ROHM BD37524FS Technical data

Sound Processor Series for Car Audio

Sound Processor with Built-in
3-band Equalizer

BD37524FS

No.10085EAT05

●Description
BD37524FS is sound processors built-in 3-band equalizer for car audio. The functions are stereo 5ch input selector,
input-gain control, main volume, loudness, 5ch fader volume, LPF for subwoofer, level meter. 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 4 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 3-band equalizer filter, LPF for subwoofer, loudness filter.
And, possible to control Q, Gv, fo of 3-band equalizer and fc of LPF, fo, Gv of loudness by I

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

7) Terminals for the subwoofer outputs are equipped.

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-A24. 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 freely

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2010.03 - Rev.A

BD37524FS

●Line up matrix

Function Specifications

Input selector

Input gain

Mute ・Possible to use “Advanced switch” for prevention of switching noise.

Volume

Bass

Middle

Treble

Fader

Loudness

LPF

Level meter

●Absolute maximum ratings (Ta=25℃)

・Stereo 4 input
・Differential 1 input
・0～20dB（1dB step）
・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 variable
・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 variable
・fo=500, 1k, 1.5k, 2.5kHz variable
・Possible to use “Advanced switch” at changing gain
・-20～+20dB（1dB step）
・Q=0.75, 1.25 variable
・fo=7.5k, 10k, 12.5k, 15kHz variable
・Possible to use “Advanced switch” at changing gain
・+15dB～-79dB(1dB step), -∞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°)
・I2C BUS control
・DC Output

Technical Note

Item Symbol Rating Unit

Power supply Voltage VCC 10.0 V

Input voltage Vin

Power Dissipation Pd 1000 ※1 mW

Storage Temperature Ta stg -55～+150 ℃

※This value decreases 8mW/℃ for Ta=25℃ or more.
ROHM standard board shall be mounted.
Thermal resistance θja = 125(℃/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

VCC+0.3～GND-0.3

V

℃

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2010.03 - Rev.A

BD37524FS

Technical Note

●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, Fader 0dB)

Limit

BLOCK

Item Symbol

Min. Typ. Max.

Unit Condition

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 CB -1.5 0 1.5 dB CB = GV1-GV2
T otal harmonic distortion 1

(FRONT,REAR)
T otal harmonic distortion 2

(SUBWOOFER)
Output noise voltage 1
(FRONT,REAR)＊
Output noise voltage 2
(SUBWOOFER)＊

GENERAL

THD+N1 － 0.001 0.05 ％
THD+N2 － 0.002 0.05 ％

V

V

Residual output noise voltage＊ V

－ 3.8 15 μVrms

NO1

－ 4.8 15 μVrms

NO2

－ 1.8 10 μVrms

NOR

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

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

CTC=20log(VOUT/VIN)
BW = IHF-A
f=1kHz

Ripple rejection RR － -70 -40 dB

VRR=100mVrms

RR=20log(VCC IN/VOUT)
Input impedance(A, B) R
Input impedance (C,D,E) R

Maximum input voltage VIM 2.1 2.3 － Vrms

70 100 130 kΩ

IN_S

175 250 325 kΩ

IN_D

VIM at THD+N(VOUT)=1％

BW=400-30KHz

Rg = 0Ω
Cross-talk between selectors＊ CTS － -100 -90 dB

CTS=20log(VOUT/VIN)

BW = IHF-A

INPUT SELECTOR

Common mode rejection ratio＊ CMRR 50 65 － dB

CP1 and CN input

CP2 and CN input

CMRR=20log(VIN/VOUT)

BW = IHF-A

Input gain 0dB
Minimum input gain G

-2 0 +2 dB

IN MIN

VIN=100mVrms

Gin=20log(VOUT/VIN)

Input gain 20dB
Maximum input gain G

INPUT GAIN

Gain set error G

18 20 22 dB

IN MAX

VIN=100mVrms

Gin=20log(VOUT/VIN)

-2 0 +2 dB GAIN=+20～+1dB

IN ERR

Mute ON
Mute attenuation＊ G

MUTE

－ -105 -85 dB

MUTE

Gmute=20log(VOUT/VIN)

BW = IHF-A

Volume = 15dB
Maximum gain G

13 15 17 dB

V MAX

VIN=100mVrms

Gv=20log(VOUT/VIN)

Volume = -∞dB
Maximum attenuation＊ G

VOLUME

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

－ -100 -85 dB

V MIN

-2 0 2 dB GAIN & ATT=+15dB～-15dB

-3 0 3 dB ATT=-16dB～-47dB

-4 0 4 dB ATT=-48dB～-79dB

G

V ERR1
V ERR2
V ERR3

Gv=20log(VOUT/VIN)

BW = IHF-A

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2010.03 - Rev.A

BD37524FS

BLOCK

Maximum boost gain

BASS

Maximum cut gain

Gain set error

Maximum boost gain

MIDDLE

Maximum cut gain

Gain set error

Maximum boost gain

TREBLE

Maximum cut gain

Gain set error

Maximum boost gain G

Maximum attenuation＊

Gain set error
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
Maximum output voltage V

Level

meter

Output offset voltage V

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

M BST

G

M CUT

G

M ERR

G

T BST

G

T CUT

G

T ERR

F BST

G

F MIN

G

F ERR

G

F ERR1

G

F ERR2

G

F ERR3

R

OUT

V

OM

G

L MAX

G

L ERR

L MAX

L OFF

Min. Typ. Max.

18 20 22 dB

-22 -20 -18 dB

18 20 22 dB

-22 -20 -18 dB

17 20 23 dB

-23 -20 -17 dB

-2 0 2 dB

13 15 17 dB

－

- － 50 Ω VIN=100mVrms

2 2.2

17 20 23 dB

-2 0 2 dB GAIN=+20～+1dB

2.8 3.1 3.5 V
－

Limit

Unit Condition

-2 0 2 dB Gain=-20～+20dB f=100Hz

-2 0 2 dB Gain=-20～+20dB f=1kHz

-100 -90 dB

-2 0 2 dB Gain=+1～+15dB

-2 0 2 dB ATT=-1～-15dB

-3 0 3 dB

-4 0 4 dB ATT=-48～-79dB

－

Vrms

0 100 mV

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=1kHz
VIN=100mVrms
GM=20log (VOUT/VIN)
Gain=-20dB f=1kHz
VIN=2Vrms
GM=20log (VOUT/VIN)

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

Gain=-20dB f=10kHz
VIN=2Vrms
G

=20log (VOUT/VIN)

T

Gain=-20～+20dB f=10kHz
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

BD37524FS

%

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
20
15
10

5
0

-5

Gain[dB]

-1 0

-1 5

-2 0

-2 5

10 100 1k 10k 100k

MIDDLE GAIN :

-20～+20dB /1dB step

Frequency [Hz]

fo : 500Hz
Q : 0.75

Fig.7 Middle Gain vs Freq

10

1

0.1

THD+N (

THD+N[%]

0.01

0.001

0.0 0 1 0 .0 1 0.1 1 10

25
20
15
10

5

Gain[dB]

0

-5

-1 0

-1 5

-2 0

-2 5
10 100 1k 10k 100k

Vout [Vrms]

Fig.2 Thd vs Vo

Frequency [Hz]

Fig.5 Bass fo vs Freq

25
20
15
10

5
0

-5

Gain[dB]

-1 0

-1 5

-2 0

-2 5
10 100 1k 10k 100k

Frequency [Hz]

Fig.8 Middle fo vs Freq Fig.9 Middle Q vs Freq

10kHz

1kHz

100Hz

Vout (V)

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

fo : 500/1k/1.5k/2.5kHz

10

1

0.1

0.01

0.001

5
4
3

Vo

Vin[Vrms]

2
1
0

Gain[dB]

Gain (

-1

10 100 1k 10k 100k

-2

-3

-4

-5

Fig.3 Gain vs Freq

Fig.12 Gain vs Freq

25
20
15
10

5
0

Gain[dB]

-5

-1 0

-1 5

-2 0

-2 5
10 100 1k 10k 100k

Gain=0dB

Frequency [Hz]

Frequency (Hz)

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

Frequency [Hz]

Fig.6 Bass Q vs Freq

25
20
15
10

5
0

-5

Gain[dB]

-10

-15

-20

-25
10 100 1k 10k 100k

Q : 0.75/1/1.25/1.5

Frequency [Hz]

MIDDLE GAIN :
±20dB
fo : 1kHz

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

Frequency [Hz]

Frequency (Hz)

25

fo : 7.5k/10k/12.5k/15kHz
TREBLE GAIN : ±20dB

20

Q : 0.75

15
10

5
0

Output

-5

Noise[uVrm

-10

-15

-20

-25
10 100 1k 10k 100k

Frequency [Hz]

Fig.10 Treble Gain vs Freq Fig.11 Treble fo vs Freq Fig.12 Treble Q vs Freq

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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)

2010.03 - Rev.A

BD37524FS

B

g

1000

100

Din-Audio IHF-A

1000

100

DIN-Audio IHF-A

Technical Note

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.13 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
Treble Gain [dB]

Fig.16 Treble Gain vs Noise

10

Output Noise[uVrms]

出力雑音電圧 [uVrms]

1

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

0

-1 0

-2 0

-3 0

Gain[dB]

-4 0

Gain (d

-5 0

-6 0

-7 0
10 100 1k 10k 100k

Bass Gain [dB]

.14 Bass Gain vs Noise

Fi

Frequency [Hz]

Frequency (Hz)

Fig.17 CMRR vs Freq

10

出力雑音電圧 [uVrms]

1

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

Fig.15 Middle Gain vs Noise

2.5

2.0

1.5

1.0

Vo [Vrms]

最大出力[Vrms]

0.5

0.0
100 1000 10000 100000

Rload [ohm]

出力負荷[ohm]

Fig.18 Rload vs Vo

3.5

3

2.5

2

1.5

Vout[V]

1

0.5

0

00.511.522.53

Vin [Vrms]

Fig.19 Advanced Switch 1

Fig.20 Advanced Switch 2 Fig.21 Level Meter Vin vs Vo

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2010.03 - Rev.A

BD37524FS

●Block diagram and pin configuration

GND

I2C BUS LOGIC

VCC

■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
・Hicut:1/2/3/4

■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

Fader★

Fader★

★Loudness

★3 Band P-EQ

(Tone control)

★Volume/Mute

★Input Gain

Input selector (4 single-end and 1 stereo ISO)

VCC/2

100k 100k 100k 100k 250k

1 2 3 4 5 6 7 8

ISO amp

Fig.22 BD37524FS

Descriptions of terminal

Terminal

No.

Terminal

Name

Description

1 FIL VCC/2 terminal 13 MUTE External compulsory mute terminal
2 A1 A input terminal of 1ch 14 LOUT Output terminal for Level meter
3 A2 A input terminal of 2ch 15 OUTS2 Subwoofer output terminal of 2ch
4 B1 B input terminal of 1ch 16 OUTS1 Subwoofer output terminal of 1ch
5 B2 B input terminal of 2ch 17 OUTR2 Rear output terminal of 2ch
6 CP1 C positive input terminal of 1ch 18 OUTR1 Rear output terminal of 1ch
7 CN C negative input terminal 19 OUTF2 Front output terminal of 2ch
8 CP2 C positive input terminal of 2ch 20 OUTF1 Front output terminal of 1ch

9 D1 D input terminal of 1ch 21 VCC Power supply terminal
10 D2
11 E1
12 E2

D input terminal of 2ch
E input terminal of 1ch
E input terminal of 2ch

GND

Technical Note

14

1324 23 22 21 20 19 18 17 16 15

Fader★

Fader★

GND

ISO amp

250k250k 250k 250k 250k 250k

Terminal

No.

22 SCL I2C Communication clock terminal
23 SDA I2C Communication data terminal
24 GND GND terminal

Fader★

LPF

9

Terminal

Name

Level
meter

10 11 12

Description

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2010.03 - Rev.A

BD37524FS

Technical Note

●Timming Chart

CONTROL SIGNAL SPECIFICATION

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

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

2

Fig.23 Definition of timing on the I

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

2

C-bus devices

C-bus

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

Parameter Symbol

Fast-mode I2C-bus

Min. Max.

1 SCL clock frequency ｆSCL 0

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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BD37524FS

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

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

SCL clock frequency：250kHz

Fig.24 A command timing example in the I2C data transmission

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2010.03 - Rev.A

BD37524FS

（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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2010.03 - Rev.A

BD37524FS

（５）Select Address & Data

Items

Initial setup 1 01

Initial setup 2 02

Initial setup 3 03 0 0 0 Loudness fo 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
Middle setup 44 0 0 Middle fo 0 0 Middle Q
Treble setup 47 0 0 Treble fo 0 0 0 Treble Q

Bass gain 51

Middle gain 54

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, 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.

Select

Address

(hex)

→01→02→03→05→06→20→28→29→2A→2B→2C

→41→44→47→51→54→57→75

MSB Data LSB

D7 D6 D5 D4 D3 D2 D1 D0

Advanced

switch
ON/OFF

LPF

Phase

Mute

ON/OFF

Bass

Boost/

Cut
Middle
Boost/

Cut
Treble
Boost/

Cut

0

Level
Meter
RESET

0 0

0 0 Bass Gain

0 0 Middle Gain

0 0 Treble Gain

Advanced switch time
of Input Gain/Volume

Tone/Fader/Loudness

0 0 0

0 0

Subwoofer

LPF fc

Input Gain

Technical Note

Advanced switch time

of Mute

LPF

Phase

Advanced switch

Level
Meter
RESET

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

2010.03 - Rev.A

BD37524FS

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

Mode

HOLD

RESET 1

Phase

0° 0

180° 1

Select address 03(hex)

f0

250Hz
400Hz 0 1
800Hz 1 0

Prohibition 1 1

Technical Note

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

MSB Level Meter RESET LSB

D7 D6 D5 D4 D3 D2 D1 D0

LPF Phase

MSB LPF Phase LSB

D7 D6 D5 D4 D3 D2 D1 D0

MSB Loudness fo LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0

0

Input gain/Volume/Tone/Fader/Loudness

0

0

Level
Meter
RESET

0

Level
Meter
RESET

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 Subwoofer LPF fc

0 0 0 Subwoofer LPF fc

0 0

0 0

0 0

0 0

0 0 0

0 0 1

: Initial condition

0 0

Advanced switch Time

of Mute

Advanced switch

Time of Mute

LSB

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

2010.03 - Rev.A

BD37524FS

Select address 05(hex)

Mode

A A1 A2
B B1 B2 0 0 1 0

C diff CP1 CP2 0 1 1 0

D D1 D2 1 0 1 0
E E1 E2 1 0 1 1

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

Select address 06 (hex)

OUT

F1/R1

Input SHORT 1 0 0 1
Prohibition Other setting

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

OUT

F2/R2

(For quick charge of coupling capacitor)

MSB Input Selector LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 1

0 0 0 0

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

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 ROHM Co., Ltd. All rights reserved.

2010.03 - Rev.A

BD37524FS

Select address 20, 28, 29, 2A, 2B, 2C (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

：

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

Technical Note

: Initial condition

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

2010.03 - Rev.A

BD37524FS

Select address 41(hex)

Q factor

0.5

1.0 0 1

1.5 1 0

2.0 1 1

fo

60Hz
80Hz 0 1

100Hz 1 0
120Hz 1 1

Select address 44(hex)

Q factor

0.75

1.0 0 1

1.25 1 0

1.5 1 1

fo

500Hz

1kHz 0 1

1.5kHz 1 0

2.5kHz 1 1

Select address 47 (hex)

Q factor

0.75

1.25 1

fo

7.5kHz
10kHz 0 1

12.5kHz 1 0
15kHz 1 1

Technical Note

MSB Bass Q factor LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0

0 0 Bass fo 0 0

MSB Bass fo LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0

0 0

MSB Middle Q factor LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 Middle fo 0 0

MSB Middle fo LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0

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

0 0

0 0

0 0 0

: Initial condition

Bass

Q factor

0 0

Middle

Q factor

Treble

Q factor

0

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

2010.03 - Rev.A

BD37524FS

Select address 51, 54, 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

Technical Note

MSB Bass/ Middle/ Treble Gain LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 0 0

Bass/

Middle/

Treble

Boost

/cut

MSB Bass/ Middle/ Treble Boost/Cut LSB

D7 D6 D5 D4 D3 D2 D1 D0

0 0

1 0 1 0 1

： ： ： ： ：

1 1 1 1 0
1 1 1 1 1

0 0 Bass/Middle/Treble Gain

: Initial condition

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

2010.03 - Rev.A

BD37524FS

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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17/25

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

2010.03 - Rev.A

BD37524FS

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

D7 D6 D5 D4 D3 D2 D1 D0

Technical Note

(dB)

D7 D6 D5 D4 D3 D2 D1 D0

：Initial condition

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

2010.03 - Rev.A

BD37524FS

※

RESET

HOLD

About Level meter

（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 I
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 I

I2CBUS

2

(RESET)

1

80

LOUT [ V ]

START

C BUS

02

40

2

C BUS

(HOLD)

80

02

START

Technical Note

00

Wait time
(25msec)

fin＝40Hz

detect

t

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19/25

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

2010.03 - Rev.A

BD37524FS

●Application circuit

GND SDA SCL MUTE

10μ 0.1μ

OUTF1 OUTF2 OUTR1 OUTR2 OUTS1 OUTS2

VCC

10μ

10μ 10μ 10μ 10μ 10μ

GND

I2C BUS LOGIC

VCC

■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
・Hicut:1/2/3/4

■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

Fader★

Fader★

★Loudness

★3 Band P-EQ

(Tone control)

★Volume/Mute

★Input Gain

Fader★

Fader★

VCC/2

100k 100k 100k 100k 250k

1 2 3 4 5 6 7 8

2.2μ 2.2μ 2.2μ 2.2μ 2.2μ

10μ

Single1 Single2

Input selector (4 single-end and 1 stereo ISO)

GND

ISO amp

GND Isolation

GND

ISO amp

250k250k 250k 250k 250k 250k

10μ

2.2μ 1μ 1μ 1μ 1μ

Fig.25 Application Circuit Diagram

Fader★

LPF

10 11 12

9

Single3

LOUT

Level

meter

14

Single4

Technical Note

1324 23 22 21 20 19 18 17 16 15

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

BD37524FS

●Interfaces

Terminal

No.

Terminal

Name

Terminal

Voltage

Technical Note

Equivalent Circuit Terminal Description

Vcc

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

2
3
4
5

6
7
8

9
10
11
12

A1
A2
B1
B2

CP1

CN

CP2

D1
D2
E1
E2

4.25

4.25

13 MUTE －

GND

GND

Vcc

Vcc

100K

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

250k

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

CC

V

A terminal for fader and Subwoofer output.

16
17
18
19
20

OUTS1
OUTR2
OUTR1
OUTF2
OUTF1

4.25

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

2010.03 - Rev.A

BD37524FS

Terminal

No.

Terminal

Name

21 VCC 8.5

Terminal

Voltage

Technical Note

Equivalent Circuit Terminal Description

Power supply terminal.

Vcc

22 SCL －

GND

Vcc

23 SDA －

GND

24 GND 0

Vcc

50k

1 FIL 4.25

2

A terminal for clock input of I

C BUS

communication.

1.65V

A terminal for data input of I2C BUS
communication.

1.65V

Ground terminal.

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

50k

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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22/25

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

2010.03 - Rev.A

BD37524FS

●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 (21pin),
please do not impress the large and over the absolute maximum rating voltage (including a operating voltage
+ serge ingredient (around 14V)).

RIN

Ｓ

Ｓ

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

3. About Mute terminal(13pin) when power supply is off

Any voltage shall not be supplied to Mute terminal (13pin) 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.)

INPUT

〔Ω〕

G〔dB〕

0

A(f)

A(f)

Technical Note

f〔Hz〕

2

IN

)(2πfCR

2

(2πfCR1

IN)

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

2010.03 - Rev.A

BD37524FS

●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

1.0W

SSOP-A24

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 = 125℃/W

0.5

Power Dissipation Pd（W）

0.0
0 25 50 75 100 125

85

Ambient Temperature Ta（℃）

Fig.26 Temperature Derating Curve

Note) Values are actual measurements and are not guaranteed.

150

Technical Note

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

2010.03 - Rev.A

BD37524FS

●Ordering part number

B D 3 7 5 2 4 F S - E 2

Part No. Part No.

37524

SSOP-A24

24

10± 0.2

(MAX 10.35 include BURR)

13

+6°

4°

−4°

7.8± 0.3

5.4± 0.2

0.5± 0.2

1.2± 0.15

1

1.8±0.1

0.8

0.1±0.1

12

0.1

0.38±0.1

+0.1

0.17

−0.05

(Unit : mm)

Package

FS : SSOP-A24

<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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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 ef forts 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
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
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