NJM2188
- 1 -A
P R E L I M I N A R Y
Passive Matrix TruSurround
TM
3D Audio Processor
The TruSurround technology right incorporated in the NJM2188 are owned by SRS Labs, a U.S. Corporation and licensed to New
Japan Radio Co., Ltd. SRS is protected under U.S. and foreign patents issued and/or pending. TruSurround and the , are
trademarks of SRS Labs, Inc. in the United States and selected foreign countries. Neither the purchase of the NJM2188, nor the
corresponding sale of audio enhancement equipment conveys the right to sell commercialized recordings made with any TruSurround
technology.
SRS Labs requires that all users of the NJM2188 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:949-442-1070
Fax:949-852-1099
http://www.srslabs.com
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GENERAL DESCRIPTION
The NJM2188 is a Passive Matrix TruSurround
TM
3D
audio processor. It regenerates the full surround sound
field 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
encodes them into 2 channel surround signals again.
Accordingly any pre-processors decoding into 4
channel signals are not required.
The NJM2188 also includes the SRS 3D-STEREO,
and regenerates a 3D sound field from normal L/R input.
The NJM2188 is suitable for TV, mini component, CD
radio cassette, multimedia speaker system ,and others.
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FEATURES
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Operating Voltage
(4.7 to 13V)
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Maximum Input Voltage
(1.5Vrms typ. at V
+
11V)
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q
Low Output Noise
(32
Vrms typ. at TRU mode)
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q
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SRS 3D-STEREO FUNCTION (Two-grade Switch for 3D Effect)
q
q
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q
BYPASS FUNCTION
(THROUGH)
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Bipolar Technology
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Package Outline
DIP16, DMP16, SSOP16
NJM2188D NJM2188M
NJM2188V
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PACKAGE
NJM2188
- 2 -
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BLOCK DIAGRAM
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PIN CONFIGRATION
1
2
3
4
5
6
7
8
16
15
14
13
10
12
11
9
NJM2188
MODE 1
MODE 2
VREF
GND
V
+
Lch out
Rch out
Lch in
Rch in
FIL1_IN2
FIL1_IN1
FIL1_IN3
FIL1_OUT
No. Symbol
Function
1 MODE1
Mode
Switch
2 MODE2
Mode
Switch
3 V
+
Supply Voltage 4.5V to 13V
4 V
REF
V
+
/2 OUTPUT
5
FIL2_OUT
Perspective Network_2 output
6 FIL2_IN Perspective
Network_2
input
7 FIL2_IN2 Perspective
Network_2
input2
8 GND
Ground
9 R
ch OUT
R
ch
OUTPUT
10 L
ch OUT
L
ch
OUTPUT
11
FIL1_IN3
Perspective Network_1 INPUT3
12
FIL1_IN2
Perspective Network_1 INPUT2
13
FIL1_IN1
Perspective Network_1 INPUT1
14 FIL1_OUT
Perspective Network_1
OUTPUT
15 R
ch IN
R
ch
INPUT
16 L
ch IN
L
ch
INPUT
FIL2_OUT
FIL2_IN
FIL2_IN2
MIX
VREF
VREF
VREF
VREF
VREF
VREF
VREF
MIX
V+
SW Control
VREF
VREF
Rch in
SRS 3D-1
Lch in
SRS 3D1
Lch out
Rch out
TRU
SRS 3D-2
(SRS 3D)
(SRS 3D)
TRU
TRU
TRU
SW1
SW2
SW3
SW4
SW
1
SW
2
SW
3
SW
4
MO
D
E
1
MO
D
E
2
F
I
L1_OU
T
F
I
L1_IN
2
F
I
L1_IN
1
F
I
L1_IN
3
GND
VREF
V+
F
I
L2_OU
T
F
I
L2_IN
F
I
L2_IN
2
50K
50K
51K
150K
20K
15K
3.
9K
1K
5K
45K
50K
50K
12.5K
37.
5K
20K
50K
6.
18K
50K
BYPASS
BYPASS
SRS 3D-2
11K
NJM2188
- 3 -
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ABSOLUTE MAXIMUM RATING (Ta=25
C)
PARAMETER SYMBOL
RATING
UNIT
Supply Voltage
V
+
15 V
Power Dissipation
P
D
(DIP16) 500
(DMP16) 300
(SSOP16) 300
mW
Operating Temperature Range
T
opr
-40 to +85
C
Storage Temperature Range
T
stg
-40 to +125
C
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ELECTRICAL CHARACTERISTICS(V
+
=12V,Ta=25
C)
CONDITION
IN
PARAMETER SYMBOL
L
R
OUT MODE
MIN TYP MAX UNIT
Operating
Voltage
V
+
- - -
-
4.7 12.0 13.0 V
0 0 - BYPASS
0 0 -
TRU
Supply
Current
I
cc
No
Signal
0 0 - SRS
3D-1
- 9.0
13.5
mA
Reference
Voltage
V
REF
V
+
/2 -
-
-
-
5.5
6.0
6.5
V
V
IN
0 L
f=1kHz
THD=3%
0 V
IN
R
BYPASS
11.0
(3.55)
12.0
(3.98)
-
V
IN
0 L
4.5
(1.67)
6.5
(2.11)
-
V
IN
0 R
7.3
(2.32)
9.3
(2.92)
-
f=125Hz
THD=3%
V
IN
V
IN
L
TRU
3.9
(1.57)
5.9
(1.97)
-
V
IN
0 L
7.5
(2.37)
9.5
(3.0)
-
V
IN
0 R
7.3
(2.32)
9.3
(2.92)
-
f=125Hz
THD=3%
V
IN
V
IN
L
SRS3D-1
4.0
(1.58)
6.0
(2.0)
-
V
IN
0 L
7.5
(2.37)
9.5
(3.0)
-
V
IN
0 R
7.5
(2.37)
9.5
(3.0)
-
Maximum
Input
Voltage
V
INMAX
f=125Hz
THD=3%
V
IN
V
IN
L
SRS3D-2
4.5
(1.68)
6.5
(2.11)
-
dBV
(Vrms)
NJM2188
- 7 -
TOTAL HARMONIC DISTORTION vs. INPUT VOLTAGE
TRU MODE
0.0001
5
0.0002
0.0005
0.001
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
-30
+15
-25
-20
-15
-10
-5
+0
+5
+10
TOTAL HARMONIC DISTORTION vs. INPUT VOLTAGE
BYPASS MODE
a, b
INPUT LEVEL(dBV)
INPUT LEVEL(dBV)
a: Vin = 1kHz Lch
Vout = Lch
b: Vin = 1kHz Lch
Vout = Rch
V
+
=12V
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
-30
+15
-25
-20
-15
-10
-5
+0
+5
+10
a: Vin = 1kHz Lch
Vout = Lch
b: Vin = 1kHz Lch
Vout = Rch
V
+
=12V
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
-30
+15
-25
-20
-15
-10
-5
+0
+5
+10
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
-30
+15
-25
-20
-15
-10
-5
+0
+5
+10
INPUT LEVEL(dBV)
a: Vin = 1kHz Lch
Vout = Lch
b: Vin = 1kHz Lch
Vout = Rch
V
+
=12V
THD(
%)
TOTAL HARMONIC DISTORTION vs. INPUT VOLTAGE
SRS 3D-1 MODE
INPUT LEVEL(dBV)
a: Vin = 1kHz Lch
Vout = Lch
b: Vin = 1kHz Lch
Vout = Rch
V
+
=12V
THD(%)
TOTAL HARMONIC DISTORTION vs. INPUT VOLTAGE
SRS 3D-2 MODE
a
b
a
b
a
b
THD(%)
THD(%)
[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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