analog Filter:

Frequency Response (Note 13)

40kHz

FR

-

-0.3

-

dB

[AK4556]

MS0559-E-02 2015/11

- 10 -

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

Symbol

Min.

Typ.

Max.

Unit

High-Level Input Voltage

Low-Level Input Voltage

VIH

VIL

70VD

-

30VD

V

High-Level Output Voltage (Iout=-100A)

Low-Level Output Voltage (Iout=100A)

VOH

VOL

VD-0.5

-

0.5

V

Input Leakage Current

Iin

-

 10

A

[AK4556]

MS0559-E-02 2015/11

- 11 -

SWITCHING CHARACTERISTICS

(Ta=-40  +85C; VA, VD=2.4  3.6V; CL=20pF)

Parameter

Symbol

Min.

Typ.

Max.

Unit

Master Clock Timing (MCLK)

Frequency: 128fs, 256fs, 512fs

192fs, 384fs, 768fs

Pulse Width Low

Pulse Width High

fCLK

tCLKL

tCLKH

2.048

3.072

0.4/fCLK

-

27.648

36.864

-

MHz

ns

LRCK (VA, VD = 2.4V3.6V)

Frequency

Normal Speed: 256fs, 512fs

384fs, 768fs

fs

8

-

54

48

kHz

Double Speed: 256fs

384fs

fs

54

48

-

108

96

kHz

Duty Cycle

Slave mode

Master mode

45

-

50

55

-

%

LRCK (VA, VD = 2.7V3.6V)

Frequency

Quad Speed: 128fs

192fs

fs

108

96

-

216

192

kHz

Duty Cycle

Slave mode

Master mode

45

-

50

55

-

%

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

tBCK

tBCKL

tBCKH

tLRB

tBLR

tDLR

tBSD

tSDH

tSDS

1/128fs

1/64fs

60

20

-

20

-

40

-

ns

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

tBCK

tBCKL

tBCKH

tLRB

tBLR

tDLR

tBSD

tSDH

tSDS

1/128fs

1/64fs

33

20

-

13

-

20

-

ns

Note 14. BCLK rising edge must not occur at the same time as LRCK edge.

[AK4556]

MS0559-E-02 2015/11

- 12 -

SWITCHING CHARACTERISTICS (Continued)

(Ta=-40  +85C; VA, VD=2.4  3.6V; CL=20pF)

Parameter

Symbol

Min.

Typ.

Max.

Unit

Master mode (VA, VD = 2.4V  2.7V)

BCLK Frequency

BCLK Duty

BCLK “” to LRCK

BCLK “” to SDTO

SDTI Hold Time

SDTI Setup Time

fBCK

dBCK

tMBLR

tBSD

tSDH

tSDS

-

20

20

64fs

50

-

40

-

Hz

%

ns

Master mode (VA, VD = 2.7V  3.6V)

BCLK Frequency

BCLK Duty

BCLK “” to LRCK

BCLK “” to SDTO

SDTI Hold Time

SDTI Setup Time

fBCK

dBCK

tMBLR

tBSD

tSDH

tSDS

-

20

13

64fs

50

-

20

-

Hz

%

ns

Reset Timing

PDN Pulse Width (Note 15)

tPW

150

-

ns

PDN “” to SDTO valid (Note 16)

Slave Mode Noraml Speed

tPWV

-

4134

-

1/fs

Double Speed

tPWV

-

8262

-

1/fs

Quad Speed

tPWV

-

16518

-

1/fs

Master Mode Normal Speed

tPWV

-

4131

-

1/fs

Double Speed

tPWV

-

8259

-

1/fs

Quad Speed

tPWV

-

16515

-

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

MCLK

1/fCLK

tCLKH tCLKL

VIH

VIL

LRCK

1/fs

VIH

VIL

BCLK

tBCK

VIH

VIL

tBCKH tBCKL

Figure 2. Clock Timing

[AK4556]

MS0559-E-02 2015/11

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VIH

LRCK

VIL

VIH

BCLK

tBLR

VIL

tLRB

tDLR tDBS

SDTO

VIL

50%VD

tSDS tSDH

SDTI

Figure 3. Audio Data Input/Output Timing (Slave)

VIH

LRCK 50%VD

BCLK

tLRB

tDLR tBSD

SDTO

VIL

50%VD

tSDS tSDH

SDTI

50%VD

Figure 4. Audio Data Input/Output Timing (Master)

PDN

SDTO

VIL

tPWV

tPW

50%VD

Figure 5. Reset Timing

[AK4556]

MS0559-E-02 2015/11

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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

MCLK

128fs

192fs

256fs

384fs

512fs

768fs

32kHz

N/A

8.192MHz

12.288MHz

16.384MHz

24.576MHz

44.1kHz

N/A

11.2896MHz

16.9344MHz

22.5792MHz

33.8688MHz

48kHz

N/A

12.288MHz

18.432MHz

24.576MHz

36.864MHz

96kHz

N/A

24.576MHz

36.864MHz

N/A

192kHz

24.576MHz

36.864MHz

N/A

Table 1. System Clock Example (N/A: Not Available)

Mode

Sampling Frequency

MCLK

Normal Speed

8kHz  fs  54kHz

256fs/512fs

8kHz  fs  48kkHz

384fs/768fs

Double Speed

54kHz < fs  108kHz

256fs

48kHz < fs  96kHz

384fs

Quad Speed

108kHz < fs  216kHz

128fs

96kHz < fs  192kHz

192fs

Table 2. Sampling Frequency Range

[AK4556]

MS0559-E-02 2015/11

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Mode

CKS3

CKS2

CKS1

CKS0

HPF

M/S

MCLK

Audio Interface

Format

(See Table 4)

0 (*)

L

ON

Slave

128/192fs (Quad Speed)

256/384fs (Double Speed)

512/768fs (Normal Speed)

LJ/RJ

1

L

H

ON

Slave

256/384/512/768fs

(Normal Speed)

LJ/RJ

2

L

H

L

OFF

Slave

128/192fs (Quad Speed)

256/384fs (Double Speed)

512/768fs (Normal Speed)

LJ/RJ

3

L

H

OFF

Slave

256/384/512/768fs

(Normal Speed)

LJ/RJ

4

L

H

L

ON

Slave

128/192fs (Quad Speed)

256/384fs (Double Speed)

512/768fs (Normal Speed)

I2S

5

L

H

L

H

ON

Slave

256/384/512/768fs

(Normal Speed)

I2S

6

L

H

L

OFF

Slave

128/192fs (Quad Speed)

256/384fs (Double Speed)

512/768fs (Normal Speed)

I2S

7

L

H

OFF

Slave

256/384/512/768fs

(Normal Speed)

I2S

8

H

L

ON

Slave

128/192fs (Quad Speed)

256/384fs (Double Speed)

512/768fs (Normal Speed)

LJ

9

H

L

H

ON

Slave

256/384/512/768fs

(Normal Speed)

LJ

10

H

L

H

L

OFF

Slave

128/192fs (Quad Speed)

256/384fs (Double Speed)

512/768fs (Normal Speed)

LJ

11

H

L

H

OFF

Slave

256/384/512/768fs

(Normal Speed)

LJ

12

H

L

ON

Master

256fs (Double Speed)

I2S

13

H

L

H

ON

Master

512fs (Normal Speed)

I2S

14

H

L

ON

Master

128fs (Quad Speed)

I2S

15

H

ON

Master

256fs (Normal Speed)

I2S

* AK4552 Compatible mode 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

SDTO

SDTI

LRCK

BCLK (Slave)

BCLK (Master)

LJ

24bit, MSB justified

H/L

 48fs

-

I2S

24bit, I2S Compatible

L/H

 48fs or 32fs

64fs

LJ/RJ

24bit, MSB justified

24bit, LSB justified

H/L

 48fs

-

Table 4. Audio Interface Format

[AK4556]

MS0559-E-02 2015/11

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LRCK

BCLK(64fs)

SDTO(o)

0

1

2

18

19

20

21

22

0

1

2

18

19

20

22

21

0

1

SDTI(i)

23

24

25

23

24

25

23

22

4

23

22

5

4

5

4

1

22

0

23

3

2

1

22

0

23

3

2

23:MSB, 0:LSB

Lch Data

Rch Data

Don’t Care

5

4

1

0

3

2

1

0

3

2

23

Figure 6. Mode LJ Timing

LRCK

BCLK(64fs)

SDTO(o)

0

1

2

3

19

20

21

22

0

1

2

3

19

20

22

21

0

1

SDTI(i)

23

24

25

23

24

25

23

22

4

23

22

5

4

5

4

1

22

0

23

3

2

1

22

0

23

3

2

23:MSB, 0:LSB

Lch Data

Rch Data

Don’t Care

5

4

1

0

3

2

1

0

3

2

Figure 7. Mode I2S Timing

LRCK

BCLK(64fs)

SDTO(o)

0

1

2

8

9

10

20

21

31

0

1

2

8

9

10

20

21

31

0

23

1

22

0

23

22

16

15

14

0

23

SDTI(i)

1

22

0

23

12

11

1

22

0

23

12

11

23:MSB, 0:LSB

Lch Data

Rch Data

Don’t Care

16

15

14

Figure 8. Mode LJ/RJ Timing

■ De-emphasis Filter

The DAC includes a digital de-emphasis filter (tc=50/15s) 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

44.1kHz

0

1

OFF

1

0

48kHz

1

32kHz

Table 5. De-emphasis filter control

[AK4556]

MS0559-E-02 2015/11

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■ 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.

Idle Noise

The clocks may be stopped.

ADC Internal

State

PDN

(1)

Normal Operation

Power-down

Init Cycle

Normal Operation

GD

Clock In

MCLK,LRCK,BCLK

ADC In

(Analog)

Idle Noise

“0”data

ADC Out

(Digital)

Normal Operation

Power-down

Normal Operation

DAC Internal

State

“0”data

DAC In

(Digital)

DAC Out

(Analog)

GD

External

Mute

Mute ON

GD

(2)

(4)

(3)

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

[AK4556]

MS0559-E-02 2015/11

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■ 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.

[AK4556]

MS0559-E-02 2015/11

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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.

AK4556

8

7

6

3

2

1

13

14

15

16

17

18

19

20

LIN

VA

VD

SDTO

RIN

SDTI

LRCK

MCLK

BCLK

PDN

+

0.1u

5.1 ohm

VSS

DEM0

DEM1

Analog Supply

(3.0V) VCOM

LOUT

ROUT

10u

+10u 0.1u

Mode

Control

Reset

0.1u 2.2u

+

5

4

Audio

Controller

10

9

11

12

CKS1 CKS2

CKS3CKS0

10u

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 220 resistor should be added in series between LOUT/ROUT

and capacitive load. In this case, LOUT/ROUT pins can drive capacitor of 400pF.

[AK4556]

MS0559-E-02 2015/11

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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 5.1. 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 0.1F ceramic capacitor and a 10F electrolytic capacitor

are connected to VA and VSS pins, normally. VCOM is a signal ground of this chip. A 2.2F electrolytic capacitor in

parallel with a 0.1F 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 8k (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.

[AK4556]

MS0559-E-02 2015/11

- 21 -

PACKAGE

20

0.05 ~ 0.15

0.90 ± 0.05

1.10 MAX

S

4.40 ± 0.10

0.10 S

6.5 ± 0.10

0.25 ± 0.05

0.65

11

101

6.40 ± 0.10 0.6 ± 0.10

0.15 ± 0.05

0°～8°

■Package & Lead frame material

Package molding compound: Epoxy

Lead frame material: Cu

Lead frame surface treatment: Solder (Pb free) plate

ASAHI KASEI [AK4556]

MS0559-E-02 2015/11

- 22 -

MARKING

AKM

4556VT

XXXXXXX

1) Pin #1 indication

2) Date Code: XXXXXXX (7 digits)

3) Marketing Code: 4556VT

REVISION HISTORY

Date (YY/MM/DD)

Revision

Reason

Page

Contents

06/11/06

00

First Edition

15/10/30

01

Specification

Change

21, 22

PACAGE, MARKING

Package dimension and Marking were changed.

15/11/27

02

Error

Correction

22

MARKING

“X” was added to the marking description.

ASAHI KASEI [AK4556]

MS0559-E-02 2015/11

- 23 -

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.