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NJM2181

PRELIMINARY

Passive Matrix TruSurround

TM

3D AUDIO PROCESSOR

s

GENERAL DESCRIPTION

The NJM2181 is a Passive Matrix TruSurround

TM

3D audio

processor. It regenerates the full surround soundfield directly

from any kinds of surround encoded stereo input (Lt/Rt)

signals.

After the internal passive matrix circuit decodes Lt/Rt signal

into 4 channel signals, the TruSurround virtualizer re-

encodes them into 2 channel surround signals. Accordingly

any pre-processors decoding into 4 channel signals are not

required.

The NJM2181 also includes SRS 3D Stereo and 3D Mono,

and regenerates a 3D sound field from either normal L/R

input or monoural input.

The NJM2181 is suitable for TV, mini component, CD radio

cassette, multimedia speaker system, and others.

sPACKAGE

OUTLINE

NJM2181L

NJM2181M

sFEATURES

q

Operating Voltage

q

Maximum input Voltage

q

Low Output Noise

q

BYPASS Gain

q

Passive Matrix TruSurround

q

SRS 3D Stereo & 3D Mono

q

BYPASS FUNCTION

q

Bipolar Technology

q

Package Outline

(4.7 to 13V)

(1.5Vrms typ. at TruSurround)

(32µVrms typ. at TruSurround)

(0dB typ.)

(Two-grade Switch for 3D Effect)

(Through)

SDIP24, DMP24

The SRS, TruSurround technology right incorporated in the NJM2181 are owned by SRS Labs, a U.S. Corporation and licensed to New

Japan Radio Co., Ltd. SRS, TruSurround is protected under U.S. and foreign patents issued and/or pending. SRS, TruSurround and

the

,are trademarks of SRS Labs, Inc. in the United States and selected foreign countries. Neither the purchase of the NJM2181, nor

the corresponding sale of audio enhancement equipment conveys the right to sell commercialized recordings made with any SRS

technology.

SRS Labs requires that all users of the NJM2181 must enter into a license agreement directly with SRS Labs if the royalty is not

included in the purchase price. SRS Labs also requires any users to comply with all rules and regulations as outlined in the SRS

Trademark Usage Manual.

For further information, please contact:

SRS Labs, Inc.

2909 Daimler Street. Santa Ana, CA 92705 USA

Tel:714-442-1070

Fax:714-852-1099

http://www.srslabs.com

-1-

NJM2181

sABSOLUTE

MAXIMUM RATING

(Ta=25ºC)

PARAMETER

Supply Voltage

Power Dissipation

Operating Temperature Range

Storage Temperature Range

SYMBOL

V

+

P

D

T

opr

T

stg

RATINGS

15

(SDIP24)

700

(DMP24)

700

-30 to +85

-40 to +125

UNIT

V

mW

ºC

sELECTRICAL

CHARACTERISTICS

(Ta=25ºC,V

+

=9V, V

IN

=-10dBV(316mVrms))

TEST CONDITION

PARAMETER

Operating Voltage

SYMBOL

INPUT

L

R

-

V

IN

-

V

IN

-

0

-

V

IN

-

V

IN

-

V

IN

-

V

IN

-

V

IN

-

V

IN

V

IN

V

IN

V

IN

-

V

IN

0

V

IN

-

V

IN

-

V

IN

-

V

IN

-

OUT

PUT

MODE

-

BYPASS

TRU

3D Stereo1

3D Mono

MIN.

4.7

TYP.

9.0

MAX.

13.0

UNIT

V

+

-

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

Supply Current

I

CC

No Signal

6.3

12.5

18.8

mA

Reference Voltage

V

REF

V

+

/2

f=1kHz

THD=3%

f=125Hz

THD=3%

f=125Hz

THD=3%

f=125Hz

THD=3%

f=1kHz

THD=3%

f=1kHz

L-R OUT

Rg=0Ω

A-Weighted

-

BYPASS

4.3

6.8

(2.2)

1.5

(1.2)

3.6

(1.5)

3.6

(1.5)

-7.6

(0.4)

-1.0

-

4.5

8.8

(2.8)

3.5

(1.5)

5.6

(1.9)

5.6

(1.9)

-3.0

(0.7)

0.0

-90

(31.6)

-90

(31.6)

-90

(31.6)

0.10

4.7

-

V

TRU

3D Stereo1

3D Stereo2

3D Mono

3D Stereo1

TRU

3D Stereo1

3D Mono

TRU

Maximum

Input Voltage

V

IM

dBV

(Vrms)

-

1.0

-85

(56.2)

-85

(56.2)

-85

(56.2)

dB

Channel Balance

CH

BAL

OutputNoise

Voltage

V

NOISE

Rg=0Ω

A-Weighted

dBV

(µVrms)

Rg=0Ω

A-Weighted

f=1kHz

Total

Harmonic

Distortion

THD

f=1kHz

Bypass Gain

G

VBYP

f=1kHz

3D Stereo1

%

3D Mono

BYPASS

-1.0

0.0

1.0

dB

-2-

NJM2181

sELECTRICAL

CHARACTERISTICS

(Ta=25ºC,V

+

=9V, V

IN

=-10dBV(316mVrms))

TEST CONDITION

PARAMETER

SYMBOL

INPUT

L

f=1kHz

SRS Gain

G

SRS

f=1kHz

Mode Select

Control Voltage

V

MODE

V

IN

-

V

IN

V

IN

-

V

IN

V

IN

-

V

IN

V

IN

V

IN

R

-

V

IN

V

IN

-

V

IN

V

IN

-

V

IN

V

IN

-

V

IN

V

IN

OUT

PUT

MODE

TRU

3D Stereo1

MIN.

TYP.

MAX.

UNIT

L

R

L

R

L

R

L

R

L

R

L

R

L

R

0.2

-13.5

-4.8

-15.0

-5.8

-21.0

1.3

-6.9

2.0

0.0

2.2

-11.5

-2.8

-13.0

-3.8

-19.0

3.3

-4.9

-

4.2

-9.5

-0.8

-11.0

-1.8

-17.0

5.3

-2.9

V

+

0.7

V

dB

3D Stereo1

3D Stereo2

3D Mono

Vin=High Level

Vin=Low Level

s

MODE SWITCH

MODE

BYPASS

TRU

3D Stereo1

3D Sterteo2

3D Mono

MODE1

L

H

MODE2

L

H

L

H

MODE3

-

L

H

-

-3-

NJM2181

sPIN

FUNCTION

1.FIL1

2.FIL2

3.FIL3

4.FIL4

5.FIL5

6.FIL6

7.FIL7

8FIL8

9.FIL9

10.MODE1

11.MODE2

12.MODE3

13 GND

14 VREFOUT

15 VREFIN

16 VCC

17 ROUT

18 LOUT

19 FIL10

20 FIL11

21 FIL12

22 FIL13

23 RIN

24 LIN

24

23

22

21

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

s

BLOCK DIAGRAM

FIL

13

22

FIL

12

21

FIL

11

20

FIL

10

19

VREF

IN

15

VREF

OUT

14

50K

INL

24

INR

23

OUTL OUTR

18

17

V+

16

GND

13

FILTER

EXTERNAL

50K

GND

VREF

EXTERNAL

FILTER

b

c

d

MATRIX

a

b

c

d

a

EXTERNAL

FILTER

MATRIX

1

FIL1

2

FIL2

3

FIL3

4

FIL4

5

FIL5

6

FIL6

7

FIL7

8

FIL8

9

10

11

12

FIL9 MODE MODE MODE

3

2

1

-4-

a:BYPASS

b:3D-STEREO

c:TruSurround

d:3D-MONO

90°

PHASE

NJM2181

sAPPLICATION

CIRCUIT

GND

10uF/35V

C21

Rch INPUT

Rch OUTPUT

Lch OUTPUT

Lch INPUT

GND

VREF

GND

100uF/25V

10uF/35V

C15

0.0047uF

C17

0.22uF

C18

0.22uF

10uF/35V

0.01uF

C20

C22

C16

100uF/25V

C19

10uF/35V

V+

12V

C14

C13

C12

3D-2

24

LIN

23

RIN

22

FIL13

21

FIL12

20

FIL11

19

FIL10

18

LOUT

17

ROUT

16

V+

15

VREFIN

14

VREFOUT

13

GND

10K

R10

3D-1

MODE3

10K

MODE2

NJM2181

MODE1

MODE2

MODE3

FIL3

FIL1

FIL2

FIL4

FIL5

FIL6

FIL7

FIL8

FIL9

R9

10K

MODE1

R8

1

2

3

4

5

6

7

8

9

10

11

12

GND

1.8K

R1

R3

C5

C6

C7

C4

0.1uF

C8

0.01uF

0.22uF

10uF/35V

C11

GND

2MEG

33K

R5

R4

75K

GND

0.0047uF

GND

1.5K

C2

0.0047uF

C1

0.01uF

VREF

51K

C3

R6

R7

10uF/35V

C10

10uF/35V

R2

0.0047uF

0.1uF

C9

[CAUTION]

The specifications on this databook are only

given for information , without any guarantee

as regards either mistakes or omissions. The

application circuits in this databook are

described only to show representative usages

of the product and not intended for the

guarantee or permission of any right including

the industrial rights.

-5-

NJM2181M

NJM2181M概述

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