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ASAHI KASEI

[AK5381]

Rev.0.4

2002/08

- 1 -

The AK5381 is a stereo A/D Converter with wide sampling rate of 4kHz 

∼ 96kHz and is suitable for

High-end audio system. The AK5381 achieves high accuracy and low cost by using Enhanced dual bit
ΔΣ techniques. The AK5381 requires no external components because the analog inputs are single-
ended. The audio interface has two formats (MSB justified, I

2

S) and can correspond to many systems like

music instrument and AV receiver.

†

 Stereo ΔΣ ADC

†

†

†

†

†

†

†

†

256fs/384fs/512fs/768fs (∼ 48kHz)

(∼ 96kHz)

†

†

†

†

 Power Supply: 4.5 ∼ 5.5V (VA)

2.7 ∼ 5.5V (VD at 48kHz)

3.0 ∼ 5.5V (VD at 96kHz)

†

 Ta = -40 ∼ 85°C

†

†

ΔΣ
Modulator

MCLK

AINL

LRCK

SCLK

SDTO

DIF

VCOM

AINR

AGND

VA

CKS1

DGND

VD

CKS2

ΔΣ
Modulator

PDN

CKS0

24Bit 96kHz ΔΣ ADC

ASAHI KASEI

[AK5381]

Rev.0.4

2002/08

- 2 -

„

AK5381VT

−40 ∼ +85°C

16pin TSSOP (0.65mm pitch)

AKD5381

Evaluation Board for AK5381

„

CKS1

VCOM

VD

DGND

AINR

AINL

AGND

VA

Top View

8

7

6

5

4

3

2

1

9

10

11

12

13

14

15

16

DIF

PDN

LRCK

MCLK

SCLK

CKS2

CKS0

SDTO

„

AK5380

AK5381

Master Mode

Not Available

Available

HPF OFF

Not Available

Available

VD (Digital Supply)

4.5 to 5.5V@fs=96kHz

3.0 to 5.5V@fs=96kHz

Pin #3

NC

CKS1

Pin #15

TTL

CKS2

Pin #16

TST

CKS0

ASAHI KASEI

[AK5381]

Rev.0.4

2002/08

- 3 -

No.

Pin Name

I/O

Function

1

AINR

I

Rch Analog Input Pin

2

AINL

I

Lch Analog Input Pin

3

CKS1

I

Mode Select 1 Pin

4

VCOM

O

Common Voltage Output Pin, VA/2

    Bias voltage of ADC input.

5

AGND

-

Analog Ground Pin

6

VA

-

Analog Power Supply Pin, 4.5 

∼ 5.5V

7

VD

-

Digital Power Supply Pin, 2.7 

∼ 5.5V(fs=4k ∼ 48kHz), 3.0 ∼ 5.5V(fs=48k ∼ 96kHz)

8

DGND

-

Digital Ground Pin

9

SDTO

O

Audio Serial Data Output Pin

    “L” Output at Power-down mode.

10

LRCK

I/O

Output Channel Clock Pin

    “L” Output in Master Mode at Power-down mode.

11

MCLK

I

Master Clock Input Pin

12

SCLK

I/O

Audio Serial Data Clock Pin

    “L” Output in Master Mode at Power-down mode.

13

PDN

I

Power Down Mode Pin

    “H”: Power up,    “L”: Power down

14

DIF

I

Audio Interface Format Pin

    “H” : 24bit I

2

S Compatible,    “L” : 24bit MSB justified

15

CKS2

I

Mode Select 2 Pin

16

CKS0

I

Mode Select 0 Pin

Note: All digital input pins should not be left floating.

ASAHI KASEI

[AK4358]

REV 0.7

2002/06

- 1 -

The AK4358 is eight channels 24bit DAC corresponding to digital audio system. Using AKM's advanced 

multi bit architecture for its modulator the AK4358 delivers a wide dynamic range while preserving 

linearity for improved THD+N performance. The AK4358 has full differential SCF outputs, removing the 

need for AC coupling capacitors and increasing performance for systems with excessive clock jitter. The 

AK4358 accepts 192kHz PCM data and 1-Bit DSD data, ideal for a wide range of applications including 

DVD-Audio and SACD.

 Sampling Rate Ranging from 8kHz to 192kHz

 24Bit 8 times Digital Filter with Slow roll-off option

 High Tolerance to Clock Jitter

 Low Distortion Differential Output

 DSD Data input available

 Channel Independent Digital De-emphasis for 32, 44.1 & 48kHz sampling

 Zero Detect function

 Channel Independent Digital Attenuator with soft-transition (3 Speed mode)

 3-wire Serial and I

 I/F format: MSB justified, LSB justified (16bit, 20bit, 24bit), I

 Master clock: 256fs, 384fs, 512fs or 768fs (PCM Normal Speed Mode)

 Power Supply: 4.75 to 5.25V

SCF

DAC

DATT

DZF
LOUT1+
LOUT1-

SCF

DAC

DATT

ROUT1+
ROUT1-

SCF

DAC

DATT

LOUT2+
LOUT2-

SCF

DAC

DATT

ROUT2+
ROUT2-

SCF

DAC

DATT

LOUT3+
LOUT3-

SCF

DAC

DATT

ROUT3+
ROUT3-

Audio

I/F

Control

Register

MCLK
LRCK
BICK

DCLK
DSDL1
DSDR1

3-wire
or I2C

SDTI1
SDTI2
SDTI3

DSDL2
DSDR2
DSDL3
DSDR3

PCM

DSD

SCF

DAC

DATT

LOUT4+
LOUT4-

SCF

DAC

DATT

ROUT4+
ROUT4-

DSDL4
DSDR4

SDTI4