bd34704ks2 e

Datasheet
Sound Processors for Home Theater Systems
7.1ch Sound Processor for High-Quality Audio
with Built-in Micro-step Volume
BD34704KS2
Key Specifications
General description
The BD34704KS2 is an 8ch independent volume system
realized high-quality sound by improved specification of
op-amp and optimized layout of the element.The system
is designed to allow 7.1ch surround system application.
Micro-step volume can reduce the switching pop noise
during volume attenuation, so a high quality audio
system could be achieved.
This IC is available 12ch single-end input selectors to
maximum 3 zones. And also available 2 system multi
input selector.






Total harmonic distortion:
Maximum output voltage:
Output noise voltage:
Residual output noise voltage:
Cross-talk between channels:
Cross-talk between selectors:
Package
SQFP-T80C
0.0004%(Typ)
4.2Vrms(Typ)
1.2μVrms(Typ)
1.0μVrms(Typ)
-105dB(Typ)
-105dB(Typ)
W(Typ) x D(Typ) x H(Max)
16.00mm x 16.00mm x 1.60mm
Features
 12ch input selectors
(It is extendable to up to 18 in case of no use other
functions such as Multi input, REC output and SUB
output)
 Micro-step volume can reduce the switching pop
noise during volume attenuation
 Zone 3 is supported
 2ch sub-volume for zone output that is available for
independent control with a micro step function
 2-wire serial bus control, corresponding to 3.3/5V
SQFP-T80C
Applications
 Suitable for the AV receivers, home theater systems,
etc
Typical Application Circuit
Figure 1. Application Circuit
○Product structure：Silicon monolithic integrated circuit
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58 INL1
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47 INR6
46 INL7
45 INR7
44 INL8
43 INR8
42 INL9
41 INR9
OUTSL 15
OUTSR 16
OUTSBL 17
OUTSBR 18
OUTPL 19
OUTPR 20
48 INL6
50 INL5
49 INR5
52 INL4
51 INR4
53 INR3
55 INR2
54 INL3
56 INL2
OUTC 14
N.C. 13
OUTSW 12
N.C. 11
OUTFR 10
N.C. 9
OUTFL 8
VEE2 7
N.C. 6
VEE1 5
57 INR1
59 GND
CL 2
VCC 3
DGND 4
60 SBRIN
DA 1
BD34704KS2
Datasheet
Pin Configuration
Figure 2. Pin Configuration
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
Description of terminal
Terminal
Number
Symbol
Data and latch input terminal
41
INR9(SBRIN2)
Rch input terminal 9
Clock input terminal
42
INL9(SBLIN2)
Lch input terminal 9
Positive power supply terminal
43
INR8
Rch input terminal 8
DGND
Digital ground terminal
44
INL8
Lch input terminal 8
5
VEE1
Negative power supply terminal 1
45
INR7
Rch input terminal 7
6
N.C.
No connect
46
INL7
Lch input terminal 7
7
VEE2
Negative power supply terminal 2
47
INR6
Rch input terminal 6
8
OUTFL
FLch Output terminal
48
INL6
Lch input terminal 6
9
N.C.
No connect
49
INR5
Rch input terminal 5
10
OUTFR
FRch Output terminal
50
INL5
Lch input terminal 5
11
N.C.
No connect
51
INR4
Rch input terminal 4
12
OUTSW
SWch Output terminal
52
INL4
Lch input terminal 4
13
N.C.
No connect
53
INR3
Rch input terminal 3
14
OUTC
Cch Output terminal
54
INL3
Lch input terminal 3
15
OUTSL
SLch Output terminal
55
INR2
Rch input terminal 2
16
OUTSR
SRch Output terminal
56
INL2
Lch input terminal 2
17
OUTSBL
SBLch Output terminal
57
INR1
Rch input terminal 1
18
OUTSBR
SBRch Output terminal
58
INL1
Lch input terminal 1
19
OUTPL
Lch PRE Output terminal
59
GND
Analog ground terminal
20
OUTPR
Rch PRE Output terminal
60
SBRIN
SBRch DSP input terminal
21
GND
Analog ground terminal
61
SBLIN
SBLch DSP input terminal
22
GND
Analog ground terminal
62
SRIN
SRch DSP input terminal
23
GND
Analog ground terminal
63
SLIN
SLch DSP input terminal
24
GND
Analog ground terminal
64
CIN
Cch DSP input terminal
25
GND
Analog ground terminal
65
SWIN
SWch DSP input terminal
26
GND
Analog ground terminal
66
FRIN
FRch DSP input terminal
27
GND
Analog ground terminal
67
FLIN
FLch DSP input terminal
28
SUBR
Rch SUB Output terminal
68
FRIN3
FRch DSP input terminal 3
29
SUBL
Lch SUB Output terminal
69
FLIN3
FLch DSP input terminal 3
30
RECR
Rch REC Output terminal
70
GND
Analog ground terminal
31
RECL
Lch REC Output terminal
71
ADCR
Rch ADC Output terminal
32
GND
Analog ground terminal
72
ADCL
Lch ADC Output terminal
33
INR12(FRIN2)
Rch input terminal 12
73
GND
Analog ground terminal
34
INL12(FLIN2)
Lch input terminal 12
74
GND
Analog ground terminal
35
INR11(CIN2)
Rch input terminal 11
75
GND
Analog ground terminal
36
INL11(SWIN2)
Lch input terminal 11
76
GND
Analog ground terminal
37
INR10(SRIN)
Rch input terminal 10
77
GND
Analog ground terminal
38
INL10(SLIN2)
Lch input terminal 10
78
GND
Analog ground terminal
39
GND
Analog ground terminal
79
GND
Analog ground terminal
40
N.C.
No connect
80
CHIP
Chip select terminal
Terminal
Number
Symbol
1
DA
2
CL
3
VCC
4
Function
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Function
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
Block Diagram
Figure 3. Block Diagram
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Datasheet
BD34704KS2
Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Positive power supply
VCC
+7.75
(Note1)
V
Negative power supply
VEE
-7.75
(Note1)
V
Power dissipation
Pd
1.75
(Note2)
W
Input voltage
Vin
Operating temperature
Topr
Storage temperature
Tastg
(Note1)
(Note2)
(Note3)
Caution:
VEE-0.2 ~ VCC+0.2
-40 ~ +85
(Note3)
-55 ~ +150
V
°C
°C
The maximum voltage that can be applied based on GND.
Derating at 14.0mW/°C for operating above Ta≥25°C (mounted on 70×70×1.6mm ROHM standard board)
If it is within the operating voltage range, circuit functions and operation are guaranteed within this
operating temperature.
Operating the IC over the absolute maximum ratings may damage the IC. The damage can
either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore,
it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated
over the absolute maximum ratings.
Operating Condition
Item
Symbol
Rating
Positive power supply
VCC
+6.5 ~ +7.5
Negative power supply
VEE
-6.5 ~ -7.5
(Note4)
(Note5)
Unit
(Note4,5)
(Note4,5)
V
V
Applying voltage based on GND.
Within the operating temperature range, basic circuit function and operation are guaranteed within this operation
voltage range. But please confirm the setting of the constants, temperature, etc. Please take note that
electrical characteristics other than defined values cannot be guaranteed, however original function will retain.
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Datasheet
BD34704KS2
Electrical characteristic
Unless otherwise specified, Ta=25°C, VCC=7V, VEE=-7V, f=1kHz, Vin=1Vrms, RL=10kΩ,
Stereo input selector(MAIN, SUB1, SUB2)=IN1, Mode selector(FL, FRch)=MAIN,
Mode selector(SW, C, SL, SRch)=MULTI, Mode selector(SBL, SBRch)=MULTI, SB OUTSEL=SB,
Input Att=0dB, Input gain=0dB, Volume=0dB.
Item
TOTAL
Symbol
Limit
Min
Typ
Max
Unit
Conditions
Positive circuit current
Iqp
-
32
45
mA
No signal
Negative circuit current
Iqn
-45
-32
-
mA
No signal
Output voltage gain
Gv
-1.5
0
1.5
dB
Channel balance
CB
-0.5
0
0.5
dB
Total harmonic distortion
+ Noise
THD
-
0.0004
0.02
%
Maximum output voltage
Vom
3.8
4.2
-
Vrms
Output noise voltage *
Vno
-
1.2
10
µVrms
Residual output noise
voltage *
Vnor
-
1
8
µVrms
Cross-talk between
channels *
CT
-
-105
-80
dB
Cross-talk between
selectors *
CS
-
-105
-80
dB
Input impedance
Rin
70
100
130
kΩ
8, 10, 12, 14~18 pin
output
C Channel reference,
8, 10, 12, 14~18 pin
output
BW=400~30kHz
8, 10, 12, 14~18 pin
output
THD=1%,
VOLUME=+10dB
8, 10, 12, 14~18 pin
output
Rg=0Ω, BW=IHF-A
8, 10, 12, 14~18 pin
output
Volume=Mute,
Rg=0Ω, BW=IHF-A
8, 10, 12, 14~18 pin
output
Rg=0Ω, BW=IHF-A
8, 10 pin output
Rg=0Ω, BW=IHF-A
8, 10, 12, 14~18 pin
output
28~31, 33~38, 41~58
60~69 pin input
VOLUME
Maximum attenuation *
ATTmax
-
-115
-100
dB
Volume=Mute, BW=IHF-A
REC
OUT
Total harmonic distortion
THDR
-
0.0005
0.02
%
BW=400~30kHz,
RL=6.8kΩ
28~31 pin output
PRE
OUT
Output impedance
Ron
520
800
1080
Ω
19, 20 pin output
※VP-9690(Average value detection, effective value display) filter by Panasonic is used for * measurement.
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Datasheet
BD34704KS2
Typical Performance Curve(s)
50
40
20
Volume Gain[dB]
Consumption Current[mA]
30
10
0
Operational
range
-10
-20
-30
-40
-50
0
1
2
3
4
5
6
7
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-2
10
8
100
1000
10000
100000
VCC(+)/VEE(-)[V]
Frequency[Hz]
Figure 5. Volume Gain vs. Input Frequency
(32dB to 0 dB setting)
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
-34
Volume Gain[dB]
Volume Gain[dB]
Figure 4. Circuit Currents vs. Circuit Voltage
10
100
1000
10000
100000
10
100
1000
10000
100000
Frequency[Hz]
Frequency[Hz]
Figure 6. Volume Gain vs. Input Frequency
(0dB to -32 dB setting)
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-30
-32
-34
-36
-38
-40
-42
-44
-46
-48
-50
-52
-54
-56
-58
-60
-62
-64
-66
Figure 7. Volume Gain vs. Input Frequency
(-32dB to -64 dB setting)
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Datasheet
-60
-62
-64
-66
-68
-70
-72
-74
-76
-78
-80
-82
-84
-86
-88
-90
-92
-94
-96
-98
1.0000
0.1000
10kHz
100Hz
THD+N[%]
Volume Gain[dB]
BD34704KS2
1 kHz
0.0100
0.0010
10
100
1000
10000
0.0001
0.001
100000
Frequency[Hz]
0.010
0.100
1.00 0
10.000
Input Voltage[Vrms]
Figure 8. Volume Gain vs. Input Frequency
(-64dB to -95 dB setting)
Figure 9. THD + N vs. Input Voltage
(Note) The measurement results of Figure 4 to Figure 8 used by 80kHz LPF.
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Datasheet
BD34704KS2
Specifications for Control Signal
(4) Timing of control signal
Data is read at the rising edge of clock.
Latch is read at the falling edge of clock. Data on the latest 16bit is taken inside the IC.
Ensure to set DA and CL to LOW after Latch.
1byte=16bit
CL
( CLOCK）
tsu
90%
90%
twc
10%
thd
DA
DATA
LATCH
90%
twd
ts
90%
DATA
th
90%
10%
10%
tsd
thd
tsl
90%
twh
10%
90%
twc
90%
DATA
10%
thl
10%
90%
twl
LATCH
Figure 10. The timing definition of the control signal
Item
Symbol
Clock width
Data width
Latch width
Low hold width
Data setup time (DATA→CLK)
Data hold time (CLK→DATA)
Latch setup time (CLK→LATCH)
Latch hold time (DATA→LATCH)
Latch Low setup time
Latch Low hold time
twc
twd
twl
twh
tsd
thd
tsl
thl
ts
th
Limit
Typ
-
Min
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
Max
-
Unit
µsec
µsec
µsec
µsec
µsec
µsec
µsec
µsec
µsec
µsec
(2) Voltage of control signal (CL, DA, CHIP)
Limit
Item
High input voltage
Low input voltage
(3) Basic Structure of Control Data
←Input Direction
D15 D14 D13 D12 D11
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Conditions
VCC=+6.5 to +7.5V
VEE=-6.5 to -7.5V
D10
D9
Data
D8
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D7
Min
Typ
Max
(<VCC)
Unit
2.3
-
5.5
V
0
-
1.0
V
D6
D5
D4
D3
D2
D1
D0
Select Address
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
(4) Table of Control Data
←Input Direction
Select
Address D15 D14
No.
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
0
0
SUB
ON/OFF
1
0
0
Input Selector (MAIN)
REC
ON/OFF
1
Input Selector (SUB1)
0
2
Mode Select
FL, FRch
3
Volume channel
Select
4
PREOUT SEL
6
Mode Select
REC
Mode Select
C, SWch
MSEL
FRONT
Mode Select
SBL, SBRch
0
ADC ATT
Volume＋※Sub Volume
MSEL
C,SW
Mode Select
SUB
MSEL
SUR
MSEL
SB
SUB
SURB OUTSEL MUTE
0
D1
D0
0
0
0
0
0
1
0
1
0
1
1
0
Chip
Select
0
0
0
Volume
Select2
1
0
0
0
0
0
0
0
0
1
1
0
Base
Clock
0
0
System
Reset
0
0
1
1
1
0
B→A
switch-time
A→B
switch-time
7
Mode Select
SL, SRch
Input Selector (SUB2)
D2
BD3843FS (6ch Selector IC)
*
1
0
0
BD3841FS (9ch Selector IC)
*
1
0
1
BD3812F (2ch volume IC)
*
1
1
*
・Serial control lines can be shared with BD3471KS2, BD3473KS2 and BD3474KS2.
(In case using the serial bus commonly, please set chip select in “1”)
・Serial control lines can be shared with BD3843FS(6ch selector IC), BD3841FS(9ch selector IC) and
BD3812F(2chvolume IC).
・Initialize all data at every turning on the power supply.
※The Sub Volume is available by L/Rch independence and 0.5dB step.
The Sub volume attenuation is set by address No.3.（A combination of “Volume select2” and “Volume channel select”,
please determine the volume setting channel）
(例)
← Input direction
Address
No.0
L
Address
No.1
L
Address
No.2
L
Address
No.3
FRch
L
Address
No.3
FLch
L
Address
No.3
SBRch
L
Address
No.3
SBLch
L
・At the second time after turning on the power supply, eight any data to be changed.
(5) Chip Select Setting Table
CHIP terminal condition
D2
0 (LOW)
0
1 (HIGH)
1
BD34704KS2 can be operated in combination with another by setting the CHP terminal.
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Datasheet
BD34704KS2
IN1
0
0
0
0
1
IN2
0
0
0
1
0
IN3
0
0
0
1
1
IN4
0
0
1
0
0
IN5
0
0
1
0
1
IN6
0
0
1
1
0
IN7
0
0
1
1
1
IN8
0
1
0
0
0
IN9
0
1
0
0
1
IN10
0
1
0
1
0
IN11
0
1
0
1
1
IN12
0
1
1
0
0
IN13
0
1
1
0
1
0
1
1
1
0
IN15
0
1
1
1
1
IN16
1
0
0
0
0
IN17(REC)
1
0
0
0
1
IN18(SUB)
1
0
0
1
0
1
0
0
1
1
…
D10
0
…
D11
0
…
D12
0
…
D13
0
…
Input Selector (MAIN)
Select Address No.0 Setting Table
Function & Setting
D15 D14
MUTE
0
1
1
1
1
1
IN14
REC
ON/OFF
OFF
SUB
ON/OFF
Prohibition
OFF
0
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
0
0
Chip
Select
0
0
Rec
on/off
Sub
on/off
0
0
0
ON
1
Input Selector (MAIN)
ON
Rec
on/off
0
1
: Initial condition
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Datasheet
BD34704KS2
D12
D11
D10
MUTE
0
0
0
0
0
IN1
0
0
0
0
1
IN2
0
0
0
1
0
IN3
0
0
0
1
1
IN4
0
0
1
0
0
IN5
0
0
1
0
1
IN6
0
0
1
1
0
IN7
0
0
1
1
1
IN8
0
1
0
0
0
IN9
0
1
0
0
1
IN10
0
1
0
1
0
IN11
0
1
0
1
1
IN12
0
1
1
0
0
IN13
0
1
1
0
1
IN14
0
1
1
1
0
IN15
0
1
1
1
1
IN16
1
0
0
0
0
1
0
0
0
1
…
…
…
…
…
Input Selector (SUB1)
Select Address No.1 Setting Table
Function & Setting D15 D14 D13
1
1
1
1
1
Prohibition
D8
D7
D6
D5
D4
0
0
0
IN1
0
0
0
0
1
IN2
0
0
0
1
0
IN3
0
0
0
1
1
IN4
0
0
1
0
0
IN5
0
0
1
0
1
IN6
0
0
1
1
0
IN7
0
0
1
1
1
IN8
0
1
0
0
0
0
1
0
0
1
0
1
0
1
0
IN11
0
1
0
1
1
IN12
0
1
1
0
0
IN13
0
1
1
0
1
IN14
0
1
1
1
0
IN15
0
1
1
1
1
IN16
1
0
0
0
0
1
0
0
0
1
…
…
…
…
…
0
0
1
1
1
1
1
IN9
IN10
D3
D2
D1
D0
0
Chip
Select
0
1
Input Selector (SUB2)
0
MUTE
Input Selector (SUB2)
0
D9
Input Selector (SUB1)
Prohibition
: Initial condition
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Datasheet
BD34704KS2
Mode
Selector
C, SWch
Mode Selector
FL, FRch
Select Address No.2 Setting Table ※Select Address No.4 MSEL="0"(Front,C,SW,SR,SRB）
Function & Setting
D15 D14 D13
D12 D11 D10
D9
D8 D7 D6 D5
MUTE
0
0
MAIN
0
1
MULTI1
1
0
SUB1
1
1
0
0
MAIN
0
1
MULTI1
1
0
SUB1
1
1
Mode
Selector
SL, SRch
MUTE
MULTI1
Mode
Selector
FL, FRch
Mode
Selector
C, SWch
Mode Selector
SBL, SBRch
SUB1
MUTE
D3
D2
D1 D0
Mode
Selector
C, SWch
MUTE
MAIN
D4
Mode
Selector
SL, SRch
Mode
Selector
SBL, SBRch
0
0
0
1
1
0
1
1
Mode
Selector
SL, SRch
MULTI1
SUB1
MAIN
0
0
0
0
1
1
0
1
1
ADC ATT
0
Chip
1
Select
0
: Initial condition
Mode
Selector
C, SWch
Mode Selector
FL, FRch
Select Address No.2 Setting Table ※Select Address No.4 MSEL="1"(Front,C,SW,SR,SRB)
Function & Setting
D15 D14 D13
D12 D11 D10
D9
D8 D7 D6 D5
MUTE
0
0
SUB2
0
1
MULTI2
1
0
MULTI3
1
1
0
0
SUB2
0
1
MULTI2
1
0
Prohibition
1
1
Mode
Selector
SL, SRch
MUTE
MULTI2
Mode
Selector
FL, FRch
Mode Selector
SBL, SBRch
Prohibition
MUTE
SUB2
MULTI2
D2
D1 D0
Mode
Selector
C, SWch
Mode
Selector
SL, SRch
Mode
Selector
SBL, SBRch
0
0
0
1
1
0
1
1
Mode
Selector
SL, SRch
Prohibition
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
D3
Mode
Selector
C, SWch
MUTE
SUB2
D4
13/36
0
0
0
0
1
1
0
1
1
ADC ATT
0
Chip
1
Select
0
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
Select Address No.2 Setting Table
Function & Setting
D15 D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
MUTE
0
0
0
0dB
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
-12dB
1
1
0
Prohibition
1
1
1
D5
D4
ADC ATT
-6dB
Mode
Selector
FL, FRch
-6.5dB
-7.5dB
Mode
Selector
C, SWch
Mode
Selector
SL, SRch
-9dB
Mode
Selector
SBL,
SBRch
Volume channel Select
Select Address No.3 Setting Table
Volume
D15 D14 D13 D12 D11 D10
Function & Setting
Select2
FR
0
0
0
0
FL
0
0
0
1
SW
0
0
1
0
C
0
0
1
1
SR
0
1
0
0
SL
0
1
0
1
SBR
0
1
1
0
SBL
0
1
1
1
SUBR
1
0
0
0
SUBL
1
0
0
1
Prohibition
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
D9
0
D8
Volume
D7
D6
D3
D2
D1
D0
0
Chip
Select
1
0
D3
D2
D1
D0
0
Chip
Select
1
1
※Volume Select2 is available setting by Select Address No.4
: Initial condition
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TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
(Note) Considerations in the volume data transmission
※Setting range of FR,FL,SW,CEN,SR,SL,SBR and SBL is +32dB to -95dB.
※Setting range of SUBR and SUBL is +7.5dB to -91.5dB.
※The data transmission to NOT assigned place in data format is prohibition.
Setting table of dynamic range of 7.1ch and Sub Volume
FR
FL
SW
C
MAX
+32
+32
+32
+32
MAXS
:
:
:
:
:
:
:
:
MINS
:
:
:
:
MIN
-95
-95
-95
-95
SR
+32
:
:
:
-95
SL
+32
:
:
:
-95
SBR
+32
:
:
:
-95
SBL
+32
:
:
:
-95
SUBR
MUTE
+7.5
:
-91.5
MUTE
SUBL
MUTE
+7.5
:
-91.5
MUTE
MAX : maximum value of 7.1ch Volume MAXS : maximum value of Sub Volume
MIN : minimum value of 7.1ch Volume MINS : minimum value of Sub Volume
Select Address No.3 Setting Table
Function & Setting
D15 D14
MUTE
D13
D12
D11
1
D10
1
D9
1
D8
1
D7
1
D6
1
D5
1
D4
1
Prohibition
1
・
・
・
0
1
・
・
・
1
1
・
・
・
0
1
・
・
・
0
1
・
・
・
0
1
・
・
・
0
1
・
・
・
0
0
・
・
・
1
+32.0dB
0
1
0
0
0
0
0
0
+31.5dB
0
0
1
1
1
1
1
1
+31.0dB
0
0
1
1
1
1
1
0
+30.5dB
0
0
1
1
1
1
0
1
+30.0dB
0
0
1
1
1
1
0
0
+29.5dB
0
0
1
1
1
0
1
1
0
0
1
1
1
0
1
0
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
0
Volume
+29.0dB
+28.5dB
+28.0dB
+27.5dB
Volume
Channel
Select
1
0
0
1
1
0
1
1
1
+27.0dB
0
0
1
1
0
1
1
0
+26.5dB
0
0
1
1
0
1
0
1
+26.0dB
0
0
1
1
0
1
0
0
+25.5dB
0
0
1
1
0
0
1
1
+25.0dB
0
0
1
1
0
0
1
0
+24.5dB
0
0
1
1
0
0
0
1
+24.0dB
0
0
1
1
0
0
0
0
+23.5dB
0
0
1
0
1
1
1
1
+23.0dB
0
0
1
0
1
1
1
0
+22.5dB
0
0
1
0
1
1
0
1
+22.0dB
0
0
1
0
1
1
0
0
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15/36
D3
D2
D1
D0
0
Chip
Select
1
1
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
Select Address No.3 Setting Table
Function & Setting
D15 D14
+21.5dB
D13
D11
0
D10
0
D9
1
D8
0
D7
1
D6
0
D5
1
D4
1
+21.0dB
0
0
1
0
1
0
1
0
+20.5dB
0
0
1
0
1
0
0
1
+20.0dB
0
0
1
0
1
0
0
0
+19.5dB
0
0
1
0
0
1
1
1
+19.0dB
0
0
1
0
0
1
1
0
+18.5dB
0
0
1
0
0
1
0
1
+18.0dB
0
0
1
0
0
1
0
0
+17.5dB
0
0
1
0
0
0
1
1
+17.0dB
0
0
1
0
0
0
1
0
+16.5dB
0
0
1
0
0
0
0
1
+16.0dB
0
0
1
0
0
0
0
0
+15.5dB
0
0
0
1
1
1
1
1
+15.0dB
0
0
0
1
1
1
1
0
+14.5dB
0
0
0
1
1
1
0
1
+14.0dB
0
0
0
1
1
1
0
0
+13.5dB
0
0
0
1
1
0
1
1
+13.0dB
0
0
0
1
1
0
1
0
+12.5dB
0
0
0
1
1
0
0
1
+12.0dB
0
0
0
1
1
0
0
0
+11.5dB
0
0
0
1
0
1
1
1
0
0
0
1
0
1
1
0
0
0
0
1
0
1
0
1
0
0
0
1
0
1
0
0
0
0
0
1
0
0
1
1
+9.0dB
0
0
0
1
0
0
1
0
+8.5dB
0
0
0
1
0
0
0
1
+8.0dB
0
0
0
1
0
0
0
0
+7.5dB
0
0
0
0
1
1
1
1
+7.0dB
0
0
0
0
1
1
1
0
+6.5dB
0
0
0
0
1
1
0
1
+6.0dB
0
0
0
0
1
1
0
0
+5.5dB
0
0
0
0
1
0
1
1
+5.0dB
0
0
0
0
1
0
1
0
+4.5dB
0
0
0
0
1
0
0
1
+4.0dB
0
0
0
0
1
0
0
0
+3.5dB
0
0
0
0
0
1
1
1
+3.0dB
0
0
0
0
0
1
1
0
+2.5dB
0
0
0
0
0
1
0
1
+2.0dB
0
0
0
0
0
1
0
0
+1.5dB
0
0
0
0
0
0
1
1
+1.0dB
0
0
0
0
0
0
1
0
+0.5dB
0
0
0
0
0
0
0
1
Prohibition
0
0
0
0
0
0
0
0
-0dB
0
0
0
0
0
0
0
0
-0.5dB
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
+11.0dB
1
Volume
+10.5dB
+10.0dB
+9.5dB
D12
Volume
Channel
Select
-1.0dB
-1.5dB
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0
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D3
D2
D1
D0
0
Chip
Select
1
1
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
Select Address No.3 Setting Table
Function & Setting
D15 D14
-2.0dB
D13
D12
D11
0
D10
0
D9
0
D8
0
D7
0
D6
1
D5
0
D4
0
-2.5dB
0
0
0
0
0
1
0
1
-3.0dB
0
0
0
0
0
1
1
0
-3.5dB
0
0
0
0
0
1
1
1
-4.0dB
0
0
0
0
1
0
0
0
-4.5dB
0
0
0
0
1
0
0
1
-5.0dB
0
0
0
0
1
0
1
0
-5.5dB
0
0
0
0
1
0
1
1
-6.0dB
0
0
0
0
1
1
0
0
-6.5dB
0
0
0
0
1
1
0
1
-7.0dB
0
0
0
0
1
1
1
0
-7.5dB
0
0
0
0
1
1
1
1
-8.0dB
0
0
0
1
0
0
0
0
-8.5dB
0
0
0
1
0
0
0
1
-9.0dB
0
0
0
1
0
0
1
0
-9.5dB
0
0
0
1
0
0
1
1
-10.0dB
0
0
0
1
0
1
0
0
-10.5dB
0
0
0
1
0
1
0
1
-11.0dB
0
0
0
1
0
1
1
0
-11.5dB
0
0
0
1
0
1
1
1
-12.0dB
0
0
0
1
1
0
0
0
-12.5dB
0
0
0
1
1
0
0
1
0
0
0
1
1
0
1
0
0
0
0
1
1
0
1
1
0
0
0
1
1
1
0
0
-14.5dB
0
0
0
1
1
1
0
1
-15.0dB
0
0
0
1
1
1
1
0
-15.5dB
0
0
0
1
1
1
1
1
-16.0dB
0
0
1
0
0
0
0
0
-16.5dB
0
0
1
0
0
0
0
1
-17.0dB
0
0
1
0
0
0
1
0
-17.5dB
0
0
1
0
0
0
1
1
-18.0dB
0
0
1
0
0
1
0
0
-18.5dB
0
0
1
0
0
1
0
1
-19.0dB
0
0
1
0
0
1
1
0
-19.5dB
0
0
1
0
0
1
1
1
-20.0dB
0
0
1
0
1
0
0
0
-20.5dB
0
0
1
0
1
0
0
1
-21.0dB
0
0
1
0
1
0
1
0
-21.5dB
0
0
1
0
1
0
1
1
-22.0dB
0
0
1
0
1
1
0
0
-22.5dB
0
0
1
0
1
1
0
1
-23.0dB
0
0
1
0
1
1
1
0
-23.5dB
0
0
1
0
1
1
1
1
-24.0dB
0
0
1
1
0
0
0
0
-24.5dB
0
0
1
1
0
0
0
1
-25.0dB
0
0
1
1
0
0
1
0
-25.5dB
0
0
1
1
0
0
1
1
Volume
-13.0dB
-13.5dB
-14.0dB
Volume
Channel
Select
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D3
D2
D1
D0
0
Chip
Select
1
1
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
Volume
Select Address No.3 Setting Table
Function & Setting
D15 D14
D11
D10
D9
D8
D7
D6
D5
D4
-26.0dB
0
0
1
1
0
1
0
0
-26.5dB
0
0
1
1
0
1
0
1
-27.0dB
0
0
1
1
0
1
1
0
-27.5dB
0
0
1
1
0
1
1
1
-28.0dB
0
0
1
1
1
0
0
0
-28.5dB
0
0
1
1
1
0
0
1
-29.0dB
0
0
1
1
1
0
1
0
-29.5dB
0
0
1
1
1
0
1
1
-30.0dB
0
0
1
1
1
1
0
0
-30.5dB
0
0
1
1
1
1
0
1
-31.0dB
0
0
1
1
1
1
1
0
-31.5dB
0
0
1
1
1
1
1
1
-32.0dB
0
1
0
0
0
0
0
0
-32.5dB
0
1
0
0
0
0
0
1
-33.0dB
0
1
0
0
0
0
1
0
-33.5dB
0
1
0
0
0
0
1
1
-34.0dB
0
1
0
0
0
1
0
0
-34.5dB
0
1
0
0
0
1
0
1
-35.0dB
0
1
0
0
0
1
1
0
-35.5dB
0
1
0
0
0
1
1
1
-36.0dB
0
1
0
0
1
0
0
0
-36.5dB
0
1
0
0
1
0
0
1
-37.0dB
0
1
0
0
1
0
1
0
0
1
0
0
1
0
1
1
0
1
0
0
1
1
0
0
-38.5dB
0
1
0
0
1
1
0
1
-39.0dB
0
1
0
0
1
1
1
0
-39.5dB
0
1
0
0
1
1
1
1
-40.0dB
0
1
0
1
0
0
0
0
-40.5dB
0
1
0
1
0
0
0
1
-41.0dB
0
1
0
1
0
0
1
0
-41.5dB
0
1
0
1
0
0
1
1
-42.0dB
0
1
0
1
0
1
0
0
-42.5dB
0
1
0
1
0
1
0
1
-43.0dB
0
1
0
1
0
1
1
0
-43.5dB
0
1
0
1
0
1
1
1
-44.0dB
0
1
0
1
1
0
0
0
-44.5dB
0
1
0
1
1
0
0
1
-45.0dB
0
1
0
1
1
0
1
0
-45.5dB
0
1
0
1
1
0
1
1
-46.0dB
0
1
0
1
1
1
0
0
-46.5dB
0
1
0
1
1
1
0
1
-47.0dB
0
1
0
1
1
1
1
0
-47.5dB
0
1
0
1
1
1
1
1
-48.0dB
0
1
1
0
0
0
0
0
-48.5dB
0
1
1
0
0
0
0
1
-49.0dB
0
1
1
0
0
0
1
0
-49.5dB
0
1
1
0
0
0
1
1
-37.5dB
-38.0dB
D13
Volume
Channel
Select
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TSZ22111・15・001
D12
0
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D2
D1
D0
0
Chip
Select
1
1
TSZ02201-0C2C0E100210-1-2
2015.2.25 Rev.002
Datasheet
BD34704KS2
Volume
Select Address No.3 Setting Table
Function & Setting
D15 D14
D11
D10
D9
D8
D7
D6
D5
D4
-50.0dB
0
1
1
0
0
1
0
0
-50.5dB
0
1
1
0
0
1
0
1
-51.0dB
0
1
1
0
0
1
1
0
-51.5dB
0
1
1
0
0
1
1
1
-52.0dB
0
1
1
0
1
0
0
0
-52.5dB
0
1
1
0
1
0
0
1
-53.0dB
0
1
1
0
1
0
1
0
-53.5dB
0
1
1
0
1
0
1
1
-54.0dB
0
1
1
0
1
1
0
0
-54.5dB
0
1
1
0
1
1
0
1
-55.0dB
0
1
1
0
1
1
1
0
-55.5dB
0
1
1
0
1
1
1
1
-56.0dB
0
1
1
1
0
0
0
0
-56.5dB
0
1
1
1
0
0
0
1
-57.0dB
0
1
1
1
0
0
1
0
-57.5dB
0
1
1
1
0
0
1
1
-58.0dB
0
1
1
1
0
1
0
0
-58.5dB
0
1
1
1
0
1
0
1
-59.0dB
0
1
1
1
0
1
1
0
-59.5dB
0
1
1
1
0
1
1
1
-60.0dB
0
1
1
1
1
0
0
0
-60.5dB
0
1
1
1
1
0
0
1
-61.0dB
0
1
1
1
1
0
1
0
0
1
1
1
1
0
1
1
0
1
1
1
1
1
0
0
-62.5dB
0
1
1
1
1
1
0
1
-63.0dB
0
1
1
1
1
1
1
0
-63.5dB
0
1
1
1
1
1
1
1
-64.0dB
1
0
0
0
0
0
0
0
-64.5dB
1
0
0
0
0
0
0
1
-65.0dB
1
0
0
0
0
0
1
0
-65.5dB
1
0
0
0
0
0
1
1
-66.0dB
1
0
0
0
0
1
0
0
-66.5dB
1
0
0
0
0
1
0
1
-67.0dB
1
0
0
0
0
1
1
0
-67.5dB
1
0
0
0
0
1
1
1
-68.0dB
1
0
0
0
1
0
0
0
-68.5dB
1
0
0
0
1
0
0
1
-69.0dB
1
0
0
0
1
0
1
0
-69.5dB
1
0
0
0
1
0
1
1
-70.0dB
1
0
0
0
1
1
0
0
-70.5dB
1
0
0
0
1
1
0
1
-71.0dB
1
0
0
0
1
1
1
0
-71.5dB
1
0
0
0
1
1
1
1
-72.0dB
1
0
0
1
0
0
0
0
-72.5dB
1
0
0
1
0
0
0
1
-73.0dB
1
0
0
1
0
0
1
0
-73.5dB
1
0
0
1
0
0
1
1
-61.5dB
-62.0dB
D13
Volume
Channel
Select
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Datasheet
BD34704KS2
Select Address No.3 Setting Table
Function & Setting
D15 D14
D11
D10
D9
D8
D7
D6
D5
D4
-74.0dB
D13
D12
1
0
0
1
0
1
0
0
-74.5dB
1
0
0
1
0
1
0
1
-75.0dB
1
0
0
1
0
1
1
0
-75.5dB
1
0
0
1
0
1
1
1
-76.0dB
1
0
0
1
1
0
0
0
-76.5dB
1
0
0
1
1
0
0
1
-77.0dB
1
0
0
1
1
0
1
0
-77.5dB
1
0
0
1
1
0
1
1
-78.0dB
1
0
0
1
1
1
0
0
-78.5dB
1
0
0
1
1
1
0
1
-79.0dB
1
0
0
1
1
1
1
0
-79.5dB
1
0
0
1
1
1
1
1
-80.0dB
1
0
1
0
0
0
0
0
-80.5dB
1
0
1
0
0
0
0
1
-81.0dB
1
0
1
0
0
0
1
0
-81.5dB
1
0
1
0
0
0
1
1
-82.0dB
1
0
1
0
0
1
0
0
-82.5dB
1
0
1
0
0
1
0
1
-83.0dB
1
0
1
0
0
1
1
0
-83.5dB
1
0
1
0
0
1
1
1
-84.0dB
1
0
1
0
1
0
0
0
1
0
1
0
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
Volume
-84.5dB
-85.0dB
-85.5dB
-86.0dB
Volume
Channel
Select
0
1
0
1
0
1
1
0
0
-86.5dB
1
0
1
0
1
1
0
1
-87.0dB
1
0
1
0
1
1
1
0
-87.5dB
1
0
1
0
1
1
1
1
-88.0dB
1
0
1
1
0
0
0
0
-88.5dB
1
0
1
1
0
0
0
1
-89.0dB
1
0
1
1
0
0
1
0
-89.5dB
1
0
1
1
0
0
1
1
-90.0dB
1
0
1
1
0
1
0
0
-90.5dB
1
0
1
1
0
1
0
1
-91.0dB
1
0
1
1
0
1
1
0
-91.5dB
1
0
1
1
0
1
1
1
-92.0dB
1
0
1
1
1
0
0
0
-92.5dB
1
0
1
1
1
0
0
1
-93.0dB
1
0
1
1
1
0
1
0
-93.5dB
1
0
1
1
1
0
1
1
-94.0dB
1
0
1
1
1
1
0
0
-94.5dB
1
0
1
1
1
1
0
1
-95.0dB
1
0
1
1
1
1
1
0
Prohibition
1
・
・
・
1
0
・
・
・
1
1
・
・
・
1
1
・
・
・
1
1
・
・
・
1
1
・
・
・
1
1
・
・
・
1
1
・
・
・
1
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Datasheet
BD34704KS2
Volume SUB
Select2 MUTE
SB
Select
MSEL
SURB
MSEL
SUR
MSEL MSEL
C,SW FRONT
PREOUT
SEL
Select Address No.4 Setting Table ※ON/OFF of each MSEL is reflected by a mode selector of Address No. 2
Function & Setting
D15 D14 D13 D12 D11 D10 D9
D8
D7 D6 D5 D4
D3 D2
MUTE
FRONT
SURB
OPEN
OFF
ON
OFF
ON
OFF
ON
OFF
ON
SURB
FRONT
MUTE OFF
MUTE ON
OFF
ON
0
0
1
1
0
1
0
1
Mode Selector
REC
Mode Selector
SUB
MSEL
SURB
SB
Select
1
SUB
MUTE
Volume
Select2
0
1
PREOUT
SEL
MAIN
0
0
0
1
SUB2
1
0
MULTI
1
1
MAIN
Mode
Selector
REC
MULTI
MSEL
FRONT
D13
D0
0
0
MSEL
SUR
0
SUB1
SUB2
MSEL
C.,SW
0
1
Select Address No.6 Setting Table
Function & Setting
D15 D14
SUB1
MSEL
FRONT
D1
0
0
0
1
Chip
Select
0
1
MSEL
C,SW
D12
MSEL
SUR
0
1
MSEL
SURB
SB
Select
0
1
0
1
SUB
MUTE
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
1
Chip
Select
1
0
Mode
Selector
SUB
0
0
0
1
1
0
1
1
: Initial condition
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BD34704KS2
A→B
switching-time
Select Address No.7 setting table
Function & Setting
D15 D14
11.2msec
0
0
0
4.7msec
0
0
1
7.2msec
0
1
0
14.4msec
0
1
1
3.2msec
1
0
0
2.3msec
1
0
1
1
1
0
1
1
1
B→A
switching-time
Prohibition
Base
Clock
D12
D11
D10
0
0
0
4.7msec
0
0
1
7.2msec
0
1
0
14.4msec
0
1
1
3.2msec
1
0
0
2.3msec
1
0
1
1
1
0
1
1
1
A→B
switching-time
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
1
Chip
Select
1
1
B→A
switching-time
11.2msec
Prohibition
System
Reset
D13
Base
Clock
System
Reset
0
x1
0
0
×1/2
1
B→A
switching-time
Normal
0
Base
Clock
Reset
1
: Initial condition
Select Address No.7, Data = D15-D13：Below A → B switching time is adjustable.
Select Address No.7, Data = D12-D10：Below B → A switching time is adjustable.
※Switching time over 11.2msec is recommended for both A→B and B→A.
※Set to same switching time for both A→B, B→A is recommended if the switching times need to be changed.
[wait time]
=Twait
Current XdB
Send YdB
[A→B switching time]
=Tsft
[B→A switching time]
=Tsft
A→B
B→A
Change YdB
W
Switching Time (Tsoft)
Figure 11. Micro step volume switching time
If the base clock is set to x1/2, the switching time will be doubled.
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BD34704KS2
Micro step volume circuit
1. Micro step volume technology.
1-1. Micro step volume effects.
Micro step volume is Rohm original switching pop noise prevention technology. The audible signal is discontinuous
during the gain switching instantly which cause the noise to occur. This micro step volume will prevent this discontinuous
signal by completing the signal waveform and will significantly reduce the noise.
Control signal
If the gain instantly changes after the data is transmitted, the DC fluctuation
will occur as much as before and after the oscillation different. This
technology makes this fluctuation changes slow.
DC
fluctuation
Micro step
volume
waveform
Figure 12. Micro step volume waveform
This micro step volume will start the switching when received the signal sent from the micon.
At any constant time, the switching waveform is shown as above figure. This IC will optimally operates by internally
processes the data sent from the micon to prevent the switching shock.
However, sometimes the switching waveform is not like the intended form depends on the transmission timing.
Therefore, below is the example of the relationship between the transmission timing and actual switching time. Please
consider this relationship for the setting.
1-2. Micro step volume application target block
・Micro step volume application target blocks are 7.1ch volume and SUB volume.
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BD34704KS2
2．About data transmission of Micro step volume circuit
2-1. Switching time of Micro step volume
This switching time includes [Wait time], [A→B switching time] and [B→A switching time]. Every switching time needs
around 25msec. (Tsoft = Twait + 2 * Tsft, Twait=2.3msec, Tsft=11.2msec)
Please take note that Twait is wait time for starting switching and the setting is 2.3msec. (Twait considers the internal IC
tolerance, therefore this time need to be set within 1.3msec (Min.) to 4.6msec (Max.).
[wait time]
=Twait
Current XdB
Send YdB
[A→B switching time]
=Tsft
[B→A switching time]
=Tsft
A→B
B→A
Change YdB
W
Switching Time (Tsoft)
Figure 13. [A→B switching time] and [B→A switching time]
In addition, base clock can change the frequency using the internal oscillation device. For example, when base clock
x1/2 is selected, [Wait time], [A→B switching time] and [B→A switching time] are doubled.
2-2. Same block data transmission timing and switching operation.
■ Transmission example 1
The time chart from data transmission to switching start time is shown as below.
At first, below figure shows transmitted data with the same block which is separated with enough interval.
This enough interval refers to the tolerance margin time of Tsoft multiplied by 1.4.
Serial data
(FL 0dB)
(FL -∞dB)
Tsoft * 1.4 msec
W
Switching time
A→B
B→A
W
A→B
B→A
FL output
■
Transmission example 2
Next, below figure shows the example of when the transmission interval is not enough (smaller than above interval).
When the data transmitted during the first operation of the switching, the second data transmission will continue after
complete the first operation. In this case, there is no wait time (Twait) before the second transmission.
Serial data
(FL 0dB)
Switching time
(FL -∞dB)
W
A→B
B→A
A→B
B→A
FL output
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BD34704KS2
■ Transmission example 3
Next is the example for switching operation with smaller data transmission interval.
invalid data
①
②
③
④
Serial data
W
Switching time
Output
Initial
A→B
B→A
A→B
Initial → ①
①→②
②→④
B→A
④
Data ② is the data during the A→B operation, so this data is valid, and then during B→A operation, data ① promptly
switches to data ②.
Data ③ and data ④ are data during B→A operation, therefore these data are valid for the next switching, but data ③ got
overwritten by data ④ so data ③ will become invalid. Only data ④ is valid.
There is no regulation on the transmission timing.
For data transmission to multi-channels, there is a caution. The combination of Lch and Rch for same block will make the
switching is possible to change at same timing. When the setting is data ① for FL (Lch) and data ② for FR (Rch), same
switching timing is possible if the data transmission is set as below figure.
FL
FR
① ②
Serial data
T②-①　＜ Twait
W
Switching time
A→B
B→A
Output FL
Initial
Initial → ①
①
Output FR
Initial
Initial → ②
②
Figure 14. The operation during multi-channels (Lch, Rch) data transmission (smaller than Twait interval).
Next, when data ② is not transmitted during the Twait, the switching operation is as following figure.
FR
FL
①
②
Serial data
T②-①　＞ Twait
W
Switching time
Output FL
Initial
Output FR
Initial
A→B
B→A
Initial → ①
①
A→B
B→A
Initial → ②
②
Figure 15. The operation during multi-channels (Lch, Rch) data transmission (larger than Twait interval).
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BD34704KS2
2-3. Multi-blocks data transmission timing and switching operation.
In case of the data is transmitted to the multi-blocks, the processing is performed to each sequence which is
defined by the IC internally.
This sequence determines the Micro step volume starting order operation.
■Transmission example 1
In case of multi-channels operates as transmission order (during 3 channels transmission).
Serial data
(FL 0dB)
(SW 0dB)
(SL 0dB)
FL Switching time
W
Switching time
A→B
SW Switching time
B→A
A→B
SL Switching time
B→A
A→B
B→A
FL output
SW output
SL output
There is no constraint for the data transmission timing, however the timing of switching start becomes to switching after
the current timing is ended.
Please take note that, the timing of switching start is not depending on data setting order but only based on the regulated
order by Figure16. (Transmission example 2)
Lch
Rch
State1
State2
State3
State4
State5
FL
SW
SL
SBL
SUBL
FR
C
SR
SBR
SUBR
Figure 16. Volume switching stage
※ Blocks in the same stage is possible to start the switching at the same timing.
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BD34704KS2
■Transmission example 2
In case of the transmission order is different with actual switching order.
①
例：①FL -6dB
②FL -20dB
③SL -6dB
④SW -6dB
② ③ ④
Serial data
FL Switching time
W
Switching time
A→B
Output FL
Initial Initial → ①
Output SW
Initial
Output SL
Initial
SW Switch time
B→A
A→B
SL Switching time
B→A
A→B
FL Switching time
B→A
①
Initial → ④
A→B
B→A
①→②
②
④
Initial → ③
③
During FL switching, in case of FL/SW/SL continuously received, SW and SL switching are the priority.
If you want the switching starts as the data transmission order, please transmit the next data after current switching is
ended.
■Transmission example 3
For same data transmission, the IC will internally judge that there is no difference with the current data setting and
therefore gain switching operation will not start.
Continuing the same data transmission and transmit the other block data.
Serial data
(FL 0dB)
(FL 0dB)
(SW 0dB)
same data
FL Switching time
Switching time
W
A→B
B→A
SW Switching time
A→B
B→A
2-4. How to reduce pop noise
Pop noise level is different base on the Micro step internal state A and B output DC offset difference.
To reduce the pop noise level, set for longer switching time might solve this problem.
Change the setting for [A→B switching time] and [B→A switching time], and confirm pop the noise level.
At this time, if [A→B switching time] and [A→B switching time] setting is different, the pop noise reduction effect will
decrease. Therefore, it is recommended to set these switching with same time.
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BD34704KS2
Application Circuit Diagram
Figure 17. Application Circuit Diagram
Notes on wiring
1. GND has to be wired from reference point and it should be thick. Setting error occur by common impedance
on GND line to be big in case of big attenuation setting.
2. Wiring pattern of CL and DA shall be away from the analog unit and cross-talk is not acceptable.
3. If possible, lines of CL and DA are not parallel. If they are adjacent to each other, the lines should be shielded.
4. Please concentrate on wiring pattern of the input terminal for input selector to the crosstalk. It is recommended
that it is shielded during wiring period.
5. Please connect the decoupling capacitor of the power supply in the shortest distance as much as possible to
VCC and GND, VEE.
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BD34704KS2
Power Dissipation
Thermal design for the IC
Temperature has great influence to the IC characteristics, and exceeding the absolute maximum ratings may degrade
and damage the IC. A proper consideration must be given from two points, immediate damage and long-term reliability
of operation.
Reference data
Power Dissipation Pd(W)
SQFP-T80C
Measurement condition: ROHM Standard board
Board Size：70×70×1.6(㎣)
Material：A FR4 grass epoxy board
(3% or less of copper foil area)
2.0
1.75W
θja = 71.4°C/W
1.0
0.0
0
25
50
75
85
100
125
150
Ambient Temperature Ta(°C)
Figure 18. Temperature Derating Curve
(Note) Values mentioned above are based on actual measurement, and not guaranteed.
Power dissipation value varies depending to the board on which the IC is mounted.
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Datasheet
BD34704KS2
I/O equivalence circuit(s)
Terminal
Number
Terminal
Name
Terminal
Voltage (V)
Equivalent Circuit
VCC
21～27
32
39
59
70
73～79
GND
Terminal Description
Analog ground terminals.
0
VEE
VCC
3
5
7
VCC
VEE1
VEE2
Positive power supply terminal
Negative power supply terminal
+7
-7
VEE1
VEE2
Digital ground terminal.
VCC
4
DGND
0
VEE
V CC
1
2
80
DA
CL
CHIP
Input terminals for a clock and data.
-
V EE
8
10
12
14
15
16
17
18
71
72
OUTFL
OUTFR
OUTSW
OUTC
OUTSL
OUTSR
OUTSBL
OUTSBR
ADCR
ADCL
Output terminal s for analog sound signal.
V CC
0
V EE
Output terminals for analog sound signal.
(SUB/REC)
V EE
28
29
30
31
SUBR
SUBL
RECR
RECL
0
100k
V EE
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BD34704KS2
Terminal
Number
Terminal
Name
33
34
35
36
37
38
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
INR12
INL12
INR11
INL11
INR10
INL10
INR9
INL9
INR8
INL8
INR7
INL7
INR6
INL6
INR5
INL5
INR4
INL4
INR3
INL3
INR2
INL2
INR1
INL1
Terminal
Voltage (V)
Equivalent Circuit
Input terminals for stereo sound signal.
Input impedance is 100kΩ(Typ)
VCC
100k
0
VEE
Input terminals for an analog multi sound
signal.
Input impedance is 100kΩ(Typ)
VCC
60
61
62
63
64
65
66
67
68
69
SBRIN
SBLIN
SRIN
SLIN
CIN
SWIN
FRIN
FLIN
FRIN3
FLIN3
100k
0
VEE
Output terminal for FRONT pre-output.
The impedance of output switch is
0.8kΩ (Typ)
VCC
19
20
OUTPL
OUTPR
Terminal Description
0
VEE
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BD34704KS2
Operational Notes
1.
Reverse Connection of Power Supply
Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when
connecting the power supply, such as mounting an external diode between the power supply and the IC’s power
supply terminals.
2.
Power Supply Lines
Design the PCB layout pattern to provide low impedance supply lines. Separate the ground and supply lines of the
digital and analog blocks to prevent noise in the ground and supply lines of the digital block from affecting the analog
block. Furthermore, connect a capacitor to ground at all power supply pins. Consider the effect of temperature and
aging on the capacitance value when using electrolytic capacitors.
3.
VEE Voltage
Ensure that no pins are at a voltage below that of the VEE pin at any time, even during transient condition.
4.
Ground Wiring Pattern
GND pins which are digital ground(4pin) and analog ground(21-27,32,39,59,70,73-79pin) are not connected inside
LSI. These ground pins traces should be routed separately but connected to a single ground at the reference point of
the application board. Also ensure that the ground traces of external components do not cause variations on the
ground voltage. The ground lines must be as short and thick as possible to reduce line impedance.
5.
Thermal Consideration
Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in
deterioration of the properties of the chip. The absolute maximum rating of the Pd stated in this specification is when
the IC is mounted on a 70mm x 70mm x 1.6mm glass epoxy board. In case of exceeding this absolute maximum
rating, increase the board size and copper area to prevent exceeding the Pd rating.
6.
Recommended Operating Conditions
These conditions represent a range within which the expected characteristics of the IC can be approximately
obtained. The electrical characteristics are guaranteed under the conditions of each parameter.
7.
Rush Current
When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush
current may flow instantaneously due to the internal powering sequence and delays, especially if the IC
has more than one power supply. Therefore, give special consideration to power coupling capacitance,
power wiring, width of ground wiring, and routing of connections.
8.
Operation Under Strong Electromagnetic Field
Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.
9.
Testing on Application Boards
When testing the IC on an application board, connecting a capacitor directly to IC pin may subject the IC to stress.
Always discharge capacitors completely after each process or step. The IC’s power supply should always be turned
off completely before connecting or removing it from the test setup during the inspection process. To prevent damage
from static discharge, ground the IC during assembly and use similar precautions during transport and storage.
10. Inter-pin Short and Mounting Errors
Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in
damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin.
Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment)
and unintentional solder bridge deposited in between pins during assembly to name a few.
11. Unused Input Terminals
Because the input impedance of the terminal becomes 100kΩ when the signal input terminal makes a terminal open,
the plunge noise from outside sometimes becomes a problem. Please connect the no using input pin to GND. And
please open the no using output pin.
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BD34704KS2
Operational Notes – continued 1
12. Regarding the Input Pin of the IC
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them
isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a
parasitic diode or transistor. For example (refer to figure below):
When VEE > Pin A and VEE > Pin B, the P-N junction operates as a parasitic diode.
When VEE > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to
operate, such as applying a voltage lower than the VEE voltage to an input pin (and thus to the P substrate) should
be avoided.
Resistor
Transistor(NPN)
Pin A
Pin B
Pin B
B
C
E
Pin A
B C
+
+
+
P
N P P+
P N
P
P
N
N
N
N
N
N
Parasitic
E
Elements
Parasitic
P Substrate
P Substrate
Elements
Parasitic
Elements
VEE
Parasitic
Elements
VEE
VEE
N Region
close- by
VEE
Figure 19. Example of monolithic IC structure
13. Ceramic Capacitor
When using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with
temperature and the decrease in nominal capacitance due to DC bias and others.
14.
About power ON/OFF
1. At power ON/OFF, a pop sound will be generated and, therefore, use MUTE on the set.
2. When turning on power supplies, VEE and VCC should be powered on simultaneously or VEE first; then
followed by VCC.(tdelay should be VEE=<VCC on power ON, VCC=<VEE on power OFF) If the VCC side is
started up first, an excessive current may pass VCC through VEE.
3.This IC include power ON reset circuit. To be effective this function, trise should be more than 20μsec.
tdelay
trise
trise
tdelay
VCC
VEE
Figure 20. Timing chart of power ON/OFF
15. About function switching
When switching Input Selector, Mode selector or Input Gain, use MUTE on Volume.
16. Volume gain switching
In case of the boost of the volume when changing to the high gain which exceeds +20dB especially, the switching
pop noise sometimes becomes big. In this case, we recommend changing every 1 dB step without changing a gain at
once. Also, the pop noise sometimes can reduce by making micro-step volume switching time long, too.
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BD34704KS2
Operational Notes – continued 2
17.
Output load characteristic
The usages of load for output are below (reference). Please use the load more than 10 kΩ(TYP)
Output terminal
Terminal
Terminal
No.
Name
8
OUTFL
10
OUTFR
12
OUTSW
14
OUTC
Terminal
No.
15
16
17
18
Terminal
Name
OUTSL
OUTSR
OUTSBL
OUTSBR
Terminal
No.
29
28
31
30
Terminal
Name
SUBL
SUBR
RECL
RECR
Terminal
No.
71
72
-
Terminal
Name
ADCR
ADCL
-
5
VO,max Vrms
4
3
2
VCC=+7V
VEE=-7V
THD+N=1%
BW=400～30kHz
1
0
100
1000
10000
100000
Load Resistance Ω
Figure 21. Output load characteristic at VCC=+7V, VEE=-7V(Reference)
Ordering Information
B
D
3
4
7
Part Number
0
4
K
S
2
Package
KS2: SQFP-T80C
Packaging and forming specification
none: Tray
E2: Embossed tape and reel
Marking Diagram(TOP VIEW)
SQFP-T80C(TOP VIEW)
Part Number Marking
BD34704KS2
LOT Number
1PIN MARK
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BD34704KS2
Physical Dimension, Tape and Reel Information
Package Name
SQFP-T80C
aaaaaaaaaa
<Tape and Reel information>
Container
Tray (with dry pack)
Quantity
500pcs
Direction of feed
Direction of product is fixed in a tray
1pin
∗ Order quantity needs to be multiple of the minimum quantity.
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Datasheet
BD34704KS2
Revision History
Date
Revision
7.Nov.2014
25.Feb.2015
001
002
Changes
New Release
Add Micro-step volume specification
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Datasheet
Notice
Precaution on using ROHM Products
1.
Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
(Note 1)
, transport
intend to use our Products in devices requiring extremely high reliability (such as medical equipment
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅣ
CLASSⅢ
2.
ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3.
Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4.
The Products are not subject to radiation-proof design.
5.
Please verify and confirm characteristics of the final or mounted products in using the Products.
6.
In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7.
De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8.
Confirm that operation temperature is within the specified range described in the product specification.
9.
ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1.
When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2.
In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must
be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,
please consult with the ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice-PGA-E
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.001
Datasheet
Precautions Regarding Application Examples and External Circuits
1.
If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2.
You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1.
Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2.
Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3.
Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4.
Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign
trade act, please consult with ROHM in case of export.
Precaution Regarding Intellectual Property Rights
1.
All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data.
2.
ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the
Products with other articles such as components, circuits, systems or external equipment (including software).
3.
No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM
will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to
manufacture or sell products containing the Products, subject to the terms and conditions herein.
Other Precaution
1.
This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2.
The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3.
In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4.
The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice-PGA-E
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.001
Datasheet
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3.
The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Notice – WE
© 2015 ROHM Co., Ltd. All rights reserved.
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