ROHM BD3825FS Technical data

Video/Audio Interfaces for TV and DVD Recorders

PAL Audio
I/O Interface

BD3825FS

٨Description

TECHNICAL NOTE

BD3825FS is an audio signal switch IC used for PAL DVD-Recorders. BD3825FS supports six input lines which are
controlled by the I

٨Features

1) Vcc = ±5V (for Audio signal), +12V (for Function SW)
Audio SW (C-MOS analog switch configuration)

2) 3 inputs - 1output SW, (2 circuits built-in with MUTE function)

3) 2 inputs - 1output SW, (2 circuits built-in with MUTE function)

4) THD (typ.) = 0.007%

5) S/N (typ.) = 90dB

6) Crosstalk (typ.) = 90dB

7) ON resistance (max.) = 300ȍ

8) 2 Function Switch outputs

٨Applications

DVD-Recorder, STB, etc.

٨Absolute maximum ratings㧔Ta=25°C㧕

2

C-BUS of video signal LSI BH7624KS2. In addition, BD3825FS has two built-in Function Switch features.

Parameter Symbol Limits Unit

Power Supply Voltage1 V1 r6.0 V

V

Power Supply Voltage2
Power Dissipation Pd 800 *1 mW
Operating Temperature Range Topr -25 㨪 +75 °C
Storage Temperature Range Tstg -55 㨪 +125 °C

*1 Reduced by 9 mW/qC over 25qC.

㧗13.5 V

2

٨Operating range (Ta=25°C)

Parameter Symbol Limits Unit
Supply voltage1 Vcc1 r4.5㨪r5.5 V
Supply voltage2 Vcc2 11.5㨪12.5 V

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

Ver.B Oct.2005

٨Electrical characteristics (Unless otherwise specified, Vcc1=±5.0V, Vcc2=12V, Ta=25°C)

Item Symbol

㧨whole㧪

Circuit Current 1

Circuit Current 2

㧨AUX, L1_R,L OUT㧪

Frequency Characteristic

Distortion

S/N

ON Resistance

Limit

Unit Conditions

MIN. TYP. MAX.

2.5 5.0 7.5 mA Vcc1=±5V

I

ATYP1

5.0 10.0 15.0 mA Vcc2=12V

I

ATYP2

-1.0 0.0 1.0 dB

F

FC

F

DIS

80 90 - dB

F

SN

- 200 300 ȍ Vin=0V

R

ON

- 0.007 0.1 %

Vin=2Vrms, f=20Hz/100kHz

=47kȍ

R

L

Vin=2.2Vrms, f=1kHz

=47kȍ

R

L

Vin=2Vrms, f=1kHz

No Filter

MUTE Attenuation

ASW1 SW Crosstalk

ASW2 SW Crosstalk

Between crosstalk channel
(AUX_L chЊR ch)

Between crosstalk channel
(L1_L chЊR ch)

FS_AUX,FS_L1 output voltage H

FS_AUX,FS_L1 output voltage M

FS_AUX,FS_L1 output voltage L

ASW1,2,3,4 input voltage H

- -80 -75 dB

F

MUTE

F

F

F

F

- -90 -85 dB Vin=2Vrms, f=1kHz

SWCRS1

- -90 -85 dB Vin=2Vrms, f=1kHz

SWCRS2

- -90 -85 dB Vin=2Vrms, f=1kHz

CHCRS1

- -90 -85 dB Vin=2Vrms, f=1kHz

CHCRS2

10.0 11.0 12.0 V RL=10kȍ

V

FSOH

5 5.75 6.5 V RL =10kȍ

V

FSOM

0 0 1.5 V RL =10kȍ

V

FSOL

2.0 - +Vcc1 V

V

ASWH

Vin=2Vrms, f=1kHz

R

=47kȍ

L

ASW1,2,3,4 input voltage L

FS_AUX, FS_L1 input voltage H

FS_AUX, FS_L1 input voltage M

FS_AUX, FS_L1 input voltage L

0 - 1.0 V

V

ASWL

3.9 - +Vcc1 V

V

FSIH

1.65 - 3.1 V

V

FSIM

0 - 0.85 V

V

FSIL

2/8

٨Block diagram

67A.A+0



&#A.A+0



.A.A+0



67A4A+0



&#A4A+0



.A4A+0



#7:A.A+0



#7:A4A+0



(5A.A176



(5A.A+0



 UVCVGU

FS_L1 OUT





#59

#59

#59

TU_Lch
DA_Lch
L1_Lch

#59

1
2
3

SW1

#7:A.A176



MUTE 4
TU_Rch

1
DA_Rch
L1_Rch

2

3

#7:A4A176



MUTE 4

TU/DA/L1

DA_Lch

AUX_Lch

1
2

SW2

.A.A176



MUTE 3
DA_Rch

AUX_Rch

MUTE 3

12V

H
M
L

1
2

6.7V

Fig.1 Block Diagram

DA/AUX

FS_AUX OUT

(5A#7:A176

(5A#7:A+0

 UVCVGU

    

12V

H
M
L

-5V +5V +12V

6.7V



.A4A176



3/8

٨Equivalent circuit

PIN
NO.

1
7

Pin name IN OUT

ASW1
ASW4

٤ 㧙

Referance

Voltage

Threshold

1.0㨪2.0V

Equivalent Circuit Function

SW control signal

200K

30K

input terminal
At Input open, input

becomes “H” due to the
pull up resistance. Input
impedance is 200kȍ

2
6

3

11

13

4
5
8

9
15
17
21
23

10
12

ASW2
ASW3

+5V

-5V

+12V

TU_R_IN

TU_L_IN

DA_R_IN

DA_L_IN

AUX_R_IN

AUX_L_IN

L1_R_IN

L1_L_IN

FS_L1_IN

FS_AUX_IN

٤ 㧙

Threshold

1.0㨪2.0V

5V

㧙 㧙

-5V

12V

٤ 㧙 㧙

Threshold

0.85㨪

٤ 㧙

1.65V

3.1㨪

3.9V

SW control signal input
terminal

200K

At input open, input
becomes “L” due to the
pull down resistance. Input
Impedance is 200kȍ.

Power supply terminal

50

Audio signal input terminal
The audio signal input

terminal is connected to
the analog switch inside.

FS control signal input
terminal

It has two threshold
voltages. At input open, it
becomes “L” input due to
the pull down resistance.
Input impedance is 200kȍ

14
16
20
22

18
24

AUX_R_OUT

AUX_L_OUT

FS_AUX_OUT

FS_L1_OUT

L1_R_OUT

L1_L_OUT

㧙 ٤ 㧙

㧙 ٤

19 GND 㧙 㧙 0V

H:11.0V
M:5.75V
L:0V

4/8

12V

Audio signal output

50

terminal
A chosen audio signal can

be outputted using the
input transfer switch.

FS output terminal
FS output circuit has 3

6.7V

output states H, M & L.
Load resistance above
10kȍ is used.
Output becomes HiZ at “L”
selection.

GND terminal

٨Description of operations

Ԙ SW1, SW2

Audio input is controlled by I

ԙ FS_L1_OUT, FS_AUX_OUT

The 3 states signal (HI, MID, LOW) of the 5V standard is input into FS_L1_IN (10pin), FS_AUX_IN (12pin).
Then FS_L1_OUT (24pin), FS_AUX_OUT (18pin) output standard signal of the 12V.
This output becomes a Function Switch of the scart connector.

٨SW Control truth table

SW1

ASW1 ASW2 AUX_L_OUT AUX_R_OUT

L L TU_L_IN TU_R_IN

L H DA_L_IN DA_R_IN

H L L1_L_IN L1_R_IN

2

C-BUS of BH7624KS2.

H H MUTE MUTE

SW2

ASW3 ASW4 L1_L_OUT L1_R_OUT

L L DA_L_IN DA_R_IN

L H AUX_L_IN AUX_R_IN

H L MUTE MUTE

H H MUTE MUTE

At power Activation

ASW1 : H
ASW2 : L
ASW3 : L
ASW4 : H

5/8

٨Application circuit

(

)

(

)

(Supply

)

+5V

ASW1

23

ASW2

21

ASW3

17

ASW4

15

FSL1

5

FSAUX

BH7624KS2

3

٨Reference data

4.5

4.4

[mA]

CC1

4.3

4.2

4.1

CIRCUIT CURRENT : I

4

3.9

-50 0 50 100

Fig3. Circuit Current1

TEMPERATURE [㷄]

10

0

GAIN

-10

-20

PHASE

GAIN [dB]

-30

-40

100C

100C

-50C

25C

-50C

25C

-50

1.00E+021.00E+031.00E+041.00E+051.00E+061.00E+071.00E+

Fig6. Frequency characteristic

Temperature dependence

FREQUENCY[Hz]

FS_L1_OUT

24

L1_L_IN

23

L1_L_OUT

22

L1_R_IN

21

L1_R_OUT

20

GND

19

FS_AUX_OUT

18

AUX_L_IN

17

AUX_L_OUT

16

AUX_R_IN

15

AUX_R_OUT

14

13

+5V

-5V

TU_R_IN

TU_L_IN

DA_R_IN

DA_L_IN

0.1u

ASW1

1

ASW2

2

+5V

3

47u0.1u

TU_R_IN

4

TU_L_IN

5

ASW3

6

ASW4

7

DA_R_IN

8

DA_L_IN

9

FS_L1_IN

10

-5V

11

47u

FS_AUX_IN +12V

12

FS_L1 OUT

FS_AUX OUT

12V

H

6.7V

M
L

12V

H

6.7V

M
L

Fig.2

ASW1, 2, 3, 4, FS_L1_IN, FS_AUX_IN are controlled by I

12

10

[mA]

CC2

8

6

4

CIRCUIT CURRENT:I

2

0

-50 0 50 100

TEMPERATURE [㷄]

Fig4. Circuit Current2

㪈㪌㪇

㪈㪇㪇

㪌㪇

㪇

㪄㪌㪇

㪄㪈㪇㪇

㪄㪈㪌㪇

08

㪲㩼㪴

㪛㪠㪪

PHASE [deg]

㪛㪠㪪㪫㪦㪩㪫㪠㪦㪥㩷㪑㩷㪝

0.1

0.01

0.001

4.4 4.6 4.8 5 5.2 5.4 5.6

㪪㪬㪧㪧㪣㪰㩷㪭㪦㪣㪫㪘㪞㪜㩷㪑㪭㪚㪚㪈㩷㪲㪭㪴

Fig7. Distortion

voltagedependence

6/8

FS_L1_OUT

10k

L1_L_IN

L1_L_OUT

47k

L1_R_IN

L1_R_OUT

47k

GND

FS_AUX_OUT

10k

AUX_L_IN

AUX_L_OUT

47k

AUX_R_IN

AUX_R_OUT

47k

+12V

47u0.1u

2

C-BUS of BH7624KS2.

10

GAIN

0

5.6V

-10

PHASE

-20

GAIN [dB]

-30

-40

-50

1.00E+021.00E+031.00E+041.00E+051.00E+061.00E+071.00E+

5.0V

4.4V

5.6V

5.0V

4.4V

FREQUENCY[Hz]

Fig5. Frequency characteristics

Supply voltage dependence

0.1

㪲㩼㪴

㪛㪠㪪

㪛㪠㪪㪫㪦㪩㪫㪠㪦㪥㩷㪑㩷㪝

㪣

0.01

㪩

0.001

-50 0 50 100

㪫㪜㪤㪧㪜㪩㪘㪫㪬㪩㪜㪲㷄㪴

Fig8. Distortion

(Temperature dependence)

㪈㪌㪇

㪈㪇㪇

㪌㪇

㪇

PHASE [deg]

㪄㪌㪇

㪄㪈㪇㪇

㪄㪈㪌㪇

08

100

(

)

100

250

㪪㪆㪥㩷㪑㩷㪝㪪㪥㪲㩼㪴

98

96

94

92

98

96

94

㪪㪆㪥㩷㪑㩷㪝㪪㪥㪲㩼㪴

92

㪲㱅㪴

㪦㪥

㪩㪦㪥㩷㪑㩷㪩

200

150

90

4.4 4.6 4.8 5 5.2 5.4 5.6

-80

㪪㪬㪧㪧㪣㪰㩷㪭㪦㪣㪫㪘㪞㪜㩷㪑㪭㪚㪚㪈㩷㪲㪭㪴

Fig9. S/N ratio

(Supply voltage Dependence)

-85

-90

90

-50 0 50 100

㪫㪜㪤㪧㪜㪩㪘㪫㪬㪩㪜㪲㷄㪴

Fig10. S/N ratio

Temperature dependence

-80

㪲㪻㪙㪴

-85

㪪㪮㪚㪩㪪㪉

㪃㪝

㪪㪮㪚㪩㪪㪈

-90

100

-50 0 50 100

㪫㪜㪤㪧㪜㪩㪘㪫㪬㪩㪜㩷㪲㷄㪴

Fig11. ON Resistance

-80

㪲㪻㪙㪴

㪚㪟㪚㪩㪪㪉

-85

㪈㪃㪝

㪚㪟㪚㪩㪪

-90

-95

㪘㪪㪮㩷㪚㪩㪦㪪㪪㪫㪘㪣㪢㩷㪑㩷㪝㪪㪮㪚㪩㪪㪈㪃㪝㪪㪮㪚㪩㪪㪉㪲㪻㪙㪴

-100

-50 0 50 100

㪫㪜㪤㪧㪜㪩㪘㪫㪬㪩 㪜㩷㪲㷄㪴

Fig12. MUTE Attenuation

-95

㪘㪪㪮㩷㪚㪩㪦㪪㪪㪫㪘㪣㪢㩷㪑㩷㪝

-100

-50 0 50 100

㪫㪜㪤㪧㪜㪩㪘㪫㪬㪩㪜㩷 㪲㷄㪴

Fig13. ASW Crosstalk

٨Cautions on use

1. Numbers and data in entries are repr esentative design values and are 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
circuits 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 operating temperature 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 implemented when using
the IC at times where the absolute maximum ratings may be exceeded.

4. -5V pin potential

Ensure a minimum -5V pin potential in all operating conditi ons. Make sure that no pins are at a voltage below the -5V
pin at any time, regardless of whether it is a transient signal or not. <GND=0V>

5. Thermal design

Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd)
in actual states of use.

6. Short circuit between terminals and erroneous mounting

Pay attention to the assembly direction of the ICs. Wrong mounting direction 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. Supply voltage

Although basic circuit function is guaranteed under normal voltage operation (5V: ±4.5㨪5.5V, 12V: 11.5㨪12.5V),
ensure each parameter complies with appropriate electrical characteristics, when using th is device.

9. The application circuitry example

SW and FS output are controlled by BD3825FS which in turn is controlled by BH7624KS2 and therefore, BD38 25FS
and BH7624KS2 should be used in conjunction. Pins 18 and 24 should be pulled down by 10kȍ resistor. Pins 1, 2, 6,
7, 10, 12 must be controlled by the microcontroller when using BD3825FS on its own.

-95

㪚㪟㪘㪥㪥㪜㪣㩷㪚㪩㪦㪪㪪㪫㪘㪣㪢㪑㪝

-100

-50 0 50 100

㪫㪜㪤㪧㪜㪩㪘㪫㪬㪩㪜㩷 㪲㷄㪴

Fig14. Channel Crosstalk

7/8

㧔

y

p

p

Ͷ Selection of order type

B D

SSOP-A24

<Dimension>

7.8 ± 0.3

1.8 ± 0.1

5.4 ± 0.2

0.11

10.0 ± 0.2

24

1

0.8

13

12

0.36± 0.1

3

0.3Min.

0.15 ± 0.1

0.1

8

TYPE

BD3825FS

Unit:mm)

2

5

F

<<Tape and Reel information>

Tape
Quantit
Direction

of feed

Embossed carrier ta
2000

cs

E2

(Correct direction: 1pin of product should be at the upper left when you hold
reel on the left hand, and you pull out the tape on the right hand)

1234

1234

Reel

Orders are available in complete units only.

1234

S

1pin

E

2

Package, Foaming specification

e

1234

1234

Direction of feed

1234

1234

1234

The contents described herein are correct as of October, 2005
The contents described herein are subject to change without notice. For updates of the latest information, please contact and confirm with ROHM CO.,LTD.
Any part of this application note must not be duplicated or copied without our permission.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding
upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams and information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any
warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such
infringement, or arising from or connected with or related to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, implied right or license to practice or commercially exploit any intellectual property rights or other
proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer.
The products described herein utilize silicon as the main material.
The products described herein are not designed to be X ray proof.

Published by
Application Engineering Group

Catalog NO.05T398Be '05.10 ROHM C 2000 TSU

Appendix

Notes

No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.

The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.

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

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Appendix1-Rev2.0