ROHM BD37513FS Technical data

Sound Processor Series for Car Audio

Sound Processors with Built-in
2-band Equalizer

BD37513FS,BD37514FS,BD37515FS

●Description
BD37513FS, BD37514FS, BD37515FS are sound pr ocessors built-in 2-band equalizer for car audio. The functions are
stereo 4ch input selector, input-gain control, main volume, loudness, 5ch fader volume (About BD37513FS, 4ch fader
volume are available). 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, treble, loudness by using

advanced switch circuit [Possible to control all steps]

2) Built-in 1 differential input selector and 3 single-ended input selectors

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 2-band equalizer filter, LPF(BD37515FS) for subwoofer,

loudness filter. And, possible to control Q(BD37514FS, BD37515FS), Gv, fo(BD37514FS, BD37515FS) of 2-band
equalizer, fc of LPF(BD37515FS) for subwoofer and Gv of loudness by I

6) It is possible for the bass, treble to the gain adjustment quantity of ±20dB and 1 dB step gain adjustment.

7) It is equipped with output terminals of Subwoofer(BD37514FS, BD37515FS).

8) 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.

9) Package is SSOP-A20. Putting input-terminals together and output-terminals together can make PCB layout

easier and can makes area of PCB smaller.

10) It is possible to control by 3.3V / 5V for I

●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.

2

C BUS.

2

C BUS control

No.10085EAT02

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

●Line up matrix

Function BD37513FS BD37514FS BD37515FS Specifications

Input selector ○ ○ ○

Input gain ○ ○ ○

Mute ○ ○ ○

Volume ○ ○ ○

Bass

Treble ○ ○ ○

Fader

Loudness ○ ○ ○

LPF

●Absolute maximum ratings (Ta=25℃)

○ ○ ○

○ ○ ○

× × ○

Technical Note

・Stereo 3 input
・Differential 1 input
・+20～0dB（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）, -∞dB
・ Possible to use “Advanced switch” for prevention of

switching noise.

・ +20～-20dB（1dB step）
・Possible to use “Advanced switch” at changing gain
・Q=0.5, 1, 1.5, 2(BD37513FS:1)
・fo=60, 80, 100, 120Hz(BD37513FS：100Hz)
・ +20～-20dB（1dB step）
・Possible to use “Advanced switch” at changing gain
・Q=0.75, 1.25(BD37513FS：1.25)
・fo=7.5k, 10k, 12.5k, 15kHz(BD37513FS：10kHz)
・+15dB～-79dB(1dB step), -∞dB

(BD37513FS,BD37514FS : 0dB～-79dB, -∞dB)

・ Possible to use “Advanced switch” for prevention of

switching noise.

・20dB～0dB(1dB step)
・fo=800Hz
・ Possible to use “Advanced switch” for prevention of

switching noise.

・fc=55/85/120/160Hz, pass
・Phase shift (0°/180°)

Item Symbol Rating Unit

Power supply Voltage VCC 10.0 V

Input voltage Vin VCC+0.3～GND-0.3 V

Power Dissipation Pd 940 ※1 mW

Storage Temperature Tastg

※This value decreases 7.5mW/℃ for Ta=25℃ or more.
ROHM standard board shall be mounted.
Thermal resistance θja = 133(℃/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 V

-55～+150 ℃

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Technical Note

●Electrical characteristics

(Unless specified particularly, Ta=25℃, VCC=8.5V, f=1kHz, Vin=1Vrms, Rg=600Ω, RL=10kΩ, A input, Input gain 0dB,
Mute off, Volume 0dB, Tone control 0dB, Loudness 0dB, LPF OFF(BD37515FS), Fader 0dB)

Limit

Unit Condition

BLOCK

Item Symbol

Min. Typ. Max.
Current upon no signal IQ － 38 48 mA No signal
Voltage gain GV -1.5 0 +1.5 dB Gv=20log(VOUT/VIN)

Channel balance -1.5 0 +1.5 dB CB = GV1-GV2
Total harmonic distortion 1

(FRONT,REAR)

THD+N1

－

0.001 0.05

％

T otalharmonicdistortion2
(SUBWOOFER)

THD+N2

－ 0.002 0.05 ％
(BD37514FS, BD37515FS)
Output noise voltage 1
(FRONT,REAR)＊

Output noise voltage 2

GENERAL

(SUBWOOFER)＊

－ 3.8 15 μVrms

V

NO1

－ 4.8 15 μVrms

V

NO2

(BD37514FS, BD37515FS)
Residual output noise voltage＊ V

－ 1.8 10 μVrms

NOR

Cross-talk between channels＊ CTC － -100 -90 dB

Ripple rejection RR － -70 -40 dB
Input impedance(A,B) R

Input impedance (C,D) R

70 100 130 kΩ

IN_S

175 250 325 kΩ

IN_D

Maximum input voltage VIM 2.1 2.3 － Vrms

Cross-talk between selectors＊ CTS － -100 -90 dB

INPUT SELECTOR

Common mode rejection ratio＊ CMRR 50 － dB

Minimum input gain G

Maximum input gain G

IN MIN

IN MAX

-2 0 +2 dB

+18 +20 +22 dB

INPUT GAIN

Gain set error G

Mute attenuation＊ G

MUTE

Maximum gain G

Maximum attenuation＊ G

IN ERR

MUTE

V MAX

V MIN

-2 0 +2 dB GAIN=+20～+1dB

－ -105 -85 dB

+13 +15 +17 dB

－ -100 -85 dB

VOLUME

Attenuation set error 1 G
Attenuation set error 2 G
Attenuation set error 3 G

V ERR1
V ERR2
V ERR3

-2 0 +2 dB

-3 0 +3 dB ATT=-16dB～-47dB

-4 0 +4 dB ATT=-48dB～-79dB

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

DP1 and DN input
DP2 and DN input
CMRR=20log(VIN/VOUT)
BW = IHF-A
Input gain 0dB

VIN=100mVrms
Gin=20log(VOUT/VIN)
Input gain 20dB
VIN=100mVrms
Gin=20log(VOUT/VIN)

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

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

BLOCK

Maximum boost gain

BASS

Maximum cut gain

Gain set error
Maximum boost gain

Maximum cut gain

TREBLE

Gain set error
Maximum boost gain

(BD37515FS)

Maximum attenuation* G

Gain set error (BD37515FS)
Attenuation set error 1
Attenuation set error 2

FADER / SUBWOOFER

Attenuation set error 3
Output impedance

Maximum output voltage

Maximum gain

LOUDNESS

Gain set error

VP-9690A(Average value detection, effective value display) filter by Matsushita Communication is used for ＊ measurement.

Phase between input / output is same.

Item Symbol

G

B BST

G

B CUT

G

B ERR

G

T BST

G

T CUT

G

T ERR

G

F BST

F MIN

G

F ERR

G

F ERR1

G

F ERR2

G

F ERR3

R

OUT

V

OM

G

L MAX

G

L ERR

Min. Typ. Max.

+18 +20 +22 dB

-22 -20 -18 dB

+18 +20 +22 dB

-23 -20 -17 dB

-2 0 +2 dB Gain=+20～-20dB f=10kHz

+13 +15 +17 dB

-2 0 +2 dB Gain=+1～+15dB

- － 50 Ω VIN=100mVrms

2 2.2

+17 +20 +23 dB

-2 0 +2 dB GAIN=+20～+1dB

Limit

Unit Condition

-2 0 +2 dB Gain=+20～-20dB f=100Hz

－

-100 -90 dB

-2 0 +2 dB ATT=0～-15dB

-3 0 +3 dB

-4 0 +4 dB ATT=-48～-79dB

－

Vrms

Technical Note

Gain=+20dB f=100Hz
VIN=100mVrms
GB=20log (VOUT/VIN)
Gain=-20dB f=100Hz
VIN=2Vrms
GB=20log (VOUT/VIN)

Gain=+20dB f=10kHz
VIN=100mVrms
GT=20log (VOUT/VIN)
Gain=-20dB f=10kHz
VIN=2Vrms
G

=20log (VOUT/VIN)

T

Fader=15dB
V

=100mVrms

IN

G

=20log(VOUT/VIN)

F

Fader = -∞dB
G

=20log(VOUT/VIN)

F

BW = IHF-A

ATT=-16～-47dB

THD+N=1％
BW=400-30KHz
Gain 20dB
VIN=100mVrms
G

=20log(VOUT/VIN)

L

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

%

u

dB

● Electrical characteristic curves (Reference data)

Technical Note

50

40

30

Iq[mA]

20

10

0

0246810

VCC[V]

Fig.1 Iq vs Vcc

25
20
15
10

5

Gain[dB]

0

-5

-1 0

-1 5

-2 0

-2 5
10 100 1k 10k 100k

BASS GAIN : -20～+20dB
/1dB step
fo : 60Hz Q : 0.5

Frequency [Hz]

Fig.4 Bass Gain vs Freq

25

TREBLE GAIN:-20～+20dB

20

/1dB step
fo : 7.5kHz Q : 0.75

15
10

5
0

-5

Gain (dB)

Gain[dB]

-10

-15

-20

-25
10 100 1k 10k 100k

Fig.7 Treble Gain vs Freq

Frequency [Hz]

Frequency (Hz)

10

1

0.1

THD+N (

THD+N[%]

0.01

100Hz

10kHz

1kHz

0.001

0.0 0 1 0.0 1 0.1 1 10

Vout [Vrms]

Fig.2 Thd vs Vo

Vout (V)

10

1

0.1

0.01

0.001

5
4
3

Vo

Vin[Vrms]

2
1

Gain[dB]

0

Gain (

-1

10 100 1k 10k 100k

-2

-3

-4

-5

Fig.3 Gain vs Freq

Gain=0dB

Frequency [Hz]

Frequency (Hz)

25
20
15
10

5

Gain[dB]

0

-5

-1 0

-1 5

-2 0

-2 5
10 100 1k 10k 100k

fo : 60/80/100/120Hz
BASS GAIN : ±20dB
Q : 0.5

Frequency [Hz]

Fig.5 Bass fo vs Freq

25

fo : 7.5k/10k/12.5k/15kHz

20

TREBLE GAIN : ±20dB
Q : 0.75

15
10

5
0

-5

Gain[dB]

-10

-15

-20

-25
10 100 1k 10k 100k

Frequency [Hz]

Fig.8 Treble fo vs Freq

25
20
15
10

5
0

Gain[dB]

-5

-1 0

-1 5

-2 0

-2 5
10 100 1k 10k 100k

Q : 0.5/1/1.5/2
BASS GAIN : ±20dB
fo : 60Hz

Frequency [Hz]

Fig.6 B Bass Q vs Freq

25

Q : 0.75/1.25

20

TREBLE GAIN : ±20dB
fo : 7.5kHz

15
10

5
0

-5

Gain (dB)

Gain[dB]

-10

-15

-20

-25
10 100 1k 10k 100k

Frequency [Hz]

Frequency (Hz)

Fig.9 Treble Q vs Freq

1000

Din-Audio IHF-A

100

10

Output Noise[uVrms]

出力雑音電圧[uVrms]

1

-80 -70 -60 -50 -40 -30 -20 -10 0 10 20

Volume Gain[dB]

Fig.10 Volume Gain vs Noise

1000

DIN-Audio IHF-A

100

10

Output Noise[uVrms]

出力雑音電圧 [uVrms]

1

-20 -15 -10 -5 0 5 10 15 20

Bass Gain [dB]

Fig.11 Bass Gain vs Noise

1000

DIN-Audio IHF-A

100

10

出力雑音電圧 [uVrms]

Output Noise[uVrms]

1

-20 -15 -10 -5 0 5 10 15 20
Treble Gain [dB]

Fig.12 Treble Gain vs Noise

Fig.5～6 : Bass fo/Q are changeable in only BD37514FS and BD37515FS.fo/Q=100Hz/1.0 and unchangeabl e in BD37513FS.
Fig.8～9 : Treble fo/Q are changeable in only BD37514FS and BD37515FS.fo/Q=10kHz/1.25 and unchangeable in BD37513FS.

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

B

Fr
eq
ue

0

nc

y

-1 0

-2 0

-3 0

-4 0

Gain (d

Gain[dB]

-5 0

-6 0

-7 0
10 100 1k 10k 100k

Frequency (Hz)

Fig.13 CMRR vs Freq

[Hz]

Vo [Vrms]

Gain[dB]

Fig.16 Advanced Switch 2

2.5

2.0

1.5

1.0

最大出力[Vrms]

0.5

0.0
100 1000 10000 100000

Rload [ohm]

出力負荷[ohm]

Fig.14 Rload vs Vo

Technical Note

Fig.15 Advanced Switch 1

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

●Block diagram and pin configuration

20 19 18 17 16 15 14 13 12 11

GND

I2C BUS LOGIC

■Fader
Gain:0dB～-79ｄB/1dB step

★no pop noise

■Loudness
20dB～0ｄB/1ｄB step

★no pop noise

・ｆ0=800
・Hicut1/2/3/4

■2 Band EQ (Tone control)
Gain：+20dB～-20dB/1dB

★no pop noise

・Bass：f0=100Hz,

Q=1.0

・Treble：f0=10kHz

Q=1.25

■Volume
Gain:+15dB～-79dB/1dB step

★no pop noise

■Input Gain
Gain:+20dB～0dB/1dB step

★no pop noise

Input selector (3 single-end and 1 stereo ISO)

VCC/2

100k

100k 100k 100k 250k 250k 250k

1 2 3 4 5 6 7 8 9 10

Descriptions of terminal

Terminal

No.

Terminal

Name

Description

1 FIL VCC/2 terminal 11 MUTE External compulsory mute terminal
2 A1 A input terminal of 1ch 12 TEST1 Test Pin
3 A2 A input terminal of 2ch 13 OUTR2 Rear output terminal of 2ch
4 B1 B input terminal of 1ch 14 OUTR1 Rear output terminal of 1ch
5 B2 B input terminal of 2ch 15 OUTF2 Front output terminal of 2ch
6 C1 C input terminal of 1ch 16 OUTF1 Front output terminal of 1ch
7 C2 C input terminal of 2ch 17 VCC Power supply terminal
8 DP1 D positive input terminal of 1ch 18 SCL I2C Communication clock terminal
9 DN D negative input terminal 19 SDA I2C Communication data terminal

10 DP2 D positive input terminal of 2ch 20 GND GND terminal

VCC

Fader★

Fader★

★Loudness

★2 Band EQ

(Tone control)

★Volume/Mute

★Input Gain

Fig.17 BD37513FS

Terminal

No.

Fader★

Fader★

GND

ISO amp

Terminal

Name

GND

ISO amp

250k

Technical Note

250k

Description

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

20 19 18 17 16 15 14 13 12 11

GND

I2C BUS LOGIC

■Fader
Gain:0dB～-79ｄB/1dB step

★no pop noise

■Loudness
20dB～0ｄB/1ｄB step

★no pop noise

・ｆ0=800
・Hicut1/2/3/4

■2 Band P-EQ (Tone control)
Gain：+20dB～-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～-79dB/1dB step

★no pop noise

■Input Gain
Gain:+20dB～0dB/1dB step

★no pop noise

Input selector (3 single-end and 1 stereo ISO)

VCC/2

1 2 3 4 5 6 7 8 9 10

100k

100k 100k 100k 250k 250k

Descriptions of terminal

Terminal

No.

Terminal

Name

Description

1 FIL VCC/2 terminal 11 MUTE External compulsory mute terminal
2 A1 A input terminal of 1ch 12 OUTS Subwoofer output terminal
3 A2 A input terminal of 2ch 13 OUTR2 Rear output terminal of 2ch
4 B1 B input terminal of 1ch 14 OUTR1 Rear output terminal of 1ch
5 B2 B input terminal of 2ch 15 OUTF2 Front output terminal of 2ch
6 C1 C input terminal of 1ch 16 OUTF1 Front output terminal of 1ch
7 C2 C input terminal of 2ch 17 VCC Power supply terminal
8 DP1 D positive input terminal of 1ch 18 SCL I2C Communication clock terminal
9 DN D negative input terminal 19 SDA I2C Communication data terminal

10 DP2 D positive input terminal of 2ch 20 GND GND terminal

VCC

Fader★

Fader★

★Loudness

★2 Band P-EQ

(Tone control)

★Volume/Mute

★Input Gain

Fig.18 BD37514FS

Terminal

No.

Fader★

Fader★

GND

ISO amp

250k

Terminal

Name

Fader★

ISO amp

250k

Technical Note

GND

250k

Description

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

20 19 18 17 16 15 14 13 12 11

GND

I2C BUS LOGIC

■Fader
Gain:+15dB～-79ｄB/1dB step

★no pop noise

■LPF
fc=55/85/120/160Hz

■Loudness
20dB～0ｄB/1ｄB step

★no pop noise

・ｆ0=800
・Hicut1/2/3/4

■2 Band P-EQ (Tone control)
Gain：+20dB～-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～-79dB/1dB step

★no pop noise

■Input Gain
Gain:+20dB～0dB/1dB step

★no pop noise

Input selector (3 single-end and 1 stereo ISO)

VCC/2

1 2 3 4 5 6 7 8 9 10

100k

100k 100k 100k 250k 250k 250k

Descriptions of terminal

Terminal

No.

Terminal

Name

Description

1 FIL VCC/2 terminal 11 MUTE External compulsory mute terminal
2 A1 A input terminal of 1ch 12 OUTS Subwoofer output terminal
3 A2 A input terminal of 2ch 13 OUTR2 Rear output terminal of 2ch
4 B1 B input terminal of 1ch 14 OUTR1 Rear output terminal of 1ch
5 B2 B input terminal of 2ch 15 OUTF2 Front output terminal of 2ch
6 C1 C input terminal of 1ch 16 OUTF1 Front output terminal of 1ch
7 C2 C input terminal of 2ch 17 VCC Power supply terminal
8 DP1 D positive input terminal of 1ch 18 SCL I2C Communication clock terminal
9 DN D negative input terminal 19 SDA I2C Communication data terminal

10 DP2 D positive input terminal of 2ch 20 GND GND terminal

VCC

Fader★

★Loudness

★2 Band P-EQ

(Tone control)

★Volume/Mute

★Input Gain

Fig.19 BD37515FS

Fader★

Terminal

No.

Fader★

Fader★

LPF

GND

ISO amp

Terminal

Name

Fader★

ISO amp

250k

Technical Note

GND

250k

Description

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Technical Note

●Timming Chart

CONTROL SIGNAL SPECIFICATION

(１) Electrical specifications and timing for bus lines and I/O stage

SDA

SCL

t

BUF

t

LOW

t

t

R

F

t

HD;STA

t

SP

P

t

HD;STA

S

t

HD;DAT

t

HIGH

t

SU;D AT tSU;STA

Sr

t

SU;STO

Table 1 Characteristics of the SDA and SCL bus lines for I

Fig.20 Definition of timing on the I2C-bus

2

C-bus devices

(Unless specified particularly, Ta=25℃, VCC=8.5V)

2

Parameter Symbol

Fast-mode I

Min. Max.

1 SCL clock frequency ｆSCL 0

C-bus

400 kHz

2 Bus free time between a STOP and START condition tBUF 1.3 － μS

Hold time (repeated) START condition. After this period, the first

3

clock pulse is generated

tHD;STA 0.6 － μS

4 LOW period of the SCL clock tLOW 1.3 － μS
5 HIGH period of the SCL clock tHIGH 0.6 － μS
6 Set-up time for a repeated START condition tSU;STA 0.6 － μS
7 Data hold time: tHD;DAT 0.06* － μS
8 Data set-up time tSU;DAT 120 － ns
9 Set-up time for STOP condition tSU;STO 0.6 － 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 .

P

Unit

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Technical Note

Table 2 Characteristics of the SDA and SCL I/O stages for I

Parameter Symbol

10

LOW level input voltage:

11

HIGH level input voltage:
Pulse width of spikes which must be suppressed by the input filter.

12
13

LOW level output voltage: at 3mA sink current
Input current each I/O pin with an input voltage between 0.4V and

14

4.5V.

ｔHD;STA

：2us

SCL

ｔBUF

：4us

ｔLOW

：3us

SDA

SCL clock frequency：250kHz

2

C-bus devices

ｔHD;DAT

：1us

ｔHIGH
：1us

Fast-mode devices

Min. Max.
VIL -0.3 1 V
VIH 2.3 5 V
tSP 0 50 ns

VOL1 0 0.4 V

Ii -10 10 μA

ｔSU;DAT

：1us

ｔSU;STO

：2us

Unit

Fig.21 A command timing example in the I2C data transmission

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11/29

© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

（２）I2C BUS FORMAT

MSB LSB MSB LSB MSB LSB

S Slave Address A Select Address A Data A P

1bit 8bit 1bit 8bit 1bit 8bit 1bit 1bit

S = Start conditions (Recognition of start bit)
Slave Address = 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）I

（４）Slave address

2

C BUS Interface Protocol

1）Basic form

S Slave Address A Select Address A Data A P

MSB LSB MSB LSB MSB LSB

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 P

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.

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.

MSB LSB

A6 A5 A4 A3 A2 A1 A0 R/W

1 0 0 0 0 0 0 0

80H

Technical Note

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

（５）Select Address & Data

BD37513FS

Initial setup 1 01

Initial setup 2 02 0 0 0 0 0 0 0 0
Initial setup 3 03 0 0 0 1 0 0 0 1
Input Selector 05 0 0 0 Input selector

Input gain 06

Volume gain 20 Volume Gain / Attenuation
Fader 1ch Front 28 Fader Attenuation
Fader 2ch Front 29 Fader Attenuation
Fader 1ch Rear 2A Fader Attenuation
Fader 2ch Rear 2B Fader Attenuation
Test mode 1 2C 1 1 1 1 1 1 1 1
Test mode 2 41 0 0 1 0 0 0 0 1
Test mode 3 44 0 0 0 0 0 0 0 0
Test mode 4 47 0 0 0 1 0 0 0 1

Bass gain 51

Test mode 5 54 1 0 0 0 0 0 0 0

Treble gain 57

Loudness Gain 75 0 Loudness Hicut Loudness Gain
System Reset FE 1 0 0 0 0 0 0 1

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

３．For the function of input selector etc, it is not corresponded for advanced switch. Therefore, pleas e appl y m ute on

４．When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting

Items

shown below.

→01→02→03→05→06→20→28→29→2A→2B→2C

the side of a set when changes these setting.

advanced-mute time.

Select

Address

(hex)

→41→44→47→51→54→57→75

MSB Data LSB

D7 D6 D5 D4 D3 D2 D1 D0

Advanced

switch
ON/OFF

Mute

ON/OFF

Bass

Boost/

Cut

Treble
Boost/

Cut

Advanced switch time

0

of Input Gain/Volume

Tone/Fader/Loudness

0 0

0 0 Bass Gain

0 0 Treble Gain

0 0

Input Gain

Technical Note

Advanced switch time

of Mute

Advanced switch

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

BD37514FS

Items

Initial setup 1 01

Initial setup 2 02 0 0 0 0 0 0 0 0
Initial setup 3 03 0 0 0 1 0 0 0 1
Input Selector 05 0 0 0 Input selector

Input gain 06

Volume gain 20 Volume Gain / Attenuation
Fader 1ch Front 28 Fader / Attenuation
Fader 2ch Front 29 Fader / Attenuation
Fader 1ch Rear 2A Fader / Attenuation
Fader 2ch Rear 2B Fader / Attenuation
Fader Subwoofer 2C Fader / Attenuation
Bass setup 41 0 0 Bass fo 0 0 Bass Q
Test mode 1 44 0 0 0 0 0 0 0 0
Treble setup 47 0 0 Treble fo 0 0 0 Treble Q

Bass gain 51

Test mode 2 54 1 0 0 0 0 0 0 0

Treble gain 57

Loudness Gain 75 0 Loudness Hicut Loudness Gain
System Reset FE 1 0 0 0 0 0 0 1

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.

３．For the function of input selector etc, it is not corresponded for advanced switch. Therefore, pleas e appl y m ute on

４．When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting

→01→02→03→05→06→20→28→29→2A→2B→2C

→41→44→47→51→54→57→75

the side of a set when changes these setting.

advanced-mute time.

Select

Address

(hex)

MSB Data LSB

D7 D6 D5 D4 D3 D2 D1 D0

Advanced

switch
ON/OFF

Mute

ON/OFF

Bass

Boost/

Cut

Treble
Boost/

Cut

Advanced switch time

0

of Input Gain/Volume

Tone/Fader/Loudness

0 0

0 0 Bass Gain

0 0 Treble Gain

0 0

Input Gain

Technical Note

Advanced switch

time of Mute

Advanced switch

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

BD37515FS

Items

Initial setup 1 01

Initial setup 2 02

Initial setup 3 03 0 0 0 1 0 0 0 1
Input Selector 05 0 0 0 Input selector

Input gain 06

Volume gain 20 Volume Gain / Attenuation
Fader 1ch Front 28 Fader Gain / Attenuation
Fader 2ch Front 29 Fader Gain / Attenuation
Fader 1ch Rear 2A Fader Gain / Attenuation
Fader 2ch Rear 2B Fader Gain / Attenuation
Fader Subwoofer 2C Fader Gain / Attenuation
Bass setup 41 0 0 Bass fo 0 0 Bass Q
Test mode 1 44 0 0 0 0 0 0 0 0
Treble setup 47 0 0 Treble fo 0 0 0 Treble Q

Bass gain 51

Test mode 2 54 1 0 0 0 0 0 0 0

Treble gain 57

Loudness Gain 75 0 Loudness Hicut Loudness Gain
System Reset FE 1 0 0 0 0 0 0 1

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.

３．For the function of input selector etc, it is not corresponded for advanced switch. Therefore, pleas e appl y m ute on

４．When using mute function of this IC at the time of changing input selector, please switch mute ON/OFF for waiting

→01→02→03→05→06→20→28→29→2A→2B→2C

→41→44→47→51→54→57→75

the side of a set when changes these setting.

advanced-mute time.

Select

Address

(hex)

MSB Data LSB

D7 D6 D5 D4 D3 D2 D1 D0

Advanced

switch
ON/OFF

LPF

Phase

0 ﾟ/180 ﾟ

Mute

ON/OFF

Bass

Boost/

Cut

Treble
Boost/

Cut

Advanced switch time
of Input Gain/Volume

0

Tone/Fader/Loudness

0 0 0 0 0 Subwoofer LPF fc

0 0

0 0 Bass Gain

0 0 Treble Gain

0 0

Input Gain

Technical Note

Advanced switch

time of Mute

Advanced switch

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Select address 01 (hex)

Time

0.6msec

1.0msec 0 1

1.4msec 1 0

3.2msec 1 1

Time

4.7 msec

7.1 msec 0 1

11.2 msec 1 0

14.4 msec 1 1

Mode

OFF 0

ON 1

Select address 02(hex)

fc

OFF
55Hz 0 0 1
85Hz 0 1 0

120Hz 0 1 1
160Hz 1 0 0

Prohibition Other setting

(BD37515FS)

Phase

0° 0

180° 1

(BD37515FS)

Select address 05(hex)

OUT

Mode

A A1 A2
B B1 B2 0 0 0 1
C C1 C2 0 0 1 0

D diff DP1 DP2 0 1 1 0

Input SHORT：The input impedance of each input terminal is lowered from 100kΩ(TYP) to 6 kΩ(TYP).

F1/R1

Input SHORT 1 0 0 1
Prohibition Other setting

(For quick charge of coupling capacitor)

MSB Advanced switch time of Mute LSB

D7 D6 D5 D4 D3 D2 D1 D0

Advanced

Switch
ON/OFF

MSB

D7 D6 D5 D4 D3 D2 D1 D0

Advanced

Switch
ON/OFF

MSB Advanced switch ON/OFF LSB

D7 D6 D5 D4 D3 D2 D1 D0

MSB Subwoofer LPF fc LSB

D7 D6 D5 D4 D3 D2 D1 D0

LPF Phase 0 0 0 0

MSB LPF Phase LSB

D7 D6 D5 D4 D3 D2 D1 D0

OUT

F2/R2

MSB Input Selector LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 0

0

Input gain/Volume/Tone/Fader/Loudness

0

0

0 0 0 0 Subwoofer LPF fc

Advanced switch time
of Input gain/Volume

Tone/Fader/Loudness

Advanced switch time of

0 0

Advanced switch time
of Input gain/Volume

Tone/Fader/Loudness

0 0

0 0

0 0

0 0 0

0 0 0 0

Technical Note

0 0

Advanced switch Time

Advanced switch

Time of Mute

: Initial condition

LSB

of Mute

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Select address 06 (hex)

Gain

0dB

1dB 0 0 0 0 1

2dB 0 0 0 1 0

3dB 0 0 0 1 1

4dB 0 0 1 0 0

5dB 0 0 1 0 1

6dB 0 0 1 1 0

7dB 0 0 1 1 1

8dB 0 1 0 0 0

9dB 0 1 0 0 1
10dB 0 1 0 1 0
11dB 0 1 0 1 1
12dB 0 1 1 0 0
13dB 0 1 1 0 1
14dB 0 1 1 1 0
15dB 0 1 1 1 1
16dB 1 0 0 0 0
17dB 1 0 0 0 1
18dB 1 0 0 1 0
19dB 1 0 0 1 1
20dB 1 0 1 0 0

Prohibition

Mode

OFF 0

ON 1

Select address 20, 28, 29, 2A, 2B (hex)

Gain & ATT

Prohibition

15dB 0 1 1 1 0 0 0 1
14dB 0 1 1 1 0 0 1 0
13dB 0 1 1 1 0 0 1 1

-77dB 1 1 0 0 1 1 0 1

-78dB 1 1 0 0 1 1 1 0

-79dB 1 1 0 0 1 1 1 1

Prohibition

-∞dB 1 1 1 1 1 1 1 1
(Address 2C is available only BD37514FS, BD37515FS)
(About BD37513FS, BD37514FS, only 0dB～-∞dB are available at address 28, 29, 2A, 2B.)

：

MSB Input Gain LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 0 0

Mute

ON/OFF

MSB Mute ON/OFF LSB

D7 D6 D5 D4 D3 D2 D1 D0

MSB Vol, Fader Gain / Attenuation LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1

： ： ： ： ： ： ： ：

0 1 1 1 0 0 0 0

： ： ： ： ： ： ： ：

1 1 0 1 0 0 0 0

： ： ： ： ： ： ： ：

1 1 1 1 1 1 1 0

0 0

1 1 0 1 1

：

1 1 1 1 1

0 0 Input Gain

：

Technical Note

： ： ：

: Initial condition

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Select address 41(hex)

Q factor

(BD37513FS：1.0 unchangeable)

Q factor

(BD37513FS：100Hz unchangeable)

Select address 47 (hex)

Q factor

(BD37513FS:1.25 unchangeable)

7.5kHz

12.5kHz 1 0

(BD37513FS:10kHz unchangeable)

0.5

1.0 0 1

1.5 1 0

2.0 1 1

0.75

1.0 0 1

1.25 1 0

1.5 1 1

0.75

1.25 1

fo

10kHz 0 1

15kHz 1 1

MSB Bass Q factor LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 Bass fo 0 0

MSB Middle Q factor LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 Middle fo 0 0

MSB Treble Q factor LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 Treble fo 0 0 0

MSB Treble fo LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0

0 0

Technical Note

0 0

0 0

0 0 0

: Initial condition

0

Treble

Q factor

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Select address 51, 57 (hex)

Gain

0dB
1dB 0 0 0 0 1
2dB 0 0 0 1 0
3dB 0 0 0 1 1
4dB 0 0 1 0 0
5dB 0 0 1 0 1
6dB 0 0 1 1 0
7dB 0 0 1 1 1
8dB 0 1 0 0 0

9dB 0 1 0 0 1
10dB 0 1 0 1 0
11dB 0 1 0 1 1
12dB 0 1 1 0 0
13dB 0 1 1 0 1
14dB 0 1 1 1 0
15dB 0 1 1 1 1
16dB 1 0 0 0 0
17dB 1 0 0 0 1
18dB 1 0 0 1 0
19dB 1 0 0 1 1
20dB 1 0 1 0 0

Prohibition

Mode

Boost 0

Cut 1

MSB Bass/ Treble Gain LSB

D7 D6 D5 D4 D3 D2 D1 D0

Bass/

Treble

Boost

/cut

MSB Bass/ Treble Boost/Cut LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0

0 0 Bass/Treble Gain

Technical Note

0 0 0 0 0

1 0 1 0 1

： ： ： ： ：

1 1 1 1 0
1 1 1 1 1

: Initial condition

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Select address 75 (hex)

Mode

Hicut1
Hicut2 0 1
Hicut3 1 0
Hicut4 1 1

Gain

0dB

1dB 0 0 0 0 1

2dB 0 0 0 1 0

3dB 0 0 0 1 1

4dB 0 0 1 0 0

5dB 0 0 1 0 1

6dB 0 0 1 1 0

7dB 0 0 1 1 1

8dB 0 1 0 0 0

9dB 0 1 0 0 1
10dB 0 1 0 1 0
11dB 0 1 0 1 1
12dB 0 1 1 0 0
13dB 0 1 1 0 1
14dB 0 1 1 1 0
15dB 0 1 1 1 1
16dB 1 0 0 0 0
17dB 1 0 0 0 1
18dB 1 0 0 1 0
19dB 1 0 0 1 1
20dB 1 0 1 0 0

Prohibition

（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.

Item Symbol

Rise time of VCC Trise 33 － － usec VCC rise time from 0V to 5V
VCC voltage of release

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.

MSB Loudness Hicut LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0

0

MSB Loudness Gain LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 0 0

0 Loudness Hicut

1 0 1 0 1

： ： ： ： ：

1 1 1 1 1

Limit

Min. Typ. Max.

Vpor － 4.1 － V

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.

Loudness Gain

Unit Condition

Technical Note

: Initial condition

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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Volume / Fader volume attenuation of the details

(dB)

[phone] 0 0 0 0 1
[phone] 0 0 0 1 0
[phone] 0 0 0 1 1
[phone] 0 0 1 0 0
[phone] 0 0 1 0 1
[phone] 0 0 1 1 0

[phone] 0 1 1 1
[phone] 1 0 0 0
[phone] 1 0 0 1
[phone] 1 0 1 0
[phone] 1 0 1 1
[phone] 1 1 0 0
[phone] 1 1 0 1
[phone] 1 1 1 0
[phone] 1 1 1 1

0 1 0 0 0 0 0 0 0 -48 1 0 1 1 0 0 0 0

-1 1 0 0 0 0 0 0 1 -49 1 0 1 1 0 0 0 1

-2 1 0 0 0 0 0 1 0 -50 1 0 1 1 0 0 1 0

-3 1 0 0 0 0 0 1 1 -51 1 0 1 1 0 0 1 1

-4 1 0 0 0 0 1 0 0 -52 1 0 1 1 0 1 0 0

-5 1 0 0 0 0 1 0 1 -53 1 0 1 1 0 1 0 1

-6 1 0 0 0 0 1 1 0 -54 1 0 1 1 0 1 1 0

-7 1 0 0 0 0 1 1 1 -55 1 0 1 1 0 1 1 1

-8 1 0 0 0 1 0 0 0 -56 1 0 1 1 1 0 0 0

-9 1 0 0 0 1 0 0 1 -57 1 0 1 1 1 0 0 1

-10 1 0 0 0 1 0 1 0 -58 1 0 1 1 1 0 1 0

-11 1 0 0 0 1 0 1 1 -59 1 0 1 1 1 0 1 1

-12 1 0 0 0 1 1 0 0 -60 1 0 1 1 1 1 0 0

-13 1 0 0 0 1 1 0 1 -61 1 0 1 1 1 1 0 1

-14 1 0 0 0 1 1 1 0 -62 1 0 1 1 1 1 1 0

-15 1 0 0 0 1 1 1 1 -63 1 0 1 1 1 1 1 1

-16 1 0 0 1 0 0 0 0 -64 1 1 0 0 0 0 0 0

-17 1 0 0 1 0 0 0 1 -65 1 1 0 0 0 0 0 1

-18 1 0 0 1 0 0 1 0 -66 1 1 0 0 0 0 1 0

-19 1 0 0 1 0 0 1 1 -67 1 1 0 0 0 0 1 1

-20 1 0 0 1 0 1 0 0 -68 1 1 0 0 0 1 0 0

-21 1 0 0 1 0 1 0 1 -69 1 1 0 0 0 1 0 1

-22 1 0 0 1 0 1 1 0 -70 1 1 0 0 0 1 1 0

-23 1 0 0 1 0 1 1 1 -71 1 1 0 0 0 1 1 1

-24 1 0 0 1 1 0 0 0 -72 1 1 0 0 1 0 0 0

-25 1 0 0 1 1 0 0 1 -73 1 1 0 0 1 0 0 1

-26 1 0 0 1 1 0 1 0 -74 1 1 0 0 1 0 1 0

-27 1 0 0 1 1 0 1 1 -75 1 1 0 0 1 0 1 1

-28 1 0 0 1 1 1 0 0 -76 1 1 0 0 1 1 0 0

-29 1 0 0 1 1 1 0 1 -77 1 1 0 0 1 1 0 1

-30 1 0 0 1 1 1 1 0 -78 1 1 0 0 1 1 1 0

-31 1 0 0 1 1 1 1 1 -79 1 1 0 0 1 1 1 1

-32 1 0 1 0 0 0 0 0 -∞ 1 1 1 1 1 1 1 1

About BD37513FS and BD37514FS, Fader Volume only 0dB～-∞dB are available.

D7 D6 D5 D4 D3 D2 D1 D0

(dB)

Technical Note

D7 D6 D5 D4 D3 D2 D1 D0

：Initial condition

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Technical Note

●Application circuit

GND SDA SCL

VCC MUTE

10μ 0.1μ

10μ

10μ 10μ 10μ

OUTR2OUTR1OUTF2OUTF1

2.2K

20 19 18 17 16 15 14 13 12 11

VCC

GND

I2C BUS LOGIC

TEST1

■Fader
Gain:0dB～-79ｄB/1dB step

★no pop noise

■Loudness
20dB～0ｄB/1ｄB step

★no pop noise

・ｆ0=800
・Hicut1/2/3/4

■2 Band EQ (Tone control)
Gain：+20dB～-20dB/1dB

★no pop noise

・Bass：f0=100Hz,

Q=1.0

・Treble：f0=10kHz

Q=1.25

■Volume
Gain:+15dB～-79dB/1dB step

★no pop noise

■Input Gain
Gain:+20dB～0dB/1dB step

★no pop noise

Input selector (3 single-end and 1 stereo ISO)

VCC/2

100k

100k 100k 100k 250k 250k 250k

Fader★

Fader★

★Loudness

★2 Band EQ

(Tone control)

★Volume/Mute

★Input Gain

Fader★

Fader★

GND

ISO am p

GND

ISO am p

250k

250k

1 2 3 4 5 6 7 8 9 10

2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 10μ 2.2μ

10μ

Single1

Single2 Single3

GND Isoration

Unit

R : [Ω]
C : [F]

Fig.22 BD37513FS Application Circuit Diagram

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 I

2

C 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(12pin), please use with OPEN.

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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

GND SDA SCL

20 19 18 17 16 15 14 13 12 11

GND

I2C BUS LOGIC

■Fader
Gain:0dB～-79ｄB/1dB step

★no pop noise

■Loudness
20dB～0ｄB/1ｄB step

★no pop noise

・ｆ0=800
・Hicut1/2/3/4

■2 Band P-EQ (Tone control)
Gain：+20dB～-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～-79dB/1dB step

★no pop noise

■Input Gain
Gain:+20dB～0dB/1dB step

★no pop noise

VCC/2

1 2 3 4 5 6 7 8 9 10

100k

FIL

2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 10μ 2.2μ

10μ

Single1

VCC MUTE

10μ 0.1μ

10μ

10μ 10μ 10μ 10μ

VCC

Fader★

★Loudness

★2 Band P-EQ

(Tone control)

★Volume/Mute

★Input Gain

Input selector (3 single-end and 1 stereo ISO)

100k 100k 100k 250k 250k 250k

Single2 Single3

Fader★

Fader★

Fader★

GND

ISO amp

OUTSOUTR2OUTR1OUTF2OUTF1

Fig.23 BD37514FS

Fader★

Diff

GND

ISO amp

250k

Technical Note

2.2K

250k

Unit

R : [Ω]
C : [F]

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 I

2

C 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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2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

GND SDA SCL

10μ 0.1μ

20 19 18 17 16 15 14 13 12 11

GND

I2C BUS LOGIC

■Fader
Gain:+15dB～-79ｄB/1dB step

★no pop noise

■LPF
fc=55/85/120/160Hz

■Loudness
20dB～0ｄB/1ｄB step

★no pop noise

・ｆ0=800
・Hicut1/2/3/4

■2 Band P-EQ (Tone control)
Gain：+20dB～-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～-79dB/1dB step

★no pop noise

■Input Gain
Gain:+20dB～0dB/1dB step

★no pop noise

Input selector (3 single-end and 1 stereo ISO)

VCC/2

100k

100k 100k 100k 250k 250k 250k

1 2 3 4 5 6 7 8 9 10

FIL

10μ

2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 2.2μ 10μ 2.2μ

Single1

VCC MUTE

10μ

10μ 10μ 10μ 10μ

VCC

Fader★

★Loudness

★2 Band P-EQ

(Tone control)

★Volume/Mute

★Input Gain

Single2 Single3

Fader★

Fader★

Fader★

GND

ISO amp

OUTSOUTR2OUTR1OUTF2OUTF1

LPF

Diff

Fader★

ISO amp

250k

GND

Fig.24 BD37515FS

Technical Note

2.2K

250k

Unit

R : [Ω]
C : [F]

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 I

2

C 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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© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

●Interfaces

Terminal

No.

2
3
4
5

Terminal

Name

A1
A2
B1
B2

Terminal

voltage

Vcc

4.25

GN D

Technical Note

Equivalent Circuit Terminal Description

A terminal for signal input.
The input impedance is 100kΩ(typ).

100k

6
7

8
9

10

C1
C2

DP1

DN

DP2

4.25

4.25

11 MUTE ―

Vcc

GN D

Vcc

GN D

Vcc

250k

250ｋ

A terminal for signal input.
The input impedance is 250kΩ(typ).

Input terminal available to
Single/Differential mode.
The input impedance is 250kΩ(typ).

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.

1.65V

GND

12
13
14
15
16

OUTS
OUTR2
OUTR1
OUTF2
OUTF1

4.25

VCC

GND

A terminal for fader and Subwoofer output.
(12pin:OUTS is only in BD37514FS,
BD37515FS)

The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn’t guarantee
the value.

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25/29

© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

Terminal

No.

17 VCC 8.5

18 SCL －

19 SDA －

Terminal

Name

Terminal

voltage

Vcc

GND

Vcc

Technical Note

Equivalent Circuit Terminal Description

Power supply terminal.

1.65V

A terminal for clock input of I
communication.

A terminal for data input of I2C BUS
communication.

2

C BUS

1.65V

GND

20 GND 0

1 FIL 4.25

12

The figure in the pin explanation and input/output equivalent circuit is reference value, it doesn’t guarantee
the value.

TEST -

Vcc

GND

50k

50k

Ground terminal.

1/2 VCC terminal.

Voltage for reference bias of analog
signal system. The simple precharge
circuit and simple discharge circuit for
an external capacitor are built in.

TEST terminal(BD37513FS)

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26/29

© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

●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 (17pin),
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.

C〔F〕

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 S

3. About Mute terminal(11pin) when power supply is off

Any voltage shall not be supplied to Mute terminal (11pin) 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 BD37513FS, 12pin is TEST Pin.

INPUT

RIN

〔Ω〕

Ｓ

Ｓ

and makes it low impedance, please use it at the time of a non-signal.

SH

G〔dB〕

0

A(f)

A(f)

Technical Note

f〔Hz〕

2

IN

)(2πfCR

2

(2πfCR1

IN)

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27/29

© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

●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.

Power dissipation values vary according to the board on which the IC is mounted.

Reference data

1.5

1.0

0.94W

SSOP-A20

Measurement condition: ROHM Standard board
board Size：70×70×1.6(㎣)
material：A FR4 grass epoxy board

(3% or less of copper foil area)

θja = 133℃/W

0.5

Power Dissipation Pd（W）

0.0
0 25 50 75 100 125

85

Ambient Temperature Ta（℃）

Fig.25 Temperature Derating Curve

Note) Values are actual measurements and are not guaranteed.

150

Technical Note

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28/29

© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37513FS,BD37514FS,BD37515FS

●Ordering part number

B D 3 7 5 1 3 F S - E 2

Part No. Part No.

37513
37514
37515

SSOP-A20

8.7± 0.2

(MAX 9.05 include BURR)

20

11

7.8± 0.3

5.4± 0.2

0.3MIN

1

1.8± 0.1

0.11

0.8

10

0.36± 0.1

0.1

0.15± 0.1

(Unit : mm)

Package

FS : SSOP-A20

<Tape and Reel information>

Embossed carrier tapeTape

Quantity

Direction
of feed

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

Reel

1pin

Order quantity needs to be multiple of the minimum quantity.

∗

Packaging and forming specification
E2: Embossed tape and reel

Technical Note

Direction of feed

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29/29

© 2010 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

Notes

No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.

The content specied herein is subject to change for improvement without notice.

The content specied 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 specications,
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 specied 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 specied 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.

Notice

The Products specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, ofce-automation equipment, commu­nication devices, electronic appliances and amusement devices).

The Products specied in this document are not designed to be radiation tolerant.

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, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel­controller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology specied herein that may
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obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System

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R1010

A