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ASAHI KASEI
[AKD4394]
AKD4394
Evaluation board Rev.C for AK4394
General Description The AKD4394 is an evaluation board for AK4394, which is 192kHz sampling 24Bit DAC. The AKD4394 includes a LPF which can add differential analog outputs from the AK4394 and also has a digital interface with AKM's wave generator using ROM data and AKM's ADC evaluation boards. Therefore, it is easy to evaluate the AK4394.
< Ordering Guide
AKD4394 Rev.C
--- Evaluation board Rev.C for AK4394: differential output Function
< On-board differential output buffer circuit < On-board clock generator < BNC connector for an external clock input < Compatible with 3types of interface 1. 2. 3. Direct interface with evaluation boards for AKM's A/D converter (AKD539X, AKD535X) Interface with a signal generator (AKD43XX) On-board CS8414 as DIR which accepts optical input.
O p tic a l In p u t
C S 8414 (DIR )
2nd Order LPF
10p in H e a d e r
R O M D a ta or A / in p u t D
A K 4394
Lch
E x tern a l C lo c k C lo c k G e n e rato r
Rch
Fig.1 Block diagram * Circuit diagram and PCB layout are attached at the end of this manual. (AKD4394 Rev.C is same as AKD4393 Rev.C.)

1
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ASAHI KASEI
[AKD4394]
The differential output circuit and LPF is implemented on board. The differential outputs of AK4394 is buffered by non-inverted circuit and output via Cannon connector(differential output). LPF adds differential outputs. NJM5534D is used for op-amp on this board that has low noise and high voltage torelance characteristics. Analog signal is output via Cannon and BNC connectors on the board. The output level is about 2.94Vrms(typ@VREF=5.0V) by Cannon and 2Vrms(typ@VREF=5.0V) by BNC.
+15 + 7 6 4 + -15
47u
AOUTL- +
10n 300 300 10n
3 2+ -
10u
0.1u 10u 100 430 4.7n
2 1
560
NJM5534D
0.1u
10u +
220 300
0.1u
3
620 430 620
4.7n NJM5534D
2 -4 3+7
100
6
Lch
+
47u
AOUTL+ +
10n 300 300 10n 300
3 + 27 6 4 +
10u
0.1u 0.1u 10u 0.1u
+
100
560
10u
NJM5534D
220
Fig.2 External Analog Filter
1. Set up the jumpers for power supply. [JP15(REG)] selects power supply for AVDD pin of AK4394. short: 5V is supplied from regulator. (default) Nothing should be connected to A5V jack. open: 5V is supplied from A5V. 2. Set up the power supply lines. +15V=15V, -15V=-15V: Power supply for op-amp. AVDD of AK4394 is supplied from "+15V" through regulator (JP15: short). A5V=5V: This jack is used when AVDD of AK4394 is supplied from this. In this case, JP15 should be open. DVDD=5V: Power supply for logic circuit on this board. VP=3V5.25V: Digital (set JP10 to VP), AGND=DGND=0V . Each supply line should be distributed from the power unit. 3. Set up the evaluation modes by jumper pins and DIP switches.(See next item.) 4. Power on.(The AK4394 should be reset once by bringing PD "L" upon power-up.) *SW1 resets the AK4394 during operation. The AK4394 is reset at SW1="L" and exits resetting at SW1="H".

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ASAHI KASEI
[AKD4394]
1. Evaluation Modes
*Applicable Evaluation Mode (1) DIR(Optical Link) (2) Ideal sine wave generated by ROM data (3) Using AD converted data (4)All interface signals including master clock are fed externally.
(1) DIR(Optical Link) (default) PORT2 is used for the evaluation using such as CD test disk. The DIR generates MCLK, BICK and LRCK SDATAfrom the received data through optical connector(PORT2: TORX176). JP4 JP5
VDD INV THR INV THR XTL/EXT DIR DIR XTL/EXT 2X 1X 1/2X 1X GND
JP1
JP2
JP6
JP7
JP8
JP14
DIR XTL EXT
JP9
XTL
CS8414
BCP
(MSB justified)
BCP
(others)
SD BI LR
CKDIV1
CKDIV2
CLK Fig.3 Jumper set-up (DIR)
(2) Ideal sine wave generated by ROM data Digital signal generated by AKD43XX are used. PORT1 is used for the interface with AKD43XX. Master clock is sent from AKD4394 to AKD43XX then LRCK, BICK and SDATA are sent from AKD43XX to AKD4394.
JP1 JP2
VDD GND
JP4
INV THR
JP5
XTL/ XT E D IR
JP6
D IR XTL/ XT E
JP7
JP8
2X 1X
J P 14
1/ 2X 1X D IR XTL EXT
JP9
XTL
C S 8414
BCP
BI
LR
SD
C K D IV 1
C K D IV 2
CLK
Fig.4 Jumper set-up (ROM data)

3
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ASAHI KASEI
[AKD4394]
(3) Using AD converted data AD converted data from AKM's AD evaluation boards(AKD539X, AKD535X) is used through PORT1. * In case of using external clock through a BNC connector, select EXT of JP9 and short JP1. * In case of using the double speed sampling mode, select 1/2X of JP8 and set S2-2(DFS) on.
JP1 JP2
VDD GND
JP4
INV THR
JP5
XTL/ XT E D IR
JP6
D IR XTL/ XT E
JP7
JP8
2X 1X
J P 14
1/ 2X 1X D IR XTL EXT
JP9
XTL
C S 8414
BCP
BI
LR
SD
C K D IV 1
C K D IV 2
CLK
Fig.5 Jumper set-up (A/D)
(4) All interface signals including master clock are fed externally. Under the following set-up, MCLK, LRCK and SCLK signals needed for the D/A to operate could be fed through PORT1.
JP1 JP2
VDD GND
JP4
INV THR
JP5
XTL/ XT E D IR
JP6
D IR XTL/ XT E
JP7
JP8
2X 1X
J P 14
1/ 2X 1X D IR XTL EXT
JP9
XTL
C S 8414
BCP
BI
LR
SD
C K D IV 1
C K D IV 2
CLK
Fig.6 Jumper set-up (ext.)
2. MCLK set-up When the LRCK is fed from the 74HC4040 on the board, The ratio of MCLK to LRCK can be selected by JP8 and JP14. JP14 1X 1X 1/2X 1/2X JP8 1X 2X 1X 2X X'tal 12.288MHz 24.576MHz 24.576MHz 49.152MHz MCLK 12.288MHz 24.576MHz 12.288MHz 12.288MHz fs 48kHz 48kHz 96kHz 96kHz MCLK/LRCK 256 512 128 128
Table.1 set-up example
3. BICK set-up When BICK is supplied from U1(74HC4040), either 32fs or 64fs could be selected. Fig.8 shows 64fs mode. 64fs mode is recommended. *Only mode 0(LSB justified 16bit mode) can correspond to 32fs.
JP3 64 32 BCS
Fig.7 Jumper Set-up (BCS)

4
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ASAHI KASEI
[AKD4394]
4. DIP switch set-up Confirm the set-up of the DIP switch before the operation. "ON" means "H" and "OFF" means "L". 4-1. Set-up of SW3, SW4(Mode set-up of AK4394: see the data sheet of AK4394) DIF2 OFF OFF OFF OFF ON DIF1 OFF OFF ON ON OFF BICK 32fs 40fs 48fs 48fs (default) 48fs Table 2 Audio Serial Interface Format Select Pins (SW3-5,6,7) DIF0 OFF ON OFF ON OFF Mode 0: LSB justified, 16bit 1: LSB justified, 20bit 2: LSB justified, 24bit 3: I2S 4: MSB justified, 24bit
4-2. Set-up of SW6 (Mode set-up of CS8414. About details, see the data-sheet of CS8414) Adjust the audio data format of CS8414 (DIR) to AK4394. CS8414 does not match the LSB justified 20bit/24bit mode of AK4394. M3 M2 M1 M0 Data format (SW6-2) (SW6-3) (SW6-4) (SW6-5) OFF OFF OFF OFF MSB justified, 24bit OFF OFF ON OFF I2S OFF ON OFF ON LSB justified, 16bit Table 3 Set-up of SW6 SW6-1(SEL) :Usually ON. SW6-6(CS12): Select the channel for indicating the channel status. ON: Rch (default), OFF: Lch 5. Parallel/Serial Control SW5: set up P/S pin of AK4394. H: parallel mode. PORT3 is used JP11, 12 and 13 should be open. L: serial mode. PORT3 is used. JP11, 12 and 13 should be open. 6. Other set-up SW1: Reset of AK4394. Select "H" during operation. SW2: Soft-mute of AK4394. The soft-mute is executed during SW2 pushed. LE1 : This LED shows pre-emphasis status. It turns on when the data is pre-emphasized. LE2 : This LED shows the output of VERF pin in CS8414. It turns on when the error is occured in CS8414. JP4 INV THR THR
(default)

5
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ASAHI KASEI
[AKD4394]
< AK4394 Measurement Example
Conditions: AVDD =DVDD= 5.0V Interface = DIR (44.1kHz, 96kHz) MCLK = 256fs(fs=44.1kHz, 96kHz) BICK = 64fs fs = 44.1kHz, 96kHz, Input data = 24bit Measurement unit: Audio Precision System Two Cascade (fs=44.1kHz, 96kHz) (AKD4394 Rev.C: differential output) fs Result 44.1kHz THD+N 100.3 20kLPF DR 120.1 22kLPF + A-weighted S/N 120.2 22kLPF + A-weighted 96kHz THD+N 99.6 40kLPF DR 119.2 80kLPF + A-weighted S/N 119.8 80kLPF + A-weighted Plot: FFT Point: 16384 Window: Equiripple Averages: 4

6
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ASAHI KASEI
[AKD4394]
(fs=44.1kHz)
AKM
+0 -10 -20 -30 -40 -50 -60 d B r A -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 20
AK4394 FFT(Input Level=0dBFS,fin=1kHz)
50
100
200
500 Hz
1k
2k
5k
10k
20k
FFT (Input Level=0dBFS, fin=1kHz)
AKM
+0 -10 -20 -30 -40 -50 -60 d B r A -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 20
AK4394 FFT(Input Level=-60dBFS,fin=1kHz)
50
100
200
500 Hz
1k
2k
5k
10k
20k
FFT (Input Level=-60dBFS, fin=1kHz)

7
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ASAHI KASEI
[AKD4394]
(fs=44.1kHz)
AKM
+0 -10 -20 -30 -40 -50 -60 d B r A -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 20
AK4394 FFT(Input="0"data)
50
100
200
500 Hz
1k
2k
5k
10k
20k
FFT (noise floor)
AKM
+0 -10 -20 -30 -40 -50 -60 d B r A -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 90 200 500 1k 2k Hz 5k 10k 20k 50k 100k
AK4394 FFT(Input = "0"data, out-of band)
FFT (noise floor, out-of band)

8
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ASAHI KASEI
[AKD4394]
(fs=44.1kHz)
AKM
-90 -92 -94 -96 -98 -100 -102 d B r A -108 -110 -112 -114 -116 -118 -120 -140 -104 -106
AK4394 THD + N vs Amplitud e (fin=1kHz)
-130
-120
-110
-100
-90
-80
-70 dBFS
-60
-50
-40
-30
-20
-10
+0
THD + N vs Amplitude (fin=1kHz)
AKM
-80 -82 -84 -86 -88 -90 -92 d B r A -98 -100 -102 -104 -106 -108 -110 20 -94 -96
AK4394 THD + N vs Input Frequency(Input Level=0dBFS)
50
100
200
500 Hz
1k
2k
5k
10k
20k
THD +N vs Input Frequency (Input Level=0dBFS)

9
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ASAHI KASEI
[AKD4394]
(fs=44.1kHz)
AKM
+0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -140
AK4394 Linearity
d B r A
-130
-120
-110
-100
-90
-80
-70 dBFS
-60
-50
-40
-30
-20
-10
+0
Linearity (fin=1kHz)
AKM
+1 +0.9 +0.8 +0.7 +0.6 +0.5 +0.4 +0.3 +0.2 d B r A +0.1 +0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 20
AK4394 F requency Response
50
100
200
500 Hz
1k
2k
5k
10k
20k
Frequency Response (Input Level=0dBFS)

10
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ASAHI KASEI
[AKD4394]
(fs=44.1kHz)
AKM
-100 -102 -104 -106 -108 -110 -112 -114 -116 d B r A -118 -120 -122 -124 -126 -128 -130 -132 -134 -136 -138 -140 20
AK4394 Crosstalk
50
100
200
500 Hz
1k
2k
5k
10k
20k
Crosstalk (upper = Rch, Lower = Lch)

11
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ASAHI KASEI
[AKD4394]
(fs=96kHz)
AKM
+0 -10 -20 -30 -40 -50 -60 d B r A -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 40
AK4394 FFT (Input Leve=0dBFS, fin=1kHz, Notch)
50
100
200
500
1k Hz
2k
5k
10k
20k
40k
FFT (Input Level=0dBFS, fin=1kHz, notch)
AKM
+0 -10 -20 -30 -40 -50 -60 d B r A -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 40
AK4394 FFT (Input Leve=-60dBFS, fin=1kHz)
50
100
200
500
1k Hz
2k
5k
10k
20k
40k
FFT (Input Level=-60dBFS, fin=1kHz)

12
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ASAHI KASEI
[AKD4394]
(fs=96kHz)
AKM
+0 -10 -20 -30 -40 -50 -60 d B r A -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 40
AK4394 FFT (Input = "0"data)
50
100
200
500
1k Hz
2k
5k
10k
20k
40k
FFT (noise floor)
AKM
-90 -92 -94 -96 -98 -100 -102 d B r A -108 -110 -112 -114 -116 -118 -120 -140 -104 -106
AK4394 THD + N vs Amplitud e (fin=1kHz)
-130
-120
-110
-100
-90
-80
-70 dBFS
-60
-50
-40
-30
-20
-10
+0
THD + N vs Amplitude (fin=1kHz)

13
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ASAHI KASEI
[AKD4394]
(fs=96kHz)
AKM
-80 -82 -84 -86 -88 -90 -92 d B r A -98 -100 -102 -104 -106 -108 -110 40 -94 -96
AK4394 THD + N vs Input Frequency(Input Level=0dBFS)
50
100
200
500
1k Hz
2k
5k
10k
20k
40k
THD + N vs Input Frequency (Input Level=0dBFS)
AKM
+0 -10 -20 -30 -40 -50 d B r A -60 -70 -80 -90 -100 -110 -120 -130 -140 -140
AK4394 Linearity
-130
-120
-110
-100
-90
-80
-70 dBFS
-60
-50
-40
-30
-20
-10
+0
Linearity (fin=1kHz)

14
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ASAHI KASEI
[AKD4394]
(fs=96kHz)
AKM
+1 +0.9 +0.8 +0.7 +0.6 +0.5 +0.4 +0.3 +0.2 d B r A +0.1 +0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 40
AK4394 F requency Response
50
100
200
500
1k Hz
2k
5k
10k
20k
40k
Frequency Response (Input Level=0dBFS)
AKM
-50 -55 -60 -65 -70 -75 -80 -85 d B r A -90 -95 -100 -105 -110 -115 -120 -125 -130 -135 -140 40
AK4394 Crosstalk
50
100
200
500
1k Hz
2k
5k
10k
20k
40k
Crosstalk (upper = Rch, Lower = Lch)

15
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ASAHI KASEI
[AKD4394]
IMPORTANT NOTICE * These products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current status. * AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. * Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. * AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representative Director of AKM. As used here: (a) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b) A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. * It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification.

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