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Sound Processors for BOOM BOX / Mini-component Stereo
Single Power Supply Sound Processors
with Built-in Pre Amplifier for Tape Recording
and Play Back (With Integrated 2-/3- band Equalizer)
BD3401KS2,BD3402KS2
●Description
The Sound Processor with built-in record/play functions for cassette players, is suited for sound quality products such as,
BOOM BOX, mini- and micro-audio systems. It incorporates various functions ranging from audio source selectors to
preamplifiers at the front stage, preamplifier for cassette recording/playing , and a 2-wire serial bus.
●Features
1) Provides Surround and Bass Boost with the Soft-switching feature to reduce the shock sound at switching (BD3401KS2)
2) Provides a specialized p ower supply terminal in a digital circuit, in order to set and maintain the state inside the IC
by the minute stand-by current.
3) Built-in preamplifier for cassette recording/playing allows for minimal external components, freeing up board space.
4) Arranges all I/O terminals to a single point and allows easy PCB routing.
5) Volume and Tone implemented with a resistance ladder circuit; achieving high performance with low noise and low distortion
6) Energy-saving design resultin g in low current consumption, by utilizing the BiCMOS proce ss.
It has the advantage in quality over the scaling down the power heat control of the internal regulators.
●Applications
BOOM BOX, mini-audio systems, and micro-audio systems.
●Product lineup Parameter BD3401KS2 BD3402KS2
Equalizer 3 band(BASS, MIDDLE, TREBLE) 2 band(BASS, TREBLE)
Volume 0 to -44dB/2dB step
-44 to -76dB/4dB step, -∞dB 0 to -44dB/2dB step
-44 to -76dB/4dB step, -∞dB
Cassette Recording/Playing Amplifier ○ ○
Karaoke ○ -
Microphone Input ○ -
Subwoofer Output ○ -
Output for Spectrum Analyzer ○ -
Surround ○ -
Bass Boost ○ -
Package SQFP-T64 SQFP-T64
●Absolute maximum ratings (Ta=25℃)
Items Symbol Ratings Unit
Power Supply Voltage Vcc 10 V
Vdd 6 V
Power Dissipation Pd 1200* mW
Input Voltage Range Vin GND-0.3 to VCC+0.3 V
Operating Temperature Rang e Topr -25 to +75 ℃
Storage Temperature Range Tstg -55 to +125 ℃
* Reduced by 12 mW/℃ over 25℃, when installed on the standard board (size: 70×70×1.6mm).
●Operating voltage ra nge
Device Name Symbol Range Unit
BD3401KS2
BD3402KS2 Vcc 8 to 9.5 V
Vdd 3 to 5.5
No.10086EAT03
Technical Note
2/18
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BD3401KS2,BD3402KS2
●Electrical cha r acteristics
BD3401KS2
Ta=25 ℃, VCC=9V, VDD=5V, f=1kHz, Vi=1Vrms,RL=10kΩ,Rg=600Ω, INPUT SELECTOR=Ach, INPUT GAIN=0dB,
VOLUME=0dB, TREBLE=0dB, BASS=0dB, MIDDLE=0dB, TONE ATT=0dB, MUX=STEREO, MIXING=OFF, MIXING
GAIN=0dB, PLAY BACK=TAPE A, REC=OFF, LINE=OFF, MIC=OFF, BASS BOOST=OFF, SURROUND=OFF, AMS=OFF,
ALC=OFF, INPUT= pin59,60, OUTPUT=pin32,33, unless otherwise noted.
Parameter Symbol Limits Unit Conditions
Min. Typ. Max.
TOT AL
Circuit Current IQ - 35 50 mA (No signal)
Output Voltage Gain Gv -2 0 2 dB INPUT GAIN=0dB
Total Harmonic Distortion ratio THDt - 0.005 0.05 % BW=400 to 30kHz
OUT=pin32,33,53,54
Maximum Output Voltage Vomaxt 2.0 2.5 - Vrms THD=1%, BW=400 to 30kHz
OUT=pin32,33,53,54
Residual Noise Voltage* Vr - 1.8 6.0 µVrms Rg=0Ω, Vol=-dB, BW=IHF-A,
Output Noise Voltage* Vno - 3.0 9.0 µVrms Rg=0Ω, Vol=0dB BW=IHF-A
Cross-talk between Channels* CTC - -80 -70 dB Rg=0Ω, BW=IHF-A
VOLOUT=1Vrms
Cross-talk between Selectors* CTS - -80 -70 dB Rg=0Ω, BW=IHF-A
Input Impedance Rin 32 47 62 kΩ Pin1 to 4, 59 to 64
MIXING
Total Harmonic Distortion ratio THDmix - 0.01 0.1 % BW=400 to 30kHz, MIXING=ON
INPUT SELECTOR=B
Maximum Output Voltage Vomaxmix 2.0 2.5 - Vrms THD=1%, BW=400 to 30kHz
MIXING=ON
INPUT SELECTOR=B
PLAYBACK
Output Voltage Gain Gvp 23 25 27 dB Vi=20mVrms, pin5-6, 7-8=short
IN=pin9,10 OUT=pin6,7
Total Harmonic Distortion ratio THDp - 0.01 0.1 % Vi=20mVrms BW=400 to 30kHz
pin5-6, 7-8=short
IN=pin9,10 OUT=pin6,7
Maximum Output Voltage Vomaxp 2.0 2.5 - Vrms THD= 1%, BW=400 to 30kHz
pin5-6, 7-8=short
IN=pin9,10 OUT=pin6,7
Noise Voltage in input term* Vnin - 0.7 6.0 µVrms Rg=0Ω,BW=IHF-A
pin5-6, 7-8=short
IN=pin9,10 OUT=pin6,7
PB MUTE Amount PBM - - -70 dB BW=IHF-A, pin5-6, 7-8=short
IN=pin9,10
PLAY BACK=MUTE
REC
ALC Operation Level ALC 0.5 0.7 0.9 Vrms REC=ON ALC=ON
Total Harmonic Distortion ratio THDr - 0.2 1 % BW=400 to 30kHz
OUT=pin14,15
REC=ON ALC=ON
Output Noise Voltage* Vnor - 40 120 µVrms Rg=0Ω, BW=IHF-A
OUT=pin14,15
REC=ON ALC=ON
Technical Note
3/18
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BD3401KS2,BD3402KS2
Parameter Symbol Limits Unit Conditions
Min Typ. Max
MIC
Total Harmonic Distortion ratio THDmic - 0.01 0.1 % BW=400 to 30kHz
MIC=ON
Maximum Output Voltage Vomaxmic 2.0 2.5 - Vrms THD=1%, BW=400 to 30kHz
MIC=ON
SPECTRUM
ANALYZER
S pectrum Analyzer 1
Output Voltage Gain Gvs1 -8 -6 -4 dB OUTPUT=pin55
S pectrum Analyzer 2
Output Voltage Gain Gvs2 -2 0 2 dB OUTPUT=pin56
SURRO
UND
Surround Gain Gsur 4 6 8 dB
SURROUND=ON
Vi=500mVrms
TREBLE
Treble Gain Gt -8 to +8(2dB/step) dB Vi=500mVrms
Treble Gain Setting Error TE -2 0 2 dB
MIDDLE
Middle Gain Gm -8 to +8(2dB/step) dB Vi=500mVrms
Middle Gain Setting Error ME -2 0 -2 dB
BASS
Bass Gain Gb -8 to +8(2dB/step) dB Vi=500mVrms
Bass Gain Setting Error BE -2 0 -2 dB
AMS
AMS EQ Gain Gams 33 35 37 dB OUTPUT=pin40
AMS=ON, Vi=20mVrms
VOLUME
Volume Setting Error 1 VE1 -2 0 2 dB 0 to -48dB,BW=IHF-A
VOLOUT=1Vrms
Volume Setting Error 2 VE2 -3 0 3 dB -52 to –76dB,BW=IHF-A
VOLOUT=1Vrms
Maximum Attenuation* Vmin - - -90 dB BW=IHF-A VOLOUT=1Vrms
SUBWOOFER
Total Harmonic Distortion ratio THDs - 0.01 0.1 % Vi=500mVrms
BW=400 to 30kHz,OUT=pin25
No LPF
Maximum Output Voltage Vomaxs 1.5 2.0 2.5 Vrms THD=3%, BW=400 to 30k Hz
OUT=pin25, No LPF
Technical Note
4/18
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BD3401KS2,BD3402KS2
BD3402KS2
Ta=25℃, VCC=9V, VDD=5V, f=1kHz, Vi=1Vrms, RL=10kΩ, Rg=600Ω,INPUT SELECTOR=Ach, INPUT GAIN=0dB,
VOLUME=0dB, TREBLE=0dB, BASS=0dB, TONE ATT=0dB, MUX=STEREO, MIXING=OFF, MIXING GAIN=0dB,
REC=OFF, LINE=OFF, ALC=OFF INPUT=pin59,60, OUTPUT=pin32,33, unless otherwise noted.
Parameter Symbol Limits Unit Conditions
Min. Typ. Max.
TOT AL
Circuit Current IQ - 28 50 mA (No signal)
Output Voltage Gain Gv -2 0 2 dB INPUT GAIN=0dB
Total Harmonic Distortion ratio THDt - 0.005 0.05 % BW=400 to 30kHz
OUT=pin32,33,53,54
Maximum Output Voltage Vomaxt 2.0 2.5 - Vrms THD=1%, BW=400 to 30kHz
OUT=pin32,33,53,54
Residual Noise Voltage* Vr - 1.5 5.0 µVrms Rg=0Ω, Vol=-∞dB
BW=IHF-A,
Output Noise Voltage* Vno - 2.5 8.0 µVrms Rg=0Ω, Vol=0dB BW=IHF-A
Cross-talk between Channels* CTC - -80 -70 dB Rg=0Ω, BW=IHF-A
VOLOUT=1Vrms
Cross-talk between Selectors* CTS - -80 -70 dB Rg=0Ω, BW=IHF-A
Input Impedance Rin 32 47 62 kΩ Pin1 to 4, 59 to 64
MIXING
Total Harmonic Distortion ratio THDmix - 0.01 0.1 % BW=400 to 30kHz
MIXING=ON
INPUT SELECTOR=B
Maximum Output Voltage Vomaxmix 2.0 2.5 - Vrms THD=1%, BW=400 to 30kHz
MIXING=ON
INPUT SELECTOR=B
PLAYBACK
Output Voltage Gain Gvp 23 25 27 dB Vi=20mVrms
pin5-6, 7-8=short
IN=pin11,12 OUT=pin6,7
Total Harmonic Distortion ratio THDp - 0.01 0.1 % Vi=20mVrms BW=400 to 30kHz
pin5-6, 7-8=short
IN=pin11,12 OUT=pin6,7
Maximum Output Voltage Vomaxp 2.0 2.5 - Vrms THD=1%, BW=400 to 30kHz
pin5-6, 7-8=short
IN=pin11,12 OUT=pin6,7
Noise Voltage in input term* Vnin - 0.7 6.0 µVrms Rg=0Ω,BW=IHF-A
pin5-6, 7-8=short
IN=pin11,12 OUT=pin6,7
PB MUTE Amount PBM - - -70 dB BW=IHF-A, pin5-6, 7-8=short
IN=pin11,12
PLAY BACK=MUTE
REC
ALC Operation Level ALC 0.5 0.7 0.9 Vrms REC=ON ALC=ON
Total Harmonic Distortion ratio THDr - 0.2 1 % BW=400 to 30kHz
OUT=pin14,15
REC=ON, ALC=ON
Output Noise Voltage* Vnor - 40 120 µVrms Rg=0Ω, BW=IHF-A
OUT=pin14,15
REC=ON, ALC=ON
TREBLE
Treble Gain Gt -8 to +8(2dB/step) dB Vi=500mVrms
Treble Gain Setting Error TE -2 0 2 dB
BASS
Bass Gain Gb -12 to +12(3dB/step) dB Vi=500mVrms
BASS
Bass Gain Setting Error BE -2 0 -2 dB
VOLUME
Volume Setting Error 1 VE1 -2 0 2 dB 0 to -48dB,BW =IHF-A
VOLOUT=1Vrms
Volume Setting Error 2 VE2 -3 0 3 dB -52 to
–
76dB,BW=IHF-A
VOLOUT=1Vrms
Maximum Attenuation* Vmin - - -90 dB BW=IHF-A VOLOUT=1Vrms
・For measurements marked with *, VP-9690A (Average value wave detection, Effective value display) filter by Matsushita Communication Industrial is used.
・Phase relation between Input/Output signal terminals is the same (Inputs: pin59-64, pin1-4, Outputs: pin32, 33).
・This IC is not designed to be radiation-resistant.
Technical Note
5/18
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BD3401KS2,BD3402KS2
●Control signal s pecifications
1. Signal Timing Conditions
・Data is read on the rising edge of the clock.
・Latch is read on the falling edge of the clock.
・Latch signal must terminate with the LOW state.
・To avoid malfunctions, clock and data sign als must terminate with the LOW state.
1byte=8bit
Fig.1
Parameter Symbol
Limits Unit
Min Typ. Max
Minimum Clock Width twc 2.0 - - µS
Minimum Data Width twd 2.0 - - µS
Minimum Latch Width t w1 2.0 - - µS
Data Set-up Time (DATA→CLK) tsd 1.0 - - µS
Data Hold Time (CLK→DATA) thd 1.0 - - µS
Latch Set-up Time (CLK→LATCH) ts1 1.0 - - µS
Latch Hold Time (DATA→LATCH) th1 1.0 - - µS
Latch Low Set-up Time ts 1.0 - - µS
Latch Low Hold Time th 1.0 - - µS
2. Voltage Conditions for Control Signals
Parameter Symbol Limits Unit
Min Typ Max
“H” Input Voltage Vcc=8 to 9.5V 2.2 - 5.5 V
“L” Input Voltage Vcc=8 to 9.5V 0 - 1.0 V
SC
(CLOCK)
SI
DATA
LATCH
thd thdth ts ts1 th1 tsd
twc
twd
twd tw1
tsu
DATA DATA
LAT CH
90% 90% 90% 90%
10% 10% 10%
90% 90% 90% 90% 90%
10% 10% 10%
twc
Low
Technical Note
6/18
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A
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BD3401KS2,BD3402KS2
●Control data format list
(BD3401KS2)
・Basic Configuration of Control Data Format
←Data input direction
MSB LSB
Data D7 D6 D5 D4 D3 D2 D1 D0
Data Select Address
・Control Data Formats
←Data input direction
Data(1) D7 D6 D5 D4 D3 D2 D1 D0
Input Selector Input Gain 0 0 0
Data(2) D7 D6 D5 D4 D3 D2 D1 D0
Volume 0 0 1
Data(3) D7 D6 D5 D4 D3 D2 D1 D0
T reble TONE
ATT(1) 0 1 0
Data(4) D7 D6 D5 D4 D3 D2 D1 D0
Bass TONE
ATT(2) 0 1 1
Data(5) D7 D6 D5 D4 D3 D2 D1 D0
Middle 0 1 0 0
Data(6) D7 D6 D5 D4 D3
Subwoofer Gain 1 1 0 0
Data(7) D7 D6 D5 D4 D3 D2 D1 D0
MUX MIXING MIXING GAIN 1 0 1
Data(8) D7 D6 D5 D4 D3 D2 D1 D0
PLAY BACK REC LINE MIC 1 1 0
Data(9) D7 D6 D5 D4 D3 D2 D1 D0
Bass
Boost Surround AMS ALC Vocal
Fader 1 1 1
Technical Note
7/18
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A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
(BD3402KS2)
・Basic Configuration of Control Data Format
Data input direction
MSB LSB
Data D7 D6 D5 D4 D3 D2 D1 D0
Data Select Address
・Control Data Formats
Data input direction
Data(1) D7 D6 D5 D4 D3 D2 D1 D0
Input Selector Input Gain 0 0 0
Data(2) D7 D6 D5 D4 D3 D2 D1 D0
Volume 0 0 1
Data(3) D7 D6 D5 D4 D3 D2 D1 D0
T reble TONE
ATT(1) 0 1 0
Data(4) D7 D6 D5 D4 D3 D2 D1 D0
Bass TONE
ATT(2) 0 1 1
Data(5) D7 D6 D5 D4 D3 D2 D1 D0
MUX MIXING MIXING GAIN 1 0 1
Data(6) D7 D6 D5 D4 D3 D2 D1 D0
* REC LINE ALC 1 1 0
・* Indicates 0 or 1.
・By changing the setting of Select Address, nine different control formats are selectable.
・In every power-on sequence, all of the address data must be initialized.
Example:
Data input direction
MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB
Data(1) L Data(2) L Data(3) L Data(4) L ・・・ Data(9) L
“L” means a “latch.”
・After power-on, for the second and subsequent times, only the necessary data can be selected for setting.
Example: When changing the volume,
Data input direction
MSB LSB
Data(2) L
“L” means a “latch.”
Technical Note
8/18
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A
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BD3401KS2,BD3402KS2
・TONE A TT settings
TONE ATT can be set to either one of three modes: 0dB, -4dB and -8dB using D3 in Data (3) or Data (4).
When setting TONE ATT, data should be sent as follows:
(1)TONE ATT=-4dB
(a) Sending Data (3) only
MSB LSB
Data(3) L
(b) Sending all the data
MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB
Data(1) L Data(2) L Data(4) L Data(3) L ・・・ Data(9) L
Sending Data(3) after Data(4) follows that Data(3) is given a higher priority.
(2)TONE ATT=-8dB
(a) Sending Data(4) only
←MSB LSB
Data(4) L
(b) Sending all the data
MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB
Data(1) L Data(2) L Data(3) L Data(4) L ・・・ Data(9) L
Sending Data(4) after Data(3) follows that Data(4) is given a higher priority.
Technical Note
9/18
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BD3401KS2,BD3402KS2
●Pin description
(BD3401KS2)
Pin No. Pin Name Description Pin No. Pin Name Description
1 D1 1ch input pin D 33 VOLOUT1 1ch output pin
2 D2 2ch input pin D 34 BBNF1 1ch bass boost filter setting pin
3 E1 1ch input pin E 35 BBIN1 1ch bass boost filter setting pin
4 E2 2ch input pin E 36 VIN1 1ch volume in put pin
5 PBNF2 2ch PB filter setting pin 37 TONE OUT1 1ch tone output pin
6 PBOUT2 2ch PB output pin 38 VIN2 2ch volume input pin
7 PBOUT1 1ch PB output pin 39 TONE OUT2 2ch tone output pin
8 PBNF1 1ch PB filter setting pin 40 AMS OUT AMS output pin
9 TAPE A1 1ch TAPE input pin A 41 BNF2 2ch bass filter setting pin
10 TAPE A2 2ch TAPE input pin A 42 BOUT2 2ch bass filter setting pin
11 TAPE B1 1ch TAPE input pin B 43 BOUT1 1ch bass filter setting pin
12 TAPE B2 2ch TAPE input pin B 44 BNF1 1ch bass filter setting pin
13 RECNF2 2ch REC filter setting pin 45 MNF1 1ch middle filter setting pin
14 RECOUT2 2ch REC output pin 46 MOUT1 1ch middle filter setting pin
15 RECOUT1 1ch REC output pin 47 MOUT2 2ch middle filter setting pin
16 RECNF1 1ch REC filter setting pin 48 MNF2 2ch middle filter setting pin
17 ALC ALC time constant setting pin 49 TNF2 2ch treble filter setting pin
18 SC Serial clock input pin 50 TNF1 1ch treble filter setting pin
19 SI Serial data input pin 51 SUR1 Surround setting pin
20 VDD Digital power supply pin 52 SUR2 Surround setting pin
21 GND Ground pin 53 LINEOUT2 2chLINE output pin
22 VCC Analog power supply pin 54 LINEOUT1 1chLINE output pin
23 1/2VCC 1/2VCC output pin 55 SAOUT2 Spectrum Analyzer output pin 2
24 FILTER 1/2 VCC pin 56 SAOUT1 Spectrum Analyzer output pin 1
25 SW OUT Subwoofer output pin 57 CAP Time constant setting pin for
absorbing switching shock sound
26 LF4 Primary LPF setting pin 58 MIC MIC input pin A
27 LF3 Secondary LPF setting pin 59 A1 1ch input pin A
28 LF2 Secondary LPF setting pin 60 A2 2ch input pin A
29 LF1 Secondary LPF setting pin 61 B1 1ch input pin B
30 BBIN2 2ch bass boost filter setting pin 62 B2 2ch input pin B
31 BBNF2 2ch bass boost filter setting pin 63 C1 1ch input pin C
32 VOL OUT2 2ch output pin 64 C2 2ch input pin C
Technical Note
10/18
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A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
●Block diagram, a pp lication circuit, pi n assignment
(BD3401KS2)
Fig.2
UNIT
RESISTANCE : Ω
CAPACITANCE : F
12345678910111213
14
64
63
62
61
60
59
58
57
56
55
54
53
52
51
46 45 44 43 42 41 40 39 38 37 36 35 34 33
17
18
19
20
21
22
23
24
25
26
27
28
29
30
15 16
48 47
50
49
31
32
+
DIGITAL
CONTROL
Di-
LIMITER
+
SURROUND
ATT ATT
+
-
+
-+
-
+
-+
-
+
-
+
-
+
-
+
-
+
-
+
+
-
+
-
0
Gfc=100HZ
f
ALC ALC
+
-
+
-
Input
Selector
BUFFER
MIX
MIC MIX
VOCAL FADER
SOFT
SWITCH
+
-
+
-
+
+
-
+
-
+
-
+
-
BASS → MIDDLE → TREBLE
BASS → MIDDLE → TREBLE
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
0.0022µ
0.0022µ
1µ
5.1k
10µ
10µ
10µ
10µ
0.33µ
10µ
10µ
10µ
10µ
10µ
10µ
10µ
10µ 10µ 10µ 10µ
10µ
390k
12k 330k 12k330k
0.01µ 0.01µ 390k
10µ
10µ 10µ 10µ 10µ
10µ
100k
+
4.7k
330p 220p
0.01µ
470k 330k
+
330k 470k
0.01µ
220p 330p
4.7k 100k
10µ
100k
47µ
22µ
47µ
47µ
10µ
0.1µ
0.1µ
10k
10k
10k 10k0.1µ
0.22µ
220k
0.22µ
10µ
680
10µ
680
0.22µ
220k
0.22µ
+
+
10µ10µ10µ
10µ
4.7k
0.1µ
0.1µ
4.7k
10µ
4.7k
1µ
0.01µ
0.01µ 4.7µ
4.7µ
0.01µ 0.01µ
4.7k
1µ
+
22k
22k 4.7k
4.7k 4.7k
4.7k
10k
10k
VDD2 VDD1
4.7k
Technical Note
11/18
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A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
●Pin description
(BD3402KS2)
Pin No. Pin Name Description Pin No. Pin Name Description
1 D1 1ch input pin D 33 VOL OUT1 1ch output pin
2 D2 2ch input pin D 34 NC Non Connection
3 E1 1ch input pin E 35 NC Non Connection
4 E2 2ch input pin E 36 VIN1 1ch volume in put pin
5 PBNF2 2ch PB filter setting pin 37 TONE OUT1 1ch tone output pin
6 PBOUT2 2ch PB output pin 38 VIN2 2ch volume input pin
7 PBOUT1 1ch PB output pin 39 TONE OUT2 2ch tone output pin
8 PBNF1 1ch PB filter setting pin 40 NC Non Connection
9 NC Non Connection 41 BNF2 2ch bass filter setting pin
10 NC Non Connection 42 BOUT2 2ch bass filter setting pin
11 TAPE 1 1ch TAPE input pin 43 BOUT1 1ch bass filter setting pin
12 TAPE 2 2ch TAPE input pin 44 BNF1 1ch bass filter setting pin
13 RECNF2 2ch REC filter setting pin 45 NC Non Connection
14 RECOUT2 2ch REC output pin 46 NC Non Connection
15 RECOUT1 1ch REC output pin 47 NC Non Connection
16 RECNF1 1ch REC filter setting pin 48 NC Non Connection
17 ALC ALC time constant setting pin 49 TNF2 2ch treble filter setting pin
18 SC Serial clock input pin 50 T NF 1 1ch treble filter setting pin
19 SI Serial data input pin 51 NC Non Co nnection
20 VDD Digital power supply pin 52 NC Non Connection
21 GND Ground pin 53 LINEOUT2 2chLINE output pin
22 VCC Analog po wer supply pin 54 LINEOUT1 1chLINE output pin
23 NC Non Connection 55 NC Non Connection
24 FILTER 1/2 VCC pin 56 NC Non Connection
25 NC Non Connection 57 NC Non Connection
26 NC Non Connection 58 NC Non Connection
27 NC Non Connection 59 A1 1ch input pin A
28 NC Non Connection 60 A2 2ch input pin A
29 NC Non Connection 61 B1 1ch input pin B
30 NC Non Connection 62 B2 2ch input pin B
31 NC Non Connection 63 C1 1ch input pin C
32 VOL OUT2 2ch output pin 64 C2 2ch input pin C
Technical Note
12/18
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© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
●Block diagram, a pp lication circuit, pi n assignment
(BD3402KS2)
Fig.3
UNIT
RESISTANCE : Ω
CAPACITANCE : F
1 2 3 4 5 6 7 8 9 10 11 12 13 14
64
63
62
61
60
59
58
57
56
55
54
53
52
51
46 45 44 43 42 41 40 39 38 37 36 35 34 33
17
18
19
20
21
22
23
24
25
26
27
28
29
30
15 16
48 47
50
49
31
32
DIGITAL
CONTROL
ATT ATT
+
-+
-
+
-+
-
+
-
+
-
+
-
+
-
+
-
ALC ALC
+
-
Input
Selector
BUFFER
MIX
+
-
+
-
+
-
+
-
+
-
BASS TREBLE
BASS TREBLE
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
+
+
10µ
0.047µ0.047µ
10µ
10µ10µ
10µ10µ
4.7k 4.7k
47µ
47µ
47µ
22µ
100k
100k
10µ10µ
10µ
390k
390k
10µ
10µ10µ
10µ10µ
10µ
10µ
10µ
10µ
10µ
10µ
10µ
10µ
0.0022µ
0.0022µ
10µ
+
4.7k
330p 220p
470k 330k
+
330k 470k
0.01µ
220p 330p
4.7k 100k
10µ
0.01µ
0.01µ 0.01µ
330k330k 12k12k
NC
NC
Technical Note
13/18
www.rohm.com 2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
0.001
0.01
0.1
1
10
0.001 0.01 0.1 1 10
INPUT VOLTAGE(Vrms)
OUTPUT VOLTAGE(Vrms)
-15
-10
-5
0
5
10
15
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
+8dB(100Hz)
-8dB(100Hz)
-8dB～+8dB
2dB/step
0.001
0.01
0.1
1
10
0.001 0.01 0.1 1 10
OUTPUT VOLTAGE(Vrms)
THD+N(%)
0
5
10
15
20
25
30
35
0246810
VCC(V)
ICC(mA)
Fig.4 Circuit Current - Supply Voltage
(BD3401KS2)
0
5
10
15
20
25
30
35
0246810
VCC(V)
ICC(mA)
Fig.5 Circuit Current - Supply Voltage
(BD3402KS2)
Fig.6 Voltage Gain - Frequency
Fig.7 Output Voltage - Input Voltage Fig.9 Bass Gain - Frequency
(BD3401KS2)
Fig.8 Total Harmonic Distortion ratio
- Output Voltage
-15
-10
-5
0
5
10
15
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
+12dB
(
100Hz
)
-12dB(100Hz)
-12dB～
+12dB
3dB/step
-15
-10
-5
0
5
10
15
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
+8dB(1kHz)
-8dB
(
1kHz
)
-8dB～
+8dB
2dB/step
-15
-10
-5
0
5
10
15
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
+8dB(10kHz)
－
8dB(10kHz)
－8dB～+8dB
2dB/step
Fig.12 Treble Gain - Frequency
Fig.11 Middle Gain – Fr equency
(BD3401KS2)
Fig.10 Bass Gain - Frequency
(BD3402KS2)
-30
-20
-10
0
10
20
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
0
2
4
6
8
10
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
-60
-50
-40
-30
-20
-10
0
10
20
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
0dB
6dB
9dB
12dB
Fig.13 Bass Boost Gain - Frequency
(BD3401KS2)
Fig.14 Surround Gain - Frequency
(BD3401KS2) Fig.15 Subwoofer Gain - Frequency
(BD3401KS2)
●Reference data
-5
-4
-3
-2
-1
0
1
2
3
4
5
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
Technical Note
14/18
www.rohm.com 2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
0
10
20
30
40
50
60
70
80
90
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
0.01
0.1
1
10
0.0001 0.001 0.01
INPUT VOLTAGE(Vrms)
OUTPUT VOLTAGE(Vrms)
0.01
0.1
1
10
0.1 1 10
OUTPUT VOLTAGE(Vrms)
THD+N(%)
Fig.16 Amp Gain - Frequency (PB) F ig.17 Output Voltage – Input Voltage
(PB) Fig.18 Total Harmonic Distortion ratio
- Output Voltage (PB)
-15
-10
-5
0
5
10
15
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
0.001
0.01
0.1
1
10
0.001 0.01 0.1 1 10
INPUT VOLTAGE(Vrms)
OUTPUT VOLTAGE(Vrms)
0.01
0.1
1
10
0.001 0.01 0.1 1
OUTPUT VOLTAGE(Vrms)
THD+N(%)
-20
-10
0
10
20
30
40
10 100 1000 10000 100000
FREQUENCY(Hz)
GAIN(dB)
Fig.19 Amp Gain - Frequency (REC) Fig.20 Output Voltage – Input Voltage
(REC) Fig.21Total Harmonic Distortion ratio
– Output Voltage (REC)
Fig.22 AMS Gain - Frequency
(BD3401KS2)
Technical Note
15/18
www.rohm.com 2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
●Notes for use
1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
2) Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to
verify circuit characteristics for your particular application. Modification of c onstants for other externally connected circuits
may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow
for sufficient margins when determining circuit constants.
3) Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings, such as the applied voltage or ope rating temperat ure range (Topr),
may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode)
when such damage is suffered. A physical safety measure, su ch as a fuse, should be implemented when using the IC at
times where the absolute maximum ratings may be exceeded.
4) GND potential
Ensure a minimum GND pin potenti al in all operating c onditions. Make sure that no pins are at a voltage below the GND
at any time, regardless of whether it is a transient signal or not.
5) Thermal design
Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in
actual states of use.
6) Short circuit between terminals and erroneo us mounting
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other
components on the circuits, can damage the IC.
7) Operation in strong electromagnetic field
Using the ICs in a strong electromagnetic field can cause operatio n malfunction.
8) Serial control
For the SC and SI terminals, the wiring and layout patterns should be routed as not to cause interference with the
analog-signal-related lines.
9) Power ON/OFF
At power ON/OFF, a shock sound will be generated and, therefore, MUTE shall be applied.
10) Start-up sequence of the power supplies
VDD and VCC should be turned on simultaneously or VDD first, followed by VCC.
11) Function switching
(BD3401KS2)
For all functions except Master Volume, Treble, Middle, Bass, Surround, and Bass Boost, MUTE must be applied
during setup.
(BD3402KS2)
For all the functions except Master Volume, Treble and Bass, MUTE must be applied during setup..
12) Power-ON Reset
A built-in circuit for performing initialization inside th e IC at p ower-ON is provided. In unstable s ystems it is recommende d
that the data shall be sent to all the addresses during power-ON, until this operatio n cycle is completed. Mute should be
applied during this cycle.
Function Initial State BD3401KS2 BD3402KS2
Input Selector MUTE ○ ○
Input Gain -5dB ○ ○
Volume 0dB ○ ○
Treble 0dB ○ ○
Bass 0dB ○ ○
Middle 0dB ○ -
TONE ATT 0dB ○ ○
Subwoofer 0dB ○ -
MUX STEREO ○ ○
Mixing OFF ○ ○
Mixing Gain 3dB ○ ○
PLAY BACK TAPE A ○ No selector
REC OFF ○ ○
LINE OFF ○ ○
MIC OFF ○ -
Bass Boost OFF ○ -
Surround OFF ○ -
AMS OFF ○ -
ALC OFF ○ ○
Vocal Fader OFF ○ -
Technical Note
16/18
www.rohm.com 2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
13) Constraints of serial control
(1) On soft-switching of the BASS BOOST, SURROUND and AMS functions, data must not be serially sent to the
functions involved before the switching operation is completed.
Data (1) to (8) can be serially sent immediately after sending Data (9).
Fig.23
(2) When switching AMS ON and OFF, a shock sound will be generated.
Using MUTE provided on VOLUME, control data should be sent in order to avoid outputting the shock soun d
from VOLOUT1,2 (pin32,33) as described in the figure below:
Fig.24
T
Data(9) Data (9)
Direction
For functions that need to use soft-switch, data (Data (9)) can be serially
sent on the same select address.
The time interval: T(sec) between Data (9) must be set to have a suffiecient delay
time. For example, 100ms or more when C on pin57 is 0.33µF.
VOLUME
MUTE
DATA
Direction
AMS
OFF
T2
VOLUME
SETTING
DATA
T1
AMS
ON
AMS OFF ON AMS ON OFF
Time: T1 is an arbitrary number
Time: T2 should be 100ms or more
when C on pin57 is 0.33µF.
Technical Note
17/18
www.rohm.com 2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
●Thermal derating characteristic
Fig.25
When installed on the ROHM standard board
(size: 70×70×1.6mm, Glass epoxy board)
0
200
400
600
800
1000
1200
1400
1600
0 25 50 75 100 125
Ambient Temperature: Ta(℃)
Power Dissipation : Pd （mW)
SQF P-T64
Technical Note
18/18
www.rohm.com 2010.10 - Rev.
A
© 2010 ROHM Co., Ltd. All rights reserved.
BD3401KS2,BD3402KS2
●Ordering part number
B D 3 4 0 1 K S 2
Part No. Part No.
3401,3402 Package
KS2: SQFP-T64 Packaging and forming specification
None: T ray
∗ Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Tray (with dry pack)Container
Quantity
Direction of feed 1000pcs
Direction of product is fixed in a tray
1pin
(Unit : mm)
SQFP-T64
32
64 17
49
48 33
116
0.15
1.4±0.1
14.0±0.3
14.0±0.3
0.5
0.3±0.1
0.125±0.1
12.0±0.2
0.65
12.0±0.2
0.1±0.1
Datasheet
Datasheet
Notice - GE Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
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
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
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 CLASSⅢ CLASSⅡb 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; if flow soldering method is preferred, please consult with the
ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Datasheet
Datasheet
Notice - GE Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
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 our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative 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. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2. 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 information contained in this document.
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.
DatasheetDatasheet
Notice – WE Rev.001
© 2014 ROHM Co., Ltd. All rights reserved.
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.
