AKM AKD4688-A User manual

[AKD4688-A]
<KM109900> 2011/12
- 1 -
GENERAL DESCRIPTION
AKD4688-A is an evaluation board for AK4688, which is a single chip 24bit CODEC with a 2ch ADC and
a 2ch DAC. It is possible to evaluate not only A/D and D/A of the AK4688, but also asynchronous
operation characteristics. Also, the board could be connected to a digital’s audio equipment easily with
S/PDIF connectors.
Ordering guide
AKD4688-A --- Evaluation board for AK4688
(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
Compatible with 2 types of digital audio interface
- Optical (S/PDIF) input/output with DIT/DIR (AK4118A)
- 10pin headers for interfacing with external data source
Separate power supply or regulator power supply
10pin header for register control
AK4687
VSS3
LOUT ROUT DVDD
RIN3
Control Data
10pin Header
Digital Output
Digital Input
10pin Header
PORT4
AK4118A
(DIT)
10pin Header
PORT 6
AK4118A
(DIR)
LIN3 RIN2 LIN2 RIN1LIN1
AVDD1
AVSS1
AVSS2
AVDD2
REG
+5V
Figure 1. AKD4688 Block Diagram
* Circuit diagram and PCB layout are attached at the end of this manual.
Evaluation board Rev.0 for AK4688
AKD
4688
-
A
AK4688

[AKD4688-A]
<KM109900> 2011/12
- 2 -
Board Outline Chart
Outline Chart
Figure 2. AKD4688-A Outline Chart
Comment
(1) J1, J2, J3, J4, J5, J6, J7, J8, J10, J11 (RCA JACKS)
J1(white): Analog signal input RCA-Jacks. The signals are input to LIN1 pin.
J2 (red): Analog signal input RCA-Jacks. The signals are input to RIN1 pin.
J3,J4, J5,J6:Unused
J7 (white): An analog signal output RCA-Jack. The signal is output from LOUT pin.
J8 (red): An analog signal output RCA-Jack. The signal is output from ROUT pin.
J10 (black): A digital signal output RCA-Jack. The signal is output through U5 (AK4118A).
J11 (black): A digital signal input RCA-Jack. The signal is input through U6 (AK4118A).
(2) +5V, AVDD1, AVDD2, DVDD, D3.3V, AVSS1, AVSS2, VSS3, DGND
The power supply connectors which should be connected to power supplies.
Refer to the setup of power supply in Page3 for more details.
(3) PORT1 (10 pin header)
Control port. Connect the 10 wire flat cable bundled to this port.
(4) PORT4, PORT6 (10 pin header)
Audio Interfaces that clocks and data can be input and output with.
(5) PORT3, PORT5 (Optical Connecter)
PORT5 (Input): Optical digital signal is input to U6 (AK4118A).
PORT3 (Output): Optical digital signal is output from U5 (AK4118A).
AK4688
4688
Mo
de
AKD4688-A Rev.0 Evaluation Board
Asahi Kasei Microdevices Corporation
J10
J11

[AKD4688-A]
<KM109900> 2011/12
- 3 -
Operation sequence
1) Set up the power supply lines.
1-1) When AVDD1, AVDD2, DVDD and D3.3V are supplied from the regulator. <Default>
Set up the jumper pins.
JP7
AVDD1_SEL
AVDD1REG
JP8
AVDD2_SEL
AVDD2REG
JP16
D3.3V_SEL
D3.3VREG
Set up the power supply lines.
Name Color Voltage Comments
+5V Red +5V Power supply for the regulator.
AVDD1 Orange Open Power supply for AVDD1 of AK4688.
AVDD2 Orange Open Power supply for AVDD2 of AK4688.
DVDD Orange Open Power supply for DVDD of AK4688.
D3.3V Orange Open Power supply for logic circuit.
AVSS1 Black 0V Analog ground for ADC of AK4688
AVSS2 Black 0V Analog ground for DAC of AK4688.
VSS3 Black 0V Digital ground of AK4688.
DGND Black 0V Logic circuit ground.
Table 1 Setup of power supply
1-2) When AVDD1, AVDD2, DVDD, and D3.3V are supplied from the power supply connectors.
Set up the jumper pins.
JP7
AVDD1_SEL
AVDD1REG
JP8
AVDD2_SEL
AVDD2REG
JP16
D3.3V_SEL
D3.3VREG
Set up the power supply lines.
Name Color Voltage Comments
+5V Red Open The regulator is not used.
AVDD1 Orange 3.0V~3.6V (typ3.3V) Power supply for AVDD1 of AK4688.
AVDD2 Orange 3.0V~3.6V (typ3.3V) Power supply for AVDD2 of AK4688.
DVDD Orange 3.0V~3.6V (typ3.3V) Power supply for DVDD of AK4688.
D3.3V Orange 3.0V~3.6V (typ3.3V) Power supply for logic circuit.
AVSS1 Black 3.0V~3.6V (typ3.3V) Analog ground for ADC of AK4688
AVSS2 Black 0V Analog ground for DAC of AK4688.
VSS3 Black 0V Digital ground of AK4688.
DGND Black 0V Logic circuit ground.
Table 2 Setup of power supply
* Each supply line should be distributed from the power supply unit.
AVDD1 and AVDD2 should be supplied as the same voltage level.
The difference of voltage level between AVDD1, AVDD2 and DVDD should be under 0.3V.

[AKD4688-A]
<KM109900> 2011/12
- 4 -
2) Set up the evaluation mode, jumper pins and DIP switches. (See the followings.)
3) Power on.
AK4688 and AK4118A should be reset once bringing SW1, SW2, SW3, SW5 “L”upon power-up.
Evaluation mode
In case of AK4688 evaluation by using AK4118A, it is necessary to correspond to audio interface format for
AK4688 and AK4118A. About audio interface format of AK4688, refer to the datasheet of AK4688. About audio
interface format of AK4118A, refer to the datasheet of AK4118A.
Applicable Evaluation Mode
(1) Evaluation of A/D and D/A by using DIR/DIT.
(2) All interface signals are fed externally.

[AKD4688-A]
<KM109900> 2011/12
- 5 -
(1) Evaluation of A/D and D/A by using DIR/DIT
a) Set up of A/D
J10 TX (RCA-Jack) or PORT3 (Optical connector) is used.
Nothing should be connected to PORT4.
JP5
MCLK1_SEL
MCLK1MCLK2
JP6
BICK1_SEL
BICK1
BICK2
JP8
LRCK1_SEL
LRCK1LRCK2
SDTO
JP7
b) Set up of D/A
J11 RX (RCA-Jack) or PORT5 (Optical connector) is used.
Nothing should be connected to PORT6.
JP12
MCLK2 JP13 BICK2 JP14
LRCK2 JP15
SDTI
(2) All interface signals are fed externally.
a) Set up A/D
PORT4 is used.
Nothing should be connected to J10 TX (RCA-Jack) or PORT3 (Optical connector).
JP5
MCLK1_SEL
MCLK1MCLK2
JP6
BICK1_SEL
BICK1
BICK2
JP8
LRCK1_SEL
LRCK1LRCK2
SDTO
JP7
b) Set up of D/A
PORT6 is used.
Nothing should be connected to J11 RX (RCA-Jack) or PORT5 (Optical connector).
JP12
MCLK2 JP13 BICK2 JP14
LRCK2 JP15
SDTI

[AKD4688-A]
<KM109900> 2011/12
- 6 -
DIP Switch set up
[SW4] (4688 Mode): Mode settings of AK4688
No. Name OFF (“L”) ON (“H”) Default
1 I2C H/W Control I2C Control L
2 AIN1 L
3 AIN0 Analog Input Selector Control (I2C = “L” )
(Refer to Table 7) L
4 MSN ADC Slave Mode ADC Master Mode L
5 CAD0/CKS CAD Address pin Control (I2C = “H” )
ADC Master Clock Speed Control (I2C = “L” ) L
6 TEST1 For AK4688’s TEST MODE (Fixed to “L”) L
7 TEST2 XFor AK4688’s TEST MODE (Fixed to “L” ) L
Table 3. Mode settings of AK4688
AK4688
Register Settings AK4118A (U5) SW6 Settings
MSN pin DIF1 bit DIF1 DIF0 Audio I/F Format
L 0 L L 24bit, Left justified <Default>
L 1 L H 24bit, IP
2
PS
H 0 H L 24bit, Left justified
H 1 H H 24bit, IP
2
PS
Table 4. ADC Audio I/F Format Settings
AK4688
Register Settings AK4118A (U6) SW7 Settings
DIF21
bit DIF20 bit DIF2 DIF1 DIF0 Audio I/F Format
0 0 L L L 16bit, Right justified
0 1 L H H 24bit, Right justified
1 0 H L L 24bit, Left justified <Default>
1 1 H L H 24bit, I2S
Table 5. DAC Audio I/F Format Settings
No. OCKS1 OCKS0 MCKO1 X’tal fs (max)
0 L L 256fs 256fs 96kHz
1 L H 256fs 256fs 96kHz
2 H L 512fs 512fs 48kHz
3 H H 128fs 128fs 192kHz
Table 6. AK4118A Master Clock Speed Control
AIN1 pin AIN0 pin Input Selector
L L LIN1 / RIN1 <Default>
L H Reserved
H L Reserved
H H Reserved
Table 7. ADC Input Selector Control (H/W Control Mode)
CKS pin Master Clock Speed
L 256fs <Default>
H 768fs
Table 8. ADC Master Clock Speed Control (Master Mode, H/W Control Mode)

[AKD4688-A]
<KM109900> 2011/12
- 7 -
Other jumper pins set up
1. JP1 (GND)
OPEN : Analog ground and digital ground are separated.
SHORT : Analog ground and digital ground are shorted. <Default>
2. JP1 (SCL/AIN0)
SCL : Select I2C control mode.
AIN0 : Select H/W control mode. < Default >
3. JP2 (SDA/AIN1)
SDA : Select I2C control mode.
AIN1 : Select H/W control mode. < Default >
4. JP9 (TX)
BNC : Digital signals are output via the BNC connector. < Default >
OPT : Digital signals are output via the optical connector.
5. JP10 (RX)
BNC : Digital signals are output via the BNC connector. < Default >
OPT : Digital signals are output via the optical connector.
The function of the toggle SW
[SW1] (4688 PDN1) : Power down control for ADC of AK4688. Keep “H” during normal operation.
AK4688 should be reset once bringing SW1 “L”upon power-up.
[SW2] (4688 PDN2) : Power down control for DAC of AK4688. Keep “H” during normal operation.
AK4688 should be reset once bringing SW1 “L”upon power-up.
[SW3] (DIT PDN) : Power down control of U5 (AK4118A). Keep “H” during normal operation.
Keep “L” when AK4118A is not used.
[SW5] (DIR PDN) : Power down control of U6 (AK4118A). Keep “H” during normal operation.
Keep “L” when AK4118A is not used.

[AKD4688-A]
<KM109900> 2011/12
- 8 -
Serial Control
The AK4688 can be controlled via the printer port (parallel port) of IBM-AT compatible PC. Connect PORT1
(CTRL) with PC by 10 wire flat cable packed with the AKD4688-A
Connect
SDA(ACK)
SCL
SDA
10pin Header
10pin Connector
10 wire
flat Cable
PC AKD4687-A
2▲
10 9
PORT1
CTRL
Red
Figure 3. Connect of 10 wire flat cable

[AKD4688-A]
<KM109900> 2011/12
- 9 -
Analog Input/Output Circuits
(1) Input Circuits
J1
MR-552LS
2
3
1
J2
MR-552LS
2
3
1
AVSS1
LIN1
AVSS1
RIN1
LIN1 RIN1
Figure 4. Analog Input Circuit
(2) Output Circuits
AVSS2
AVSS2
R21
(OPEN)
R19
470
LOUT
AVSS2 AVSS2
LOUT
AVSS2
C12
2.2n
AVSS2
R22
(OPEN)
R20
470
ROUT
C14
2.2n
AVSS2
C11
(OPEN)
AVSS2
C13
(OPEN)
J7
MR-552LS
2
3
1
J8
MR-552LS
2
3
1
ROUT
Figure 5. Analog Output Circuit

[AKD4688-A]
<KM109900> 2011/12
- 10 -
Control Soft Manual
■Evaluation Board and Control Soft Settings
1.Set an evaluation board properly.
2.Connect the evaluation board to an IBM PC/AT compatible PC by a 10 wire flat cable. Be care of the direction of the
10pin header. Before running this control soft on Windows 2000/XP, the driver included in the CD must be installed.
Refer to the “Driver Control Install Manual for AKM Device Control Software” for installation of the driver. When
running this control soft on Windows 95/98/ME or via an AKDUSBIF-B interface board, driver installing is not
necessary.
3.Continue to evaluate by following steps.
■Operation Screen
1. Start up the control program, and the operation screen is shown below.