ROHM BD37534FV-E2

Sound Processor Series for Car Audio
Sound Processors with Built-in
3-band Equalizer
BD37531FV,BD37532FV,BD37533FV,BD37534FV
No.10085EAT06
●Description
BD37531FV, BD37532FV, BD37533FV, BD37534FV are sound processors built-in 3-band equalizer for car audio. The
functions are stereo input selector available to switch single end input and ground isolation input, input-gain control, main
volume, loudness, 5ch fader volume, LPF for subwoofer(except BD37531FV), mixing input(except BD37531FV,
BD37532FV). Moreover, “Advanced switch circuit”, that is ROHM original technology, can reduce various switching noise
(ex. No-signal, low frequency likes 20Hz & large signal inputs). “Advanced switch” makes control of microcomputer easier,
and can construct high quality car audio system.
●Features
1) Reduce switching noise of input gain control, mute, main volume, fader volume, bass, middle, treble, loudness
by using advanced switch circuit [Possible to control all steps]
2) Built-in differential input selector that can make various combination of single-ended / differential input.
3) Built-in ground isolation amplifier inputs, ideal for external stereo input.
4) Built-in input gain controller reduces switching noise for volume of a portable audio input.
5) Decrease the number of external components by built-in 3-band equalizer filter, LPF for subwoofer (except BD37531FV),
2
loudness filter. And, possible to control Q, Gv, fo of 3-band equalizer and fc of LPF, Gv of loudness by I C BUS control
freely
6) It is possible for the bass, middle, treble to the gain adjustment quantity of ±20dB and 1 dB step gain adjustment.
7) Terminals for the subwoofer outputs are equipped, and the audio signal outputs of front, back and subwoofer can be
chosen with the I2C BUS control.
8) Built-in mixing input, mixing attenuator. (except BD37531FV, BD37532FV)
9) Bi-CMOS process is suitable for the design of low current and low energy. And it provides more quality for small
scale regulator and heat in a set.
10) Package is SSOP-B28. Putting input-terminals together and output-terminals together can make PCB layout easier and
can makes area of PCB smaller.
2
11) It is possible to control by 3.3V / 5V for I C BUS.
●Applications
It is the optimal for the car audio. Besides, it is possible to use for the audio equipment of mini Compo, micro Compo, TV
etc with all kinds.
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© 2010 ROHM Co., Ltd. All rights reserved.
1/37
2010.03 - Rev.A
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●
Technical Note
Line up matrix
Function BD37531FV BD37532FV BD37533FV BD37534FV
Input
selector
○
○
○
○
Input
gain
○
○
○
○
Mute
○
○
○
○
Volume
○
○
○
○
Bass
○
○
○
○
Middle
○
○
○
○
Treble
○
○
○
○
Fader
○
○
○
○
Loudness
○
○
○
○
LPF
×
○
○
○
Mixing
×
×
○
○
Level
meter
×
×
×
○
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© 2010 ROHM Co., Ltd. All rights reserved.
Specifications
・(Stereo input)
・Single-End/Diff/Full-Diff
(Possible to set the number of single-end/diff/full-diff as
follows )
Single-End
Differential
Full-Differential
Mode 1
0
3
1
Mode 2
1
2
1
Mode 3
3
1
1
Mode 4
4
0
1
Mode 5
5
1
0
Mode 6
6
0
0
Table.1 Combination of input selector
・0～20dB（1dB step）
・Possible to use “Advanced switch” for prevention of switching
noise.
・Possible to use “Advanced switch” for prevention of switching
noise.
・+15dB～-79dB（1dB step）, -∞
・Possible to use “Advanced switch” for prevention of switching
noise.
・-20～+20dB（1dB step）
・Q=0.5, 1, 1.5, 2
・fo=60, 80, 100, 120Hz
・Possible to use “Advanced switch” at changing gain
・-20～+20dB（1dB step）
・Q=0.75, 1, 1.25, 1.5
・fo=500, 1k, 1.5k 2.5kHz
・Possible to use “Advanced switch” at changing gain
・-20～+20dB（1dB step）
・Q=0.75, 1.25
・fo=7.5k, 10k, 12.5k, 15kHz
・Possible to use “Advanced switch” at changing gain
・+15dB～-79dB(1dB step), -∞dB
(BD37531FV : 0dB～-79dB, -∞dB)
・Possible to use “Advanced switch” for prevention of switching
noise.
・0dB～20dB(1dB step)
・fo=250/400/800Hz
・Possible to use “Advanced switch” for prevention of switching
noise.
・fc=55/85/120/160Hz, pass
・Phase shift (0°/180°)
・Monaural input
・+7dB～-79dB（1dB step）, -∞
・Possible to use “Advanced switch” for prevention of switching
noise.
・I2C BUS control
・DC Output
2/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Absolute maximum ratings (Ta=25℃)
Item
Symbol
Rating
Unit
Power supply Voltage
VCC
10.0
V
Input voltage
Vin
VCC+0.3～GND-0.3
V
Power Dissipation
Pd
1063 ※1
mW
Storage Temperature
Tastg
-55～+150
℃
※This value decreases 8.5mW/℃ for Ta=25℃ or more.
ROHM standard board shall be mounted.
Thermal resistance θja = 117.6(℃/W)
ROHM Standard board
Size：70×70×1.6(㎣)
Material：A FR4 grass epoxy board(3% or less of copper foil area)
●Operating conditions
Item
Symbol
MIN
TYP
MAX
Unit
Power supply Voltage
VCC
7.0
－
9.5
V
Temperature
Topr
-40
－
+85
℃
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© 2010 ROHM Co., Ltd. All rights reserved.
3/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
GENERAL
BLOCK
●Electrical characteristics
(Unless specified particularly, Ta=25℃, VCC=8.5V, f=1kHz, Vin=1Vrms, Rg=600Ω, RL=10kΩ, A1 input, Input gain 0dB,
Mute off, Volume 0dB, Tone control 0dB, Loudness 0dB, LPF OFF(BD37532FV,BD37533FV,BD37534FV),
Mixing OFF(BD37533FV,BD37534FV), Fader 0dB)
Limit
Item
Symbol
Unit
Condition
Min.
Typ.
Max.
IQ
GV
CB
－
-1.5
-1.5
38
0
0
48
1.5
1.5
mA
dB
dB
THD+N1
－
0.001
0.05
％
THD+N2
－
0.002
0.05
％
VNO1
－
3.8
15
μVrms
VNO2
－
4.8
15
μVrms
Residual output noise voltage＊
VNOR
－
1.8
10
μVrms
Cross-talk between channels＊
CTC
－
-100
-90
dB
RR
－
-70
-40
dB
RIN_S
RIN_D
70
175
100
250
130
325
kΩ
kΩ
VIM
2.1
2.3
－
Vrms
CTS
－
-100
-90
dB
Common mode rejection ratio ＊
(D, E)
CMRR
50
65
－
dB
Minimum input gain
GIN MIN
-2
0
+2
dB
Maximum input gain
GIN MAX
+18
+20
+22
dB
Gain set error
GIN ERR
-2
0
+2
dB
Mute attenuation＊
GMUTE
－
-105
-85
dB
Maximum gain
GV MAX
13
15
17
dB
Maximum attenuation＊
GV MIN
－
-100
-85
dB
Attenuation set error 1
Attenuation set error 2
Attenuation set error 3
GV ERR1
GV ERR2
GV ERR3
-2
-3
-4
0
0
0
2
3
4
dB
dB
dB
Current upon no signal
Voltage gain
Channel balance
Total harmonic distortion 1
(FRONT,REAR)
Total harmonic distortion 2
(SUBWOOFER)
Output noise voltage 1
(FRONT,REAR)＊
Output noise voltage 2
(SUBWOOFER)＊
Ripple rejection
VOLUME
MUTE
INPUT GAIN
INPUT SELECTOR
Input impedance(A, B, C)
Input impedance (D, E)
Maximum input voltage
Cross-talk between selectors
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© 2010 ROHM Co., Ltd. All rights reserved.
4/37
No signal
Gv=20log(VOUT/VIN)
CB = GV1-GV2
VOUT=1Vrms
BW=400-30KHz
VOUT=1Vrms
BW=400-30KHz
Rg = 0Ω
BW = IHF-A
Rg = 0Ω
BW = IHF-A
Fader = -∞dB
Rg = 0Ω
BW = IHF-A
Rg = 0Ω
CTC=20log(VOUT/VIN)
BW = IHF-A
f=1kHz
VRR=100mVrms
RR=20log(VCC IN/VOUT)
VIM at THD+N(VOUT)=1％
BW=400-30KHz
Rg = 0Ω
CTS=20log(VOUT/VIN)
BW = IHF-A
XP1 and XN input
XP2 and XN input
CMRR=20log(VIN/VOUT)
BW = IHF-A,[※X・・・D,E]
Input gain 0dB
VIN=100mVrms
Gin=20log(VOUT/VIN)
Input gain +20dB
VIN=100mVrms
Gin=20log(VOUT/VIN)
GAIN=+20～+1dB
Mute ON
Gmute=20log(VOUT/VIN)
BW = IHF-A
Volume = 15dB
VIN=100mVrms
Gv=20log(VOUT/VIN)
Volume = -∞dB
Gv=20log(VOUT/VIN)
BW = IHF-A
GAIN & ATT=+15dB～-15dB
ATT=-16dB～-47dB
ATT=-48dB～-79dB
2010.03 - Rev.A
Technical Note
BLOCK
BD37531FV,BD37532FV,BD37533FV,BD37534FV
FADER / SUBWOOFER
MIXING
(BD37533FV,BD37534FV)
TREBLE
MIDDLE
BASS
Item
Limit
Typ.
Max.
Unit
Condition
Gain=+20dB f=100Hz
VIN=100mVrms
GB=20log (VOUT/VIN)
Gain=-20dB f=100Hz
VIN=2Vrms
GB=20log (VOUT/VIN)
Gain=-20～+20dB f=100Hz
Gain=+20dB f=1kHz
VIN=100mVrms
GM=20log (VOUT/VIN)
Gain=-20dB f=1kHz
VIN=2Vrms
GM=20log (VOUT/VIN)
Gain=-20～+20dB f=1kHz
Gain=+20dB f=10kHz
VIN=100mVrms
GT=20log (VOUT/VIN)
Gain=-20dB f=10kHz
VIN=2Vrms
GT=20log (VOUT/VIN)
Gain=-20～+20dB f=10kHz
GB BST
18
20
22
dB
Maximum cut gain
GB CUT
-22
-20
-18
dB
Gain set error
GB ERR
-2
0
2
dB
Maximum boost gain
GM BST
18
20
22
dB
Maximum cut gain
GM CUT
-22
-20
-18
dB
Gain set error
GM ERR
-2
0
2
dB
Maximum boost gain
GT BST
17
20
23
dB
Maximum cut gain
GT CUT
-23
-20
-17
dB
Gain set error
Input impedance
GT ERR
RIN_M
-2
19
0
27
2
35
dB
kΩ
Maximum input voltage
VIM_M
2.0
2.2
－
Vrms
Maximum attenuation
GMX MIN
－
-100
-85
dB
Maximum gain
GMX MAX
5
7
9
dB
Maximum boost gain
(BD37532FV,BD37533FV,BD37534FV)
GF BST
13
15
17
dB
Maximum attenuation＊
GF MIN
－
-100
-90
dB
GF ERR
-2
0
2
dB
Gain=+1～+15dB
GF ERR1
GF ERR2
GF ERR3
ROUT
-2
-3
-4
-
0
0
0
－
2
3
4
50
dB
dB
dB
Ω
VOM
2
2.2
－
Vrms
Maximum gain
GL MAX
17
20
23
dB
Gain set error
GL ERR
-2
0
2
dB
ATT=-1～-15dB
ATT=-16～-47dB
ATT=-48～-79dB
VIN=100mVrms
THD+N=1％
BW=400-30KHz
Gain 20dB
VIN=100mVrms
GL=20log(VOUT/VIN)
GAIN=+20～+1dB
Maximum output voltage
VL MAX
2.8
3.1
3.5
V
Output offset voltage
VL OFF
-
0
100
mV
Maximum output voltage
LOUDNESS
Min.
Maximum boost gain
Gain set error
(BD37532FV,BD37533FV,BD37534FV)
Attenuation set error 1
Attenuation set error 2
Attenuation set error 3
Output impedance
Level meter
(BD37534FV)
Symbol
VIM at THD+N(VOUT)=1％
BW=400-30KHz
MIX=OFF
GMX=20log(VOUT/VIN)
BW=INF-A
ATT=+6dB
GMX=20log(VOUT/VIN)
Fader=15dB
VIN=100mVrms
GF=20log(VOUT/VIN)
Fader = -∞dB
GF=20log(VOUT/VIN)
BW = IHF-A
VP-9690A(Average value detection, effective value display) filter by Matsushita Communication is used for ＊ measurement.
Phase between input / output is same.
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© 2010 ROHM Co., Ltd. All rights reserved.
5/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Electrical characteristic curves (Reference data)
THD+N(%
1
30
THD+N[%]
Iq[mA]
40
20
10
10kHz
10
5
1
4
3
1kHz
100Hz
0.1
0.1
0.01
0.01
2
Gain[dB]
Gain(dB
10
Vin[Vrms]
Vou
50
Gain=0dB
1
0
-110
-2
100
1k
10k
100k
-3
0
0
2
4
6
8
0.001
0.001
10
0.01
VCC[V]
100k
25
20
15
10
5
0
-5
-10
-15
-20
-25
10
25
20
fo : 60/80/100/120Hz
BASS GAIN : ±20dB
Q : 0.5
100
1k
10k
Frequency [Hz]
100k
15
10
5
0
-5
-10
-15
-20
-25
10
Fig.5 Bass fo vs Freq
25
20
MIDDLE GAIN :
-20～+20dB /1dB step
Gain[dB]
Gain[dB]
Fig.4 Bass Gain vs Freq
fo : 500Hz
Q : 0.75
100
1k
10k
Frequency [Hz]
Fig.12
Fig.3 Gain
Gain vs
vs Freq
Freq
fo : 500/1k/1.5k/2.5kHz
15
10
5
0
-5
-10
-15
-20
-25
10
100k
100
1k
10k
Q : 0.5/1/1.5/2
BASS GAIN : ±20dB
fo : 60Hz
100
1k
10k
Frequency [Hz]
25
20
15
10
5
0
-5
-10
-15
-20
-25
Q : 0.75/1/1.25/1.5
MIDDLE GAIN :
±20dB
fo : 500Hz
10
100k
100
20
fo : 7.5k/10k/12.5k/15kHz
TREBLE GAIN : ±20dB
Q : 0.75
15
1k
10k
100k
Frequency [Hz]
Frequency (Hz)
Fig.10 Treble Gain vs Freq
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© 2010 ROHM Co., Ltd. All rights reserved.
Q : 0.75/1.25
TREBLE GAIN : ±20dB
fo : 7.5kHz
15
Gain[dB]
Gain (dB)
5
0
-5
-10
10
5
0
-5
-10
-15
-15
-20
100
100k
Fig.9 Middle Q vs Freq
10
10
10k
25
20
TREBLE GAIN:-20～+20dB
/1dB step
fo : 7.5kHz Q : 0.75
Gain[dB]
Gain[dB]
Gain (dB)
Fig.8 Middle fo vs Freq
25
25
20
15
10
5
0
-5
-10
-15
-20
-25
1k
Frequency [Hz]
Frequency [Hz]
Fig.7 Middle Gain vs Freq
100k
Fig.6 Bass Q vs Freq
Gain[dB]
100
1k
10k
Frequency [Hz]
25
20
15
10
5
0
-5
-10
-15
-20
-25
10
Frequency [Hz]
Frequency(Hz)
Gain[dB]
Gain[dB]
Gain[dB]
-20
-25
10
-4
-5
Vout (V
Fig.2 Thd
vs) Vo
BASS GAIN : -20～+20dB
/1dB step
fo : 60Hz Q : 0.5
15
10
5
0
-5
-10
-15
1
Vout [Vrms]
Fig.1 Iq vs Vcc
25
20
0.1
0.001
10
-20
-25
-25
10
100
1k
10k
100k
Frequency [Hz]
Fig.11 Treble fo vs Freq
6/37
10
100
1k
10k
100k
Frequency [Hz]
Frequency (Hz)
Fig.12Treble Q vs Freq
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
100
10
IHF-A
100
10
1
-80 -70 -60 -50 -40 -30 -20 -10 0
10 20
-20 -15 -10 -5
Volume Gain[dB]
0
5
-20 -15 -10 -5 0 5 10 15 20
Middle Gain [dB]
Fig.15 Middle Gain vs Noise
0
2.5
Vo [Vrms]
最大出力[Vrms]
Gain[dB]
Gain
(dB
10
-20
-30
-40
-50
-60
1
-20 -15 -10 -5 0 5 10 15 20
Treble Gain [dB]
Fig.16 Treble Gain vs Noise
10
-10
IHF-A
100
IHF-A
100
Bass Gain [dB]
1000
DIN-Audio
DIN-Audio
1
10 15 20
Fig.14 Bass Gain vs Noise
Fig.13 Volume Gain vs Noise
-70
10
2.0
1.5
1.0
0.5
0.0
100
1k
10k
100k
100
1000
10000
Rload [ohm]
出力負荷[ohm]
Frequency [Hz]
Frequency(Hz)
Fig.17
CMRR vs Freq
100000
Fig.18 Rload vs Vo
3.5
3
2.5
2
Vout[V]
Output Noise[uVrms]
DIN-Audio
出力雑音電圧
Output Noise[uVrms]
[uVrms]
IHF-A
1
出力雑音電圧 [uVrms]
1000
1000
Din-Audio
Output Noise[uVrms]
出力雑音電圧
[uVrms]
出力雑音電圧[uVrms]
Output Noise[uVrms]
1000
1.5
1
0.5
0
0
Fig.19 Advanced Switch 1
Fig.20 Advanced Switch 2
0.5
1
1.5
2
Vin [Vrms]
2.5
3
Fig.21 Level Meter Vin vs Vo
Fig.21 : Level Meter function is available only BD37534FV
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© 2010 ROHM Co., Ltd. All rights reserved.
7/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Block diagram and pin configuration
26
25
24
23
22
21
Fader★
27
Fader★
28
20
19
18
17
16
15
VCC
VCC/2
GND
I2C BUS LOGIC
Fader★
Fader★
Fader★
■Fader
Gain:0dB～-79ｄB/1dB step
★no pop noise
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
100k
3
100k
4
100k
5
100k
6
GND
ISO amp
250k
250k
7
8
GND
ISO amp
250k
9
250k
10
GND
ISO amp
250k
11
250k
12
250k
13
14
Fig.22 BD37531FV
Descriptions of terminal
Terminal
Terminal
No.
Name
1
A1
A input terminal of 1ch
Terminal
No.
15
2
A2
A input terminal of 2ch
16
TEST2
Test Pin
3
B1
B input terminal of 1ch
17
TEST3
Test Pin
4
B2
B input terminal of 2ch
18
OUTS2
Subwoofer output terminal of 2ch
5
C1
C input terminal of 1ch
19
OUTS1
Subwoofer output terminal of 1ch
6
C2
C input terminal of 2ch
20
OUTR2
Rear output terminal of 2ch
7
DP1
D positive input terminal of 1ch
21
OUTR1
Rear output terminal of 1ch
8
DN
D negative input terminal
22
OUTF2
Front output terminal of 2ch
Front output terminal of 1ch
Description
Terminal
Name
MUTE
Description
External compulsory mute terminal
9
DP2
D positive input terminal of 2ch
23
OUTF1
10
EP1
E positive input terminal of 1ch
24
VCC
Power supply terminal
11
EN1
E negative input terminal of 1ch
25
SCL
I2C Communication clock terminal
12
EN2
E negative input terminal of 2ch
26
SDA
I2C Communication data terminal
13
EP2
E positive input terminal of 2ch
27
GND
GND terminal
14
TEST1
Test Pin
28
FIL
VCC/2 terminal
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© 2010 ROHM Co., Ltd. All rights reserved.
8/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
24
23
22
21
20
Fader★
25
Fader★
26
Fader★
27
Fader★
28
19
18
17
16
15
VCC
VCC/2
GND
I2C BUS LOGIC
Fader★
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
100k
3
100k
4
100k
5
100k
6
GND
ISO amp
250k
250k
7
8
GND
ISO amp
250k
9
250k
10
GND
ISO amp
250k
11
250k
12
250k
13
14
Fig.23 BD37532FV
Descriptions of terminal
Terminal
Terminal
No.
Name
1
A1
A input terminal of 1ch
Terminal
No.
15
2
A2
A input terminal of 2ch
16
TEST2
Test Pin
3
B1
B input terminal of 1ch
17
TEST3
Test Pin
4
B2
B input terminal of 2ch
18
OUTS2
Subwoofer output terminal of 2ch
5
C1
C input terminal of 1ch
19
OUTS1
Subwoofer output terminal of 1ch
6
C2
C input terminal of 2ch
20
OUTR2
Rear output terminal of 2ch
7
DP1
D positive input terminal of 1ch
21
OUTR1
Rear output terminal of 1ch
8
DN
D negative input terminal
22
OUTF2
Front output terminal of 2ch
Front output terminal of 1ch
Description
Terminal
Name
MUTE
Description
External compulsory mute terminal
9
DP2
D positive input terminal of 2ch
23
OUTF1
10
EP1
E positive input terminal of 1ch
24
VCC
Power supply terminal
11
EN1
E negative input terminal of 1ch
25
SCL
I2C Communication clock terminal
12
EN2
E negative input terminal of 2ch
26
SDA
I2C Communication data terminal
13
EP2
E positive input terminal of 2ch
27
GND
GND terminal
14
TEST1
Test Pin
28
FIL
VCC/2 terminal
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9/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
24
23
22
21
20
Fader★
25
Fader★
26
Fader★
27
Fader★
28
19
18
17
16
15
VCC
VCC/2
GND
I2C BUS LOGIC
ATT★
Fader★
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
100k
3
100k
4
100k
5
100k
6
GND
ISO amp
250k
250k
7
8
GND
ISO amp
250k
9
250k
10
GND
ISO amp
250k
11
250k
12
250k
13
14
Fig.24 BD37533FV
Descriptions of terminal
Terminal
Terminal
No.
Name
1
A1
A input terminal of 1ch
Terminal
No.
15
2
A2
A input terminal of 2ch
16
TEST1
Test Pin
3
B1
B input terminal of 1ch
17
TEST2
Test Pin
4
B2
B input terminal of 2ch
18
OUTS2
Subwoofer output terminal of 2ch
5
C1
C input terminal of 1ch
19
OUTS1
Subwoofer output terminal of 1ch
6
C2
C input terminal of 2ch
20
OUTR2
Rear output terminal of 2ch
7
DP1
D positive input terminal of 1ch
21
OUTR1
Rear output terminal of 1ch
8
DN
D negative input terminal
22
OUTF2
Front output terminal of 2ch
Front output terminal of 1ch
Description
Terminal
Name
MUTE
Description
External compulsory mute terminal
9
DP2
D positive input terminal of 2ch
23
OUTF1
10
EP1
E positive input terminal of 1ch
24
VCC
Power supply terminal
11
EN1
E negative input terminal of 1ch
25
SCL
I2C Communication clock terminal
12
EN2
E negative input terminal of 2ch
26
SDA
I2C Communication data terminal
13
EP2
E positive input terminal of 2ch
27
GND
GND terminal
14
MIN
Mixing input terminal
28
FIL
VCC/2 terminal
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10/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
24
23
22
21
20
Fader★
25
Fader★
26
Fader★
27
Fader★
28
19
18
17
16
15
VCC
VCC/2
GND
I2C BUS LOGIC
ATT★
Fader★
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
Level meter
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
100k
3
100k
4
100k
5
100k
6
GND
ISO amp
250k
7
250k
8
GND
ISO amp
250k
9
250k
10
GND
ISO amp
250k
11
250k
12
250k
13
14
Fig.25 BD37534FV
Descriptions of terminal
Terminal
Terminal
No.
Name
1
A1
A input terminal of 1ch
Terminal
No.
15
2
A2
A input terminal of 2ch
16
3
B1
B input terminal of 1ch
17
LOUT
Output terminal for Level meter
4
B2
B input terminal of 2ch
18
OUTS2
Subwoofer output terminal of 2ch
5
C1
C input terminal of 1ch
19
OUTS1
Subwoofer output terminal of 1ch
6
C2
C input terminal of 2ch
20
OUTR2
Rear output terminal of 2ch
7
DP1
D positive input terminal of 1ch
21
OUTR1
Rear output terminal of 1ch
8
DN
D negative input terminal
22
OUTF2
Front output terminal of 2ch
Front output terminal of 1ch
Description
Terminal
Name
MUTE
LRST
Description
External compulsory mute terminal
Level meter reset terminal
9
DP2
D positive input terminal of 2ch
23
OUTF1
10
EP1
E positive input terminal of 1ch
24
VCC
Power supply terminal
11
EN1
E negative input terminal of 1ch
25
SCL
I2C Communication clock terminal
12
EN2
E negative input terminal of 2ch
26
SDA
I2C Communication data terminal
13
EP2
E positive input terminal of 2ch
27
GND
GND terminal
14
MIN
Mixing input terminal
28
FIL
VCC/2 terminal
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11/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Timming Chart
CONTROL SIGNAL SPECIFICATION
(１) Electrical specifications and timing for bus lines and I/O stages
SDA
t
BUF
t
t
LOW
t
R
t
F
HD;STA
t
SP
SCL
t
HD;STA
P
t
HD;DAT
t
HIGH
t
SU;DAT
t
SU;STA
t
SU;STO
Sr
S
P
Fig.26
Definition of timing on the I2C-bus
2
Table 1 Characteristics of the SDA and SCL bus lines for I C-bus devices
(Unless specified particularly, Ta=25℃, VCC=8.5V)
Parameter
1
2
3
4
5
6
7
8
9
Symbol
SCL clock frequency
Bus free time between a STOP and START condition
Hold time (repeated) START condition. After this period, the first
clock pulse is generated
LOW period of the SCL clock
HIGH period of the SCL clock
Set-up time for a repeated START condition
Data hold time:
Data set-up time
Set-up time for STOP condition
ｆSCL
tBUF
Fast-mode I2C-bus
Min.
Max.
400
0
1.3
－
Unit
kHz
μS
tHD;STA
0.6
－
μS
tLOW
tHIGH
tSU;STA
tHD;DAT
tSU;DAT
tSU;STO
1.3
0.6
0.6
0.06*
120
0.6
－
－
－
－
－
－
μS
μS
μS
μS
ns
μS
All values referred to VIH min. and VIL max. Levels (see Table 2).
* A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the VIH min. of the SCL
signal) in order to bridge the undefined region of the falling edge of SCL.
About 7(tHD;DAT), 8(tSU;DAT), make it the setup which a margin is fully in .
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12/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Table 2
2
Characteristics of the SDA and SCL I/O stages for I C-bus devices
Parameter
10
11
12
13
14
Symbol
LOW level input voltage:
HIGH level input voltage:
Pulse width of spikes which must be suppressed by the input filter.
LOW level output voltage: at 3mA sink current
Input current each I/O pin with an input voltage between 0.4V and
4.5V.
ｔHD;STA
：2us
ｔHD;DAT
：1us
VIL
VIH
tSP
VOL1
ｔSU;DAT
：1us
Ii
Fast-mode devices
Min.
Max.
-0.3
1
2.3
5
0
50
0
0.4
-10
10
Unit
V
V
ns
V
μA
ｔSU;STO
：2us
SCL
ｔBUF
：4us
ｔLOW
：3us
ｔHIGH
：1us
SDA
SCL clock frequency：250kHz
Fig.27 A command timing example in the I2C data transmission
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13/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
（２）I2C BUS FORMAT
MSB
S
1bit
LSB
Slave Address
8bit
S
Slave Address
MSB
LSB
MSB
LSB
A
Select Address
A
Data
A
P
1bit
8bit
1bit
8bit
1bit 1bit
= Start conditions (Recognition of start bit)
= Recognition of slave address. 7 bits in upper order are voluntary.
The least significant bit is “L” due to writing.
A
= ACKNOWLEDGE bit (Recognition of acknowledgement)
Select Address = Select every of volume, bass and treble.
Data
= Data on every volume and tone.
P
= Stop condition (Recognition of stop bit)
（３）I2C BUS Interface Protocol
1）Basic form
S
Slave Address
MSB
LSB
A
MSB
Select Address
LSB
A
MSB
Data
LSB
A
P
2）Automatic increment (Select Address increases (+1) according to the number of data.
S
Slave Address
A
Select Address
A
Data1
A
Data2
A ････
DataN
A
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
（Example）①Data1 shall be set as data of address specified by Select Address.
②Data2 shall be set as data of address specified by Select Address +1.
③DataN shall be set as data of address specified by Select Address +N-1.
P
3）Configuration unavailable for transmission (In this case, only Select Address1 is set.
S Slave Address A Select Address1 A Data
A Select Address 2 A Data
A P
MSB
LSB MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
（Note）If any data is transmitted as Select Address 2 next to data, it is
recognized as data, not as Select Address 2.
（４）Slave address
MSB
A6
1
A5
0
A4
0
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© 2010 ROHM Co., Ltd. All rights reserved.
A3
0
A2
0
A1
0
14/37
A0
0
LSB
R/W
0
80H
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
（５）Select Address & Data
BD37531FV
Items
Select
Address
(hex)
Initial setup 1
01
Initial setup 2
MSB
Data
D7
Advanced
switch
ON/OFF
D6
02
0
0
Initial setup 3
03
0
Input Selector
05
Input gain
06
0
Full-diff
Type
Mute
ON/OFF
Volume gain
Fader 1ch Front
Fader 2ch Front
Fader 1ch Rear
Fader 2ch Rear
Fader Subwoofer
Test Mode
Bass setup
Middle setup
Treble setup
20
28
29
2A
2B
2C
30
41
44
47
Bass gain
51
Middle gain
54
Treble gain
57
Loudness Gain
System Reset
75
FE
1
0
0
0
Bass
Boost/
Cut
Middle
Boost/
Cut
Treble
Boost/
Cut
0
1
0
LSB
D5
D4
D3
Advanced switch time
of Input Gain/Volume
0
Tone/Fader/Loudness
Subwoofer Output
0
Select
0
Loudness fo
D2
D1
Advanced switch time
of Mute
1
0
0
0
0
0
1
0
0
Input selector
0
0
Input Gain
1
0
0
0
Volume Gain / Attenuation
Fader Attenuation
Fader Attenuation
Fader Attenuation
Fader Attenuation
Fader Attenuation
1
1
1
Bass fo
0
Middle fo
0
Treble fo
0
0
0
Bass Gain
0
0
Middle Gain
0
0
Treble Gain
Loudness Hicut
0
0
0
0
D0
1
0
0
0
1
1
Bass Q
Middle Q
0
Treble Q
Loudness Gain
0
0
1
Advanced switch
Note
１．In function changing of the hatching part, it works Advanced switch.
２．Upon continuous data transfer, the Select Address is circulated by the automatic increment function, as
shown below.
→01→02→03→05→06→20→28→29→2A→2B→2C
→30→41→44→47→51→54→57→75
３．For the function of input selector and subwoofer output select etc, it is not corresponded for advanced switch.
Therefore, please apply mute on the side of a set when changes these setting.
４．When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting
advanced-mute time.
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15/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
BD37532FV
Items
Select
Address
(hex)
Initial setup 1
01
Initial setup 2
02
Initial setup 3
03
Input Selector
05
Input gain
06
Volume gain
Fader 1ch Front
Fader 2ch Front
Fader 1ch Rear
Fader 2ch Rear
Fader Subwoofer
Test Mode
Bass setup
Middle setup
Treble setup
20
28
29
2A
2B
2C
30
41
44
47
Bass gain
51
Middle gain
54
Treble gain
57
Loudness Gain
System Reset
75
FE
MSB
D7
Advanced
switch
ON/OFF
LPF
Phase
0
Full-diff
Type
Mute
ON/OFF
1
0
0
0
Bass
Boost/
Cut
Middle
Boost/
Cut
Treble
Boost/
Cut
0
1
Data
D6
0
0
0
LSB
D5
D4
D3
Advanced switch time
of Input Gain/Volume
0
Tone/Fader/Loudness
Subwoofer Output
0
Select
0
Loudness fo
D2
D1
Advanced switch time
of Mute
1
Subwoofer LPF fc
0
0
0
0
Input selector
0
0
Input Gain
1
0
0
0
Volume Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
1
1
1
Bass fo
0
Middle fo
0
Treble fo
0
0
0
Bass Gain
0
0
Middle Gain
0
0
Treble Gain
Loudness Hicut
0
0
0
0
D0
1
0
0
0
1
1
1
Bass Q
Middle Q
0
Treble Q
Loudness Gain
0
0
1
Advanced switch
Note
１．In function changing of the hatching part, it works Advanced switch.
２．Upon continuous data transfer, the Select Address is circulated by the automatic increment function, as
shown below.
→01→02→03→05→06→20→28→29→2A→2B→2C
→30→41→44→47→51→54→57→75
３．For the function of input selector and subwoofer output select etc, it is not corresponded for advanced switch.
Therefore, please apply mute on the side of a set when changes these setting.
４．When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting
advanced-mute time.
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16/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
BD37533FV
Items
Select
Address
(hex)
Initial setup 1
01
Initial setup 2
02
Initial setup 3
03
Input Selector
05
Input gain
06
Volume gain
Fader 1ch Front
Fader 2ch Front
Fader 1ch Rear
Fader 2ch Rear
Fader Subwoofer
Mixing
Bass setup
Middle setup
Treble setup
20
28
29
2A
2B
2C
30
41
44
47
Bass gain
51
Middle gain
54
Treble gain
57
Loudness Gain
System Reset
75
FE
MSB
Data
D7
D6
Advanced
switch
ON/OFF
0
LPF
Phase
0
Full-diff
Type
Mute
ON/OFF
0
0
0
Bass
Boost/
Cut
Middle
Boost/
Cut
Treble
Boost/
Cut
0
1
0
0
LSB
D5
D4
D3
Advanced switch time
of Input Gain/Volume
0
Tone/Fader/Loudness
/Mixing
Subwoofer Output
0
Select
0
Loudness fo
D2
D1
Advanced switch time
of Mute
1
Subwoofer LPF fc
0
0
0
0
Input selector
0
0
Input Gain
Volume Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Mixing Gain / Attenuation
Bass fo
0
Middle fo
0
Treble fo
0
0
0
0
0
0
0
0
Bass Gain
0
0
Middle Gain
0
0
Treble Gain
0
0
1
Bass Q
Middle Q
0
Treble Q
0
Loudness Hicut
0
0
D0
Loudness Gain
0
0
1
Advanced switch
Note
１．In function changing of the hatching part, it works Advanced switch.
２．Upon continuous data transfer, the Select Address is circulated by the automatic increment function, as
shown below.
→01→02→03→05→06→20→28→29→2A→2B→2C
→30→41→44→47→51→54→57→75
３．For the function of input selector and subwoofer output select etc, it is not corresponded for advanced switch.
Therefore, please apply mute on the side of a set when changes these setting.
４．When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting
advanced-mute time.
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17/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
BD37534FV
Items
Select
Address
(hex)
Initial setup 1
MSB
Data
D7
D6
01
Advanced
switch
ON/OFF
0
Initial setup 2
02
LPF
Phase
Initial setup 3
03
Input Selector
05
Input gain
06
Volume gain
Fader 1ch Front
Fader 2ch Front
Fader 1ch Rear
Fader 2ch Rear
Fader Subwoofer
Mixing
Bass setup
Middle setup
Treble setup
20
28
29
2A
2B
2C
30
41
44
47
Bass gain
51
Middle gain
54
Treble gain
57
Loudness Gain
System Reset
75
FE
0
Full-diff
Type
Mute
ON/OFF
0
0
0
Bass
Boost/
Cut
Middle
Boost/
Cut
Treble
Boost/
Cut
0
1
Level
Meter
RESET
0
D5
D4
Advanced switch time
of Input Gain/Volume
Tone/Fader/Loudness
/Mixing
Subwoofer Output
Select
0
LSB
D3
D2
0
1
0
D1
Advanced switch time
of Mute
Subwoofer LPF fc
Loudness fo
0
0
0
0
Input selector
0
0
Input Gain
Volume Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Fader Gain / Attenuation
Mixing Gain / Attenuation
Bass fo
0
Middle fo
0
Treble fo
0
0
0
0
0
0
0
0
0
Bass Gain
0
0
Middle Gain
0
0
Treble Gain
Loudness Hicut
0
0
0
0
D0
Loudness Gain
0
1
Bass Q
Middle Q
0
Treble Q
0
1
Advanced switch
Note
１．In function changing of the hatching part, it works Advanced switch.
２．Upon continuous data transfer, the Select Address is circulated by the automatic increment function, as
shown below.
→01→02→03→05→06→20→28→29→2A→2B→2C
→30→41→44→47→51→54→57→75
３．For the function of input selector and subwoofer output select etc, it is not corresponded for advanced switch.
Therefore, please apply mute on the side of a set when changes these setting.
４．When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting
advanced-mute time.
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18/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Select address 01 (hex)
MSB
D7
Advanced switch time
D6
D5
D4
D3
0.6msec
Advanced switch time
Advanced
1.0msec
of Input gain/Volume
Switch
0
0
Tone/Fader/Loudness
1.4msec
ON/OFF
/Mixing
3.2msec
(Mixing is available only BD37533FV, BD37534FV)
Time
of
D2
1
Mute
D1
0
0
1
1
LSB
D0
0
1
0
1
Advanced switch time of Input
LSB
gain/Volume/Tone/Fader/Loudness/Mixing
D7
D6
D5
D4
D3
D2
D1
D0
4.7 msec
0
0
Advanced
7.1 msec
0
1
Advanced switch
Switch
0
0
1
Time of Mute
11.2 msec
1
0
ON/OFF
14.4 msec
1
1
(Mixing is available only BD37533FV, BD37534FV)
MSB
Time
MSB
D7
Advanced switch
D5
D4
D3
Advanced switch time
OFF
0
of Input gain/Volume
0
0
Tone/Fader/Loudness
ON
1
/Mixing
(Mixing is available only BD37533FV, BD37534FV)
Mode
D6
ON/OFF
D2
D1
LSB
D0
Advanced switch
Time of Mute
1
Select address 02(hex)
fc
MSB
D7
D6
Subwoofer
D5
D4
OFF
55Hz
Level
85Hz
Subwoofer Output
LPF Phase
Meter
Select
120Hz
RESET
160Hz
Prohibition
(Available only BD37532FV, BD37533FV, BD37534FV)
Mode
MSB
D7
LPF
Front
Rear
Prohibition
LPF Phase
Mode
MSB
D7
HOLD
RESET
LPF Phase
D6
Level
Meter
RESET
D6
0
1
LPF
D3
0
Subwoofer Output
D5
D4
D3
0
0
0
1
0
1
0
1
1
fc
D2
0
0
0
0
1
Select
D2
D1
LSB
D0
0
1
0
1
0
LSB
D0
Subwoofer LPF fc
Level Meter RESET
D5
D4
D3
D2
Subwoofer output
select
D1
0
0
1
1
0
Other setting
0
D1
LSB
D0
Subwoofer LPF fc
(Available only BD37534FV)
LPF
D6
D5
D4
Level
0°
0
Subwoofer output
Meter
select
180°
1
RESET
(Available only BD37532FV, BD37533FV, BD37534FV)
Phase
MSB
D7
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19/37
Phase
D3
0
D2
D1
LSB
D0
Subwoofer LPF fc
: Initial Condition
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Select address 03(hex)
f0
MSB
D7
D6
D5
250Hz
400Hz
800Hz
Prohibition
0
0
0
Loudness fo
D4
D3
0
0
0
1
1
0
1
1
D2
D1
LSB
D0
0
0
1
Select address 05(hex)
MSB
Input Selector
OUTF1
OUTF2
D7
D6
D5
D4
D3
D2
A
A1
A2
0
0
0
B
B1
B2
0
0
0
C
C1
C2
0
0
0
D single
DP1
DP2
0
0
0
E1 single
EP1
EN1
0
1
0
Full-di
E2 single
EN2
EP2
0
1
0
ff bias
0
0
type
A diff
A1
B1
0
1
1
select
C diff
B2
C2
1
0
0
D diff
DP1
DP2
0
0
1
E full diff
EP1
EP2
0
1
0
Input SHORT
0
1
0
Prohibition
Other setting
Input SHORT： The input impedance of each input terminal is lowered from 100kΩ(TYP) to 6
(For quick charge of coupling capacitor)
Mode
Mode
Negative Input
Bias
MSB
D7
0
1
D6
0
D1
0
0
1
1
1
1
1
0
1
0
0
LSB
D0
0
1
0
1
0
1
1
0
0
0
1
kΩ(TYP).
Full-diff Bias Type Select
D5
D4
D3
D2
D1
Input
0
0
Selector
LSB
D0
: Initial condition
EP1
Negative input type
1ch signal input
10
EN1
For Ground – isolation type)
1ch
Differential
11
EN2
12
EP2
2ch signal input
2ch
Differential
13
EP1
Bias type
10
For differential amplifier type
EN1
1ch signal input
1ch
Differential
11
EN2
12
EP2
2ch signal input
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20/37
2ch
Differential
13
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Select address 06 (hex)
MSB
Gain
D7
0dB
1dB
2dB
3dB
4dB
5dB
6dB
7dB
8dB
9dB
10dB
11dB
Mute
ON/OFF
12dB
D6
D5
0
0
D6
D5
0
0
13dB
14dB
15dB
16dB
17dB
18dB
19dB
20dB
Prohibition
Mode
OFF
ON
MSB
D7
0
1
Input
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
：
1
Mute
D4
Gain
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
1
：
1
ON/OFF
D3
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
0
：
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
：
1
LSB
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
：
1
D2
D1
LSB
D0
Input Gain
: Initial condition
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21/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Select address 20, 28, 29, 2A, 2B,
MSB
Gain & ATT
D7
0
0
Prohibition
：
0
15dB
0
14dB
0
13dB
0
：
：
-77dB
1
-78dB
1
-79dB
1
1
Prohibition
：
1
-∞dB
1
(About BD37531FV, only 0dB～-∞dB
2C (hex)
Vol, Fader
D6
D5
0
0
0
0
：
：
1
1
1
1
1
1
1
1
：
：
1
0
1
0
1
0
1
0
：
：
1
1
1
1
are available)
Gain
D4
0
0
：
1
1
1
1
：
0
0
0
1
：
1
1
/ Attenuation
D3
D2
D1
0
0
0
0
0
0
：
：
：
0
0
0
0
0
0
0
0
1
0
0
1
：
：
：
1
1
0
1
1
1
1
1
1
0
0
0
：
：
：
1
1
1
1
1
1
LSB
D0
0
1
：
0
1
0
1
：
1
0
1
0
：
0
1
Attenuation
D3
D2
0
0
0
0
：
：
1
0
1
0
1
0
1
0
：
：
1
1
1
1
1
1
0
0
：
：
1
1
1
1
LSB
D0
0
1
：
0
1
0
1
：
1
0
1
0
：
0
1
Select address 30(hex)
MSB
Mixing
D7
D6
D5
0
0
0
0
0
0
Prohibition
：
：
：
0
1
1
7dB
0
1
1
6dB
0
1
1
5dB
0
1
1
：
：
：
：
-77dB
1
1
0
-78dB
1
1
0
-79dB
1
1
0
1
1
0
Prohibition
：
：
：
1
1
1
MIX OFF
1
1
1
(Available only BD37533FV, BD37534FV)
Gain & ATT
Gain
D4
0
0
：
1
1
1
1
：
0
0
0
1
：
1
1
/
D1
0
0
：
0
0
1
1
：
0
1
1
0
：
1
1
: Initial condition
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22/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Select address 41(hex)
Q factor
MSB
D7
D6
Bass
Q
D5
D4
0.5
1.0
1.5
2.0
0
0
fo
MSB
D7
D6
60Hz
80Hz
100Hz
120Hz
0
0
Q factor
MSB
D7
D6
Middle
D5
D4
0.75
1.0
1.25
1.5
0
0
Middle fo
factor
D3
Bass fo
Bass
D4
0
1
0
1
D5
0
0
1
1
D2
0
0
fo
D3
D2
0
0
D1
0
0
1
1
LSB
D0
0
1
0
1
D1
LSB
D0
Bass
Q factor
Select address 44(hex)
fo
500Hz
1kHz
1.5kHz
2.5kHz
MSB
D7
0
D6
0
D5
0
0
1
1
Q
Middle
D4
0
1
0
1
factor
D3
D2
0
0
fo
D3
D2
0
0
D1
0
0
1
1
LSB
D0
0
1
0
1
D1
LSB
D0
Middle
Q factor
Select address 47 (hex)
Q factor
0.75
1.25
fo
7.5kHz
10kHz
12.5kHz
15kHz
MSB
D7
0
MSB
D7
0
D6
Treble
D5
D4
0
Treble fo
D6
0
D5
0
0
1
1
Q
Treble
D4
0
1
0
1
factor
D3
D2
D1
0
0
0
fo
D3
D2
D1
0
0
0
LSB
D0
0
1
LSB
D0
Treble
Q factor
: Initial condition
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23/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Select address 51, 54, 57 (hex)
MSB
Gain
D7
0dB
1dB
2dB
3dB
4dB
5dB
6dB
7dB
8dB
9dB
10dB
Bass/
11dB
Middle/
12dB
Treble
Boost
13dB
/cut
14dB
15dB
16dB
17dB
18dB
19dB
20dB
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
：
1
1
LSB
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
：
0
1
Bass/Middle/Treble Boost/Cut
D6
D5
D4
D3
D2
D1
LSB
D0
D6
0
Prohibition
Mode
Boost
Cut
MSB
D7
0
1
0
Bass/Middle/Treble
D5
D4
D3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
0
1
0
：
：
1
1
1
1
0
Gain
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
：
1
1
Bass/Middle/Treble Gain
: Initial condition
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24/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Select address 75 (hex)
MSB
Mode
D7
Hicut1
Hicut2
0
Hicut3
Hicut4
D6
0
0
1
1
D5
0
1
0
1
MSB
D7
D6
D5
Gain
0dB
1dB
2dB
3dB
4dB
5dB
6dB
7dB
8dB
9dB
10dB
11dB
12dB
13dB
14dB
15dB
16dB
17dB
18dB
19dB
20dB
0
Loudness Hicut
Prohibition
Loudness
D4
Hicut
D3
D2
D1
LSB
D0
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
：
1
LSB
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
：
1
Loudness Gain
Loudness
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
：
1
Gain
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
：
1
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
：
1
: Initial condition
（６）About power on reset
At on of supply voltage circuit made initialization inside IC is built-in. Please send data to all address
as initial data at supply voltage on. And please supply mute at set side until this initial data is sent.
Limit
Item
Symbol
Unit
Condition
Min.
Typ.
Max.
Rise time of VCC
Trise
33
－
－
usec
VCC rise time from 0V to 5V
VCC voltage of release
Vpor
－
4.1
－
V
power on reset
（７））About external compulsory mute terminal
Mute is possible forcibly than the outside after input again department, by the setting of the MUTE terminal.
Mute Voltage Condition
Mode
GND～1.0V
MUTE ON
2.3V～VCC
MUTE OFF
Establish the voltage of MUTE in the condition to have been defined.
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25/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Volume / Fader volume / Mixing attenuation of the details
(dB)
(dB)
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
+15
0
1
1
1
0
0
0
1
-33
1
0
1
+14
0
1
1
1
0
0
1
0
-34
1
0
1
+13
0
1
1
1
0
0
1
1
-35
1
0
1
+12
0
1
1
1
0
1
0
0
-36
1
0
1
+11
0
1
1
1
0
1
0
1
-37
1
0
1
+10
0
1
1
1
0
1
1
0
-38
1
0
1
+9
0
1
1
1
0
1
1
1
-39
1
0
1
+8
0
1
1
1
1
0
0
0
-40
1
0
1
+7
0
1
1
1
1
0
0
1
-41
1
0
1
+6
0
1
1
1
1
0
1
0
-42
1
0
1
+5
0
1
1
1
1
0
1
1
-43
1
0
1
+4
0
1
1
1
1
1
0
0
-44
1
0
1
+3
0
1
1
1
1
1
0
1
-45
1
0
1
+2
0
1
1
1
1
1
1
0
-46
1
0
1
+1
0
1
1
1
1
1
1
1
-47
1
0
1
0
1
0
0
0
0
0
0
0
-48
1
0
1
-1
1
0
0
0
0
0
0
1
-49
1
0
1
-2
1
0
0
0
0
0
1
0
-50
1
0
1
-3
1
0
0
0
0
0
1
1
-51
1
0
1
-4
1
0
0
0
0
1
0
0
-52
1
0
1
-5
1
0
0
0
0
1
0
1
-53
1
0
1
-6
1
0
0
0
0
1
1
0
-54
1
0
1
-7
1
0
0
0
0
1
1
1
-55
1
0
1
-8
1
0
0
0
1
0
0
0
-56
1
0
1
-9
1
0
0
0
1
0
0
1
-57
1
0
1
-10
1
0
0
0
1
0
1
0
-58
1
0
1
-11
1
0
0
0
1
0
1
1
-59
1
0
1
-12
1
0
0
0
1
1
0
0
-60
1
0
1
-13
1
0
0
0
1
1
0
1
-61
1
0
1
-14
1
0
0
0
1
1
1
0
-62
1
0
1
-15
1
0
0
0
1
1
1
1
-63
1
0
1
-16
1
0
0
1
0
0
0
0
-64
1
1
0
-17
1
0
0
1
0
0
0
1
-65
1
1
0
-18
1
0
0
1
0
0
1
0
-66
1
1
0
-19
1
0
0
1
0
0
1
1
-67
1
1
0
-20
1
0
0
1
0
1
0
0
-68
1
1
0
-21
1
0
0
1
0
1
0
1
-69
1
1
0
-22
1
0
0
1
0
1
1
0
-70
1
1
0
-23
1
0
0
1
0
1
1
1
-71
1
1
0
-24
1
0
0
1
1
0
0
0
-72
1
1
0
-25
1
0
0
1
1
0
0
1
-73
1
1
0
-26
1
0
0
1
1
0
1
0
-74
1
1
0
-27
1
0
0
1
1
0
1
1
-75
1
1
0
-28
1
0
0
1
1
1
0
0
-76
1
1
0
-29
1
0
0
1
1
1
0
1
-77
1
1
0
-30
1
0
0
1
1
1
1
0
-78
1
1
0
-31
1
0
0
1
1
1
1
1
-79
1
1
0
-32
1
0
1
0
0
0
0
0
-∞
1
1
1
About BD37531FV, Fader Volume only 0dB～-∞dB are available.
Mixing is available only BD37533FV, BD37534FV. Adjustable range is +7dB～-∞dB.
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
D3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
D2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
D1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
：Initial condition
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26/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
About Level meter(available only BD37534FV)
（１） The operation of circuit
Level meter is a function which gives DC voltage proportional to the size of signal of sound. It detects
the peak level of signal and keeps the peak level, so that it is possible to monitor the size of signal by
resetting DC voltage kept with suitable interval.
（２） The way to reset level meter output
Please send reset data through I2C BUS
When reset output of level meter：Send D6 = “ 1 “ of select address 02(hex).
When cancel of output reset of level meter (HOLD)… → Send D6 = “ 0 “ of select address 02(hex).
（３） The settings about period of reset
Peak hold operation will start after HOLD data is transmitted. Set the WAIT time after HOLD data transmission
according to the frequency bandwidth detected.
WAIT time must be set to a minimum of one cycle over the detected frequency bandwidth.
Ex) Detected frequency bandwidth is above 40Hz, 『40Hz = 25ms = WAIT time』
Transmission Example by I2C BUS
(RESET)
2
I CBUS
80 10 02
RESET
START
40
(HOLD)
80
02
00
Wait time
(25msec)
HOLD
START
※fin＝40Hz
LOUT [ V ]
detect
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27/37
t
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Application circuit
FIL
GND
SDA
SCL
VCC
OUTF1 OUTF2 OUTR1 OUTR2 OUTS1 OUTS2
10μ
0.1μ
10μ
10μ
10μ
10μ
10μ
10μ
TEST3
10μ
26
25
24
23
22
21
Fader★
27
Fader★
28
MUTE
20
19
18
17
TEST2
16
15
VCC
VCC/2
GND
I2C BUS LOGIC
Fader★
Fader★
Fader★
■Fader
Gain:0dB～-79ｄB/1dB step
★no pop noise
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
100k
3
100k
4
100k
5
100k
6
GND
ISO amp
250k
7
250k
8
GND
ISO amp
250k
250k
10
9
GND
ISO amp
250k
11
250k
12
250k
13
14
TEST1
2.2μ
2.2μ
Single1
2.2μ
Single2
GND Isolation2
2.2μ
2.2μ
Single3
GND Isolation3
※Single1～3はGND Isolation2,3に切換可能
※About single input 1～3, it is possible to change
（About single input 1～3, it is possible to change from
from
single
inputIsolation
to GNDinput
Isolation
single
input
to GND
2,3.） input 2,3.
2.2μ
2.2μ
10μ
GND Isolation1 or
Single4
2.2μ
2.2μ
10μ
10μ
2.2μ
Full Differential or
Single5, Single6
※GND Isolation1, Full DifferentialはSingle4～6に切換可能
※About GND Isolation1 and Full Differential, it is possible
（About GND Isolation1 and Full Differential, it is possible
to change from differential input to single input 4～6.）
to change from differential input to single input 4～6.
Unit
R : [Ω]
C : [F]
Fig.28 BD37531FV
Notes on wiring
①
②
③
④
Please connect the decoupling capacitor of a power supply in the shortest distance as much as possible to GND.
Lines of GND shall be one-point connected.
Wiring pattern of Digital shall be away from that of analog unit and cross-talk shall not be acceptable.
Lines of SCL and SDA of I2C BUS shall not be parallel if possible.
The lines shall be shielded, if they are adjacent to each other.
⑤ Lines of analog input shall not be parallel if possible. The lines shall be shielded, if they are adjacent
to each other.
⑥ About TEST pin(14,16,17pin), please use with OPEN.
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28/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
FIL
GND
SDA
SCL
OUTF1 OUTF2 OUTR1 OUTR2 OUTS1 OUTS2
VCC
10μ
0.1μ
10μ
10μ
10μ
10μ
10μ
10μ
TEST3
10μ
24
23
22
21
20
Fader★
25
Fader★
26
Fader★
27
Fader★
28
MUTE
19
18
TEST2
17
16
15
VCC
VCC/2
GND
I2C BUS LOGIC
Fader★
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
100k
3
100k
4
100k
5
100k
6
GND
ISO amp
250k
7
250k
8
GND
ISO amp
250k
250k
10
9
GND
ISO amp
250k
11
250k
12
250k
13
14
TEST1
2.2μ
2.2μ
Single1
2.2μ
Single2
GND Isolation2
2.2μ
2.2μ
2.2μ
Single3
2.2μ
10μ
GND Isolation1 or
Single4
GND Isolation3
※Single1～3はGND Isolation2,3に切換可能
※About single input 1～3, it is possible to change
（About single input 1～3, it is possible to change from
from
singleIsolation
input toinput
GND2,3.）
Isolation input 2,3.
single input
to GND
2.2μ
2.2μ
10μ
10μ
2.2μ
Full Differential or
Single5, Single6
※GND Isolation1, Full DifferentialはSingle4～6に切換可能
※About GND Isolation1 and Full Differential, it is possible
Unit
R : [Ω]
C : [F]
（About GND Isolation1 and Full Differential, it is possible
to change from differential input to single input 4～6.
to change from differential input to single input 4～6.）
Fig.29 BD37532FV
Notes on wiring
①
②
③
④
Please connect the decoupling capacitor of a power supply in the shortest distance as much as possible to GND.
Lines of GND shall be one-point connected.
Wiring pattern of Digital shall be away from that of analog unit and cross-talk shall not be acceptable.
Lines of SCL and SDA of I2C BUS shall not be parallel if possible.
The lines shall be shielded, if they are adjacent to each other.
⑤ Lines of analog input shall not be parallel if possible. The lines shall be shielded, if they are adjacent
to each other.
⑥ About TEST pin(14,15,16pin), please use with OPEN.
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29/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
FIL
GND
SDA
SCL
VCC
OUTF1 OUTF2 OUTR1 OUTR2 OUTS1 OUTS2
10μ
0.1μ
10μ
10μ
10μ
10μ
10μ
10μ
TEST2
10μ
24
23
22
21
20
Fader★
25
Fader★
26
Fader★
27
Fader★
28
MUTE
19
18
17
TEST1
16
15
VCC
VCC/2
GND
I2C BUS LOGIC
ATT★
Fader★
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
2.2μ
100k
3
2.2μ
Single1
100k
4
2.2μ
Single2
GND Isolation2
100k
5
2.2μ
100k
6
2.2μ
250k
7
2.2μ
Single3
GND Isolation3
※Single1～3はGND
※About singleIsolation2,3に切換可能
input 1～3, it is possible to change
（About single input 1～3, it is possible to change from
fromtosingle
input to GND
input 2,3.
single input
GND Isolation
input Isolation
2,3.）
GND
ISO amp
250k
8
2.2μ
GND
ISO amp
250k
10
9
10μ
250k
2.2μ
GND Isolation1 or
Single4
GND
ISO amp
250k
11
2.2μ
250k
12
10μ
250k
13
10μ
14
2.2μ
Full Differential or
Single5, Single6
※GND
Isolation1,
Full DifferentialはSingle4～6に切換可能
※About
GND Isolation1
and Full Differential, it is possible
2.2μ
MIN
Unit
R : [Ω]
C : [F]
（About
GND Isolation1
and Fullinput
Differential,
it is
possible
to change
from differential
to single
input
4～6.
to change from differential input to single input 4～6.）
Fig.30 BD37533FV
Notes on wiring
①
②
③
④
Please connect the decoupling capacitor of a power supply in the shortest distance as much as possible to GND.
Lines of GND shall be one-point connected.
Wiring pattern of Digital shall be away from that of analog unit and cross-talk shall not be acceptable.
Lines of SCL and SDA of I2C BUS shall not be parallel if possible.
The lines shall be shielded, if they are adjacent to each other.
⑤ Lines of analog input shall not be parallel if possible. The lines shall be shielded, if they are adjacent
to each other.
⑥ About TEST pin(16,17pin), please use with OPEN.
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30/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
FIL
GND
SDA
SCL
VCC
OUTF1 OUTF2 OUTR1 OUTR2 OUTS1 OUTS2 LOUT
10μ
0.1μ
10μ
10μ
10μ
10μ
10μ
LRST
MUTE
16
15
10μ
10μ
24
23
22
21
20
Fader★
25
Fader★
26
Fader★
27
Fader★
28
19
18
17
VCC
VCC/2
GND
I2C BUS LOGIC
ATT★
Fader★
■Fader
Gain:+15dB～-79ｄB/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Gain:20dB～0ｄB/1ｄB step
★no pop noise
・ｆ0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain：+20dB～-20dB/1dB step
★no pop noise
・Bass：f0=60/80/100/120Hz
Q=0.5/1.0/1.5/2.0
・Meddle:f0=500/1k/1.5k/2.5kHz
Q=0.75/1/1.25/1.5
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain：+15dB～-79dB/1dB step
★no pop noise
■Input Gain
Gain：+20dB～0dB/1dB step
★no pop noise
LPF
★Loudness
★3 Band P-EQ
(Tone control)
★Volume/Mute
Level meter
★Input Gain
Input selector (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
100k
2
2.2μ
100k
3
2.2μ
100k
4
2.2μ
100k
5
2.2μ
100k
6
2.2μ
250k
7
2.2μ
GND
ISO amp
250k
8
250k
250k
10
9
10μ
2.2μ
GND
ISO amp
2.2μ
2.2μ
GND
ISO amp
250k
11
250k
12
10μ
250k
13
10μ
14
2.2μ
2.2μ
Unit
Single2
Single3
Single1 single input
※About
1～3, it is possible
to change
from single input to GND Isolation input 2,3.
GND Isolation3
MIN
※About GND Isolation1 and Full Differential, it is possible
to change from differential input to single input 4～6.
R : [Ω]
C : [F]
Fig.31 BD37534FV
Notes on wiring
① Please connect the decoupling capacitor of a power supply in the shortest distance as much as possible to GND.
② Lines of GND shall be one-point connected.
③ Wiring pattern of Digital shall be away from that of analog unit and cross-talk shall not be acceptable.
④ Lines of SCL and SDA of I2C BUS shall not be parallel if possible.
The lines shall be shielded, if they are adjacent to each other.
⑤ Lines of analog input shall not be parallel if possible. The lines shall be shielded, if they are adjacent
to each other.
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31/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Interfaces
Terminal
No.
Terminal
Name
Terminal
Voltage
Equivalent Circuit
A terminal for signal input.
The input impedance is 100kΩ(typ).
V cc
1
A1
2
A2
3
B1
4
B2
5
C1
6
C2
7
DP1
4.25
100k
GN D
Input terminal available to
single/Differential mode.
The input impedance is 250kΩ(typ).
V cc
8
DN
9
DP2
10
EP1
11
EN1
12
EN2
13
EP2
4.25
250ｋ
GN D
A terminal for external compulsory mute.
If terminal voltage is High level, the
mute is off. And if the terminal voltage
is Low level, the mute is on.
Vcc
15
MUTE
Terminal Description
－
1.65V
GND
A terminal for fader and Subwoofer output.
VCC
18
OUTS2
19
OUTS1
20
OUTR2
21
OUTR1
22
OUTF2
23
OUTF1
4.25
GND
A terminal for level meter output
(BD37534FV)
Output impedance is 10kΩ(typ).
VCC
17
LOUT
0～3.3
10k
GND
The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn’t guarantee the value.
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32/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
Terminal
No.
Terminal
Name
Terminal
Voltage
Equivalent Circuit
Terminal Description
Power supply terminal.
24
VCC
8.5
A terminal for clock input of I2C BUS
communication.
Vcc
25
SCL
－
1.65V
GND
A terminal for data input of I2C BUS
communication.
Vcc
26
SDA
－
1.65V
GND
Ground terminal.
27
GND
0
Voltage for reference bias of analog
signal system. The simple precharge
circuit and simple discharge circuit for
an external capacitor are built in.
Vcc
50k
28
FIL
4.25
50k
GND
A terminal for signal input
(BD37533FV, BD37534FV)
The input impedance is 27kΩ(typ).
Vcc
14
MIN
4.25
27k
GND
TEST terminal
(BD37531FV,BD37532FV,BD37533FV)
About
BD37531FV
and
BD37532FV,
14,16,17pin are TEST Pin.
About BD37533FV, 16,17pin are TEST Pin.
14
16
TEST
-
17
The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn’t guarantee the value.
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33/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Notes for use
1. Absolute maximum rating voltage
When it impressed the voltage on VCC more than the absolute maximum rating voltage, circuit currents increase
rapidly, and there is absolutely a case to reach characteristic deterioration and destruction of a device.
In particular in a serge examination of a set, when it is expected the impressing serge at VCC terminal (24pin),
please do not impress the large and over the absolute maximum rating voltage (including a operating voltage
+ serge ingredient (around 14V)).
2. About a signal input part
1）About constant set up of input coupling capacitor
In the signal input terminal, the constant setting of input coupling capacitor C(F) be sufficient input
impedance RIN(Ω) inside IC and please decide. The first HPF characteristic of RC is composed.
G〔dB〕
C〔F〕
0
RIN
A(f)
〔Ω〕
Ｓ
Ｓ
f〔Hz〕
INPUT
A(f) 
(2πfCRIN) 2
1  (2πfCRIN) 2
2) About the input selector SHORT
SHORT mode is the command which makes switch SSH =ON an input selector part and input impedance RIN of all
terminals, and makes resistance small. Switch SSH is OFF when not choosing a SHORT command.
A constant time becomes small at the time of this command twisting to the resistance inside the capacitor
connected outside and LSI. The charge time of a capacitor becomes short. Since SHORT mode turns ON the switch
of SSH and makes it low impedance, please use it at the time of a non-signal.
3. About Mute terminal(15pin) when power supply is off
Any voltage shall not be supplied to Mute terminal (15pin) when power-supply is off.
Please insert a resistor (about 2.2kΩ) to Mute terminal in series, if voltage is supplied to mute terminal
in case. (Please refer Application Circuit Diagram.)
4. About TEST Pin
About TEST Pin, please use with OPEN.
About BD37531FV and BD37532FV, 14,16,17pin are TEST Pin. About BD37533FV, 16,17pin are TEST Pin.
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34/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
5. About Mixing (BD3753FV,BD37534FV)
・About specification of Fader -∞ at Mixing ON.
Mixed signal is added to Main signal after Fader Gain(+15～-79dB) like the following figure. When Fader is made
a set up in -∞, the signal after a Mixing signal is added is done with MUTE. Because the -∞ circuit of Fader
is in the step after the addition circuit.
Fig.32 About Front Fader and Mixing
・About advanced switching of Mixing Gain/ATT
When advanced switching of Mixing Gain/ATT works, Mixing becomes the switching movement that it passed through
state of Mixing OFF like B (A present setup of Mixing Gain/ATT → Mixing OFF → A target setup of Mixing
Gain/ATT).
A
B
Fader Gain/ATT 0dB → -6dB advanced switching
Mixing Gain/ATT 0dB → -6dB advanced switching
Fig.33 Advanced switching movement when Mixing Gain/ATT is changed
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35/37
2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●Thermal Derating Curve
About the thermal design by the IC
Characteristics of an IC have a great deal to do with the temperature at which it is used, and exceeding absolute
maximum ratings may degrade and destroy elements. Careful consideration must be given to the heat of the IC from the
two standpoints of immediate damage and long-term reliability of operation.
Reference data
SSOP-B28
Power Dissipation Pd（W）
1.5
Measurement condition: ROHM Standard board
board Size：70×70×1.6(㎣)
material：A FR4 grass epoxy board
(3% or less of copper foil area)
1.063W
1.0
θja = 117.6℃/W
0.5
0.0
0
25
50
75
85
100
125
150
Ambient Temperature Ta（℃）
Fig.34 Temperature Derating Curve
Note) Values are actual measurements and are not guaranteed.
Power dissipation values vary according to the board on which the IC is mounted.
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2010.03 - Rev.A
Technical Note
BD37531FV,BD37532FV,BD37533FV,BD37534FV
●
Ordering part number
B
D
3
Part No.
7
5
3
1
F
Part No.
37531
37532
37533
37534
V
-
Package
FV : SSOP-B28
E
2
Packaging and forming specification
E2: Embossed tape and reel
SSOP-B28
<Tape and Reel information>
10 ± 0.2
(MAX 10.35 include BURR)
15
0.3Min.
1
Embossed carrier tape
Quantity
2000pcs
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
14
0.15 ± 0.1
0.1
1.15 ± 0.1
Tape
Direction
of feed
5.6 ± 0.2
7.6 ± 0.3
28
0.1
0.65
0.22 ± 0.1
1pin
Reel
(Unit : mm)
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37/37
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2010.03 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
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While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
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More detail product informations and catalogs are available, please contact us.
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http://www.rohm.com/contact/
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R1010A