ASAHI KASEI
[AKD4620B-B]
AKD4620B-B
AK4620B Evaluation board Rev.1
GENERAL DESCRIPTION
The AKD4620B-B is an evaluation board for the AK4620B, the 24Bit A/D & D/A converter. The
AKD4620B-B can evaluate A/D converter and D/A converter separately in addition to loopback mode
(A/D→D/A). The AKD4620B-B also has the digital audio interface and can achieve the interface with
digital audio systems via opt-connector.
Ordering guide
AKD4620B-B
--- Evaluation board for AK4620B
(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
-15V +15V
Regulator
AGND DGND
BNC
LIN
RIN
Input
Buffer
AK4114
(DIR&DIT)
Opt In
AK4620B
Output
Buffer
Opt Out
BNC
LOUT
ROUT
10pin Header
Control Data
Figure 1. AKD4620B-B Block Diagram
* Circuit diagram are attached at the end of this manual.
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ASAHI KASEI
[AKD4620B-B]
Evaluation Board Manual
Operation sequence
1) Set up the power supply line
[+15V]
(green)
= +15V
[-15V]
(blue)
= -15V
[GND]
(black)
= 0V
Note:
Each supply line should be distributed from the power supply unit.
2) Set up the evaluation modes, jumper pins and DIP switch. (See the followings.)
3) Power on
The AK4620B should be reset once bringing SW2 (PDN) “L” upon power-up.
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[AKD4620B-B]
Evaluation modes
Applicable evaluation modes
(1) Loopback mode (Default)
(2) Evaluation of DAC
(3) Evaluation of ADC
1) Loopback mode (Default)
1-1) Analog input mode
Jumper
Single-ended
Differential
JP3
(LIN)
SINGLE
DIFF
JP4
(AINL)
SINGLE
JP5
(RIN)
SINGLE
JP6
(AINR)
SINGLE
SW1-2
(ADMODE)
OFF
ON
(Default)
DIFF
DIFF
DIFF
Table 1. Analog Input Mode
* As for analog input circuit, please see the following item “Analog
Input Buffer Circuit”.
1-2) Sampling speed & MCLK frequency
a) parallel mode
SW1-1
(P/S)
ON
ON
SW1-4
(DFS0)
Sampling
MCLK
Speed of
Frequency of
AK4620B
AK4620B
Normal
OFF
OFF
ON
ON
OFF
512fs
Speed
Double
ON
OFF
ON
OFF
OFF
256fs
Speed
Table 2. Sampling Speed & Master clock Frequency in parallel mode
SW1-6
(CKS1)
SW1-7
(CKS0)
SW3-4
(OCKS1)
SW3-5
(OCKS0)
(Default)
*
Parallel mode does not support quad speed mode.
b) serial mode
SW1
(P/S)
OFF
OFF
OFF
DFS1
bit
0
0
1
DFS0
bit
0
1
0
Sampling
Speed of
AK4620B
Normal
0
0
1
ON
OFF
Speed
Double
0
0
1
OFF
OFF
Speed
0
0
1
ON
ON
Quad Speed
Table 3. Sampling Speed & Master clock Frequency in serial mode
CMODE
bit
CKS1
bit
CKS0
bit
SW3-4
(OCKS1)
SW3-5
(OCKS0)
MCLK
Frequency of
AK4620B
512fs
256fs
128fs
* 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 AK4620B should be set via the printer port (PORT3).
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ASAHI KASEI
[AKD4620B-B]
1-3) AK4114’s master clock mode & reference X’tal frequency
SW3-6
(CM1)
OFF
SW3-7
(CM0)
ON
Mode
1
PLL
X'tal
Clock source
SDTO
(Default)
OFF
ON
X'tal
DAUX
Table 4. AK4114’S Clock Operation Mode
SW3-1
(XTL1)
ON
SW3-2
(XTL0)
OFF
X’tal Frequency
24.576MHz
Table 5. Reference X’tal frequency
(Default)
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="OPT")
Jumper
Normal & Double Speed
Quard Speed
Table 6. DIR Input Interface
2-2) Sampling speed & MCLK frequency
a) parallel mode
SW1-1
(P/S)
ON
ON
ON
SW1-4
(DFS0)
OFF
OFF
ON
SW1-6
(CKS1)
OFF
OFF
OFF
Table 7.
Sampling
MCLK
Speed of
Frequency of
AK4620B
AK4620B
Normal
OFF
OFF
OFF
256fs
Speed
Normal
ON
ON
OFF
512fs
Speed
Double
ON
OFF
OFF
256fs
Speed
Sampling Speed & Master clock Frequency in parallel mode
SW1-7
(CKS0)
SW3-4
(OCKS1)
SW3-5
(OCKS0)
JP2
(RX3)
OPT or BNC
BNC
*
Parallel mode does not support quad speed mode.
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ASAHI KASEI
[AKD4620B-B]
b) serial mode
SW1-1
(P/S)
OFF
OFF
OFF
OFF
DFS1
bit
0
0
0
1
DFS0
bit
Sampling
Speed of
AK4620B
Normal
0
0
0
0
OFF
OFF
Speed
Normal
0
0
0
1
ON
OFF
Speed
Double
1
0
0
1
OFF
OFF
Speed
0
0
0
1
ON
ON
Quad Speed
Table 8. Sampling Speed & Master clock Frequency in serial mode
CMODE
bit
CKS1
bit
CKS0
bit
SW3-4
(OCKS1)
SW3-5
(OCKS0)
MCLK
Frequency of
AK4620B
256fs
512fs
256fs
128fs
* 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 AK4620B should be set via the printer port (PORT3).
2-3) AK4114’s master clock mode & reference X’tal frequency
SW3-6
(CM1)
OFF
SW3-7
PLL
X'tal
Clock source
(CM0)
OFF
ON
OFF
PLL
Table 9. Clock Operation Mode
SW3-2
X’tal Frequency
(XTL0)
ON
OFF
Table 10. Reference X’tal frequency
Mode
0
SDTO
RX
SW3-1
(XTL1)
ON
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