Datasheet
Sound Processor
with Built-in 3-band Equalizer
BD37533FV
General Description
BD37533FV is a sound processor with built-in 3-band
equalizer for car audio. A stereo input selector is
available that functions to switch single end input and
ground isolation input, input-gain control, main volume,
loudness, 5ch fader volume, LPF for subwoofer and
mixing input. Moreover, “Advanced switch circuit”,
which is an original ROHM technology, can reduce
various switching noise (ex. No-signal, low frequency
like 20Hz & large signal inputs). Also, “Advanced
switch” makes microcomputer control easier, and
constructs a high quality car audio system.
Key Specifications
Power Supply Voltage Range:
Circuit Current (No Signal):
Total Harmonic Distortion 1:
(FRONT,REAR)
Total Harmonic Distortion 2:
(SUBWOOFER)
Maximum Input Voltage:
Cross-talk Between Selectors:
Volume Control Range:
Output Noise Voltage 1:
(FRONT,REAR)
Output Noise Voltage 2:
(SUBWOOFER)
Residual Output Noise Voltage:
Operating Temperature Range:
7.0V to 9.5V
38mA (Typ)
0.001% (Typ)
0.002% (Typ)
2.3Vrms (Typ)
-100dB (Typ)
+15dB to -79dB
3.8µVrms (Typ)
4.8µVrms (Typ)
1.8µVrms (Typ)
-40°C to +85°C
Features
Reduced switching noise of input gain control,
mute, main volume, fader volume, bass, middle,
treble, loudness by using advanced switch circuit
Built-in differential input selector that can make
various combination of single-ended / differential
input.
Built-in ground isolation amplifier inputs, which is
ideal for external stereo input.
Built-in input gain controller reduces volume
switching noise of a portable audio input.
Decreased number of external components due to
built-in 3-band equalizer filter, LPF for subwoofer
and loudness filter. It is possible to freely control
the Q, Gv, fo of the 3-band equalizer, fc of the
LPFand Gv of loudness by I
2
C BUS control.
A gain adjustment quantity of ±20dB with a 1 dB
step gain adjustment is possible for the bass,
middle and treble.
Equipped with terminals for the subwoofer outputs.
Also, the audio signal outputs of the front, rear and
subwoofer can be chosen using the I
2
C BUS
control.
Built-in mixing input, mixing attenuator.
Energy-saving design resulting in low current
consumption is achieved 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 control I
2
C BUS with 3.3V / 5V
Package
W(Typ) x D(Typ) x H(Max)
SSOP-B28
10.0mm x 7.60mm x 1.35mm
Applications
It is optimal for car audio systems. It can also be used
for audio equipment of 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
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BD37533FV
Typical Application Circuit
BD37533FV
Pin Configuration
A1 1
A2 2
B1 3
B2 4
C1
C2
DP1
DN
DP2
5
6
7
8
9
TOP VIEW
28
27
FIL
GND
26 SDA
25 SCL
24 VCC
23
22
21
20
19
18
17
16
15
OUTF1
OUTF2
OUTR1
OUTR2
OUTS1
OUTS2
TEST2
TEST1
MUTE
EP1 10
EN1 11
EN2 12
EP2 13
MIN 14
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin
Name
A1
A2
B1
B2
C1
C2
DP1
DN
DP2
EP1
EN1
EN2
EP2
MIN
Description
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
E positive input terminal of 1ch
E negative input terminal of 1ch
E negative input terminal of 2ch
E positive input terminal of 2ch
Mixing input terminal
Pin No.
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin
Name
MUTE
TEST1
TEST2
OUTS2
OUTS1
OUTR2
OUTR1
OUTF2
OUTF1
VCC
SCL
SDA
GND
FIL
Description
External compulsory mute terminal
Test Pin
Test Pin
Subwoofer output terminal of 2ch
Subwoofer output terminal of 1ch
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
VCC/2 terminal
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0C2C0E100540-1-2
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BD37533FV
Block Diagram
28
27
26
25
24
VCC
23
22
21
20
19
18
17
16
15
VCC/2
GND
I
2
C BUS LOGIC
■Fader
Fader
Gain:+15dB to -79dB/1dB step
Gain:+15dB½-79½B/1dB step
★no pop noise
■LPF
fc=55/85/120/160Hz
■Loudness
Loudness
Gain:+20dB to 0dB/1dB
step
Gain:20dB½0½B/1½B
step
★no pop noise
・½0=250/400/800Hz
・Hicut1/2/3/4
■3 Band P-EQ (Tone control)
Gain: +20dB to -20dB/1dB Step
Gain：+20dB½-20dB/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 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 (3 single-end and 2 stereo ISO)
GND
ISO amp
100k
1
2
100k
3
100k
4
100k
5
100k
6
100k
7
250k
8
Fader★
★Loudness
★3
Band P-EQ
(Tone control)
★Volume/Mute
★Input
Gain
Fader★
Fader★
250k
GND
ISO amp
250k
9
Fader★
10
LPF
GND
ISO amp
250k
11
250k
Fader★
GND
ISO amp
250k
12
13
250k
14
ATT★
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0C2C0E100540-1-2
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BD37533FV
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
1.06
(Note 1)
-55
to
+150
Unit
V
V
W
°C
(Note 1) When mounted on the standar board (70 x 70 x 1.6(mm
3
), derate by 8.5mW/°C for Ta above 25°C.
Thermal resistance θja = 117.6(°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
Limit
7.0
to
9.5
-40
to
+85
Unit
V
°C
Electrical Characteristics
(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, LPF OFF, Mixing OFF, Fader 0dB)
Limit
BLOCK
Parameter
Circuit Current
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) *
Residual Output Noise Voltage *
Symbol
I
Q
G
V
CB
THD+N1
THD+N2
Min
－
-1.5
-1.5
－
－
－
－
－
－
－
70
175
2.1
－
Typ
38
0
0
0.001
0.002
3.8
4.8
1.8
Max
48
+1.5
+1.5
0.05
0.05
15
15
10
Unit
mA
dB
dB
%
%
μVrms
μVrms
μVrms
Conditions
No signal
G
V
=20log(V
OUT
/V
IN
)
CB = G
V1
-G
V2
V
OUT
=1Vrms
BW=400Hz-30KHz
V
OUT
=1Vrms
BW=400Hz-30KHz
Rg = 0Ω
BW = IHF-A
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
V
NO1
V
NO2
V
NOR
Cross-talk Between Channels *
CTC
-100
-90
dB
Ripple Rejection
Input Impedance(A, B, C)
Input Impedance (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
Cross-talk Between Selectors *
Common Mode Rejection Ratio *
(D, E)
CMRR
50
65
－
dB
V
IM
at THD+N(V
OUT
)=1%
BW=400Hz-30KHz
Rg = 0Ω
CTS=20log(V
OUT
/V
IN
)
BW = IHF-A
XP1 and XN input
XP2 and XN input
CMRR=20log(V
IN
/V
OUT
)
BW = IHF-A,[*X・・・D,E]
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© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0C2C0E100540-1-2
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