G3NA-450B-UTU-2 DC5-24 BY OMZ - OMRON

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www.rohm.com 2010.06 - Rev.A

Sound Processors for Home Theater Systems

6ch / 9ch Stereo

Input Selectors

BD3843FS,BD3841FS

●Description

BD3843FS is a function switch IC with two 6ch (9ch for BD3841FS) inputs. It can independently control outputs of 2 systems:

2ch REC output (3ch for BD3841FS) and 1ch line out put. Therefore, it is can be used for 2nd room entertainment and 2nd

source recording. BD3843FS has excellent cross-talk characteristics between channels and selectors. Low distortion, and

low noise are realized by a basic pattern layout.

●Features

1) 2 room entertainment / 2 source recording.

2) 6ch volume LSI BD3813KS/BD3815KS can be controlled simultaneously by the ser ial control bus.

3) 7ch volume LSI BD3816K1, BD3817KS with BD3843FS can be controlled simultaneousl y by the serial control bus.

4) 14ch input is available by combining 2chips (BD3843FS and BD3841FS).

5) Excellent cross-talk characteristics between channels by basic pattern layout.

6) Built-in buffer amplifier.

7) 2-line serial control bus (for both 3.3V and 5 V).

8) Operated by single and dual power sources.

●Applications

AV receivers, home theater systems, mini-audio systems, and TVs.

●Product lineup

Parameter BD3843FS BD3841FS

Input selector 6 9

REC output 2 3

Package SSOP-A24 SSOP-A32

●Absolute maximum ratings (Ta=25℃)

Parameter Symbol Ratings Unit

Power Supply Voltage VCC 7.5 *1 V

VEE -7.5

Input signal voltage VIN VCC+0.3～VEE-0.3 V

Power Dissipation Pd 800 (BD3843FS)

950 (BD3841FS) *2 mW

Operating temperature Topr －20～+75 ℃

Storage temperature Tastg －55～+125 ℃

*1 Even in the specified range of Power Supply Voltage, applying voltage only to the VCC side may cause

an excessive current may cause permanent damage to the IC.

When starting up power supplies, VEE and VCC should be powered on simultaneously, or VEE first followed by VCC.

*2 Reduced by 8 mW/℃ over 25℃ (BD3843FS), when installed on the standard board (size: 70 x 70 x 1.6mm).

Reduced by 7.7 mW/℃ over 25℃ (BD3841FS), when installed on the standard board (size: 70 x 70 x 1.6mm).

No.10081EAT07

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www.rohm.com 2010.06 - Rev.A

Technical Note

BD3843FS,BD3841FS

●Operating range

Must function normally at Ta = 25℃,

Part No. Parameter Symbol Ratings Unit

Min. Typ. Max.

BD3843FS

Action power source voltage

(both power sources) VCC 4 7 7.3

VEE -7.3 -7 -4

Action power source voltage

(single power source) VCC- VEE 8 14 14.6

BD3841FS

Action power source voltage

(both power sources) VCC 5 7 7.3

VEE -7.3 -7 -5

Action power source voltage

(single power source) VCC- VEE 10 14 14.6

●Electrical characteristics

Ta=25℃, VCC=7V, VEE=7V, f=1kHz, Vin=1Vrms, RL=10kΩ, Rg=600Ω, unless otherwise noted.

Parameter Symbol Limits Unit Conditions

Min. Typ. Max.

Circuit current VCC IQ ― 3 10

mA No signal

VEE -10 -3 ―

Output

Output voltage gain 1ch Gv1 -2 0 2 dB

Output voltage gain 2ch Gv2 -2 0 2 dB

Total harmonic distortion ratio 1ch THD1 ― 0.004 0.05 % BW=400～30kHz

Total harmonic distortion ratio 2ch THD2 ― 0.004 0.05 % BW=400～30kHz

Maximum output voltage 1ch Vomax1 3.4 4.2 ― Vrms THD=1%

Maximum output voltage 2ch Vomax2 3.4 4.2 ― Vrms THD=1%

Output noise voltage 1ch Vno1 ― 1 5 µVrms Rg=0Ω, BW=IHF-A

Output noise voltage 2ch Vno2 ― 1 5 µVrms Rg=0Ω, BW=IHF-A

Cross-talk between channels

1ch→2ch CTC12 ― -95 -80 dB Rg=0Ω, BW=IHF-A

Cross-talk between channels

2ch→1ch CTC21 ― -95 -80 dB Rg=0Ω, BW=IHF-A

Cross-talk between selectors 1ch CTS1 ― -95 -80 dB Rg=0Ω, BW=IHF-A

Cross-talk between selectors 2ch CTS2 ― -95 -80 dB Rg=0Ω, BW=IHF-A

REC output

R voltage gain 1ch GVR1 -2 0 2 dB RL=47kΩ,

R voltage gain 2ch GVR2 -2 0 2 dB RL=47kΩ,

R Total harmonic distortion ratio 1ch THDR1 ― 0.01 0.09 %

RL=47kΩ,

BW=400～30kHz

R Total harmonic distortion ratio 2ch THDR2 ― 0.01 0.09 %

RL=47kΩ,

BW=400～30kHz

R output noise voltage 1ch VnoR1 ― 1 5 µVms Rg=0Ω, BW=IHF-A

R output noise voltage 2ch VnoR2 ― 1 5 µVms Rg=0Ω, BW=IHF-A

R output impedance 1ch RoutR1 ― 50 100 Ω

R output impedance 2ch RoutR2 ― 50 100 Ω

* Note: This IC is not designed to be radiation-resistant.

3/9

www.rohm.com 2010.06 - Rev.A

Technical Note

BD3843FS,BD3841FS

●Timing chart

1. Signal timing standards

・Data is read at the rise of clock.

・Latch is read at the fall of clock.

・End latch signal at LOW.

* To avoid malfunctions, clock and data signals must terminate with the LOW state.

1byte=17bit

Fig.1

Parameter Symbol Limit Unit

Min. Typ. Max.

Minimum clock width twc 2.0 －－ µs

Minimum data width twd 2.0 －－ µs

Minimum latch width twl 2.0 －－ µs

LOW hold width twh 2.0 －－ µs

Data setup time (DATA→CLK) tsd 1.0 －－ µs

Data hold time (CLK→DATA) thd 1.0 －－ µs

Latch setup time (CLK→LATCH) tsl 1.0 －－ µs

Latch hold time (DATA→LATCH) thl 1.0 －－ µs

Latch low setup time ts 1.0 －－ µs

Latch low hold time th 1.0 －－ µs

2. Voltage standards of control signa l

Parameter Conditions Limits Unit

Min. Typ. Max.(≦Vcc)

“H” input voltage Vcc=5～7.3V

VEE=-5～-7.3V

2.2 － 5.5 V

“L” input voltage 0 － 1.0 V

（CLOCK）

DATA

LATCH

thd thdth ts tsl thl tsd

twc

twh

twd twl

tsu

DATA DATA LATCH

90％ 90％ 90％ 90％

10％ 10％ 10％

90％ 90％ 90％ 90％ 90％

10％ 10％ 10％

twc

Finish at Low

4/9

www.rohm.com 2010.06 - Rev.A

Technical Note

BD3843FS,BD3841FS

3. Control data format list

(1) BD3843FS control data format

Data input direction

MSB LSB

Data

D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

INPUT FUNCTION 1 INPUT FUNCTION 2 RECA

0:OFF

1:ON

RECB

0:OFF

1:ON * 0 0 0 Select Address

(2) BD3841FS control data format

Data input direction

MSB

LSB

Data

D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

INPUT FUNCTION 1 INPUT FUNCTION 2 RECA

0:OFF

1:ON

RECB

0:OFF

1:ON

RECC

0:OFF

1:ON * * * 1 0 1

*:Don’t care.

(Ex.) Data input dir ection

MSB LSB

Data L

"L" represents latch.

5/9

www.rohm.com 2010.06 - Rev.A

Technical Note

BD3843FS,BD3841FS

●Block diagram, application circuit

1)BD3843FS)

(both power sources)

Fig.2

2)BD3841FS

(both power sources)

Fig.3 UNIT

RESISTANCE：Ω

CAPACITOR：F

* F-SW1：INPUT FUNCTION1

F-SW2：INPUT FUNCTION2

30 29 31 32 24 2325262728 18 17 19202122

15 16 141312111098765 4 3 2 1

LOGIC

10KΩ

47μ

47K

VEE

Vcc

RE CA 1

RE CA2

RECB1

RE CB 2

RECC1

RE CC2

OUT1

OUT2

INI1

INI2

INA1

INA2

INB1

INB2

INC1

INC2

IND1

IND2

INE1

INE2

INF1

INF2

ING1

ING2

INH1

INH2

47K

F-SW1

F-SW 2

VEE

DGND

VCC

RECA1

RECA2

RECB1

RECB2

OUT1

OUT2

GND

INA1

INA2

INB1

INB2

INC1

INC2

IND1

IND2

INE1

INE2

INF1

INF2

222324 16 1517181920 131421

1211109

432

LOGIC

F-SW1

F-SW2 10K

10K

47μ

47K

6/9

www.rohm.com 2010.06 - Rev.A

Technical Note

BD3843FS,BD3841FS

3)BD3843FS

(single power source)

Fig.4

4)BD3841FS

(single power source)

Fig.5

* F-SW1：INPUT FUNCTION1

F-SW2：INPUT FUNCTION2

DGND

1/2VCC

RECA1

RECA2

RECB1

RECB2

OUT1

OUT2

GND

INA1

INA2

INB1

INB2

INC1

INC2

IND1

IND2

INE1

INE2

INF1

INF2

222324 16 1517181920 131421

1211109

432

LOGIC

F-SW1

F-SW2 10K

10K

47K 10μ

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

47K

10μ

VCC

47μ

30 29 3132 24 2325262728 18 17 19202122

15 16 141312111098765 4 3 2 1

10KΩ

LOGIC

10KΩ

47μ

47K

1/2Vcc

Vcc

RECA1

RECA

RECB1

RECB2

RECC1

RECC2

OUT1

OUT2

INI1

INI2

INA1

INA2

INB1

INB2

INC1

INC2

IND1

IND2

INE1

INE2

INF1

INF2

ING1

ING2

INH1

INH2

47K

10μ

47K

10μ

F-SW 1

F-SW2

UNIT

RESISTANCE：Ω

CAPACITOR：F

RESISTANCE：Ω

7/9

www.rohm.com 2010.06 - Rev.A

Technical Note

BD3843FS,BD3841FS

-5

-4

-3

-2

-1

0246810

VC C , VEE (V)

CIRCUIT CURRENT (mA)

0.001

0.01

0.1

0.001 0.01 0.1 1 10

INPUT VO LTAGE ( Vr ms)

OUTPUT VOLTAGE (Vr m s )

0.0001

0.001

0.01

0.1

0.001 0.01 0.1 1 10

INPUT VOLTAGE (Vrms)

THD+N （%）

-2

-1

10 100 1000 10000 100000

FREQUENCY(Hz)

GAIN(dB)

0.0

1.0

2.0

3.0

4.0

5.0

0246810

VCC,VEE (V)

NOISE (μVrms)

0.001

0.01

0.1

0.001 0.01 0.1 1 10

INPUT VOLTAGE ( Vr m s)

OUTPUT VOLTAGE (Vrms)

0.0001

0.001

0.01

0.1

0.001 0.01 0.1 1 10

INPUT VOLTAGE (Vrms)

THD+N (%)

-2

-1

10 100 1000 10000 100000

FREQ UENC Y (Hz)

GAIN (dB)

0.0

1.0

2.0

3.0

4.0

5.0

0246810

VCC,VEE(V)

NOISE(μVrms)

●Reference data

Fig.6 Circuit Current - Supply

Voltage Fig.7 Output Voltage - Input

Voltage Fig.8 Total Harmonic

Distortion - Input Voltage

Fig.9 Voltage Gain -

Frequency Fig.10 Output Noise Voltage –

Supply Voltage Fig.11 REC Output Voltage -

Input Voltage

Fig.12 REC Total Harmonic Distortion

- Input Voltage Fig.13 REC Voltage Gain -

Frequency Fig.14 REC Output Noise -

Supply Voltage

VCC

VEE

8/9

www.rohm.com 2010.06 - Rev.A

Technical Note

BD3843FS,BD3841FS

●Notes for use

1. Numbers and data in entries are representative design values and ar e not guaranteed values of the items.

2. Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to

verify circuit characteristics for your particular application. Modification of constants for other externally connected circ uits

may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow for

sufficient margins when determining circuit constants.

3. Absolute maximum ratings

Use of the IC in excess of absolute maximum ratings, such as the applied voltage or ope rating temperat ure range (Topr),

may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when

such damage is suffered. A physical safety measure, such as a fuse, should be implem ented when using the IC at times

where the absolute maximum ratings may be exceeded.

4. VEE potential

Make the VEE pin voltage such that it is the lowest voltage even when operating below it. Actually confirm that the

voltage of each pin does not become a lower voltage than the VEE pin, including transient phenomena.

5. Thermal design

Perform thermal design, in which th ere are adequate marg ins, by taking into account the power dissipation (Pd) in ac tual

states of use.

6. Short circuit between terminals and errone ous mounting

Pay attention to the assembly direction of the ICs. Wrong mounting direct ion or shorts between terminals, GND, or other

components on the circuits, can damage the IC.

7. Operation in strong electromagnetic field

Using the ICs in a strong electromagnetic field can cause operation malfunction.

8. Operating Voltage Range and Operating Temperature Range

Circuit function actions are guaranteed within the action voltage range and the action temperature range. However, the

specific values of the electrical characteristics are guaranteed under the specified conditions of the electrical

characteristics. Therefore, carry out set considerations in sufficient consideration of IC characteristic fluctuations..

9. Power ON/OFF

(a) At power ON/OFF, a shock sound will be generated. Therefore, use MUTE on the set.

(b) When turning on power supplies, VEE and V CC should be powered on simultaneously, or VEE first followed by

VCC. If the VCC side is started up first, an excessive current may flow from VCC to VEE.

10. Serial control

For the CL and DA terminals, the patterned and other wirings should be routed as not to cause interference with the

analog-signal-related lines.

1 1. Function switching

For all functions, other than Master Volume, Treble, and Bass Gain Settings, use MUTE on the set.

9/9

www.rohm.com 2010.06 - Rev.

Technical Note

BD3843FS,BD3841FS

●Ordering part number

B D 3 8 4 3 F S - E 2

Part No. Part No.

3843

3841

Package

FS: SSOP-A24

SSOP-A32

Packaging and forming specification

None: Tray

∗

Order quantity needs to be multiple of the minimum quantity.

Embossed carrier tapeTape

Quantity

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

2000pcs

()

Direction of feed

Reel 1pin

(Unit : mm)

SSOP-A24

0.1±0.1

0.8

−4°

+6°

0.17−0.05

+0.1

1.8±0.1

4°

0.38±0.1

10±0.2

0.5±0.2

1.2±0.15

7.8±0.3

5.4±0.2

(MAX 10.35 include BURR)

0.1

∗

Order quantity needs to be multiple of the minimum quantity.

Embossed carrier tapeTape

Quantity

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

2000pcs

()

Direction of feed

Reel 1pin

(Unit : mm)

SSOP-A32

0.11

0.3MIN

0.36±0.1

0.8

13.6±0.2

0.15±0.1

5.4±0.2

7.8±0.3

1.8±0.1

(MAX 13.95 include BURR)

0.1

Datasheet

Notice - GE Rev.002

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 CLASSⅢ CLASSⅡb CLASSⅢ

CLASSⅣ 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

Datasheet

Notice - GE Rev.002

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.

DatasheetDatasheet

Notice – WE Rev.001

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 n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent 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 inaccur acy or errors of or

concerning such information.

Datasheet

Part Number bd3841fs

Package SSOP-A32

Unit Quantity 2000

Minimum Package Quantity 2000

Packing Type Taping

Constitution Materials List inquiry

RoHS Yes

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