AKM AK4621 Manuale utente

[AKD4621-B]

<KM100803> 2022/05

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GENERAL DESCRIPTION

The AKD4621-B is an evaluation board for the AK4621, the 24Bit A/D & D/A converter. The AKD4621-B

can evaluate A/D converter and D/A converter separately in addition to loopback mode (A/DD/A). The

AKD4621-B also has the digital audio interface and can achieve the interface with digital audio systems

via opt-connector.

Ordering guide

AKD4621-B --- Evaluation board for AK4621

(Cable for connecting with printer port of IBM-AT compatible PC

and control software are packed with this. This control software

does not operate on Windows NT.)

FUNCTION

Digital interface

-DIT (AK4114): optical or BNC

-DIR (AK4114): optical or BNC

10pin header for serial control interface

AK4114

(DIR&DIT)

Opt In

Opt Out

AK4621

+15V AGND

LIN

RIN

LOUT

ROUT 10pin Header

Control Data

-15V DGND

Input

Buffer

Regulator

Output

Buffer

BNC

Figure 1. AKD4621-B Block Diagram

* Circuit diagram are attached at the end of this manual.

AK4621 Evaluation board Rev.3

AKD4621

[AKD4621-B]

<KM100803> 2022/05

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Evaluation Board Manual

Operation sequence

1) Set up of the power supply lines

Each of the power supply lines should be distributed from the power supply units.

Name

of jack

Color

of jack

Typ

Voltage

Using Default setting

+15V Green +15V Power supply for the plus terminal of OPAmp

Power supply for the regulator: T1: +15V→+5V

(Power supply for AVDD and VREF of AK4621,

power supply for Bias of OPAmp, and

power supply for the Regulator: T2: +5V→+3.3V

(Power supply for DVDD and TVDD of AK4621))

Power supply for the regulator: T3: +15V→+3.3V

(Power supply for AVDD, DVDD, TVDD of AK4114,

Power supply for logic)

Connect to +15V

(Must be connected)

-15V Blue -15V Power supply for the minus terminal of OPAmp Connect to -15V

(Must be connected)

GND Black 0V Analog ground

Digital ground Connect to GND

(Must be connected)

Table 1. Set up of the power supply lines

2) Set up the evaluation modes, jumper pins and DIP switch. (See the followings.)

3) Power on

The AK4621 should be reset once bringing SW2 (PDN) “L” upon power-up.

[AKD4621-B]

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Evaluation modes

Applicable evaluation modes

(1) Evaluation of A/D-D/A Loop back (Default)

(2) Evaluation of DAC

(3) Evaluation of ADC

1) Evaluation of A/D-D/A Loop back (Default)

1-1) Sampling speed & MCLK frequency

a) Parallel mode (Default)

SW1-1

(P/S) SW1-4

(DFS0) SW1-6

(CKS1) SW1-7

(CKS0) SW3-4

(OCKS1) SW3-5

(OCKS0)

Sampling

Speed of

AK4621

MCLK

Frequency of

AK4621

ON OFF OFF ON ON OFF Normal

Speed

512fs (Default)

ON ON OFF ON OFF OFF Double

Speed

256fs

Table 2. Sampling Speed & Master clock Frequency in parallel mode

* Parallel mode does not support quad speed mode.

b) Serial mode

SW1

(P/S) DFS1

bit DFS0

bit CMODE

bit CKS1

bit CKS0

bit SW3-4

(OCKS1) SW3-5

(OCKS0)

Sampling

Speed of

AK4621

MCLK

Frequency of

AK4621

OFF 0 0 0 0 1 ON OFF Normal

Speed

512fs

OFF 0 1 0 0 1 OFF OFF Double

Speed

256fs

OFF

Quad Speed

128fs

Table 3. Sampling Speed & Master clock Frequency in serial mode

* In serial mode, SW1-4 (DFS0), SW1-6 (CKS1) and SW1-7 (CSK0) should be always “OFF”, and DFS1, DFS0, CKS1,

CKS0 and CMODE bits in the AK4621 should be set via the printer port (PORT3).

[AKD4621-B]

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1-2) AK4114’s master clock mode & reference X’tal frequency

Mode SW3-6

(CM1)

SW3-7

(CM0)

PLL X'tal Clock source SDTO

OFF

X'tal

DAUX

(Default)

Table 4. AK4114’S Clock Operation Mode

SW3-1

(XTL1)

SW3-2

(XTL0)

X’tal Frequency

OFF

24.576MHz

(Default)

Table 5. Reference X’tal frequency

1-3) Set up the digital filter

a) Parallel mode (Default)

SW1-2

(SDFIL)

Digital Filter

OFF

Short Delay

Sharp Roll

off

(Default)

Table 6. Digital Filter Selection in parallel mode

b) Serial mode

SW1-2

(SDFIL)

SDAD

bit

Digital Filter

OFF

Sharp Roll

off

OFF

Short Delay

Table 7. Digital Filter Selection in serial mode

[AKD4621-B]

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2) Evaluation of D/A using DIR. (Optical link)

The DIR generates MCLK, BICK, LRCK and SDATA from the received data through optical

connector (PORT1). PORT1 is also used for the evaluation using such as CD test disk.

BNC connector is recommended for an evaluation of the Sound quality.

2-1) DIR input interface (Default: JP2 (RX3)="OPT")

Jumper JP2

(RX3)

Normal Speed & Double Speed OPT (Default) or BNC

Quad Speed BNC

Table 8. DIR Input Interface

2-2) Sampling speed & MCLK frequency

a) Parallel mode (Default)

SW1-1

(P/S) SW1-4

(DFS0) SW1-6

(CKS1) SW1-7

(CKS0) SW3-4

(OCKS1) SW3-5

(OCKS0)

Sampling

Speed of

AK4621

MCLK

Frequency of

AK4621

ON OFF OFF OFF OFF OFF Normal

Speed

256fs

ON OFF OFF ON ON OFF Normal

Speed

512fs (Default)

ON ON OFF ON OFF OFF Double

Speed

256fs

Table 9. Sampling Speed & Master clock Frequency in parallel mode

* Parallel mode does not support quad speed mode.

b) Serial mode

SW1-1

(P/S) DFS1

bit DFS0

bit CMODE

bit CKS1

bit CKS0

bit SW3-4

(OCKS1) SW3-5

(OCKS0)

Sampling

Speed of

AK4621

MCLK

Frequency of

AK4621

OFF 0 0 0 0 0 OFF OFF Normal

Speed

256fs

OFF 0 0 0 0 1 ON OFF Normal

Speed

512fs

OFF 0 1 0 0 1 OFF OFF Double

eed

256fs

OFF

Quad Speed

128fs

Table 10. Sampling Speed & Master clock Frequency in serial mode

* In serial mode, SW1-4 (DFS0), SW1-6 (CKS1) and SW1-7 (CSK0) should be always “OFF”, and DFS1, DFS0, CKS1,

CKS0 and CMODE bits in the AK4621 should be set via the printer port (PORT3).

[AKD4621-B]

<KM100803> 2022/05

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2-3) AK4114’s master clock mode & reference X’tal frequency

Mode SW3-6

(CM1)

SW3-7

(CM0)

PLL X'tal Clock source SDTO

OFF

PLL

Table 11. Clock Operation Mode

SW3-1

(XTL1)

SW3-2

(XTL0)

X’tal Frequency

OFF

Table 12. Reference X’tal frequency

2-4) Set up the digital filter

a) Parallel mode (Default)

SW1-2

(SDFIL)

Digital Filter

OFF

Minimum Delay

Sha

rp Roll

off

Table 13. Digital Filter Selection in parallel mode

b) Serial mode

Set up the register of the AK4621 via the pint port (PORT3).

SW1-2

(SDFIL)

SDAD

bit

SLOW

bit

Digital Filter

OFF

Sharp

Roll

off

OFF

Slow Roll

off

OFF

Minimum Delay

Table 14. Digital Filter Selection in serial mode

[AKD4621-B]

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3) Evaluation of A/D using DIT. (Optical link)

DIT generates audio bi-phase signal from received data and which is output through optical connector (PORT2).

It is possible to connect AKM’s D/A converter evaluation boards on the digital-amplifier which equips DIR

input.

3-1) DIT output interface (Default: JP7 (TX) ="OPT")

Jumper JP7

(TX)

Normal Speed & Double Speed OPT (Default) or BNC

Quad Speed BNC

Table 15. DIT Output Interface

3-2) Sampling speed & MCLK frequency

a) Parallel mode (Default)

SW1-1

(P/S) SW1-4

(DFS0) SW1-6

(CKS1) SW1-7

(CKS0) SW3-4

(OCKS1) SW3-5

(OCKS0)

Sampling

Speed of

AK4621

MCLK

Frequency of

AK4621

ON OFF OFF OFF OFF OFF Normal

Speed

256fs

ON OFF OFF ON ON OFF Normal

Speed

512fs (Default)

ON ON OFF ON OFF OFF Double

Speed

256fs

Table 16. Sampling Speed & Master clock Frequency in parallel mode

* Parallel mode does not support quad speed mode.

[AKD4621-B]

<KM100803> 2022/05

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b) Serial mode

SW1-1

(P/S) DFS1

bit DFS0

bit CMODE

bit CKS1

bit CKS0

bit SW3-4

(OCKS1) SW3-5

(OCKS0)

Sampling

Speed of

AK4621

MCLK

Frequency of

AK4621

OFF 0 0 0 0 0 OFF OFF Normal

Spe

256fs

OFF 0 0 0 0 1 ON OFF Normal

Speed

512fs

OFF 0 1 0 0 1 OFF OFF Double

Speed

256fs

OFF

Quad Speed

128fs

Table 17. Sampling Speed & Master clock Frequency in serial mode

* In serial mode, SW1-4 (DFS0), SW1-6 (CKS1) and S1-7 (CSK0) should be always “OFF”, and DFS1, DFS0, CKS1,

CKS0 and CMODE bits in the AK4621 should be set via the printer port (PORT3).

3-3) AK4114’s master clock mode & reference X’tal frequency

3-3-1) PLL is used as clock source

Synchronized signal should be set via PORT1 (optical) or J6 (BNC).

Mode SW3-6

(CM1)

SW3-7

(CM0)

PLL X'tal Clock source SDTO

OFF

PLL

Table 18. Clock Operation Mode (PLL)

SW3-1

(XTL1)

SW3-2

(XTL0)

X’tal Frequency

OFF

Table 19. Reference X’tal frequency (PLL)

3-3-2) X’tal is used as clock source (Default)

Mode SW3-6

(CM1)

SW3-7

(CM0)

PLL X'tal Clock source SDTO

OFF

’

tal

DAUX

(Default)

Table 20. Clock Operation Mode (X’tal)

SW3-1

(XTL1)

SW3-2

(XTL0)

X’tal Frequency

OFF

24.576MHz

(Default)

Table 21. Reference X’tal frequency (X’tal)

[AKD4621-B]

<KM100803> 2022/05

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3-4) Set up the digital filter

a) Parallel mode (Default)

SW1-2

(SDFIL)

Digital Filter

OFF

Short Delay

Sharp Roll

off

(Default)

Table 22. Digital Filter Selection in parallel mode

b) Serial mode

SW1-2

(SDFIL)

SDAD

bit

Digital Filter

OFF

Sharp Roll

off

OFF

Short Delay

Table 23. Digital Filter Selection in serial mode

[AKD4621-B]

<KM100803> 2022/05

- 10 -

Set up of DIP Switch: SW1, SW3

1) Set-up of SW1 (Mode set-up of AK4621)

1-1) Audio data format in parallel mode

Mode DIF

(SW1

SDTO SDTI LRCK BICK

2 OFF 24bit MSB Justified 24bit MSB Justified H/L 48fs (Default)

3 ON I2S Compatible I2S Compatible L/H 48fs

Table 24. Audio data format (Parallel mode)

1-2) De-emphasis control in parallel mode

DEM0 pin

(SW1

MODE

OFF

ON (

4.1KHz)

OFF

(Default)

Table 25. De-emphasis control (Parallel mode)

1-3) Parallel mode/ serial mode

P/S pin

(SW1

MODE

OFF

Serial

Parallel

(Default)

Table 26. Set up P/S pin

2) Set-up of SW3 (AK4114’s mode set-up)

2-1) Audio data format

Mode DIF0

(SW3

SDTO SDTI LRCK BICK

4 OFF 24bit MSB Justified 24bit MSB Justified H/L 48fs (Default)

5 ON I2S Compatible I2S Compatible L/H 48fs

Table 27. Audio data format

* DIF1=L and DIF2=H are fixed in AKD4621-B evaluation board.

Other Jumper pin set up

JP3, JP4, JP5, JP6: Input mode selection of A/D converter.

DIFF: Analog differential input mode. <Default>

SINGLE: Analog single-end mode can not be selected on this board.

JP2, JP7: The interface selection of digital input and output.

OPT: Select the optical connector.

BNC: Select the BNC connector. <Default>

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