ROHM BU7831KN

TECHNICAL NOTE
Sound Path Selector LSI Series
Voice/Audio
Mixer & Selector
BU7831KN
●Description
BU7831KN is the sound path selector which include 3 stereo inputs, Stereo headphone amp, 600Ω driver amp, and
2stereooutputs. Each output have a mixer and an attenuator, you can set the variable audio path setting. The variable audio
source can connect to Headphone and speaker through this LSI.
●Feature
1)
2)
3)
4)
5)
6)
7)
8)
It has 3stereo inputs.
It has analog mixer on each input.
It matches for the application used the Headphone because it has 16Ω audio driver.
16Ω driver has the pop-noise less function.
The attenuator of 16Ω driver has soft changing and muting function.
It has 600Ω driver for external output.
It included stereo output for stereo speaker.
VQFN20 small package
●Applications
It is for portable equipments with audio player.
Apr. 2006
●Absolute maximum ratings
Parameter
Symbol
Supply voltage
VDD
Power dissipation
Pd
Operating temperature range
Topr
Storage temperature range
Tstg
*1 Reduce by 5.3 mW/ oC over 25 oC
Limits
-0.3～4.5
530 *1
-30～+85
-55～+125
Unit
V
mW
o
C
o
C
●Recommended operating range
Parameter
Supply voltage
Symbol
VDD
MIN
2.5
TYP
3.0
MAX
3.3
Unit
V
●Electric Characteristics
Unless otherwise specified,
•Analog Part
Parameter
o
Ta=25 C、AVDD=DVDD=3.0V
Symbol
MIN
TYP
MAX
Unit
Condition
Stand-by current
Operation current 1
Istb
Idd1
-
0.26
3
0.42
μA
mA
Operation current 2
Idd2
-
2.3
3.7
mA
THDhp1
-
0.05
0.5
%
Stand-by mode
BIAS part. No signal
ST1R, ST1L to HPR, HPL
Exclude Idd1, No signal
Vo=-10dBV, 20kHzL PF
PO1
-
10
-
mW
VNO
-
-94
-80
dBV
VOMAX1
2.0
-
-
Vp-p
VOMAX2
2.0
-
-
Vp-p
Symbol
MIN
TYP
MAX
Unit
Condition
VIL
VIH
IIN
2.1
-
-
0.7
±2
V
V
μA
0V, 3V force
Symbol
tcyc
tdh
tds
tcs
tch
MIN
250
50
50
50
50
TYP
-
MAX
-
Unit
ns
ns
ns
ns
ns
Total harmonic distortion 1
(HPL, HPR)
Output power 1(HPL, HPR)
Output Noise Voltage 1
(HPL, HPR)
Maximum output level 1
(SPL, SPR)
Maximum output level 2
(EXTO)
THD=10%, RL=16Ω
JIS A weighting
THD≦1%, RL=10kΩ
THD≦1%, RL=600Ω
•Digital input (DC)
Parameter
Input L level voltage
Input H level voltage
Input current
•CPU interface
Parameter
Cycle Time
Input Data Hold Time
Input Data Setup Time
Chip Select Setup Time
Chip Select Hold Time
2/16
Condition
●Reference Data (Unless otherwise specified, Ta=25 oC、AVDD=DVDD=3.0V)
0.8
0.6
0.4
0.2
CIRCUIT CURRENT : ICC(mA)
CIRCUIT CURRENT : ICC(mA)
STAND BY CURRENT : Ist(μA)
10
10
1.0
8
6
4
2
2.0
2.5
3.0
3.5
4.0
2.0
4.5
6
4
2
0
0
0.0
8
2.5
3.0
3.5
4.0
2.0
4.5
Fig.2 Operation current
At Headphone AMP part
Fig.1 Stand-by current
10.00
10.00
0.10
0.01
-100
-80
-60
-40
-20
EXTO : THD+N (%)
10.00
HPR : THD+N (%)
100.00
HPL : THD+N (%)
100.00
1.00
0.10
0.01
0
-100
INPUT LEVEL : VIN (dBV)
4.0
4.5
0.10
0.01
-80
-60
-40
-20
-100
0
-80
-60
-40
-20
0
INPUT LEVEL : VIN (dBV)
Fig.5 Total Harmonic
Distortion (HPR)
Fig.6 Total Harmonic
Distortion (EXTO)
100.00
100.00
3.5
1.00
INPUT LEVEL : VIN (dBV)
Fig.4 Total harmonic
Distortion (HPL)
3.0
Fig.3 Operation current
Of All blocks
100.00
1.00
2.5
SUPPLY VOLTAGE : VDD(V)
SUPPLY VOLTAGE : VDD(V)
SUPPLY VOLTAGE : VDD(V)
20
0
SPR : THD+N (%)
SPL : THD+N (%)
1.00
0.10
HPL : LINEARITY (dBV)
10.00
10.00
1.00
0.10
-20
-40
-60
-80
0.01
0.01
-100
-80
-60
-40
-20
-100
0
-60
-40
-20
-100
0
-100
INPUT LEVEL : VIN (dBV)
INPUT LEVEL : VIN (dBV)
0
0
0
-60
-80
SPL : LINEARITY (dBV)
20
EXTO : LINEARITY (dBV)
20
-40
-20
-40
-60
-80
-100
-80
-60
-40
-20
INPUT LEVEL : VIN (dBV)
Fig.10 Linearity (HPR)
0
-100
-40
-20
0
-20
-40
-60
-80
-100
-100
-60
Fig.9 Linearity (HPL)
20
-20
-80
INPUT LEVEL : VIN (dBV)
Fig.8 Total Harmonic
Distortion (SPR)
Fig.7 Total Harmonic
Distortion (SPL)
HPR : LINEARITY (dBV)
-80
-100
-80
-60
-40
-20
INPUT LEVEL : VIN (dBV)
Fig.11 Linearity (EXTO)
3/16
0
-100
-80
-60
-40
-20
INPUT LEVEL : VIN (dBV)
Fig.12 Linearity (SPL)
0
20
-70
-70
-75
-75
-80
-80
-85
-85
-40
-60
-80
Noise [dBV]
-20
Noise [dBV]
-90
-95
-100
-80
-60
-40
-20
-100
-105
-110
2.0
0
2.5
3.0
3.5
4.0
4.5
2.0
SUPLLY VOLTAGE : VDD(V)
INPUT LEVEL : VIN (dBV)
Fig.13 Linearity (SPR)
-70
-70
-75
-75
-75
-80
-80
-80
-85
-85
-85
-95
-90
-95
-100
-100
-105
-105
-110
-110
3.0
3.5
4.0
SUPLLY VOLTAGE : VDD(V)
Fig.16 Output Noise (EXTO)
4.5
2.0
4.0
4.5
-95
-105
2.5
3.5
-90
-100
2.0
3.0
Fig.15 Output Noise (HPR)
-70
-90
2.5
SUPPLY VOLTAGE : VDD(V)
Fig.14 Output Noise (HPL)
Noise [dBV]
Noise [dBV]
-95
-105
-110
-100
-90
-100
Noise [dBV]
SPR : LINEARITY (dBV)
0
-110
2.5
3.0
3.5
4.0
4.5
SUPLLY VOLTAGE : VDD(V)
Fig.17 Output Noise (SPL)
4/16
2.0
2.5
3.0
3.5
4.0
SUPLLY VOLTAGE : VDD(V)
Fig.18 Output Noise (SPR)
4.5
●Block Diagram, Recommended application circuit, Pin assign
2.5～3.3V
+
VDD
VSS
ST1L
Other Source
ATT1L
0～‐28ｄB
2ｄB step
ST1R
PCM CODEC
Stereo
Tuner
0～‐28ｄB
2ｄBstep
ATT1R
0～‐28ｄB
2ｄB step
ST2L
－
＋
ATT4L
MIXSEL1
MIXSEL2
－
＋
ATT4R
ATT2L
0/‐6ｄB
MIXSEL3
ST2R
－
＋
ATT5
0～‐28ｄB
2ｄBstep
ST3L
MIXSEL4
ATT6L
0～‐28ｄB
2ｄBstep
MIXSEL5
ATT6R
ATT3L
＋
－
0/‐6ｄB
ST3R
ATT3R
0/‐6ｄB
＋
－
EXTO
16Ω
+
100uF
Stereo
Head Phone
HPL
16Ω
100uF
+
HPR
0～‐28ｄB
2ｄBstep
Serial
BIAS
CVCOM
External
600Ω
0/‐6ｄB
Stereo
Speaker
Amp
SPR
0～‐28ｄB
2ｄBstep
ATT2R
Stereo
Melody
SPL
NRST SCLK SDATA NCS
+
4.7u
CSTART
CSTEP
1uF
1uF
RESET
CPU I/F
CPU
Fig.19 Application circuit example
VDD
15
VSS
14
HPR
13
CSTEP
12
CVCOM
11
HPL 16
10 ST3L
CSTART 17
9 ST3R
BU7831KN
EXTO 18
8 ST2L
SPR 19
7 ST2R
SPL 20
6 ST1L
1
2
3
4
5
SCLK
SDATA
NCS
NRST
ST1R
Fig.20 Pin Assign
5/16
●Input terminal equivalent circuit diagram
100kΩ(TYP)
PAD
PAD
A SCLK, SDATA, NCS, NRST
PAD
B CSTEP
PAD
C ST2R, ST2L, ST3R, ST3L
PAD
PAD
F CVCOM, CSTART
E VSS, VDD
D ST1R, ST1L
PAD
G HPR, HPL, EXTO, SPR,
SPL
About Digital input (Type A): When you will have possibility to give Hi-z for input pin,
You must select from the under heads for protect the pin floated.
a) Pull down with less than 10kohm
b) Pull up
c) Give “L” signal just before Hi-Z.
Fig.21 Equivalent circuit diagram
No.
Name
1
SCLK
2
Function
No.
Name
Serial clock input of CPU I/F
11
CVCOM
Reference voltage
SDATA
Serial data input of CPU I/F
12
CSTEP
Connect capacitor for blocking pop-noise
3
NCS
Chip select input of CPU I/F
13
HPR
Headphone R channel output
4
NRST
Reset input L=Reset
14
VSS
Ground
5
ST1R
Stereo 1 input for R channel
15
VDD
Power supply
6
ST1L
Stereo 1 input for L channel
16
HPL
Headphone L channel output
7
ST2R
Stereo 2 input for R channel
17
CSTART
8
ST2L
Stereo 2 input for L channel
18
EXTO
9
ST3R
Stereo 3 input for R channel
19
SPR
Speaker R channel output
10
ST3L
Stereo 3 input for L channel
20
SPL
Speaker L channel output
6/16
Function
Connect capacitor for blocking start up
pop-noise
600Ω driver output
●Detail explanation of each function blocks
・Reference Voltage (Bias part)
The reference voltage occurrence part that decides the operating point of a group of internal amplifiers is the following.
CVCOM_OUT, CSTART_OUT, all is about 1/2VDD[V], and therefore the level of internal signal becomes about 1/2VDD[V],
too. CVCOM has a pre-charge function, and it is possible to shorten of rising time of the bias in ON.
(As for the CVCOM, ON/OFF of the pre-charge function is possible with a register bit.)
CSTART terminal is used as a reference voltage of the output amplifier of the headphone, and it included pop sound low
stage function in headphone path ON/ OFF, too.
Capacitor value with the outside in the figure is recommended to make the PSRR character of both standard voltages the
same. Choose the thing whose character is good in Capacitor with the outside because it becomes the reference voltage of
the internal circuit.
Pre
charge
CVCOM
4.7μF
30k
CVCOM_OUT
30k
To the one except for the headphone
amplifier output step
Pre
charge
CSTART
1μF
140k
CSTART_OUT
140k
To the headphone amplifier output step
Fig.22 CVCOM, CSTRT equivalent circuit
・Analog input part
The following is about each analog. Input. Please use the coupling capacitor with the outside in consideration of frequency
characteristic of input. Input DC level is about 1/2VDD[V]. Input impedance on off (input non-choice) becomes Hi-z. When
an input terminal isn’t used (when an input path isn’t set up) is open, and there is no problem. But, be careful that noise
from the outside and so on doesn’t turn because it becomes Hi-z. When it is anxious, pull-down in about 100kΩ.
ST1L and ST1R inputs change input impedance by setting of ATT1L and ATT1R respectively.
ST1L(R) input impedance
ATT1 L (R) setting
200kΩ(TYP)
400kΩ(TYP)
0dB setting
Mute setting
7/16
200k
200k
ST1L
ST1R
CVC O M _O U T
100k
ST2L
ST2R
ST3L
ST3R
100k
100k
CVC O M _O U T
Fig.23 Input pins equivalent circui
・Analog output part
The following is about Analog output part (EXTO, SPL, SPR, HPL, HPR).
Each output amplifier is linked path select (MIXER1～5).
Because stereo output is presumed, HPL and HPR are turned ON/OFF at the same time, and with
pop sound decrease function.
MIXER1
At the time of path choice
SPL output amplifier ON
MIXER2
At the time of path choice
SPR output amplifier ON
MIXER3
At the time of path choice
EXTO output amplifier ON
MIXER4 or MIXER5
At the time of path choice
HPL, HPR output amplifier ON
Be careful that noise from the outside and so on doesn't turn because it becomes Hi-z though
the output that isn’t used is open and there is no problem.
When it is anxious, pull-down in about 100kΩ.
Output
Port
Output impedance (DC)
At ON
Output impedance (DC)
At OFF
EXTO
SPL
SPR
HPL
HPR
1.4Ω
Hi-z
2.2Ω
Hi-z
1.5Ω
0.6Ω
GND short
8/16
・Attenuator
Each attenuator has 16 steps (4bit), which contains mute. ATT6L and ATT6R that is attenuator of the headphone output
has soft mute that decreases pop sound in switching. (ATT1 - 5 don't have this function.)
The amount of software depends on a capacitor to connect to the CSTEP terminal. Decide the value of a capacitor to
connect to the CSTEP terminal after you take pop volume and delay time into consideration because a fixed number
becomes the bottom mostly at the time of that switching.
ATT setting
ATT
ATT
Mute
HP output
Thsmute
Thsmute
Thsmute=200×103×CSTEP [S]
Fig.24
・Analog path part
About the internal pass circuit, the circuit that it has a path setting by the register turns it on. For example, when
MIXSEL*_0 is chosen with either ATT, ST1R input is chosen, and a group of input amplifiers of ST1R turns it on. And a
connected output amplifier is turned on when either input is chosen with MIXSEL* in the same way to the output circuit.
・Pop sound decrease circuit at the time of head phone output ON/ OFF
It has the function that decreases pop sound that occurs at the time of ON/ OFF of the headphone output (HPL and HPR).
When headphone output is chosen/non-chosen, it is the function that the DC output of the headphone output goes down
smoothly on falling/rising. Rising time is decided by the capacitor value that it is connected to the CSTART terminal.
Falling time is decided by the CSTART terminal and the coupling capacitor. Pop sound decreases as much as to be here if
rising/falling is smooth. Decide the value of a capacitor to connect to the CSTART terminal after you take pop sound,
rising/falling time into consideration because a fixed number becomes the bottom mostly at the time of that switching.
And do settlement of timing in consideration of this time when you make it turn ON/OFF by the continuance.
Pop sound is made when it switches in the middle of the descent of rising/falling.
Headphone ON/OFF
Headphone Output
(DC)
Thpout
Thpout=80.6×103×CSTART[S]
Fig.25
9/16
・Digital part
Input such as clock, data is to input "H" or "L" properly about each digital input terminal to contain at the time of standing
by as well.
If you turn off the power (When Hi-z is input), a control side is to avoid an input terminal's becoming open in either
following method It has the possibility that penetration electric current occurs because it becomes the input which isn't
fixed as BU7831KN when it isn't avoided.
a） Terminal, in less than 10kΩ, pull-down
b） Terminal, pull-up
c）
When it becomes input Hi-z, "L" is given to it.
・CPU interface
NCS
tch
tcyc
tcs
SCLK
tds
SDATA
A7
tdh
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
Fig.26
th
SDATA will be confirmed by 16 clock that is inputted after NCS falling edge, and then serial data reflect to internal
register by NCS falling edge. The data format is 16bit rear.
CPU I/F is 1Byte=16bit. Because it doesn't cope with continuous data transmission, you must surely insert the section of
NCS= "H" between 1st Byte and 2nd Byte. The following the is to secure time beyond the SCLK 1 clock. （th≧tcyc）
th
NCS
SCL
SDATA
Fig.27
10/16
Using in the BU7831KN dedicated line is recommended with a CPU I/F.
Control it by a sequence like the bottom when you don't do special control.
NCS
CPU
SCLK
BU7831KN
SDATA
Other
NCS_OTH
IC
Fig.28
CPU I/F input signals waveforms
NCS
NCS_OTH
SCLK
SDATA
BU7831KN
Control
Other IC
Control
BU7831KN
Control
Fig.29
Please NCS of BU7831KN is set “H” when you control the other IC.
When NCS is "H", the register of BU7831KN can't write it.
note )
NCS_OTH is based on the specifications of other IC's.
11/16
●Recommended operation sequence
VDD ON
NRST＝L start. Rise up VDD first.
After the mode setting, input the audio signal.
VDD
NRST
Mode Set
CPU I/F
Analog Signal
Audio Signal
Fig. 30
VDD OFF
HPRST=0(82h=00h) is taken at the time of use of HPAMP first.
VDD OFF, after the mute on setting（88h=FFh）, NRST=L at using HPAMP.
VDD OFF, after NRST=L at not using HPAMP.
HPRST(82h)
01h
00h
ATT6L,R(88h)
XXh
FFh
NRST
VDD
Headphone output
Fig. 31
HPAMP ON
Mute OFF (HPRST 82h bit0), after the mode setting.
CPU I/F
Mode Set
Headphone output（DC）
HPRST (82h bit0)
Thpout
Thsmute
Fig. 32
12/16
・HPAMP OUTPUT rise time setting up expression
Thpout = 80.6 × 103 ×
CSTART [s] (typ)
・HSMUTE delay time setting up expression
Thsmute = 200 × 103 × CSTEP [s]
(typ)
HPAMP OFF
HPRST=0(82h bit0) is set up first.
Other setups are canceled after ATT6L, R is set up in the mute(88h=ffh).
HPRST (82h bit0)
ATT6L,R (88h bit7-0)
FFh
XXh
Path lifting
CPU I/F
Headphone output
Thsmute
Fig. 33
HPAMP Volume Control
As the mute time is set by capacitor connected CSTEP pin,
Volume control it is set after enough time.
The delay time is as same as Thsmute.
Volume
control bit
Headphone output
Thsmute
Thsmute
Fig. 34
13/16
Mode Setting Flow
Power Supply ON
Power Supply OFF
Stand-by mode
Reference Voltage ON
(VCOM＝1)
RESET
(NRST=0 or VCOM=0)
INPUT Path setting
MIXING Path setting
*１
Analog Power OFF
(PDN＝0)
Analog Power ON
(PDN＝1)
HPAMP MUTE ON
（Using HPAMP）
HPAMP RESET lifting
（Using HPAMP）
HPAMP RESET setting
（Using HPAMP）
OUTPUT
*1 : When the analog path setting is not changed. (Repeat output)
*2 : When the Power supply OFF, after output.
Fig. 35
14/16
*2
●Cautions on use
1) Absolute maximum ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating
conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a
short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings,
consider adding circuit protection devices, such as fuses.
2) Operating conditions
Characteristics are guaranteed under the conditions of each specified parameter.
3) Reverse polarity connection of the power supply
Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the
power supply lines. An external direction diode can be added.
4) Power supply line
Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise
ground and supply line, separate the ground section and supply lines of the digital and analog blocks.
Furthermore, for all power supply terminals to ICs, connect a capacitor between the power supply and the
GND terminal. When applying electrolytic capacitors in the circuit, note that capacitance characteristic
values are reduced at low temperatures.
5) GND voltage
GND potential should maintain at the minimum ground voltage level. Furthermore, no terminals should be
lower than the GND potential voltage including electric transients.
6) Short circuit between terminals and GND or other devices
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals to
GND, or other components on the circuits, can damage the IC.
7) Operation in a strong electromagnetic field
Using the ICs in a strong electromagnetic field can cause operation malfunction.
8) Inspection with set PCB
During testing, turn on or off the power before mounting or dismounting the board from the test board.
Do not power up the board without waiting for the output capacitors to discharge. The capacitors in the low
output impedance terminal can stress the device. Pay attention to the electro static voltages during IC
handling, transportation, and storage.
9) Input terminals
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The
operation of the parasitic element can cause interference with circuit operation, thus resulting in a
malfunction and breakdown of the input terminal. Therefore, pay thorough attention not to apply a
voltage lower than the GND to the input terminals. Furthermore, do not apply a voltage to the input
terminals when no power supply voltage is applied to the IC. In addition, even if the power supply
voltage is applied, apply a voltage lower than the power supply voltage to the input terminals, or a
voltage within the guaranteed value of electrical characteristics.
10) Ground wiring patterns
The power supply and ground lines must be as short and thick as possible to reduce line impedance.
Fluctuating voltage on the power ground line may damage the device.
11) External capacitor
When using external ceramic capacitors, consider degradation in the nominal capacitance value due to DC bias and
changes in the capacitance with temperature.
15/16
●Power Dissipation
700
600
Pd（W)
530mW
500
This value is the measurement value that was mounted on the PCB
400
by ROHM
300
Material :
200
Size:
Grass epoxy
70mmX70mmX1.6mm
100
0
0
25
50
75
100
125
150
Ta（℃）
Fig.36
●Ordering type name selection
B
U
ROHM type name
7
8
3
part number
1
K
N
package type name
KN=QFN
16/16
－
E
2
taping type name
E2 = embossed reel tape
Catalog NO.05T294Be '06.4 ROHM C
Appendix
Notes
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The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you
wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM
upon request.
Examples of application circuits, circuit constants and any other information contained herein illustrate the
standard usage and operations of the Products. The peripheral conditions must be taken into account
when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document. However, should
you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and examples
of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to
use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information.
The Products specified in this document are intended to be used with general-use electronic equipment
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The Products are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or
malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard against the
possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as
derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your
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The Products are not designed or manufactured to be used with any equipment, device or system
which requires an extremely high level of reliability the failure or malfunction of which may result in a direct
threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment,
aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear
no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may be controlled under
the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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Copyright © 2009 ROHM CO.,LTD.
THE AMERICAS / EUROPE / ASIA / JAPAN
Contact us : webmaster @ rohm.co. jp
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TEL : +81-75-311-2121
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Appendix-Rev4.0