Datasheet
Sound Processor
with Built-in 2-band Equalizer
BD37513FS
General Description
BD37513FS is a sound processor with built-in 2-band
equalizer for car audio. The functions are 4ch stereo
input selector, input-gain control, main volume,
loudness, and 4ch fader volume. Moreover, its
“Advanced switch circuit”, which is an original ROHM
technology, can reduce various switching noise (ex.
No-signal, low frequency like 20Hz & large signal
inputs). “Advanced switch” makes control of
microcomputer easier, supporting the construction of a
high quality car audio system.
Key Specifications
Power Supply Voltage Range:
Circuit Current (No Signal):
Total Harmonic Distortion 1:
Maximum Input Voltage:
Cross-talk Between Selectors:
Volume Control Range:
Output Noise Voltage 1:
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
Package
Features
Reduce switching noise of input gain control, mute,
main volume, fader volume, bass, treble, loudness
by using advanced switch circuit.
Built-in 1 differential input selector and 3
single-ended input selectors
Built-in ground isolation amplifier inputs, ideal for
external stereo input.
Built-in input gain controller reduces switching
noise for volume of a portable audio input.
Decrease the number of external components due
to built-in 2-band equalizer filter and loudness filter.
Also, it is possible to control Gv using I
2
C BUS
control.
It is possible to adjust the gain of the bass and
treble up to ±20dB with 1 dB step gain adjustment.
Energy-saving design resulting in low current
consumption, by utilizing the Bi-CMOS process. It
has the advantage in quality over scaling down the
power heat control of the internal regulators.
Input terminals and output terminals are organized
and separately laid out to keep the signal flow in
one direction which results in simpler and smaller
PCB layout.
It is possible to control the I
2
C BUS by 3.3V/5V.
W(Typ) x D(Typ) x H(Max)
SSOP-A20
8.70mm x 7.80mm x 2.01mm
Applications
It is optimal for use in car audio systems. It can also be
used for audio equipment of mini Compo, micro Compo,
TV, etc.
○Product
structure：Silicon monolithic integrated circuit
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product has no designed protection against radioactive rays
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BD37513FS
Typical Application Circuit
BD37513FS
Unit
R : [Ω]
C : [F]
Pin Configuration
TOP VIEW
FIL 1
A1 2
A2 3
B1 4
B2 5
C1 6
C2 7
DP1 8
DN 9
DP2 10
20 GND
19 SDA
18 SCL
17 VCC
16 OUTF1
15 OUTF2
14 OUTR1
13 OUTR2
12 TEST1
11 MUTE
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin
Name
FIL
A1
A2
B1
B2
C1
C2
DP1
DN
DP2
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 input terminal of 1ch
C input terminal of 2ch
D positive input terminal of 1ch
D negative input terminal
D positive input terminal of 2ch
Pin No.
11
12
13
14
15
16
17
18
19
20
Pin Name
MUTE
TEST1
OUTR2
OUTR1
OUTF2
OUTF1
VCC
SCL
SDA
GND
Description
External compulsory mute terminal
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
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© 2015 ROHM Co., Ltd. All rights reserved.
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BD37513FS
Block Diagram
20
19
18
17
VCC
16
15
14
13
12
11
GND
I
2
C BUS LOGIC
■Fader
Gain: 0dB to -79dB/1dB step
Gain:0dB½-79½B/1dB step
★no pop noise
■Loudness
20dB to 0dB/1dB step
20dB½0½B/1½B step
★no pop noise
・½0=800
・Hicut1/2/3/4
■2 Band EQ (Tone control)
Gain:+20dB to -20dB/1dB
Gain：+20dB½-20dB/1dB
★no pop noise
・Bass：f0=100Hz,
Q=1.0
・Treble：f0=10kHz
Q=1.25
■Volume
Gain+15dB to -79dB/1dB step
Gain:+15dB½-79dB/1dB step
★no pop noise
■Input Gain
Gain:+20dB to 0dB/1dB step
Gain:+20dB½0dB/1dB step
★no pop noise
Input selector (3 single-end and 1 stereo ISO)
GND
ISO amp
VCC/2
Fader★
★Loudness
★2
Band EQ
(Tone control)
★Volume/Mute
★Input
Gain
Fader★
Fader★
Fader★
GND
ISO amp
250k
250k
100k
100k
100k
100k
250k
250k
250k
1
2
3
4
5
6
7
8
9
10
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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BD37513FS
Absolute Maximum Ratings
(Ta=25°C)
Parameter
Power Supply Voltage
Input Voltage
Power Dissipation
Storage Temperature
Symbol
V
CC
V
IN
Pd
Tstg
Rating
10.0
V
CC
+0.3 to GND-0.3
0.94
(Note)
-55 to +150
Unit
V
V
W
°C
(Note) This value derates by 7.5mW/°C for Ta=25°C or more when ROHM standard board is used.
Thermal resistance θja = 133.3(°C/W)
ROHM Standard board
Size : 70 x 70 x 1.6(mm
3
)
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
V
Electrical Characteristics
BLOCK
(Unless specified otherwise, Ta=25°C, V
CC
=8.5V, f=1kHz, V
IN
=1Vrms, Rg=600Ω, R
L
=10kΩ, A 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
Voltage Gain
Channel Balance
Total Harmonic Distortion 1
(FRONT,REAR)
I
Q
G
V
CB
THD+N1
V
NO1
－
-1.5
-1.5
－
－
38
0
0
0.001
3.8
48
+1.5
+1.5
0.05
15
mA
dB
dB
％
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
Output Noise Voltage 1
(FRONT,REAR)＊
Residual Output Noise Voltage＊
V
NOR
－
1.8
10
μVrms
Cross-talk Between Channels＊
CTC
－
－
70
175
2.1
－
-100
-90
dB
Ripple Rejection
Input Impedance(A,B)
Input Impedance (C,D)
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
Cross-talk 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
+18
-2
+20
0
+22
+2
dB
dB
V
IM
at THD+N(V
OUT
)=1％
BW=400Hz-30KHz
Rg = 0Ω
CTS=20log(V
OUT
/V
IN
)
BW = IHF-A
DP1 and DN input
DP2 and DN 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=+1dB to +20dB
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
INPUT GAIN
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BD37513FS
Electrical Characteristics - continued
BLOCK
(Unless specified otherwise, Ta=25°C, V
CC
=8.5V, f=1kHz, V
IN
=1Vrms, Rg=600Ω, R
L
=10kΩ, A input, Input gain 0dB,
Mute OFF, Volume 0dB, Tone control 0dB, Loudness 0dB, Fader 0dB)
Limit
Parameter
Symbol
Unit
Conditions
Min
Typ
Max
－
Mute ON
G
MUTE
=20log(V
OUT
/V
IN
)
BW = IHF-A
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=0dB 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
MUTE
Mute Attenuation＊
G
MUTE
-105
-85
dB
Maximum Gain
G
V_MAX
G
V_MIN
G
V_ERR1
G
V_ERR2
G
V_ERR3
G
B_BST
+13
－
-2
-3
-4
+18
+15
-100
0
0
0
+20
+17
-85
+2
+3
+4
+22
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
Maximum Boost Gain
G
B_CUT
G
B_ERR
G
T_BST
-22
-2
+18
-20
0
+20
-18
+2
+22
dB
dB
dB
TREBLE
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
5/26
TSZ02201-0C2C0E100430-1-2
16.Dec.2015 Rev.001
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