BD3491FS-E2_技术文档

Datasheet

Analog Sound Processor series

Sound Processor with Built-in

Surround Sound Function

BD3491FS

General Description

Key Specification

Built in stereo 6 input selectors and volume that there is

not an impedance change of a volume terminal. And this

is sound processor can realize 2-band equalizer

(Bass/Treble, Gain±14dB / 2dB_step) and BassBoost,

Output gain, Surround by external components.

ꢀ Current upon no signal:

ꢀ TotalHarmonic Distortion:

ꢀ Maximum Input Voltage:

ꢀ Crosstalk between Selectors:

ꢀ Volume Control Range:

ꢀ Output Noise Voltage:

7mA(typ)

0.002%(typ)

2.4Vrms(typ)

100dB(typ)

0dB to -87dB

5µVrms(typ)

-40℃ to +85℃

ꢀ Residual Output Noise Voltage:

ꢀ Operating Temperature Range:

Features

ꢀ Equipped with 6 single ended stereo input

selectors

ꢀ Built-in input gain controller suitable for mobile audio.

ꢀ Volume input terminal can be used as a microphone

input terminal since its impedance remains constant

even if volume setting is changed.

Package

SSOP-A32

W(typ) x D(typ) x H(max)

13.60mm x 7.80mm x 2.01mm

ꢀ Bi-CMOS process is suitable for the design of low

current and low energy. It also provides more quality

for Bi-CMOS small scale regulator and heat in a set.

ꢀ The package of this IC is SSOP-A32. Sound input

terminals and output terminals arrangement is

optimized for easy and fast layout of PCB pattern. At

the same time, it minimizes PCB area.

Applications

ꢀ Suitable for mini-components or micro components.

Used for audio equipment of TV, DVD, etc.

SSOP-A32

Typical Application Circuit

Figure 1. Application Circuit Diagram

○Product structure：Silicon monolithic integrated circuit ○This product is not designed for protection against radioactive rays

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Datasheet

BD3491FS

Pin Configuration

B1

1

32 A1

B2

C1

C2

2

3

4

31 A2

30 FIL

29 GND

28 SDA

D1

D2

E1

5

6

7

27 SCL

26 VCC

25 OUT1

24 SB1

23 SR

E2

F1

8

9

F2 10

SEL2 11

SEL1 12

VOL1 13

VOL2 14

22 SB2

21 OUT2

20 BCB1

19 BCA1

18 BCA2

17 BCB2

TC2 15

TC1 16

Figure 2. Pin Configuration

Pin Descriptions

Terminal

Number

Terminal

Name

Terminal

Number

Terminal

Description

Name

BCB2

BCA2

1

2

B1

B2

Ch1 of B input terminal

Ch2 of B input terminal

Ch1 of C input terminal

Ch2 of C input terminal

Ch1 of D input terminal

Ch2 of D input terminal

Ch1 of E input terminal

Ch2 of E input terminal

Ch1 of F input terminal

Ch2 of F input terminal

Ch2 of selector output terminal

Ch1 of selector output terminal

Ch1 of Volume input terminal

Ch2 of Volume input terminal

Ch2 of Treble filter terminal

Ch1 of Treble filter terminal

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

Ch2 of Bass filter terminal

Ch1 of Bass filter terminal

Ch2 of Output terminal

Ch2 of Bass boost terminal

Surround terminal

3

C1

BCA1

BCB1

OUT2

SB2

SR

4

C2

5

D1

6

D2

7

E1

8

E2

SB1

OUT1

VCC

SCL

SDA

GND

FIL

Ch1 of Bass boost terminal

Ch1 of Output terminal

Power supply terminal

9

F1

10

11

12

13

14

15

16

F2

SEL2

SEL1

VOL1

VOL2

TC2

TC1

Serial communication clock terminal

Serial communication data terminal

GND terminal

VCC/2 terminal

A2

Ch2 of A input terminal

Ch1 of A input terminal

A1

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Datasheet

BD3491FS

Block Diagram

Figure 3. Block Diagram

Absolute Maximum Ratings

Parameter

Symbol

Limits

10.0

Unit

V

Power supply Voltage

Input Voltage

VCC

Vin

VCC+0.3 to GND-0.3

SCL,SDA only 7 to GND-0.3

V

Power Dissipation

Pd

0.95 ※1

W

Storage Temperature

Tastg

-55 to +150

℃

※1 Derate by 7.6mW/℃ for Ta=25℃ or more.

ROHM standard board shall be mounted. Thermal resistance θja = 131.6(℃/W)。

ROHM standard board

Size:70×70×1.6(㎣)

Material: A FR4 grass epoxy board (3% or less of copper foil area)

Operating Range

Parameter

Power supply voltage

Temperature

Symbol

VCC

Limits

Unit

V

4.75 to 9.5

-40 to +85

Topr

℃

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Datasheet

BD3491FS

Electrical Characteristics

(Unless specified particularly, Ta=25℃, VCC=9.0V, f=1kHz, Vin=1Vrms, Rg=600Ω, RL=10kΩ, A input, Input gain 0dB,

Volume 0dB, Bass 0dB, Treble 0dB, Surround Mode OFF, Surround Gain = OFF)

Limit

Item

Current upon no signal

Voltage Gain

Symbol

I_Q

Unit

mA

Condition

Min.

Typ.

Max.

15

－

7

No signal

G_V

-1.5

－

0

+1.5

0.1

dB

Gv=20log(Vout/Vin)

CB = G_V1-G_V2

Channel Balance

CB

dB

Vout=1Vrms

BW=400-30kHz

TotalHarmonic Distortion

Output Noise Voltage

Residual Output Noise Voltage

Crosstalk between Channels

Input Impedance

THD+N

V_NO

0.002

5

％

Rg = 0Ω

－

20

µVrms

BW = IHF-A

Rg = 0Ω

V_NOR

CTC

R_IN

－

5

20

µVrms BW = IHF-A

Volume = -∞

Rg = 0Ω

－

-100

50

-80

65

dB

kΩ

CTC=20log(Vout2/Vout1)

BW = IHF-A

35

V_IMat THD+N(Vout)=1％

BW=400-30kHz

Maximum Input Voltage

Crosstalk between Selectors

Control Range

V_IM

2.1

－

2.4

-100

-87

-100

14

-

Vrms

dB

Rg = 0Ω

CTS=20log(Vout/Vin)

BW = IHF-A

CTS

G_{V MAX}

G_{V MIN}

G_{B BST}

G_{B CUT}

G_{T BST}

G_{T CUT}

-84

-80

16.5

-11.5

16.5

-11.5

Vin=2Vrms

Gv=20log(Vout/Vin)

-90

－

dB

Volume = -∞

Gv=20log(Vout/Vin)

Maximum Attenuation

Maximum Boost Gain

Maximum Cut Gain

dB

Gain = 14dB, f = 100Hz

Vin=100mVrms

Gv=20log(Vout/Vin)

11.5

-16.5

11.5

-16.5

dB

Gain = -14dB, f = 100Hz

Vin=2Vrms

Gv=20log(Vout/Vin)

-14

14

dB

Gain = 14dB, f = 10kHz

Vin=100mVrms

Gv=20log(Vout/Vin)

Maximum Boost Gain

dB

Gain = -14dB, f = 10kHz

Vin=2Vrms

Maximum Cut Gain

-14

dB

Gv=20log(Vout/Vin)

※Phase between input / output is same.

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Datasheet

BD3491FS

Typical Performance Curves

8

7

6

5

4

3

2

5

4

3

2

Operating range

1

0

-1

-2

-3

-4

-5

1

0

2

4

6

8

10

100

1000

10000

100000

VCC [V]

Frequency[Hz]

Figure 4. Vcc vs. Iq

Figure 5. Gain vs. Frequency

10.000

1.000

0.100

0.010

0.001

10.000

1.000

0.100

0.010

0.001

22

20

18

16

14

10kHz

1 kHz

100Hz

12

10

8

6

4

2

0

-2

10

100

1000

10000

100000

0.001

0.010

0.100

1.000

10.000

Frequency[Hz]

Vin [Vrms]

Figure 6. THD+N,Vo vs. Vin

Figure 7. Input Gain vs. Frequency.

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Datasheet

BD3491FS

5

0

-30

-40

Measurement filter

= 30kHz_LPF

Measurement filter

= 30kHz_LPF

-5

-50

-10

-15

Volume setting = -41 to -87dB

Volume setting = 0 to -40dB

-60

-20

-25

-30

-35

-40

-70

-80

-90

Volume setting = -∞

-100

-110

-45

10

100

1000

10000

100000

10

100

1000

10000

100000

Frequency [Hz]

Figure 9. Volume Attenuation 2

Figure 8. Volume Attenuation 1

16

14

12

10

8

180

135

90

16

14

12

10

8

High

Middle

45

Middle

0

6

-45

-90

-135

Low

Off

4

Gain

4

2

0

Phase

0

-180

-2

10

100

1000

10000

100000

10

100

1000

10000

100000

Frequency [Hz]

Figure 10. Output Gain vs. Frequency

Figure 11. BassBoost & Surround

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Datasheet

BD3491FS

CONTROL SIGNAL SPECIFICATION

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

SDA

^tBUF

^tHD;STA

^tF

^tSP

^tR

^tLOW

SCL

^tSU;STO

^tHD;STA

^tSU;DAT ^tSU;STA

^tHD;DAT

^tHIGH

Sr

S

P

Figure 12. Definition of timing on the I²C-BUS

Table 1. Characteristics of the SDA and SCL bus lines for I²C-BUS devices

Parameter

Fast-mode

Min. Max.

400

Symbol

Unit

kHz

1

2

SCL clock frequency

fSCL

tBUF

0

Bus free time between a STOP and START condition

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

pulse is generated

1.3

－

µs

3

tHD;STA

0.6

－

µs

4

5

6

7

8

9

LOW period of the SCL clock

tLOW

1.3

0.6

－

µs

ns

µs

HIGH period of the SCL clock

Set-up time for a repeated START condition

Data hold time

tHIGH

tSU;STA

tHD;DAT

tSU;DAT

tSU;STO

0.6

300*

0.6

Data set-up time

Set-up time for STOP condition

All values referred to VIH min and VIL max levels (see Table 2).

*About 7(tHD;DAT), 8(tSU;DAT), make it the setup which a margin is fully in .

Table 2. Characteristics of the SDA and SCL I/O stages for I²C-BUS devices

Parameter

Fast-mode

Symbol

Unit

Min.

-0.3

2.3

0

Max.

1

10

LOW level input voltage:

VIL

VIH

tSP

V

11 HIGH level input voltage:

5

12 Pulse width of spikes which must be suppressed by the input filter.

50

ns

LOW level output voltage (open drain or open collector): at 3mA sink

current.

13

VOL1

Ii

0

0.4

10

V

Input current in each I/O pin with an input voltage between 0.4V and

4.5V.

14

-10

µA

SCL clock frequency:250kHz

Figure 13. A command timing example in the I²C data transmission.

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Datasheet

BD3491FS

(2) I²C-BUS FORMAT

MSB

Slave Address

8bit

LSB

MSB

Select Address

8bit

LSB

MSB

LSB

S

1bit

A

1bit

A

1bit

Data

8bit

A

P

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

P

= Data on every volume and tone.

= Stop condition (Recognition of stop bit)

(3) I²C-BUS Interface Protocol

1) Basic form

S

Slave Address

MSB LSB

A

Select Address

MSB LSB

A

Data

A

P

MSB LSB

2) Automatic increment (Assigned select Address is increased according to the number of data.)

S

Slave Address

A

Select Address

A

Data1

A

Data2

A ････

DataN

A

P

MSB LSB

No.1. Data1 is set as data of address specified by Select Address.

No.2. Data2 is set as data of next address from the address specified by No.1.

No.3. DataN is set as data of address incremented N-1 times from the address specified by No.1.

Circulation of Select Address by the automatic increment function is shown below.

→

04→

06→

21

→

22

→

51→

57→

78

3) Configuration unavailable for transmission (In this case, only Select Address1 is set properly.)

S

Slave Address

MSB LSB

A

Select Address1

MSB LSB

A

Data

MSB LSB MSB

A

Select Address 2

A

Data

A P

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.

(4) Slave Address

MSB

LSB

R/W

A6

1

A5

A4

0

A3

0

A2

0

A1

0

A0

1

0

82H

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Datasheet

BD3491FS

(5) Select Address & Data

Select

MSB

Data

LSB

Address

(hex)

Items

D7

D6

0

D5

0

D4

D3

D2

D1

D0

0

1

0

Input Selector

Input Gain

04

06

21

22

51

57

78

F0

FE

Input Selector

0

Input Gain

0

Volume Gain 1ch

Volume Gain 2ch

Bass Gain

Volume Attenuation 1ch

Volume Attenuation 2ch

Bass

Boost/Cut

0

Bass Gain

0

Treble

Boost/Cut

Treble Gain

Surround

0

Treble Gain

Surround

Mode

Surround Gain

Test Mode

0

1

0

1

System Reset

About the register that a function isn't assigned(above table, D0～D7 is "0" or "1"), set it up as the value of the above table.

Note:

Upon continuous data transfer, the Select Address is circulated by the automatic increment function, as shown below.

→

04→

06→

21

→

22

→

51→

57→

78

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Datasheet

BD3491FS

Select Address 04 (hex)

MSB

Input Selector

LSB

Mode

D7

D6

0

D5

0

D4

D3

D2

0

D1

0

D0

0

A

B

0

1

C

0

1

0

D

0

1

0

E

1

0

F

1

0

INPUT SHORT

INPUT MUTE

1

0

1

INPUT MUTE : Mute is done at the input signal in the part of Input Selector.

Select Address 06 (hex)

MSB

D7

Input Gain

LSB

D0

Gain

D6

D5

D4

0

1

0

1

D3

0

1

0

1

0

1

D2

0

1

0

1

0

1

0

1

0

1

0

1

D1

0

1

0

1

0

1

0

1

0

1

0dB

2dB

4dB

6dB

8dB

12dB

16dB

20dB

0

Prohibition

About Input Gain, the allotment of D4/D3/D2/D1 is discontinuous, please be careful.

: Initial condition

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Datasheet

BD3491FS

Select Address 21, 22 (hex)

MSB

D7

Volume Attenuation

D2

LSB

D0

Attenuation

D6

0

D5

D4

D3

D1

0

0dB

-1dB

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

-2dB

-3dB

-4dB

-5dB

-6dB

-7dB

-8dB

-9dB

-10dB

-11dB

-12dB

-13dB

-14dB

-15dB

-16dB

-17dB

-18dB

-19dB

-20dB

-21dB

-22dB

1

・

-83dB

-84dB

-85dB

-86dB

-87dB

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

・

Prohibition

1

0

1

-∞dB

: Initial condition

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Datasheet

BD3491FS

Select Address 51(hex)

MSB

Bass Gain

LSB

Gain

D7

D6

D5

D4

D3

0

D2

0

D1

0

D0

0dB

2dB

0

1

4dB

0

1

0

Bass

Boost

/Cut

6dB

0

1

0

8dB

1

0

10dB

12dB

14dB

1

0

1

0

1

MSB

Bass Boost/Cut

LSB

Mode

D7

0

D6

0

D5

D4

D3

D2

D1

D0

Boost

Cut

0

Bass Gain

0

1

Select Address 57(hex)

Gain

MSB

Treble Gain

LSB

D7

D6

D5

D4

D3

0

D2

0

D1

0

D0

0dB

2dB

0

1

4dB

0

1

0

Treble

Boost

/Cut

6dB

0

1

0

8dB

1

0

10dB

12dB

14dB

1

0

1

0

1

MSB

Treble Boost/Cut

LSB

Mode

D7

0

D6

0

D5

D4

D3

D2

D1

D0

Boost

Cut

0

Treble Gain

0

1

: Initial condition

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Datasheet

BD3491FS

Select Address 78(hex)

MSB

Surround Gain

LSB

Gain

D7

D6

D5

D4

D3

0

1

0

1

D2

0

1

0

1

0

1

0

1

D1

0

1

0

1

0

1

0

1

0

1

D0

0

1

0

1

0

1

0

1

0

1

0

1

0

OFF

Low

Middle

High

Surround

Mode

0

Prohibition

About Surround Gain, the allotment of D3/D2/D1/D0 is discontinuous, please be careful.

MSB

Surround Mode

LSB

Mode

D7

D6

0

D5

0

D4

0

D3

D2

D1

D0

Mode OFF

0

1

Surround SW

(A)=ON

Mode ON

Surround Gain

Surround SW

(B)=ON

About Surround SW, please refer to Figure 22,25,28,30,32,36 (From P22 to P27).

: Initial condition

(6) About initial condition at supply voltage on

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.

Limit

Item

Symbol

Unit

Condition

Min.

20

Typ.

Max.

Rise time of VCC

VCC rise time from 0V to 3V

Trise

Vpor

－

usec

V

VCC voltage of release

power on reset

－

3.0

－

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Datasheet

BD3491FS

Volume Attenuation

ATT(dB)

D7 D6 D5 D4 D3 D2 D1 D0

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

-46

-47

-48

-49

-50

-51

-52

-53

-54

-55

-56

-57

-58

-59

-60

-61

-62

-63

-64

-65

-66

-67

-68

-69

-70

-71

-72

-73

-74

-75

-76

-77

-78

-79

-80

-81

-82

-83

-84

-85

-86

-87

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

-1

-2

-3

-4

-5

-6

-7

-8

-9

-10

-11

-12

-13

-14

-15

-16

-17

-18

-19

-20

-21

-22

-23

-24

-25

-26

-27

-28

-29

-30

-31

-32

-33

-34

-35

-36

-37

-38

-39

-40

-41

-42

-43

-44

-45

Prohibition

・・・・・・・・

1

0

1

-∞

: Initial condition

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BD3491FS

Application Circuit Diagram

UNIT

RESISTANCE: Ω

CAPACITANCE: F

Figure 14. Application Circuit Diagram

Notes on Wiring

①Decoupling capacitor of the power supply has to be connected in the shortest distance possible.

②GND lines has to follow star-point connection.

③Wiring pattern of Digital signal should be away from that of analog unit. At the same time, crosstalk has to be minimized

, if not eliminated.

④If possible, SCL and SDA lines of I²C-BUS should not be parallel.

If it cannot be avoided, the lines must, at least, be shielded.

⑤Analog input lines should not be parallel, as well. If it cannot be avoided, the lines must, at least, be shielded.

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Thermal Derating Curve

The temperature, at which it is used, affects the electrical characteristics of an IC. 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.

Reference data

SSOP-A32

1.5

Measurement condition: ROHM Standard board

Board Size：70×70×1.6(㎣)

material：A FR4 grass epoxy board

0.95W

(3% or less of copper foil area)

1.0

θja = 131.6℃/W

0.5

0.0

85

0

25

50

75

100

125

150

Ambient Temperature Ta(℃)

Figure 15. Temperature Derating Curve

Note: Values are actual measurements and are not guaranteed.

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

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Pin Equivalent Circuit and Description

No.

Name

Voltage

Equivalent Circuit

Pin Description

Stereo signal input pin

32

31

1

A1

A2

4.5V

VCC

Input impedance = 50kΩ(typ)

B1

2

B2

3

C1

4

C2

50KΩ

5

D1

GND

6

D2

7

E1

8

E2

9

F1

10

11

12

21

25

F2

Output pin

VCC

SEL2

SEL1

OUT2

OUT1

4.5V

GND

VCC

Volume input pin

Input impedance = 50kΩ(typ)

13

14

VOL1

VOL2

4.5V

Total

50K

Ω

GND

VCC

TC1,TC2 : Treble filter pin

Refer to P21, Figure 20, Table 4 for the

input impedance.

15

16

17

20

TC2

TC1

4.5V

BCB2

BCB1

BCB1,BCB2 : Bass filter pin

Refer to P20, Figure 18, Table 3 for the

input impedance

GND

VCC

Bass filter pin

18

19

BCA2

BCA1

4.5V

GND

Power supply pin.

26

VCC

9.0V

The figure in the pin description, pin voltage and input/output equivalent circuit is reference value only. It does not guarantee the value.

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No.

name

voltage

Equivalent Circuit

Pin Description

Bass boost pin.

Refer to P22, Figure 22, Table 5 for the

input impedance.

VCC

22

24

SB2

SB1

4.5V

－

GND

VCC

Surround pin

Refer to P22, Figure 22, Table 5 for the

input impedance.

23

SR

GND

VCC

Clock input pin of

27

SCL

I²C-BUS communication.

1.65V

GND

VCC

Data input pin of

－

28

SDA

I²C-BUS communication.

1.65V

GND

Analog ground pin.

29

30

GND

FIL

0V

1/2 VCC pin.

VCC

4.5V

Reference voltage of analog signal

system.

The simple pre-charge circuit and simple

discharge circuit for an external capacitor

are built-in.

50KΩ

GND

The figure in the pin description, pin voltage and input/output equivalent circuit is reference value only. It does not guarantee the value.

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Cautions on use

1. Absolute Maximum Voltage Rating

When the voltage supplied to VCC is more than the absolute maximum voltage rating, circuit current increases

rapidly. This will lead to characteristic deterioration and destruction of the device. Especially in a surge test of the set,

when surge application is expected at VCC terminal (26pin), absolute maximum voltage rating must not be exceeded

(including a operating voltage + serge ingredient (around 14V)).

2. Input Signal

a) 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

R_IN(Ω) inside IC and please decide. The 1^storder HPF characteristic of RC is composed.

G[dB]

C[F]

0

RIN

A (f)

[Ω]

S^SH

F[Hz]

INPUT

(2πfCR IN )²

A(f) =

2

1+ (2πfCR IN)

Figure 16. Input Short Circuit

b) Input Selector SHORT

SHORT mode is the command which makes input impedance of all terminals in input selector small by setting

switch S_SHis ON. Switch S_SHis OFF, when SHORT command is disabled.

The charge time of an external coupling capacitor becomes short during the command.

It is recommended to use SHORT mode when there is no signal.

3. Output Load Characteristics

The usages of load for output are below (reference). Please use the load more than 10kΩ(TYP)

Pin No.

11

Pin Name

SEL2

Pin No.

21

Pin Name

OUT2

12

SEL1

25

OUT1

VCC=9.0V

THD+n=1%

BW=400to30kHz

Figure 17. Output Load Characteristic (Reference Vcc=9.0V)

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4. Sound Input Terminal

If this terminal is open, the input resistance is 50kΩ which may induce pop noise from the outside. If a sound input

terminal is not used, it has to be connected to GND using a capacitor or set up the input selector using a

microcomputer so that the unused input terminal will not be selected.

5. Bass Filter Constant Set Up

Bass Boost

Bass Cut

IN

OUT

R2

R3

R1

OUT

R2

R3

BCB1 (20in)

BCB2 (17pin)

BCA1 (19pin)

BCA2 (18pin)

BCB1 (20in)

BCB2 (17pin)

BCA1 (19pin)

BCA2 (18pin)

C1

C2

C1

C2

R1

Figure 18. Bass Filter

1

fo =

[Hz

]

2π R1(R2 +R3)･C1･C2

R1(R2 +R3)･C1･C2

R1(C1+C2) +R2C1

Q =

R2+R3 C2

+

R2 C2

+

R1 C1

R2+R3 C2

+

+1

R1

R2 C2

C1

BOOST GAIN = 20log

[dB

]

CUT GAIN = 20log

[dB

]

+

R1 C1

+1

R1

C1

Table 3.

Standard value of R2 and R3

Gain (dB)

Resistance(kΩ)

※TYP.

R2

Bass

Boost/Cut Gain

Boost

Cut

R3

0

fo

53.5

40.9

30.5

22.3

15.8

10.6

6.5

±0dB

±2dB

f(Hz)

12.6

23.0

31.2

37.7

42.9

47.0

50.3

±4dB

±6dB

±8dB

Figure 19. Bass Frequency Characteristics

±10dB

±12dB

±14dB

3.2

Actual boost/cut value may vary slightly .

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6. Treble Filter Constant Set Up

Treble Boost

Treble Cut

IN

OUT

R1

R2

R1

R2

OUT

TC1(16pin)

TC2(15pin)

TC1(16pin)

TC2(15pin)

C

Figure 20. Treble Filter

1

fc =

[Hz

]

2πR2･C

R1+ R2 + ZC

R2 + ZC

BOOST GAIN = 20log

[dB

]

CUT GAIN = 20log

[dB

]

R1+ R2 + ZC

1

ZC =

[Ω]

jωC

Table 4.

Standard value of R1 and R2(reference)

Gain(dB)

3dB

Resistance(kΩ)

Treble

※TYP.

Boost/Cut Gain

±0dB

R1

0

R2

29.1

23.0

18.2

14.3

11.2

8.6

Boost

ｆc

±2dB

6.1

f(Hz)

Cut

±4dB

±6dB

10.9

14.8

17.9

20.5

22.6

24.4

3dB

±8dB

Figure 21. Treble Frequency Characteristics

±10dB

±12dB

±14dB

6.5

4.7

Actual boost/cut value may vary slightly

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7. BassBoost Application

7-1. BassBoost Application Circuit

OUT1

OUT2

Table 5.

RB

Standard value of R1 and R2

Surround

R1[kΩ]

Gain

4.7µF

5.6k

C2

5.6k

C2

4.7µF

C1

R2[kΩ]

84.5

39.7

14.5

0.3

0.22µF 0.1µF

0.1µF 0.22µF

OFF

Low

0

24

23

22

21

25

44.8

70.0

84.2

1.4k

(A)

Middle

High

R1

R2

2.4k

34.1k

R2

R1

(B)

Surround SW : (A)=ON

Figure 22. Example of a BassBoost Application Circuit

7-2. The computation formula and the BassBoost Gain Characteristic Curve (fo=50Hz, Q=1.8(Surround Gain=High))

20

R¹+ R²C¹

+

High

+ 1

15

10

5

R^B

R2 C1

C²

Gain = 20log

[

dB

]

Middle

+

RB C2

+ 1

Low

1

OFF

fo =

[Hz

2π RB(R1 + R2) ⋅ C1⋅ C2

0

10

100

1k

Frequency [Hz]

10k

100k

RB(R1 + R2) ⋅ C1⋅ C2

RB(C1 + C2) + R2 ⋅ C2

Q =

Figure 23. BassBoost Gain Characteristic Curve

20

①

④

②

15

③

7-3. The Characteristic Curve in fixed number change

Table 6. The fixed number example ^(*1)

10

5

C1

[µF]

0.15

C2

[µF]

0.1

RB

[kΩ]

5.6

4.7

5.6

The specification

No.

fo=60Hz,Q=1.8,Gain=16.8dB

fo=72Hz,Q=1.7,Gain=15.0dB

fo=79Hz,Q=1.9,Gain=16.2dB

fo=89Hz,Q=1.8,Gain=16.9dB

①

②

③

④

0

0.15 0.068

10

100

Frequency [Hz]

1k

0.1

0.068

(*1): Surround Gain=High

Figure 24. BassBoost Gain Characteristic Curve in

fixed number change

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8. BassBoost & Surround Application

8-1. BassBoost & Surround Application Circuit

In this application circuit example, it isn't possible to do the use only of Surround. Also, Surround Gain depends on

the setting value of BassBoost Gain.

OUT1

OUT2

RB

3.3k

C2

RB

3.3k

C2

4.7µF

C1

CSUR

RS

C1

RS

0.22µ 0.1µ 12k

0.022µ

12k 0.1µ 0.22µ

Refer to Table 5 for R1 and R2

standard values.

25

24

23

22

21

1.4k

(A)

R1

R2

2.4k

34.1k

R2

R1

(B)

Surround SW : (B)=ON

Figure 25. Example of BassBoost & Surround Application Circuit

8-2. BassBoost & Surround Characteristic Curve and the computation formula of BassBoost Gain(Surround SW : (A)=ON)

15

R¹+ R^{2 +}R^SC¹

+

High

+ 1

R^B

C²

Gain = 20log

[

dB

]

R2 + RS C1

+

Middle

+ 1

10

5

RB

C2

Low

1

fo =

[

Hz

]

OFF

2π RB(R1 + R2 + RS) ⋅C1⋅ C2

0

10

100

1k

Frequency [Hz]

10k

100k

RB(R1 + R2 + RS) ⋅C1⋅ C2

RB(C1 + C2) + C2(R2 + RS)

Q =

Figure 26. BassBoost & Surround Characteristic Curve(Surround SW : (A)=ON)

8-3. BassBoost & Surround Characteristic Curve(Surround SW : (B)=ON)

In this application circuit example, it isn't possible to do the use only of Surround. Also, Surround Gain depends on

the setting value of BassBoost Gain.

15

High

Middle

10

Low

5

OFF

0

10

100

1k

10k

100k

Frequency [Hz]

Figure 27. BassBoost & Surround Characteristic Curve(Surround SW : (B)=ON)

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9.Easy Surround Application

9. Easy Surround Application Circuit

Refer to Table 5 for R1 and R2

standard values.

OUT1

OUT2

15

10

5

4.7µF

High

OPEN

22

Middle

25

24

23

21

1.4k

(A)

Low

OFF

R1

R2

2.4k

34.1k

R2

R1

(B)

0

Surround SW : (A)=ON

10

100

1k

Frequency [Hz]

10k

100k

Figure 28. Example of Easy Surround

Application Circuit

Figure 29. Easy Surround Characteristic Curve

10. Surround Application

10-1. Surround Application Circuit

OUT1

OUT2

C

SUR

0.0047µF

RSUR

22k

4.7µF

Refer to Table 5 for R1 and R2

standard values.

25

24

23

22

21

1.4k

(A)

R

1

R

2

2.4k

34.1k

R2

R1

(B)

Surround SW : (A)=ON

Figure 30. Example of Surround Application Circuit

10-2. Surround Characteristic Curve

15

10

5

High

Middle

Low

OFF

0

10

100

1k

10k

100k

Frequency [Hz]

Figure 31. Surround Characteristic Curve

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11. Output Gain Application

11-1. Output Gain Application Circuit

OUT1

OUT2

1µF

4.7µF

1µF

4.7µF

ROUT

18k

ROUT

18k

25

24

23

22

21

1.4k

(A)

R1

R2

2.4k

34.1k

R2

R1

Refer to Table 5 for R1 and R2

standard values.

(B)

Surround SW : (A)=ON

Figure 32. Example of Output Gain Application Circuit

11-2. The computation formula and the Output Gain Characteristic Curve

R1 + R2 + ROUT

Gain = 20log

[dB

]

R2 + ROUT

20

15

10

5

High

Middle

Low

OFF

0

10

100

1k

Frequency [Hz]

10k

100k

Figure 33. Output Gain Characteristic Curve

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12. Easy 3 Band Application

12-1. Easy 3 Band Application Circuit

・Easy 3 band is formed using BassBoost, Bass and Treble.

・Use BassBoost for Bass band, Bass for Middle band and Treble for Treble band.

・The Middle band and Treble band Gain ranges from -14dB to 14dB with 2dB step while Bass band have four

Gain settings (OFF/Low/Middle/High).

・At the addition function unused time, it is Surround Gain=OFF, Surround SW : Use in (A)=ON.

・Surround SW : Be careful because it damages output (25pin, 21pin) short-circuiting next, a characteristic

when having made (B)=ON.

Figure 34. Example of Easy 3 band Application Circuit

6-2. Easy 3 Band Characteristic Curve

15

10

5

0

-5

-10

-15

10

100

1k

10k

100k

Frequency [Hz]

Figure 35. Easy 3 Band Characteristic Curve

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13. Application Circuit example when added function is not used

・When the added function is unused, Surround Gain=OFF, Surround SW : (A)=ON.

・Surround SW : Caution must be taken when set to (B)=ON. In this condition, the outputs are shorted(25pin, 21pin)

and will degrade the electrical characteristics of the chip.

OUT1

OUT2

4.7µF

Refer to Table 5 for R1 and R2

standard values.

25

24

23

22

21

1.4k

(A)

R

1

R

2

2.4k

34.1k

R2

R1

(B)

Surround SW : (A)=ON

Figure 36. Example of addition function unused time Application Circuit

14. INPUT SHORT Function Application Circuit

・The INPUT SHORT function makes input impedance RIN small in the switch control and

causes fast charging in the external coupling capacitance.

・The input terminal DC bias voltage can be changed to its regular condition (1/2VCC) by

enabling this function (I²C-BUS setting : Select Address=04(hex),Data=05(hex)) immediately

after start-up.

・INPUT SHORT function has to be used whenever there is no input at the input terminals.

Input Selector

BIAS

50k

32

A1

1

3

5

B1

C1

D1

Figure 37. INPUT SHORT mode in Ch1

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15. Microphone Input Application

・Outside sound signal can be added to VOL1(13pin) and VOL2(14pin) since its input impedance is constant (50kΩ).

Even if the volume attenuation setting changes, it can still be used as the microphone input terminal.

・Due to the added resistor at VOL1 and VOL2 terminal, the signal level of this terminals (VOL1, VOL2) is

determined by its resistance value and acts as signal level VOLUME.

VOLUME

Zin

SEL2

11

SEL1

12

VOL1

13

VOL2

14

*Zin=50kΩ(typ) constant

*Make R2 larger than the output-impedance of

the outside sound signal.

R1

2.2µ

* However as R1 and R2 increases, output

noise voltage becomes worst.

2.2µ

R2

2.2µ

External Input

Figure 38. Example of microphone input Application Circuit

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Ordering Information

F S

B D 3 4 9 1

E 2

Package

FS: SSOP-A32

Part Number

Packaging and forming specification

E2: Embossed tape and reel

(SSOP-A32)

Physical Dimension: Tape and Reel Information

SSOP-A32

13.6 0.2

Tape

Embossed carrier tape

(MAX 13.95 include BURR)

Quantity

2000pcs

32

17

E2

Direction

of feed

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

(

)

1

16

0.15 0.1

0.36 0.1

0.1

0.8

Direction of feed

1pin

Reel

(Unit : mm)

Order quantity needs to be multiple of the minimum quantity.

Marking Diagram(TOP VIEW)

SSOP-A32(TOP VIEW)

Part Number Marking

LOT Number

BD3491FS

1PIN MARK

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Revision history

Date

Revision

001

Changes

08.FEB.2013

New Release

Date

Revision

002

5.Dec.2013

All page, format update

Minor correction

002

Date

Revision

003

Changes

28.FEB.2014

Correct figure, Application Circuit Diagram, Pin Configuration , Block Diagram.

Correct CONTROL SIGNAL SPECIFICATION, Slave address, initial condition.

Correct Thermal resistance and Power Dissipation.

003

Minor correction

Date

Revision

004

Changes

Comment about Prohibition in I²C-data add.

Minor correction

1.APR.2014

004

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Daattaasshheeeett

Notice

Precaution on using ROHM Products

1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,

OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you

intend to use our Products in devices requiring extremely high reliability (such as medical equipment ^{(Note 1)}, transport

equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car

accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or

serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.

Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any

damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific

Applications.

(Note1) Medical Equipment Classification of the Specific Applications

JAPAN

USA

EU

CHINA

CLASSⅢ

CLASSⅣ

CLASSⅡb

CLASSⅢ

2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor

products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate

safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which

a failure or malfunction of our Products may cause. The following are examples of safety measures:

[a] Installation of protection circuits or other protective devices to improve system safety

[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3. Our Products are designed and manufactured for use under standard conditions and not under any special or

extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way

responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any

special or extraordinary environments or conditions. If you intend to use our Products under any special or

extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of

product performance, reliability, etc, prior to use, must be necessary:

[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents

[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust

[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,

H2S, NH3, SO2, and NO2

[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves

[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items

[f] Sealing or coating our Products with resin or other coating materials

[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of

flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning

residue after soldering

[h] Use of the Products in places subject to dew condensation

4. The Products are not subject to radiation-proof design.

5. Please verify and confirm characteristics of the final or mounted products in using the Products.

6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,

confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power

exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect

product performance and reliability.

7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual

ambient temperature.

8. Confirm that operation temperature is within the specified range described in the product specification.

9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in

this document.

Precaution for Mounting / Circuit board design

1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the

ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Notice – GE

Rev.002

Daattaasshheeeett

Precautions Regarding Application Examples and External Circuits

1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the

characteristics of the Products and external components, including transient characteristics, as well as static

characteristics.

2. You agree that application notes, reference designs, and associated data and information contained in this document

are presented only as guidance for Products use. Therefore, in case you use such information, you are solely

responsible for it and you must exercise your own independent verification and judgment in the use of such information

contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses

incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic

This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper

caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be

applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,

isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation

1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:

[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2

[b] the temperature or humidity exceeds those recommended by ROHM

[c] the Products are exposed to direct sunshine or condensation

[d] the Products are exposed to high Electrostatic

2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period

may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is

exceeding the recommended storage time period.

3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads

may occur due to excessive stress applied when dropping of a carton.

4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of

which storage time is exceeding the recommended storage time period.

Precaution for Product Label

QR code printed on ROHM Products label is for ROHM’s internal use only.

Precaution for Disposition

When disposing Products please dispose them properly using an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade act

Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,

please consult with ROHM representative in case of export.

Precaution Regarding Intellectual Property Rights

1. All information and data including but not limited to application example contained in this document is for reference

only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any

other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable

for infringement of any intellectual property rights or other damages arising from use of such information or data.:

2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any

third parties with respect to the information contained in this document.

Other Precaution

1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written

consent of ROHM.

3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the

Products or this document for any military purposes, including but not limited to, the development of mass-destruction

weapons.

4. The proper names of companies or products described in this document are trademarks or registered trademarks of

ROHM, its affiliated companies or third parties.

Notice – GE

Rev.002

Daattaasshheeeett

General Precaution

1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.

ROHM shall not be in an y way responsible or liable for failure, malfunction or accident arising from the use of a ny

ROHM’s Products against warning, caution or note contained in this document.

2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior

notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s

representative.

3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all

information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or

liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or

concerning such information.

Notice – WE

Rev.001

Datasheet

Buy

BD3491FS - Web Page

Distribution Inventory

Part Number

Package

Unit Quantity

BD3491FS

SSOP-A32

2000

Minimum Package Quantity

Packing Type

Constitution Materials List

RoHS

2000

Taping

inquiry

Yes


型号：	BD3491FS-E2
厂家：	ROHM
描述：	Sound Processor with Built-in Surround Sound Function
文件：	总34页 (文件大小：1235K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BD3491FS-E2 [ROHM]

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