Datasheet
Sound Processor
with Built-in 2-band Equalizer
BD37522FS
General Description
BD37522FS is a sound processor with built-in 2-band
equalizer for car audio. Other features are stereo 5ch input
selector, input-gain control, main volume, loudness and a
4ch fader volume. It is equipped with an “Advanced switch
circuit”, which is an original ROHM technology, that reduces
various switching noise (ex. No-signal, low frequency like
20Hz & large signal inputs).The “Advanced switch” makes
controlling of microcomputer easier and can be used for
designing high quality car audio systems.
Key Specifications
Power Supply Voltage Range:
Circuit Current (No Signal):
Total Harmonic Distortion:
Maximum Input Voltage:
Crosstalk Between Selectors:
Volume Control Range:
Output Noise Voltage:
Residual Output Noise Voltage:
Operating Temperature Range:
7.0V to 9.5V
38mA(Typ)
0.001%(Typ)
2.3Vrms(Typ)
-100dB(Typ)
+15dB to -79dB
3.8µVrms(Typ)
1.8µVrms (Typ)
-40°C to +85°C
Features
Reduced switching noise of input gain control, mute,
main volume, fader volume, bass, treble, and
loudness by using advanced switch circuit.
Built-in 1 differential input selector and 4
single-ended input selectors
Built-in ground isolation amplifier inputs which is
ideal for external stereo input.
Built-in input gain controller which reduces switching
noise for volume of a portable audio input.
Lesser number of external components due to
built-in 2-band equalizer filter and loudness filter.
These make it possible to control Q, Gv, fo of 2-band
equalizer, and Gv of loudness by I
2
C BUS
A gain adjustment quantity of ±20dB with a 1 dB step
gain adjustment is possible for the bass, middle, and
treble.
Energy-saving design resulting in low current
consumption is achieved by utilizing the BiCMOS
process. It has the advantage in quality over scaling
down the power heat control of the internal
regulators.
Input pins and output pins are organized and
separately laid out to keep the signal flow in one
direction which consequently, simplify pattern layout
of the set board and decrease the board dimensions.
It is possible to be controlled by a 3.3V / 5V I
2
C BUS
Package
W(Typ) x D(Typ) x H(Max)
SSOP-A24
10.00mm x 7.80mm x 2.10mm
Applications
It is optimal for car audio systems. It can also be used
for audio equipment like mini Compo, micro Compo,
TV etc.
○Product
structure：Silicon monolithic integrated circuit
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product has no designed protection against radioactive rays
1/27
TSZ02201-0C2C0E100470-1-2
16.Dec.2015 Rev.001
BD37522FS
Typical Application Circuit
BD37522FS
Pin Configuration
TOP VIEW
FIL 1
A1
A2
B1
B2
CP1
CN
CP2
D1
D2
E1
E2
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
GND
SDA
SCL
VCC
OUTF1
OUTF2
OUTR1
OUTR2
TEST3
TEST2
TEST1
MUTE
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
2/27
TSZ02201-0C2C0E100470-1-2
16.Dec.2015 Rev.001
BD37522FS
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
Pin Name
FIL
A1
A2
B1
B2
CP1
CN
CP2
D1
D2
E1
E2
Description
VCC/2 terminal
A input terminal of 1ch
A input terminal of 2ch
B input terminal of 1ch
B input terminal of 2ch
C positive input terminal of 1ch
C negative input terminal
C positive input terminal of 2ch
D input terminal of 1ch
D input terminal of 2ch
E input terminal of 1ch
E input terminal of 2ch
Pin No.
13
14
15
16
17
18
19
20
21
22
23
24
Pin Name
MUTE
TEST1
TEST2
TEST3
OUTR2
OUTR1
OUTF2
OUTF1
VCC
SCL
SDA
GND
Test Pin
Test Pin
Test Pin
Rear output terminal of 2ch
Rear output terminal of 1ch
Front output terminal of 2ch
Front output terminal of 1ch
Power supply terminal
I
2
C Communication clock terminal
I
2
C Communication data terminal
GND terminal
Description
External compulsory mute terminal
Block Diagram
24
23
22
21
VCC
20
19
18
17
16
15
14
13
GND
I
2
C BUS LOGIC
■Fader
Fader
Gain:0dB to -79dB/1dB step
Gain:0dB½-79½B/1dB step
★
no
pop
noise
★no
pop
noise
■Loudness
Loudness
20dB to 0dB/1dB step
20dB½0½B/1½B step
★no pop noise
・½0=800
・Hicut1/2/3/4
■2 Band P-EQ (Tone control)
Gain：+20dB½-20dB/1dB
Gain: +20dB to -20dB/1dB
★no pop noise
・Bass：f0=60/80/100/120Hz,
Q=0.5/1.0/1.5/2.0
・Treble：f0=7.5k/10k/12.5k/15kHz
Q=0.75/1.25
■Volume
Gain: +15dB to -79dB/1dB step
Gain:+15dB½-79dB/1dB step
★no pop noise
■Input Gain
Gain:+20dB½0dB/1dB step
Gain: +20dB to 0dB/1dB step
★no pop noise
Input selector (4 single-end and 1 stereo ISO)
GND
ISO amp
VCC/2
100k
1
2
3
100k
4
100k
5
100k
6
250k
7
250k
8
250k
9
250k
10
250k
11
250k
12
250k
Fader★
★Loudness
★2
Band P-EQ
(Tone control)
★Volume/Mute
★Input
Gain
Fader★
Fader★
GND
ISO amp
Fader★
Unit
R : [Ω]
C : [F]
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
3/27
TSZ02201-0C2C0E100470-1-2
16.Dec.2015 Rev.001
BD37522FS
Absolute Maximum Ratings
(Ta=25°C)
Parameter
Power Supply Voltage
Input Voltage
Power Dissipation
Storage Temperature
Symbol
V
CC
V
IN
Pd
Tstg
3
Rating
10.0
V
CC
+0.3 to GND-0.3
1
(Note)
-55 to +150
Unit
V
V
W
°C
(Note) When mounted on standard board (70 x 70 x 1.6(mm )), derate by 8mW/°C for Ta above 25°C.
Thermal resistance θja = 125(°C/W)
Material : A FR4 grass epoxy board(3% or less of copper foil area)
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the
absolute maximum ratings.
Recommended Operating Conditions
Parameter
Power Supply Voltage
Temperature
Symbol
V
CC
Topr
Min
7.0
-40
Typ
－
－
Max
9.5
+85
Unit
V
°C
Electrical Characteristics
BLOCK
(Unless otherwise noted, Ta=25°C, V
CC
=8.5V, f=1kHz, V
IN
=1Vrms, Rg=600Ω, R
L
=10kΩ, A1 input, Input gain 0dB,
Mute OFF, Volume 0dB, Tone control 0dB, Loudness 0dB, Fader 0dB)
Limit
Parameter
Symbol
Unit
Conditions
Min
Typ
Max
Circuit Current (No Signal)
Voltage Gain
Channel Balance
Total Harmonic Distortion 1
(FRONT,REAR)
Output Noise Voltage 1
(FRONT,REAR) *
Residual Output Noise Voltage *
I
Q
G
V
CB
THD+N1
V
NO1
V
NOR
－
-1.5
-1.5
－
－
－
－
－
70
175
2.1
－
38
0
0
0.001
3.8
1.8
48
+1.5
+1.5
0.05
15
10
mA
dB
dB
%
μVrms
μVrms
No signal
G
V
=20log(V
OUT
/V
IN
)
CB = G
V1
-G
V2
V
OUT
=1Vrms
BW=400Hz-30KHz
Rg = 0Ω
BW = IHF-A
Fader = -∞db
Rg = 0Ω
BW = IHF-A
Rg = 0Ω
CTC=20log(V
OUT
/V
IN
)
BW = IHF-A
f=1kHz
V
RR
=100mVrms
RR=20log(V
CC
IN/V
OUT
)
GENERAL
Crosstalk Between Channels *
CTC
-100
-90
dB
Ripple Rejection
Input Impedance(A, B)
Input Impedance (C,D,E)
RR
R
IN_S
R
IN_D
V
IM
CTS
-70
100
250
2.3
-100
-40
130
325
－
-90
dB
kΩ
kΩ
Vrms
dB
INPUT SELECTOR
Maximum Input Voltage
Crosstalk Between Selectors *
Common Mode Rejection Ratio *
CMRR
50
65
－
dB
Minimum Input Gain
G
IN_MIN
-2
0
+2
dB
Maximum Input Gain
Gain Set Error
G
IN_MAX
G
IN_ERR
G
MUTE
+18
-2
－
+20
0
-105
+22
+2
-85
dB
dB
dB
Mute Attenuation *
V
IM
at THD+N(V
OUT
)=1％
BW=400Hz-30KHz
Rg = 0Ω
CTS=20log(V
OUT
/V
IN
)
BW = IHF-A
CP1 and CN input
CP2 and CN input
CMRR=20log(V
IN
/V
OUT
)
BW = IHF-A
Input gain 0dB
V
IN
=100mVrms
G
IN
=20log(V
OUT
/V
IN
)
Input gain +20dB
V
IN
=100mVrms
G
IN
=20log(V
OUT
/V
IN
)
GAIN=+20dB to +1dB
Mute ON
G
MUTE
=20log(V
OUT
/V
IN
)
BW = IHF-A
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
MUTE
INPUT GAIN
4/27
TSZ02201-0C2C0E100470-1-2
16.Dec.2015 Rev.001
BD37522FS
Electrical Characteristics - continued
BLOCK
Limit
Parameter
Symbol
Min
+13
－
-2
-3
-4
18
Typ
+15
-100
0
0
0
20
Max
+17
-85
+2
+3
+4
22
Unit
Conditions
Volume = +15dB
V
IN
=100mVrms
G
V
=20log(V
OUT
/V
IN
)
Volume = -∞dB
G
V
=20log(V
OUT
/V
IN
)
BW = IHF-A
GAIN & ATT=+15dB to -15dB
ATT=-16dB to -47dB
ATT=-48dB to -79dB
GAIN=+20dB f=100Hz
V
IN
=100mVrms
G
B
=20log (V
OUT
/V
IN
)
GAIN=-20dB f=100Hz
V
IN
=2Vrms
G
B
=20log (V
OUT
/V
IN
)
Gain=+20dB to -20dB f=100Hz
Gain=+20dB f=10kHz
V
IN
=100mVrms
G
T
=20log (V
OUT
/V
IN
)
Gain=-20dB f=10kHz
V
IN
=2Vrms
G
T
=20log (V
OUT
/V
IN
)
Gain=+20dB to -20dB f=10kHz
Fader = -∞dB
G
F
=20log(V
OUT
/V
IN
)
BW = IHF-A
ATT=-1dB to -15dB
ATT=-16dB to -47dB
ATT=-48dB to -79dB
V
IN
=100mVrms
THD+N=1％
BW=400Hz-30KHz
Gain 20dB
V
IN
=100mVrms
G
L
=20log(V
OUT
/V
IN
)
GAIN=+20dB to +1dB
Maximum Gain
G
V_MAX
G
V_MIN
G
V_ERR1
G
V_ERR2
G
V_ERR3
G
B_BST
dB
dB
dB
dB
dB
dB
VOLUME
BASS
Maximum Attenuation＊
Attenuation Set Error 1
Attenuation Set Error 2
Attenuation Set Error 3
Maximum Boost Gain
Maximum Cut Gain
Gain Set Error
G
B_CUT
G
B_ERR
G
T_BST
-22
-2
17
-20
0
20
-18
+2
23
dB
dB
dB
TREBLE
Maximum Boost Gain
Maximum Cut Gain
Gain Set Error
G
T_CUT
G
T_ERR
G
F_MIN
G
F_ERR1
G
F_ERR2
G
F_ERR3
R
OUT
V
OM
G
L_MAX
-23
-2
－
-2
-3
-4
-
2
17
-20
0
-100
0
0
0
－
2.2
20
-17
+2
-90
+2
+3
+4
50
－
23
dB
dB
dB
dB
dB
dB
Ω
Vrms
dB
FADER / SUBWOOFER
LOUDNESS
Maximum Attenuation＊
Attenuation Set Error 1
Attenuation Set Error 2
Attenuation Set Error 3
Output Impedance
Maximum Output Voltage
Maximum Gain
Gain Set Error
G
L_ERR
-2
0
+2
dB
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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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/27
TSZ02201-0C2C0E100470-1-2
16.Dec.2015 Rev.001
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