AKM AK4621 User manual

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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
BNC
Figure 1. AKD4621-B Block Diagram
* Circuit diagram are attached at the end of this manual.
AK4621 Evaluation board Rev.3
AKD4621
-
B

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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.

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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
1
0
0
0
1
ON
ON
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).

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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
1
OFF
ON
OFF
ON
X'tal
DAUX
(Default)
Table 4. AK4114’S Clock Operation Mode
SW3-1
(XTL1)
SW3-2
(XTL0)
X’tal Frequency
ON
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
ON
Sharp Roll
-
off
(Default)
Table 6. Digital Filter Selection in parallel mode
b) Serial mode
SW1-2
(SDFIL)
SDAD
bit
Digital Filter
OFF
0
Sharp Roll
-
off
OFF
1
Short Delay
Table 7. Digital Filter Selection in serial mode

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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
Sp
eed
256fs
OFF
1
0
0
0
1
ON
ON
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).

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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
0
OFF
OFF
ON
OFF
PLL
RX
Table 11. Clock Operation Mode
SW3-1
(XTL1)
SW3-2
(XTL0)
X’tal Frequency
ON
ON
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
ON
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
0
0
Sharp
Roll
-
off
OFF
0
1
Slow Roll
-
off
OFF
1
0
Minimum Delay
Table 14. Digital Filter Selection in serial mode

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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.

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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
ed
256fs
OFF 0 0 0 0 1 ON OFF Normal
Speed
512fs
OFF 0 1 0 0 1 OFF OFF Double
Speed
256fs
OFF
1
0
0
0
1
ON
ON
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
0
OFF
OFF
ON
OFF
PLL
RX
Table 18. Clock Operation Mode (PLL)
SW3-1
(XTL1)
SW3-2
(XTL0)
X’tal Frequency
ON
ON
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
1
OFF
ON
OFF
ON
X
’
tal
DAUX
(Default)
Table 20. Clock Operation Mode (X’tal)
SW3-1
(XTL1)
SW3-2
(XTL0)
X’tal Frequency
ON
OFF
24.576MHz
(Default)
Table 21. Reference X’tal frequency (X’tal)

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3-4) Set up the digital filter
a) Parallel mode (Default)
SW1-2
(SDFIL)
Digital Filter
OFF
Short Delay
ON
Sharp Roll
-
off
(Default)
Table 22. Digital Filter Selection in parallel mode
b) Serial mode
SW1-2
(SDFIL)
SDAD
bit
Digital Filter
OFF
0
Sharp Roll
-
off
OFF
1
Short Delay
Table 23. Digital Filter Selection in serial mode

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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
-
5)
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
-
3)
MODE
OFF
ON (
4
4.1KHz)
ON
OFF
(Default)
Table 25. De-emphasis control (Parallel mode)
1-3) Parallel mode/ serial mode
P/S pin
(SW1
-
1)
MODE
OFF
Serial
ON
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
-
3)
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>