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NJM2181
PRELIMINARY
Passive Matrix TruSurroundTM 3D AUDIO PROCESSOR
sGENERAL DESCRIPTION The NJM2181 is a Passive Matrix TruSurroundTM 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 reencodes 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) (32Vrms 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
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NJM2181
sABSOLUTE MAXIMUM RATING (Ta=25C) PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V+ PD Topr Tstg RATINGS 15 (SDIP24) 700 (DMP24) 700 -30 to +85 -40 to +125 UNIT V mW C C
sELECTRICAL CHARACTERISTICS (Ta=25C,V+=9V, VIN =-10dBV(316mVrms)) TEST CONDITION PARAMETER Operating Voltage
SYMBOL
INPUT L R VIN VIN 0 0 0 VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN 0 0 0 VIN VIN VIN VIN -
OUT PUT
MODE BYPASS TRU 3D Stereo1 3D Mono
MIN. 4.7
TYP. 9.0
MAX. 13.0
UNIT V
V
+
L R L R R L L R L R L R L R L R L R L R L R
Supply Current
ICC
No Signal
6.3
12.5
18.8
mA
Reference Voltage
VREF
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=0
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 0.10 0.10
4.7 -
V
TRU
3D Stereo1 3D Stereo2 3D Mono 3D Stereo1 TRU 3D Stereo1 3D Mono TRU
Maximum Input Voltage
VIM
dBV (Vrms)
1.0 -85 (56.2) -85 (56.2) -85 (56.2) dB
Channel Balance
CHBAL
OutputNoise Voltage
VNOISE
Rg=0
A-Weighted
dBV (Vrms)
Rg=0
A-Weighted
f=1kHz Total Harmonic Distortion THD f=1kHz f=1kHz Bypass Gain GVBYP f=1kHz
3D Stereo1
%
3D Mono
BYPASS
-1.0
0.0
1.0
dB
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NJM2181
sELECTRICAL CHARACTERISTICS (Ta=25C,V+=9V, VIN =-10dBV(316mVrms)) TEST CONDITION PARAMETER SYMBOL INPUT L f=1kHz f=1kHz f=1kHz SRS Gain GSRS f=1kHz f=1kHz f=1kHz f=1kHz Mode Select Control Voltage VMODE VIN VIN VIN VIN VIN VIN VIN VIN R VIN VIN VIN VIN VIN VIN VIN VIN
OUT PUT
MODE TRU 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 Stereo2
3D Mono
Vin=High Level Vin=Low Level
sMODE SWITCH MODE BYPASS TRU 3D Stereo1 3D Sterteo2 3D Mono MODE1 L L H H H MODE2 L H L L H MODE3 L H -
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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
sBLOCK 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 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
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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
GND
VREF
GND
GND
GND
100uF/25V
10uF/35V
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
GND GND 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.
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